recovery procedure for western region - srldc · starting of motor of power plant auxiliaries like...

Recovery Procedure for Western Region-Dec 2013 1

Power System Operation Corporation Ltd.

(A wholly owned subsidiary of Power Grid Corporation of India Ltd.) WESTERN REGIONAL LOAD DESPATCH CENTRE

F-3, MIDC Area, Marol, Andheri(E),

Mumbai- 400093.

Recovery Procedure

For

Western Region

December - 2013


TABLE OF CONTENTS

Chapter Title Page No.

1. Introduction .............................................................. 4

2. System restoration approaches and

General guidelines ........................................................... 6

3. Recovery Procedures –An overview .............................. 11

4. Restoration Procedures for Gujarat ................................. 22

Exhibits ....................................................................

5. Restoration Procedures for Madhya Pradesh............... 37

Exhibits ...............................................................

6. Restoration Procedures for Chhattisgarh.................... 52

Exhibits ................................................................

7. Restoration Procedures for Maharashtra ..................... 66

Exhibits ..................................................................

8. Restoration Procedures for Goa .................................. 87

9. Restoration Procedures for Total black out in

Western Region........................................................... 88

10. Training Drills and Exercises....................................... 95

11. Power Map of Western Region .................................... 97


ANNEXURES

Sl. No. Title Page No.

Annexure-I List of Generating Stations

With Black-start facilities ...……………………… 99

Annexure-II Minimum Survival/Auxiliary

Power Requirement of Generating Stations ………… 101

Annexure-III Sub-stations provided with

Synchronization facilities .…………………………. 104

Annexure-IV(a) Traction Substations in WR ........................................ 106

Annexure-IV(b) Power Supply to Traction Substations Format ……… 109

Annexure-IV(c) Power Supply Arrangement Diagram of SEBs to 110

Traction sub-stations (TSS) of Western Railway………

Annexure-IV (d) Power Supply Arrangement Diagram of SEBs to 111

Traction sub-stations (TSS) of South East Railway

(Nagpur Division) …………………………………

Annexure-V List of Bus/Tertiary Reactors .....................…………. 112

Annexure-VI Line Charging Guidelines During Restoration……….. 114

Annexure-VII Restoration Procedures for Tata Power system …….. 117

Annexure-VIII Monitoring Performance of Restoration Plans ..…….. 136

Annexure-IX(i) Report on Black Start Mock Drill at Indira Sagar 146

Hydro Power station

Annexure-IX(ii) Report on Black Start Mock Drill at Bargi 152

Hydro Power station

Annexure-IX(iii) Report on Black Start Mock Drill at SSP 157

Hydro Power station Annexure-IX(iv) Report on Black Start Mock Drill at Bango 160

Hydro Power station

Annexure-IX(v) Report on Black Start Mock Drill at Pench 165

Hydro Power station

Annexure-IX(vi) Report on Black Start Mock Drill at CCPP Vatva 171

Annexure-X Ready Reckoner on Reactive Power Management…… 173

Acknowledgement ………………………………………………………… 175

Bibliography ………………………………………………………… 176


CHAPTER – 1

1.1 INTRODUCTION

Western Regional Electrical Power Grid covers geographically the states of Maharashtra,

Gujarat, Madhya Pradesh, Chhattisgarh and Goa, union territories of Daman and Diu &

Dadra and Nagar Haveli. The central government companies primarily NTPC and NPC

Ltd. own and operate many power stations in the western grid. The inter state

transmission system is owned and operated by POWERGRID also declared as the

Central Transmission Utility (CTU) of India. The region also has a significant portion of

generation, transmission and distribution network belonging to the private sector.

1.2 SCOPE

This document describes the procedures to be followed / implemented by WRLDC,

SLDCs and other constituents of western region for the restoration of grid following a

system disturbance. This document has been prepared in consultation with regional

constituents. This document is being issued in pursuance to clause 5.8(b) of Revised

Indian Electricity Grid Code (IEGC-2010) and supersedes the existing document titled

'Black Start facilities in Western Region', issued in Jan 2012.

1.3 OBJECTIVE

The objective of Recovery Procedures is to achieve restoration of total system in the

shortest possible time, taking into account the generation securing (i.e., stabilization of

saved units), extension of start-up power to thermal and nuclear units, traction and other

essential loads, core sector industrial loads keeping in view of the generator capabilities

and the transmission constraints etc. and to achieve re-synchronization of the constituent

systems which have separated from each other as a result of the disturbance.

1.4 HIERARCHY OF RESPONSIBILITIES

WRLDC as the apex body in operation of the Western Regional Grid, supervises and

controls all the grid operations and ensures integrated operation of the regional grid. The

regional power system is operated as a loose power pool with ample autonomy to the

state utilities. The region has computerized Load Dispatch Centers at the regional level

(WRLDC) top of the hierarchy and State Load Dispatch Centers (SLDCs) & Area Load

Dispatch Centers (ALDCs) at the state level. The National Load Dispatch Centre

(NLDC), exercises supervision over WRLDC and the other four Regional Load Dispatch

Centres(RLDCs). While WRLDC is directly involved in the restoration of the central

sector transmission and generation, it directs, supervises and monitors the restoration of

the facilities owned by the states and coordinates the resynchronization/reintegration of

the islands that are restored around the generating units with black start facilities or

sources of power energized through inter regional interconnections. Restoration of the

loads is under the control of the state utilities and priorities are set by them. More the

number of sources, faster the restoration process. WRLDC would try to get emergency

assistance from the neighboring regions at the earliest to speed up restoration provided

no constraints are experienced in getting inter regional assistance. The RLDC is

authorized during the restoration process following a black out, to operate at reduced


security standards for voltage and frequency as necessary in order to achieve the fastest

possible recovery of the grid. (Section 5.8(d) of IEGC-2010).

1.5 DEFINITIONS OF THE IMPORTANT TERMS

Total System Black Out: The system is said to be under total black out when all

Regional utility generation has ceased to operate and there is no supply from external

interconnections to the (WR) grid and it is not possible for the total system to function

again without black start.

Partial System Black out: Blackout of a particular constituent system either partially or

fully or that of more than one constituents‟ systems is termed partial system blackout.

System Islanding: In case, part of the system gets separated from the grid due to system

splitting or through operation of any defense mechanism/scheme and operates

independently, the phenomenon is called System Islanding.

Normal System Conditions: System will be declared to be normal when all islands are

re-connected, all emergency and essential loads are restored and adequate transmission

system is restored enabling all the constituent states to draw their scheduled power from

ISGS.

1.6 CONTENTS: This document contains, inter alia, the following aspects:-

(i) Generation securing

(ii) Generation build-up

• Survival and Start-up Power of Power Plant(s).

• Power Station(s) with Black-start facility.

(iii) Build-up of islands

(iv) List of Units with black start facilities, inter-state/regional ties, synchronizing

points and essential loads to be restored on priority.

(iv) Detailed State/Utility-wise Restoration plans.

1.7 UPGRADATION

As per IEGC-2010(5.8.a), detailed plans and procedures for restoration of the regional

grid under partial/total blackout shall be developed by RLDC in consultation with all

regional constituents/RPC Secretariat and the same shall be reviewed / updated annually.

The important inputs required for revision shall include the performance of restoration

plans during previous grid disturbances and critical analysis of the shortfalls along with

recommendations/suggestions for future. Keeping this in view, Annexure -VIII has been

included with tables from I to VII. Some of the information concerns restoration plans

and the rest on actual experience of restoration. The constituents may fill up these tables

for inclusion in the next report. As per IEGC-2010 (5.8.b), detailed plans and procedures

for restoration after partial /total blackout of each Constituent‟s system within a region

will be finalized by the concerned constituent in coordination with the RLDC. The

procedure will be reviewed, confirmed and revised annually. Mock drills are to be

carried out by the constituents at least once every six months under intimation to the

RLDC.


CHAPTER – 2

SYSTEM RESTORATION APPROACHES

AND

GENERAL GUIDELINES

2.1 SYSTEM RESTORATION APPROACHES

Restoration of the system on black start is generally done through the following two

approaches:

1. Bottom-Up Approach -Systems with a fair dispersal of Generating units with black

start facilities:

Those generating stations, where black start facilities are available, should be started up

and islands be formed around them by connecting essential loads. These islands are then

interconnected at predefined locations where synchronizing facilities are available. The

speed of restoration enhances with increase in number of black start facilities and their

dispersal. Gujarat, Chhattisgarh, Madhya Pradesh and Maharashtra have considerable

number of generators with black start facilities and these should be utilized to the

maximum extent. It is required to carefully monitor the operations of the islands (before

re-integration with rest of the grid) due to small stiffness in islands. One well conversant

engineer must be specifically assigned at the SLDC level to monitor each island.

Utmost care should be taken, while adding loads, to ensure step-by-step addition,

keeping strict vigil of the load characteristics, i.e. variation of load with respect to

voltage and frequency and stiffness of the islands. During cold load pick up, sudden

starting of motor of power plant auxiliaries like BFP, ID & FD fans, pulverizing mills,

long conveyors etc., can cause voltage dips due to drawing of high starting currents.

Essential loads can be restored in steps smaller than 5 MW. While starting the power

station auxiliaries, it is preferable to start the largest motor first, if the startup sequence

permits. When the next largest motor is started, the running motor acts as an induction

generator and helps in controlling the starting current. Further, larger motors along with

their rotating loads may act as flywheel and prevent jerks to the generators. It is also

preferable to connect some radial loads to black started units before extending startup

power to other stations. It is also preferable to restore rotating type loads, which

contributes to inertia of the island. In all cases, load pick up should be restricted so as to

avoid frequency excursions by more than 0.5 Hz in the island.

2 Top-Down Approach -Systems with no / less generating units with black start

facilities:

The second approach could be followed in case self start facilities are available at only a

few power stations or the start up power has to be imported from neighboring

areas/regions at one or two points. In this case, the start up power is required to be

extended to all the generating stations on priority basis while restoring few loads and

transformers/reactors for voltage control. The start up power available from neighboring

regions at various interconnections has to be seriously explored since considerable


assistance can be availed and the restored system is likely to be connected to a stable

external system. These procedures are to be well planned for the earliest and quickest

harnessing of the facilities.

The restoration through this approach could be delayed due to problems in charging the

lines viz. high-voltage, lack of synchronizing facilities at certain substations etc. and

high probability of system disturbance during restoration. These guidelines are derived

from actual operational experience gained in Western Region. Great deal of care has to

be exercised while restoring the grid and the following guidelines must be kept in mind

while restoration of a collapsed system:-

(i) Reactive Power Balance

During early stages of the restoration process, it is of utmost importance to keep the

system voltage within the allowable range. This can be accomplished through the

following energizing the lower voltage lines with priority with well exercised plan by

energization of minimum number of lines to get maximum area covering, operating

generators at minimum voltage levels (at lagging pf.), switching off capacitor banks and

use of bus reactors, wherever available, using the line reactors as bus reactors wherever

provision is available, charging the shortest lines, charging transformers and taking

tertiary reactors in service, operating synchronous condensers, wherever feasible.

Charging of lines with series capacitors is to be avoided and filter-banks at HVDC

stations may be used for voltage control.

It may be kept in mind that in isolation, the fault level of the buses may reduce abruptly

and the effect of MVAR injection or absorption in a bus will be much more in increasing

or decreasing the voltage respectively than the normal condition which may damage

CVTs and LAs and further aggravating the problem.

(ii) Active Power Balance

This can be achieved by maintaining proper load generation balance by restoring

minimum and essential loads only, restoring load in small steps keeping in view the load

characteristics, by getting adequate inductive loading to compensate capacitive effect of

charging long high voltage lines and releasing concentrated load of large town/city along

with that of Railways. The major precautions in carrying out this step are:

(a) Load connected should preferably be balanced on all three phases.

(b) Bypassing the U/F relays initially until sufficient loads are connected and

frequency stabilizes and is maintained close to 50 Hz.

(c) Paying special attention for traction and other fluctuating loads.

(d) Power number, which is 2500-3000MW in the integrated N-E-W grid of above

1,00,000 MW, may come down to even below 50 MW in the isolated grid and any

addition or removal of even 5 – 10 MW may seriously affect the frequency and

stability of the system. Primary response from generating units becomes

particularly important at that time.

(e) Charging of any faulty line may cause tripping of the surviving generators.

(iii) Coordination and priorities

The main priorities are to restore power supply to the generating stations and load

dispatch centers, formation of self-sustaining islands around the generating stations for


which procedures are being laid down well in advance , to supply start up power to hydro

and gas units and finally for providing back up / survival / start up power to thermal and

nuclear units.

(iv) Communication and Real time data availability at control centres

It is most important to establish and maintain communication between RLDC, SLDCs,

generating stations and major substations if at all there is any disturbance in this area. All

important substations are to be kept in touch and links with less-important substations

may be cut off to avoid draining of batteries. All communication channels required for

restoration process shall be used for operational communication only, till grid-normalcy

is restored (IEGC-2010, sec- 5.8.e). General experience suggests that BSNL, MTNL and

private landline and mobile networks are useful alternatives to PLCC channel, especially

during disturbance. The contact numbers of all the concerned officials are to be

essentially maintained in the Control Rooms and updated regularly. Internet (e-mail) also

is to be used as a backup communication.

In case of non-availability / failing of battery backup, portable DG sets of suitable

capacity are to be arranged by the respective departments on priority to keep the

communication links operative. Apart from operating personnel at WRLDC/SLDCs

availability of personnel responsible for real time data and communication is also

important.

e) Protective Systems

The synchronizing facilities (of line / bus coupler) may not be available or may not be in

working condition at generating station or important substation(s) along the restoration

route. Hence the strategy should be modified accordingly. Problems in closing the

breaker due to low gas/air pressure or fault in closing/tripping circuit may cause delay in

restoration which may be sorted out suitably. Paralleling or interconnection of surviving

or restored islands through weak ties must be avoided. Faulty equipment / line, suspected

on the basis of physical observation, relay indications or any other related information

from site must not be energized. High voltage has to be controlled during restoration to

avoid damage of LAs, CVTs etc.

f) Survival Power

Availability of backup power supplies in the form of batteries, battery chargers, and DG

sets are to be ensured to avoid non-operation of circuit breakers, communication systems

etc., since this may cause unnecessary delay in restoration of the system.

g) Awareness of Restoration Plans

Training and necessary documentation is to be provided to all the system operators, load

dispatchers and concerned officials by respective LDCs.

h) Exchange of Information

Exchange of information among SLDCs and between NLDC, RLDC and SLDCs is

essential for proper co-ordination.


2.2 OPERATIONAL GUIDELINES.

(i) Each SLDC of Western Region will coordinate synchronization of units and

transmission lines in its system in consultation with WRLDC. For ISGS power

stations, WRLDC will be coordinating for their synchronization. WRLDC will

coordinate interstate/ inter-regional startup power availability and also inter-

state/inter-regional synchronization of the system.

(ii) Priorities for usage of Black start generation are as under:-

a) Providing startup power to hot units

b) Providing startup power to units that are cool, but capable of rapid restart

like hydro and gas units.

c) Restoring station auxiliary service to generating stations and substations.

d) Picking up essential loads.

(iii) Transmission corridors being used for startup power should be isolated from any

damaged/faulty equipment and should be of minimum length and minimum voltage

level to avoid excess line charging VAR and consequent voltage rise.

(iv) The constituent receiving assistance from neighboring area/region during restoration

process should restrict drawal to the agreed quantum of power only since exceeding

this quantity may have an adverse impact on the healthy system extending the

assistance and there by further deteriorating the condition.

2.3 GENERAL GUIDELINES

While each disturbance would be different and may require a different plan,

nevertheless, it would be useful to formulate general guidelines for the benefit of the load

dispatchers. These may be described as below:

i. The operators at generating stations and substations should have the training and

knowledge of planned synchronizing locations and synchronizing procedures.

ii. Switching procedures should be clearly laid down and periodically reviewed.

iii. Once disturbance occurs and dead bus situation comes in, all the circuit breakers

are to be opened except those specifically mentioned. Further action should be

started only after getting instruction from RLDC / SLDC.

iv The part systems should be reintegrated only after adequate stabilization.

v. The transformer taps should be checked for desired settings to minimize voltage

difference. Initially, it is advisable to be kept at the middle i.e. at tap position 9

for a transformer with typical 17 tap provision.

vi. The substation operators and load dispatchers should make a through scrutiny of

the capacitor banks and reactors in service and accordingly carry out the

switching operations for voltage control.


vii. Energizing long high voltage lines and cables should be avoided until adequate

generating capacity is available on bar.

viii. Provision of islanding schemes with varied strategies (viz. area-wise, power

station-wise and unit wise) would enable the operators to restore the system

faster. These provisions wherever available should be fully exploited.

ix. Provision of extending power supply to nuclear plants should be given top most

priority irrespective of cold or hot shutdown status of plant from safety

consideration.

x. In case of failure of main communication channels, guidelines for decision-

making should be given to all the major substations and generating stations.

xi. Developing of islands at power stations, wherever small units are available, could

help in faster restoration. One small unit at these power stations can be islanded

with radial loads and/or house load.

xii. Synchronization of the systems to be carefully done when the restoration is

carried out from two different sources.

xiii. DRs/SERs shall have to be provided at all the power stations and major sub-

stations. The outputs of these have to be made available to WRLDC.

xiv. No constituent shall refuse to extend start up power to other constituents(s) and

WRLDC directions should be complied with.

xv. Some of the generating units might have been saved due to successful islanding.

Stabilization of such surviving generation is of top most priority.

***


CHAPTER – 3

RECOVERY PROCEDURES –An Overview

3.1 INTRODUCTION

The following recovery procedures are laid down based on the operating experience

gained in restoration of the systems during major grid disturbances that took place in the

region in particular and other regions in general in the past few years. Multi scenario

approach has been adopted while formulating the restoration procedures. The various

scenarios are listed for each state.

3.2 Existing Black Start Facilities in Western Region

List of all power stations having black start facilities is enclosed at Annexure-1.

3.3 Requirement of survival power / auxiliary power

Survival power means the power needed for avoiding the damage to the equipment in

case of supply failure. This power is required for:

• Turbine emergency oil pump

• Jacking oil pumps

• Barring gear of the turbine

• Lubricating oil pumps

• Compressors for ABCB operation

• Emergency lighting

• Battery chargers of Units, Stations, Communication & Telemetry system.

• Ensuring cooling of nuclear reactor and its auxiliaries

The survival power required by a 120 MW unit is of the order of 250-350 kW while the

requirement of 210 MW unit is of the order of 350kW and for 500 MW unit, it is of the

order of 1250 kW – 1500 kW. As a general rule, the survival power requirement would

be around 0.25 – 0.30% of the unit capacity. Stand-by diesel generator (DG) sets are

normally available at all power stations to provide survival power. As leaving the

equipment safety entirely to these DG sets for an extended period of time is not

desirable, extending alternate sources of supply to a power station becomes important.

For ensuring long term cooling of reactor and its auxiliaries, and safe containment of

radio activity, nuclear units need “Off-site power” at the earliest. Therefore, top most

priority would be given to nuclear units.

3.4 Requirement of start-up power

The start-up power is the power required for the unit auxiliaries for restoration of the

generating unit. The requirement of start-up power by various units is as follows:-

Thermal Units: 7 to 8% of the unit capacity.

Nuclear units: 10% of the unit capacity


Hydro Units: 0.5 to 1% of the unit capacity.

Gas Units : 1.5 to 2% of the unit capacity.

The start up power requirement for starting the thermal unit is considerably high as the

major auxiliaries like Boiler Feed Pump (BFP), Induced Draft (ID) Fan, FD (Forced

Draft) Fan, Cooling Water (CW) Pumps etc., are of bigger size and the starting torque is

considerably high. In case of hydro units, the requirement of start-up power is not

significant as there are very few auxiliaries. The details of minimum survival / auxiliary

power required for the power stations in Western Region along with the capacity of

Diesel sets wherever installed are indicated at Annexure-2.

3.5 Synchronizing facilities at power stations / major sub-stations

The generating stations and major sub-stations having synchronizing facilities are

indicated in Annexure-3. For minimizing the time for restoration, it is imperative that all

lines of all the substations should be equipped with the synchronizing facilities in proper

working condition.

3.6 Supply to traction loads

(i) Constituent-wise priorities of load which are to be connected in steps should be

well documented and while restoring loads, essential loads such as railway

traction loads, underground coal mines/deep gassy mines, Air Port, TV station,

Telephone exchange, hospital, pumping stations etc., should be given priority

depending on available generation on bar.

(ii) Prior coordination with Railways is to be done to co-ordinate shifting of loads

between two Railway feeding points.

(iii) While extending power supply to the traction network during the system

restoration process, phase balancing should be kept in mind. Also the quantum of

actual load released from the sub-station should be known before the process of

restoration.

(iv) Railways should ensure that power supply should be used for only mobilizing the

rakes held up in between stations.

(v) Negative phase sequence currents, unbalanced voltages should be monitored to

avoid untoward incidents.

(vi) While releasing supply to traction some urban/city loads (inductive) should also

be simultaneously released so as to check the high voltages, jerks and

unbalancing.

(vii) Details of traction sub-stations in Western Region are enclosed at Annexure-

4(a).

(viii) The traction requirements have to be furnished by the constituents as per the

format enclosed at Annexure-4(b).


3.7 Bus reactors

List of Bus reactors available in the Western Grid are enclosed in Annexure-5.

3.8 Line Charging Guidelines

Guidelines for charging lines are enclosed at Annexure-6.

3.9 Start up power from Non Utility Generators (Captive & IPP)

Maharashtra : At present, non utility / captive power plants are not in a position to

supply start-up power as their capacity is small and it is either completely used for their

own system or in most cases it is not feasible to be extended to other power stations.

Chhattisgarh : M/s. BALCO have agreed for supply of 10 MW power to cater to the

survival power requirement of units at Korba (E) for about one hour duration. No other

non-utility sector /captive power plant is able to supply start up / survival power.

Gujarat: Black start facilities are available in GIPCL, CLPIPL, and AECo. And Sugen

(Torrent) Power stations located near Vadodara, Bharuch, Ahmedabad and Surat

respectively.

• Islanding scheme is available for all the units at GIPCL power station.

• In the event of failure of islanding scheme, the units can be started through the D.G sets

available. The time taken would be of the order of 40 minutes. It was informed by

GIPCL that the gas at required pressure is available directly from the gas fields. As such,

further compression / pumping are not needed. Hence, even in the event of power supply

failure to the gas fields, the gas is readily available in the usable form at the power

station up to 12 hours.

Madhya Pradesh: Non-utility / CPPs are not having start-up power facility.

Goa: Reliance Power station at Sancole (48 MW) is the only generating unit in Goa.

Details of black start capability of the units are not available.

3.10 RESTORATION PROCEDURES

The black start/restoration procedures to be adopted depend upon the gravity of the grid

disturbance and the sources from where the startup power could be

expeditiously provided. Different approaches and procedures will be needed to be

adopted in case the whole grid is affected by the disturbance or the disturbance is

restricted to a limited area. The following black start procedures are laid down based on

the operating experience gained in restoration of the systems during major grid

disturbances that took place in the region in the past few years. Multi-scenario approach

has been adopted while formulating the restoration procedures. The various scenarios for

each state and region as a whole are listed below:-


3.10.1 RESTORATION PROCEDURES FOR GUJARAT SYSTEM

To facilitate black start, D.G. sets are available in Gujarat System as mentioned below:

Sl. No. Power station Fuel Type DG set capacity

1 Ukai Hydro 500kVA

2 Mini hydro Hydro 50kW

3 Kadana Hydro 500kVA

4 Dhuvaran Gas/Thermal 2x1600kVA+700kVA

5 CCPP Vatva Gas 500kVA

6 CCPP Vatva Thermal Unit C:125kVA and Unit D,E,F:500kVA

each(Unit C islands during disturbance )

7 Kawas Gas 2850 kW

8 Gandhar Gas 2975 kW

9 GIPCL-II Gas/Steam 500 kVA

10 CLPIPL(Earlier

called GPEC)

Thermal 3000 kVA

11 Sugen Gas 2x6000 kVA

12 SSP Hydro 2x1000 kVA

PROCEDURES:

Detailed restoration procedure for Gujarat system is given at Chapter 4. Exhibits showing the

schematic scenarios are also enclosed along with Chapter 4. The salient points covered are :

(i) Scenario # 1 : All existing black start facilities of the state are made use of.

(ii) Scenario # 2 : Black start facility is not available at any location and start up power is

availed from Maharashtra through 220 kV Nasik-Navsari D/C or 220 kV TAPS(1&2)-

Vapi or TAPS(1&2)-Bhilad feeders. Alternatively 400 kV Boisar(PG)-Vapi-Sugen path

can also be used for availing start up power from Maharashtra.

(iii) Scenario #3 : Black start facility is not available at any location and start up power is

availed from M.P through 400 kV Indore-Asoj-Wanakbori or 400 kV Indore-Asoj-Ukai

paths.

3.10.2 RESTORATION PROCEDURES FOR M.P SYSTEM

To facilitate black start, D.G sets are available in M.P system as mentioned below:

Sl. No. Power station Fuel Type DG_set capacity

1 Indira Sagar Hydro 2x1000 kVA

2 Omkareshwar Hydro 2x1010 kVA

3 Bansagar Stage-I Hydro 250 kVA

4 Pench Hydro 250 kVA

5 Gandhisagar Hydro 100 kVA

6 Bargi Hydro 250 kVA

7 Bansagar Stage -III Hydro 250 kVA

8 Medikheda Hydro 250 kVA

9 Rajghat Hydro 250 kVA

10 Birsinghpur Hydro 220 Volt Battery


Black start facility is available at Gandhi Sagar generating station, but due to the remote location

of this station and the requirement of charging long lines to extend the start up power to other

generating stations and inability of the machines to absorb reactive power while charging long

lines, these machines would not be available practically for providing black start facility.

Similarly, black start facility of Birsinghpur hydel station is not very reliable. Start up power

from Rajghat station also cannot be extended to thermal power stations as the hydro units are

small and cannot handle high starting current while energizing thermal auxiliaries. These plants,

thus, can be used to form small islands around them and act as a base for grid formation and

supplying emergency power to the nearest areas.

PROCEDURES

Detailed Restoration procedures for MP System are given at Chapter 5. Exhibits showing the

schematic scenarios are also enclosed along with Chapter 5. Possible scenarios are given below:

(i) Scenario # 1: Availing start up power from own black start sources.

(ii) Scenario # 2: Availing start up power from Chhattisgarh via Korba(W)-Kotmikala-

Amarkantak or 132 kV Dongargarh-Balaghat-Seoni-Pench path or through 400 kV

Bhilai-Seoni path.

(iii) Scenario # 3 : Availing start up power from Gujarat via 400kV Asoj-Indore-Burwaha

(220kV) - Itarsi- Satpura path or 400 kV SSP-Rajgarh-Nagda-Indira Sagar path.

(iv) Scenario # 4: Availing start up power from Maharashtra via 132 kV Kanhan-Pench

path or through Khaparkheda-Kalmeswar-Pandurna-Satpura path.

(v) Scenario # 5: Availing start up power from NR via 132 kV Rihand-Singrauli-

Vindhyachal or using 400 kV AC bypass link at Vindhyachal or through 132 kV Anpara-

Morwa-Amarkantak or by 132 kV R P Sagar -Gandhi Sagar lines or by 220 kV Auraiya-

Malanpur and Auraiya-Mehgaon lines.

3.10.3 RESTORATION PROCEDURES FOR CHHATTISGARH SYSTEM

Black start facilities are available at Hydro stations at Hasdeo Bango (250kVA DG Set).

PROCEDURES:

Detailed Restoration procedures for Chhatisgarh system are given at Chapter 6. Exhibits

showing the schematic scenarios are also enclosed along with Chapter 6. The possible scenarios

are as enumerated below:

Scenario # 1 : Availing start up power from own black start sources i.e. Hasdeo Bango hydro

power station.

Scenario # 2 : Availing start up power from Madhya Pradesh through 220 kV Amarkantak-

Kotmikala-Korba(W) or through 220 kV Amarkantak-Manendragarh-Bango or through 400 kV

KSTPS-Korba(W) S/C line.

Scenario # 3 : Availing start up power from Eastern Region through 220 kV Budhipadar-

Korba(E) path or through 400 kV Rourkela-Raigarh path.


3.10.4 RESTORATION PROCEDURES FOR MAHARASHTRA SYSTEM

To facilitate black start, D.G. sets are available in Maharashtra System as mentioned below:

MAHARASHTRA:


1 Koyna I and II Hydro 2-MVA

house generator

2 KDPH Hydro 310 kVA

3 Eldari Hydro 6 kW

4 Ghatghar Hydro 1250 kVA

TATA POWER COMPANY (TPC):


1 Khopoli Hydro

2 Bhivpuri Hydro

3 Bhira Hydro 500 kVA

4 Bhira PSS Hydro 500 kVA

5 Trombay-7 Gas 2.5 MW

Action to provide black start facilities (DG set) at Koyna-IV may be initiated.

The following scenarios are considered.

Scenario # 1 : From own Black Start Facilities

Black start facilities at Koyna (Hydro) and Tata (Hydro) power stations are utilized.

Scenario # 2 : From Gujarat The black start facilities are not available and start up power is available from Gujarat through

220kV Vapi(G)-TAPS(1&2) and Bhilad-TAPS(1&2) lines and 220kV Navsari-Nasik D/C lines.

Power can also be received on 400 kV Vapi - Boisar line.

Scenario # 3 : From Madhya Pradesh

The black start facilities are not available and start up power is available from M.P grid through

220kV Pandurna-Kalmeshwar S/C line and 132kV Pench-Kanhan D/C lines.

Scenario # 4 : From Southern Region

The black start facilities are not available and start up power is available from Karnataka and

A.P of Southern Region through 220kV Chikodi- Kolhapur D/C lines and AC bypass link at

HVDC Bhadravati from SR.

Detailed Restoration procedures are given at Chapter 7. Exhibits showing the schematic

scenarios are enclosed along with Chapter 7.


3.10.5 RECOVERY PROCEDURES IN TPC SYSTEM

Scenario # 1

In case of survival of Mumbai system through the islanding scheme for Mumbai area, TPC

system would be in a position to extend start up power to the power stations in Western

Maharashtra. In the event of failure of the islanding scheme, the hydro units would island at 45

Hz. The hydro units, two sets at Khapoli and three sets at Bhivpuri are equipped with black start

facilities in addition to the sets at Bhira and GT at Trombay. These hydro stations can be used

for black start requirements.

Scenario # 2

In the event of failure of the hydro islanding scheme of TPC and problems in black starting the

above units, TPC could avail start up power assistance from Maharashtra at the three tie points

of Borivali, Trombay and Kalwa interconnecting TPC and Maharashtra systems in Western

Maharashtra. Guidelines have been laid down and are in force for restoring the consumer loads

in Mumbai area. Detailed black start procedures for restoration of the generating stations as well

7as complete restoration of the lines and consumer loads is discussed at Annexure-7.

As a special case considering the importance of Mumbai city, the procedure for restoration of

the lines and consumer loads in Mumbai has also been dealt with separately. It would be of

utmost importance to resume city loads in Mumbai as early as possible to avoid loss of industrial

production and other law and order problems.

3.10.6 TOTAL WESTERN REGION

In case of total blackout in Western Region, assistance could be availed from neighbouring

regions in addition to utilization of black start facilities within the region. The scenarios for

availing black-start facilities within the region have been discussed in cases of restoration of

individual constituent‟s systems. The various possibilities of availing start-up power from

outside sources are described below.

Scenario # 1 Availing start-up power from NR through any of the following paths -

(a) 400kV AC bypass link at HVDC Vindhyachal substation.

(b) 132 kV Anpara-Morwa-Amarkantak

(c) 132 kV R.P. Sagar- Gandhi Sagar lines

(d) 220 kV Kota-Badod or Modak-Badod lines

(e) 220 kV Auraiya-Malanpur or Auraiya-Mehgaon lines

(f) 400 kV Bhinmal- Zerda or Kankroli- Zerda lines

(g) 400 kV Agra- Gwalior D/C

Scenario # 2 Availing start-up power from SR through 400kV Ramagundam-Bhadrawati lines

and 400 kV AC bypass link at HVDC Bhadrawati substation. 220 kV Chikodi- Kolhapur D/C

can also be used to avail start-up power from SR.

Scenario # 3 Availing start-up power from ER through any of the following paths-

(a)220 kV Budhipadar-Korba(E) D/C and Budhipadar-Raigarh S/C lines.

(b)400 kV Rourkela-Raigarh D/C lines.

(c)400 kV Ranchi-Sipat D/C lines.


Detailed Restoration procedures are given at Chapter 9. Exhibits showing the schematic

scenarios are enclosed along with Chapter 9.

3.11 PRESENT CONSTRAINTS AND ACTIONS TO BE TAKEN TO OVERCOME

THE SAME.

Various constraints in the previous document for Recovery Procedures were discussed in past

and the following suggestions emerged:

1. Since Sikka station is located remotely, it would be difficult to extend startup power over

long distances till the rest of the Gujarat grid stabilizes. This would cause delay in

restoration of units at this power station. To speed up restoration, islanding scheme could

be designed for Sikka. Sikka units can be islanded either with Bhatia or Jamnagar.

Further, synchronizing facilities need to be provided at 220kV Anjar and Jamnagar to

facilitate integration of Sikka and Panandro with the rest of the grid in case of islanding

of these power stations. The islanding scheme for Sikka was dropped due to constraints

in opening of number of lines.

2. 220 kV Satpura-Kalmeshwar S/C line is made LILO at Pandurna and is in service and

this line would facilitate in extending start up power to Satpura, Khaperkheda, Koradi

power stations as well as to Pench HEP if required. This line helped in reducing the

problems faced while extending power from Pench units.

3. 220kV Ujjain-Badod-Modak and Ujjain-Badod-Kota lines are brought into service and

can be used for extending black start power to and from Rajasthan(NR) whenever

required. This would help in extending start up power upto Satpura power station

through 220kV Ujjain – Barwaha – Itarsi - Satpura D/C path. By simultaneously running

Gandhisagar hydro units, start up power can also be extended through 132 kV Gandhi

Sagar- Garoth– Badod-Ujjain – Makshi-Shujalpur – Shajapur – Bhopal – Itarsi –

Satpura. This was successfully used earlier after the grid disturbance on 30.07.2002.

4. The existing islanding scheme for Panandro is now kept out of service. This scheme

requires review as Akrimota power station is in close vicinity of Panandro.

5. Out of the several islanding schemes proposed in the existing recovery procedures, some

of the schemes were discussed and finalized by the islanding subcommittee. Out of these,

scheme for Uran was already implemented while islanding scheme for Bhusawal was

dropped. The islanding scheme for Korba(E) was approved by the islanding sub-

committee and is to be implemented. The islanding scheme for Nasik and Tarapur

stations were under finalization.

6. Out of the Islanding schemes using radial load at power stations as proposed in the

existing recovery procedures, islanding schemes for Amarkantak power station was

cleared by the islanding sub committee and is yet to be implemented. However, islanding

scheme for Satpura was dropped and the islanding scheme for Parli would be discussed

in the next meeting of islanding subcommittee.

7. There is no need to provide black start facilities at Vaitarna, Bhira TR and Tillari power

stations.


8. No D.G set or battery is available at SGTPS, Korba (W), Korba (E) etc. to supply

survival power. The constituents were requested to inform the availability of DG sets.

9. The MPPTCL representatives confirmed that the second 63 MVA, 220/132 kV ICT at

Amarkantak was taken back into service and at present both 2x63 MVA ICTs are in

service.

10. Tripping of breakers by the operators at all the dead buses takes time and delays

restoration process. This could be done automatically using under voltage/no voltage

relays.

11. All the constituents should fix up targets (time required for restoration) for various

activities and this could be compared with the actual time taken during restoration so as

to understand the reasons for delays. The NTPC representative stated that the problem of

delay in restoration due to puncturing of LP turbine diaphragms was examined at their

end. Earlier it used to take 8 hours for replacement of diaphragms and now the same can

be done in 3-4 hours due to some modifications works done by NTPC. It was suggested

that the representatives from power station of the constituents would interact with NTPC

on the above and spare diaphragms should be made available at all the power stations.

13. Field tests to be conducted to study the feasibility of using one unit at Pench for

restoration of Maharashtra system and the other unit for restoration of M.P system.

Khaperkheda & Koradi power stations should be able to get start-up power from Pench

without any difficulties.

14. Some of the islands during restoration might collapse due to tripping of units or load

restoration in large amounts compared to response rate of units or frequency prior to pick

up of loads being too low (below 49 Hz) etc.. If the islands are built around gas based

power plants, a constraint might arise in respect of restriction on multiple start-up and

shutdowns. Documentation of number of startups and shutdowns, load and duration

between two startups for emergency conditions is essential. The constituents may furnish

this information for inclusion in the Recovery Procedures.

15. On 30.7.2002 occurrence, problems with some DG sets were observed. Healthiness of

DG sets has to be ensured through weekly trial runs.

16. Field trials in the form of Mock Drill on all the black start facility generating stations are

planned to done on regular basis. As on date Nine Balckstart mockdrill has been

completed in Western region out of which Details of the Moackdrill at ISP, Bargi, SSP,

Bango, Pench and CCPP Vatva are included in Annexure-IX.

17. 220kV Kolhapur-Chikkodi D/C lines between WR & SR grids are now in service and in

healthy condition and can be used for black start.

18. Field trials are to be conducted to overcome the hunting problem faced by Bargi and

Pench. The following procedure was agreed upon:

(i) By starting one unit keeping AVR out of service keeping the excitation around 0.85 pu

(as low as possible). AVR to be taken into service only after the machine is loaded upto

10% to 15% at frequency around 50 Hz.


(ii) At the remote end, one transformer with load of around 10% capacity of the machine (i.e

5 MW for Bargi machines or 7 MW for Pench machines) is to be kept closed so that if

the line is charged, the load immediately comes on the machine. It is generally found that

hydro machines have good response rates.

(iii) It is to be observed if any hunting occurs in active power, voltage or reactive

power. If no hunting is observed, the AVR is to be taken into service. If hunting is

still observed more load is to be added at the remote end (i.e Jabalpur for Bargi

units and Kanhan/Seoni for Pench units) tills the hunting stops and then the AVR is

to be taken in auto mode. As the load is picked up on the machine, the excitation

should be increased gradually.

iv) With AVR in service throughout, it can be tested whether hunting occurs as it is

suspected that the hunting occurs mainly due to activation of exciter modes. The

response rates of the machines are also to be tested by recording frequency change for

different load increments. The observation on MW/Hz to be recorded. The response rates

should be recorded as below:-

Sl No Initial M/c Loading

(MW)

Load Increment in

MW (preferably @

5% steps)

Change in

frequency (Hz)

Response

MW/Hz

1

2

3

4

19. Updates are constantly required from the experience of the past grid disturbances. It has

been decided after discussions with the constituents that the recovery procedures has to

be updated based on experience gained from each of the grid disturbance. It was agreed

that after a grid disturbance, all the constituents shall report to WRLDC/WRPC the

restoration process adopted in detail along with the formats enclosed at Annex-VIII and

thereafter a meeting will be arranged along with the following OCCM to discuss the

difficulties faced in restoration and to suggest measures to improve the restoration

performance. It is stressed that updating of recovery procedures should be a continuous

ongoing activity and the constituents would provide suggestions and updates on a

continuous basis so that WRLDC can consider the information while updating the

recovery procedures as per the provisions in Grid Code.

20. Review of facilities and new units/transmission lines commissioning:-

A new hydro station of 2x125 MW has been commissioned at Ghatgar near Igatpuri.

This sub-station could ideally provide start up power to Nasik. The details of evacuation

facilities from Ghatgar shall be provided by MSETCL to identify the start up paths. One

black start DG set of 1250kVA is available at Ghatghar to provide start up power to the

units. To overcome high voltage problems during the black start process it is considered

worthwhile to provide facilities to run the hydro units in synchronous condenser mode. It

was therefore recommended that the up-coming hydro projects should have the facility to

operate in synchronous condenser mode. It was informed that synchronous condenser

mode of operation is proposed to be provided for Omkareshwar hydro units. The

information regarding Maheshwar hydro power station would be furnished by MPPTCL

with the necessary details.


21. SSP units are already being used in synchronous condenser mode and one / two

machine(s) may be used during the initial start up for charging and connecting suitable

and sustainable load in addition to house and local loads through a line.

22. The Detailed Recovery Procedure for new plants viz. Sipat, Jindal, Lanco, NSPCL,

Jaigad, Wardha Power, Essar (Mahan), ACBL, Balco etc. are to be prepared in priority.

23. The Black Start facilities to be extended by new gas plants like RGPPL, Sugen etc. are to

be worked out in details. RGPPL has recently procured a black start generator in the form

of a gas turbine of 35 MW capacity which can be started with both gas & liquid fuel. The

turbine is under testing and soon will be ready as a black start source for the generationg

station.

***


CHAPTER – 4

RESTORATION PROCEDURES

FOR

GUJARAT SYSTEM

4.1 INTRODUCTION

In case of total Black out in Gujarat power system, the following possible scenarios are

recommended for restoration of the supply in the state based on black start facilities available in

the state and sources of power available from outside the state. Enclosed Exhibits show the

schematic diagrams for scenarios and restoration plans based on island approach.

4.2 SCENARIOS OF BLACK START AT GUJARAT

4.2.1 SCENARIO # 1: FROM OWN BLACK START SOURCES

A. Kawas Gas Power Station (NTPC) (4 X 106 MW (GT) + 2 x 116 MW (ST))

(i) Kawas gas power station is equipped with DG sets adding to 2.85 MW capacity.

The auxiliary power requirement is 2.5MW for one GT.

(ii) The DG set cuts in automatically with black out and synchronizes to 6.6kV bus within 30

seconds.

(iii) The availability of DG set is being checked weekly by synchronizing with 6.6kV and

running the DG set for half an hour.

(iv) Kawas is having synchronizing facilities for units as well as lines.

(v) After auxiliary power is made available, the GTs can come up and deliver power to

220kV bus within half an hour.

(vi) In normal case with proper communication between Kawas and Ichhapur, 220kV

Kawas-Ichhapur S/C shall be charged and load is provided to Kawas units

commensurate with ramp up and response rate requirements of the GTs. The loads

of ONGC and GAIL, Hazira to be restored on priority to maintain gas pressure of

HBJ pipeline.

(vii) The preference for extending power from Kawas is Ichhapur, Navsari and Vav in that

order under normal restoration. However, in case of any problem between Kawas &

Ichhapur or in case of total failure of supply at Tarapur, 220kV Kawas-Navsari line may

be charged instead of 220kV Kawas-Ichhapur S/C line so that off-site power to Tarapur

can be extended. In case of problems in extending power supply to Ichhapur and

Navsari, extension to Vav can be considered.

(viii) SLDC, Gujarat shall instruct Ichhapur sub-station and Kawas sub-station to make

available suitable load in small increments and not to connect excess load as the units


may trip. Gujarat shall initially connect 220kV/66kV and then 66/11kV transformers

without any load on their secondary. Further, the 11kV feeders shall be switched ON one

by one in steps of 2 MW each. The loading rate shall not exceed 7.2 MW per minute. In

case Gujarat requires to extend start up power to another power station, Kawas units on

bar shall preferably be loaded upto 50% of their capacity. The exact loading rates – ramp

up/ramp down in MW per minute and response rates in MW/Hz shall be informed by

NTPC.

(ix) If frequency is less than 49.5 Hz, load should not be connected and in case frequency is

greater than 50.2 Hz, load should not be disconnected and restoration of loads shall be in

small steps such that the frequency change is not more than 0.5 Hz.

(x) 220 kV Ichhapur - Vav line is to be charged in consultation with Kawas and start up

power is to be fed to Utran CCPP through 66 kV Vav - Utran line to start generation of

Utran and release supply to essential services like Railways and essential loads of Surat

city through 66 kV Vav - Bhestan lines.

(xi) One circuit of 220 kV Vav-Kakrapar D/C (43km) line is to be charged to feed survival

power to Kakrapar Nuclear Power Station. In case of no power available at Vav, this

power can be availed from Ukai(Th.) by charging 220 kV Vav - Kakrapar - Ukai (Th)- 1

(Teed line) (63 KM) to feed survival power to Kakrapar.

(xii) By Charging 220 kV Vav - Kim - Zagadia - Haldarwa line and feeding start up power to

Jhanor, CLPIPL & GSEG more and more generation to the growing up network can be

availed.

(xiii) Extend power available at Halderwa to Jambua via 132 kV Haldarwa - Karjan - Jambua

(56 KM) line and there after charge 220 kV Haldarwa - Jambua line. Supply power to

Railways and Vadodara city.

(xiv) Extend start up power to GIPCL if required or if generation is available at GIPCL due to

islanding, synchronise it at Jambua and get more generation.

(xv) The available power at Jambua may be extended to Dhuvaran and Wanakbori.

(xvi) In case of failure of DG to start, start up power to Kawas to be extended as per the

procedures under sec 4.2.2 & 4.2.3.

B. Jhanor CCPP (144MW X 3 GTs+225 MW ST)

Selecting the gas turbine first to be started as per following preferences:-

a) GT-1 or GT-3 when all three gas turbines/ only GT-1 & GT-3 are available

b) GT-1, when GT-1 & GT-2 are available

c) GT-3, when GT-2 & GT-3 are available.

The actions may be initiated as described below:

(i) Start 2975 kW DG set to feed start up power to the GT unit to be started. After start up of

one of the GT unit, station load to be put on operating gas turbine.

(ii) Isolate both 220kV buses by opening all feeders connected to them.


(iii) Start another gas turbine.

(iv) One of the 220kV buses is to be charged as per existing condition and convenience.

(v) One of the 220kV Jhanor-Haldarwa D/C lines (13km each) is to be charged through one

gas turbine which is not connected to station load, in consultation with Haldarwa sub-

station.

(vi) Then build up load upto 50 MW at Haldarwa sub-station in consultation with SLDC

Jambua, WRLDC and NTPC-Jhanor as per approved procedure of loading within

capability of gas turbine at a rate of 7.2 MW/min. Power supply to Bharuch town,

Railways and ONGC Gandhar gas fields (to maintain adequate gas pressure)has to be

extended on priority basis. Loading procedure is to be drawn by SLDC,Gujarat in

consultation with WRLDC and NTPC.

(vii) Start up power to CLPIPL to be extended through 220kV Haldarwa-CLPIPL line.

However, charging 400 kV Jhanor-CLPIPL line may not be feasible till sufficient load

(approx.50MW) is available on the unit as it requires charging through ICT.

(viii) 132 kV Haldarwa - Karjan - Jambua line (56 Kms) is to be charged to feed Railways and

Vadodara city.

(ix) 220 kV Haldarwa - Jambua line to be charged and power available at Jambua to be

extended to GIPCL, Dhuvaran and Wanakbori.

(x) After checking the generation capacity available at Jhanor, CLPIPL and GIPCL, extend

start up power to Kadana (Hydro), AECo and Gandhinagar to start generation.

(xi) By charging 220 kV Haldarwa - Kawas line (81 Kms) start up power to Kawas may be

taken.

(xii) By charging 220 kV Kawas - Ichhapur line (3 Kms), supply to ONGC and GAIL Hazira

may be availed to be extended to maintain gas pressure of HBJ pipe line.

(xiii) By charging 220 kV Icchapur - Vav line (34 Kms), start up power to Utran CCPP

through 66 kV line and then to Kakrapar, Ukai (Th) and (Hydro) via 220 kV Vav –

Kakrapar line (43 Kms) is to be availed.

(xiv) As mentioned earlier restoration of loads shall be in small steps such that the frequency

change is not more than 0.5 Hz. In case of failure of DG set to start, start up power to

Jhanor shall be provided as per the procedures described under 4.2.2 & 4.2.3. If power is

available at CLPIPL, then through 400kV CLPIPL-Jhanor S/C and then from 220kV

Haldarwa by charging 220kV Jhanor-Haldarwa lines.

C. Ukai hydro Power Station (75 MW x 4 Units)

(i) D.G. Set of 500 kVA is available at Ukai main hydro power station. This set can be

started and auxiliaries to any one of 4 units can be fed, thereby main unit can be started

immediately. Simultaneously 50 KW house set of Mini Hydro station is to be used to

start 2.5 MW x 2 sets and charge 66kV line to main hydro station. Main unit can be

started either through its own DG or through power extended from Mini Hydro


whichever comes first. Once the main unit is started, it can give start up power to Ukai

Thermal Power Station on one of the 220 kV Ukai Hydro-Ukai Thermal Tie lines. The

75 MW unit requires minimum 40 MW load for normal running, the same can be made

available by 66kV radial feeders from 50 MVA, 220/66 kV transformer installed at 220

kV main hydro switch-yard and 66kV lines feeding Songadh, Vyara, Nizar and Sagbara,

which is 25 to 30 MW.

(ii) By charging 220kV Ukai (Th) - Vav - Kakrapar from Ukai, keeping the breaker at Vav

open and observing the voltages within operating limits, Kakrapar is to advised to draw

survival power/ start-up power.

(iii) After charging 220 kV Bus of Vav substation, power to essential services like Railways

(through 66kV line to Bhestan) and Surat City may be catered.

(iv) Also start up power to Utran CCPP is to be extended through 66kV Vav – Utran line to

start the station and add generation.

(v) If generation at Kawas is available due to operation / survival of any of the unit on

house load, the system may be strengthened by charging 220 kV Vav - Ichhapur line (34

km) and 220kV Ichhapur - Kawas line (3 km) with addition of more generation.

Extension of power to essential services like ONGC Hajira for maintaining gas pressure

of HBJ pipe line feeding to Kawas and other important industries located on the

upstream may be explored and carried out.

(vi) Power to be extended to Navsari via 220kV Vav-Navsari line (33 km) to feed Railways

and Navsari town by ensuring adequate inductive loading to compensate capacitive

effect while charging long line. A concentrated load of town / city may be released along

with that of Railways after taking into due consideration of frequency and stiffness of the

island.

D. Kadana Hydro Power Station (60 MW x 4 units)

DG set of 500 kVA is available at Kadana Hydro Power Station. This set can be started

to feed the auxiliaries of any one of 2 units. Once main unit is started it can give start up

power via 220 kV Kadana-Godhra and from Godhra to Wanakbori.

E. A.E.Co. (Torrent Power), Sabarmati Gas Station (32.5 MW x 2 GT +35 MW ST)

(i) 500 kVA DG set to be taken into service to feed start up power to one GT unit. With

availability of sufficient gas pressure, GT unit is to be taken up. Once one GT unit is

started, auxiliary power to be extended to C,D,E and F units.

ii) Power to be fed to ONGC Kalol to help maintain gas pressure to operate second GT unit.

(iii) Once any of C,D,E,F units starts generation, restoration of power to Ahmedabad and

Gandhinagar may be initiated.

(iv) Auxiliary power to Gandhinagar and Wanakbori TPS can be restored subsequently.

F. GIPCL CCPP (32 MW X3 Units and 105 MW Unit)

DG set of 500 kVA capacity is available.


(i) If GIPCL CCPP is successfully islanded and survived, power to be extended to Jambua

through GIPCL Nandesari- Jawaharnagar- Jambua lines to feed to Railways, Vadodara

City and GAIL Wagodia.

(ii) To extend power to Haldarwa substation via 132 kV Jambua - Karjan line (21km) and

132 kV Karjan - Haldarwa line (35km) to feed to railways and Bharuch city.

(iii) If generation at Jhanor is available due to operation of one of its three units in house

load, 220 kV Haldarwa - Jhanor line (13kms) may be synchronised (at Jhanor) to add

more generation and strengthen the network.

(iv) Start up power to CLPIPL may be taken via 220 kV Haldarwa - CLPIPL line and on

starting generation at CLPIPL, loads to be slowly resumed and network to be expanded

and built up.

(v) Further expansion of network may be done by Charging 220 kV Haldarwa - Kawas line

(81kms) and synchronizing Ukai - Kawas system with GIPCL - Jhanor system at Kawas.

(vi) Extend power of GIPCL to Dhuvaran, if Dhuvaran can not start its DG set to start GT

unit, via 132 kV GIPCL - Nandesari - Jawaharnagar - Fertiliser - Gotri - Dhuvaran lines

and start GT unit to feed auxiliaries of other units.

(vii) From Dhuvaran feed power to Gandhinagar via 132 kV Dhuvaran - Vatva - Ranasan and

220 kV Ranasan - Gandhinagar lines.

(viii) Extend power available at Jambua to Asoj and then Wanakbori via 220 kV Jambua -

Asoj - Wanakbori lines. From Wanakbori extend power first to Godhra and Kadana via

220 kV Wanakbori - Godhra – Kadana lines and start Kadana units to add generation to

the expanded network. Restore Railway supply from Asoj, Godhra and Dahod.

(ix) Power available at Dhuvaran can be fed to Railways from Anand, Mahemdawad via 132

kV Dhuvaran - Karamsad - Ode line and 132 kV Karamsad - Nadiyad - Mahemdawad

line.

(x) Power available at Haldarva or Jambuva can be extended to Zagadia through 220kV

Haldarva-Zagadia-Mangrol S/C or through 220kV Jambuva-Zagadia-Mangrol S/C.

(xi) Power available at Wanakbori/Gandhinagar/Ranasan can be extended to Sikka through

220kV Wanakbori/Gandhinagar-Ranasan-Karamsad-Limdi-Jetpur & 220kV Jetpur-

Jamnagar and 132 kV Jamnagar-Sikka.

(xii) Start up power to Panandro can be extended from Sikka via 132kV Sikka-Wanakner-

Anjar S/C and 220/132kV ICT at Anjar and 220kV Anjar-Kukma-Panandro D/C.

G) SUGEN(3 GTs of 382.5 MW each):

2-DG sets of capacity 6 MVA each are available at Sugen power plant(3x382.5MW)

from which power supply can be extended to GSEC via 220 kV Sugen-Kim-GSEC D/C.


4.2.2 SCENARIO # 2: FROM MAHARASHTRA

In order to start at least one unit each at Kawas and Ukai about 10 MW power is required.

WRLDC would arrange about 10 MW power from Maharashtra either on 220 kV TAPS –

Bhilad- Navsari or on 220 kV Nasik - Navsari D/C whichever route is feasible at that moment to

supply power. Following action are to be taken from Navsari end.

1. Navsari would be advised to make necessary arrangements for getting power supply

from TAPS / Nasik.

2. Navsari would extend the supply to Kawas on 220 kV Navsari- Kawas D/C and to Vav

on 220 kV Navsari - Vav D/C.

3. Kawas would be advised to make necessary arrangements to receive the power on 220

kV Navsari- Kawas D/C and extend the same to Kawas Gas power station to start at

least one unit at Kawas.

4. Once the unit at Kawas start generating power, Power can be extended to Haldarwa on

220 kV Kawas - Haldarwa D/C. Essential loads in Bharuch can be restored and power

can be extend to Karamsad on 220 kV Haldarwa-CLPIPL-Karamsad D/C if sufficient

amount of power is available at Haldarwa end.

5. Vav would be instructed to make necessary arrangements to receive the power on 220

kV Navasari - Vav D/C.

6. Vav would extend the power to Ukai and Kakrapar on 220 kV Vav- Ukai and Vav -

Kakrapar respectively.

7. Ukai and Kakrapar would be advised to avail the power received from Vav to start the

units at Ukai (T) and for providing survival power and start-up power to the units at

Kakrapar respectively.

8. Once the units at Kakrapar & Ukai (T) start generating power, the power can be

extended to central Gujarat area on 220 kV Kakrapar - Haldarwa D/C, 220 kV Ukai -

Achhalia and 400 kV Ukai - Asoj to restore the essential loads and to extend the power

supply to start other thermal generating units in Gujarat.

9. 400kV Padghe- Boiser(PG)- Vapi(PG)- Sugen- Jhanor line can also be used to extend

supply from Maharashtra.

4.2.3 SCENARIO #3: FROM MADHYA PRADESH

All efforts to be made to start the thermal generating units by getting the supply from Ukai (H),

Kadana (H), Kawas, Dhuvaran, A.E.Co. C, GIPCL, Sugen where black start facilities are

available. In case of non availability of DG Sets at Ukai and Kadana Hydro power station and

Kawas and unsuccessful operation of islanding scheme of A.E.Co. `C` station /Dhuvaran - II /

GIPCL, LD Jambuva will contact WRLDC to arrange the assistance from other constituents. In

order to start at least one unit each at Wanakbori and Ukai (Th) power station, about 25 MW

power is required. WRLDC would arrange about 30 MW power from Madhya Pradesh on 400


kV Indore - Asoj lines. One of the Indore - Asoj lines can be charged depending upon the bus

voltage at 400 kV Indore S/S.

Following actions are to be taken from Asoj end.

1. SLDC,Gujarat would advise Asoj to make necessary arrangements for getting power

supply from Indore and taking into service 400 kV Indore - Asoj lines. Use bus reactors

at Asoj and tertiary reactors at Indore to control the high voltage problem.

2. Asoj would extend the supply to Wanakbori and Ukai on 400 kV Asoj - Wanakbori and

Asoj - Ukai lines.

3. SLDC,Gujarat would advise Ukai(T) to make necessary arrangements to take the supply

from Asoj.

4. Wanakbori would extend supply to start one unit at power house. Once one unit is started

all other units can be started sequentially.

5. Depending upon the power assistance possible from Madhya Pradesh, Wanakbori would

charge the 400/220 kV ICT and supply can be extended to start the other units at

Wanakbori.

6. 220kV Wanakbori S/S would extend the supply to Gandhinagar thermal power station on

220 kV Wanakbori - Ranasan - Gandhinagar lines.

7. Gandhinagar would make the necessary arrangements to receive the power from Ranasan

and would extend the supply to start the units at Gandhinagar.

8. Once the units at Gandhinagar start generating sufficient amount of power, the same can

be extended to Mehsana on 220 kV Gandhinagar –Nardipur-Mehsana.

9. Mehsana would extend the supply to start the units at KLTPS on the route 220 kV

Mehsana – Anjar –Kukma- Panandro.

10. Mehsana, Anjar and Panandro would be advised to avail the power and extend the same

to start the units at KLTPS and Akrimota.

11. Ukai would be advised to extend power to Ukai (T) to start one unit by availing the

supply from Asoj. After starting one unit, supply can be extended to start the other units.

12. Ukai would extend the supply to Kakrapar on 220 kV Ukai (T) –Vav-Kakrapar feed line

for survival power and to start the unit at KAPS.

13. Ukai would extend the supply to Vav on 220 kV Ukai(T) - Vav and essential load in

Surat town can be restored to the limit of availability of power.

14. Vav would extend the supply to Kawas Gas power station to start the units at Kawas.

15. Vav and Kawas would extend the supply to Navsari to restore the loads in Navsari and

Vapi and also to extend the supply to TAPS and Nasik in case of failure of supply in

Maharashtra system.


16. Extending supply to Sikka TPS can be done through the path 220kV Wanakbori- Gandhi

Nagar-Ranasan-Karamsad-Limdi-Jetpur and 132kV Jetpur- Jamnagar-Sikka.

4.2.4 SCENARIO #3: FROM NORTHERN REGION (NR)

If Rajasthan(NR) system is intact startup power may be availed from NR over 400 kV

Kankroli-Kansari and 400 kV Bhinmal-Kansari and then power can be extended via 400

kV Kansari-Soja-Wanakbori to Wanakbori Thermal Power Station(TPS).Wanakbori

would use the start up power to start one unit and extend power to start other units

sequentially.

Depending upon the system condition 400/220 kV ICT at Wanakbori may be charged

and power supply may be extended to Gandhinagar TPS via 220 kV Wanakbori-

Ranasan-Gandhinagar and sub-systems can be gradually built up as described in earlier

sections.

4.3 GUJARAT SYSTEM – IDENTIFIED GRID PATH FOR START UP POWER

TO POWER STATIONS WHERE STARTUP SOURCE IS NOT AVAILABLE

Kakrapar

Path I - Ukai(H) / LBC(H) / via Ukai(T) – Vav 220kV circuitI -Teed connector at

Kakrapar

Path II - From 220kV Kawas-Haldarwa-Kakrapar D/C

Path III - From 220kV Jhanor-Haldarwa-Kakrapar D/C

Path IV - Kawas-Vav-Kakrapar D/C

Path V - 220kV Kawas-Navsari-Vav-Kakrapar

Ukai (Thermal)

Path I - 220kV Ukai (H) – Ukai (T) D/C (From Ukai(H) or LBCH)

Path II - 220kV Kawas-Vav D/C and 220kV Vav-Ukai(T) D/C

Path III - 132kV GIPCL – Nandesari-Asoj and through 132/220/400kV ICT at Asoj to

Ukai on 400kV path.

Path IV - 400 kV SSP- Asoj – Ukai(T)

Sikka (Thermal)

Path I - From RPL on 132kV RPL-Khambalia - Sikka S/C

Path II - 132kV Wankaner-Sikka

Path III - 132kV Jamnagar-Sikka

Path IV - 220kV Wanakbori / Gandhinagar- Ranasan-Karamsad-Limdi - Jetpur –

Jamnagar &132kV Jamnagar- Sikka


Dhuvaran (Thermal)

Path I - 132kV AE Co.- Sabarmati – Ranasan-Watwa-Dhuvaran D/C

Path II - 132kV GIPCL-Jawahar Nagar-Jambua - Gotri-Dhuvaran

Path III - 132kV AE.Co(gas),Watwa- Watwa(Gujarat)-Dhuvaran

Gandhinagar

Path I - 132kV AE.Co- Sabarmati – Ranasan D/C – 220/132kV

ICTs at Ranasan-Gandhinagar D/C.

Path II - 220kV Wanakbori-Ranasan-Gandhinagar D/C-Wanakbori

Path I - Kadana-Godhra-Wanakbori

Path II - 132kV AE.Co–Sabarmati-Ranasan D/C – 220/132kV ICTs at Ranasan-

Wanakbori D/C

Path III - 132kV GIPCL – Nandesari – Asoj through 132/220kV ICT at Asoj and

220kV Asoj - Wanakbori D/C

Path IV - SSP – Asoj - Wankabori

Panendro

Path I - 220kV Anjar-Kukma-Panendro D/C

Path II - 400 kV Gandhar-Dehgam-Sami-APL Mundra-N‟Khakar-Nakhatrana-

Panendro

Essar

Path I - 220kV Kawas-Ichhapur-Essar

Path II - 220kV KAPS/ Jhanor/CLPIPL-Haldarwa- Kawas-Ichhapur-Essar

Path III - 220kV KAPS-Vav-Sachin-Essar

Path IV - 220kV Ukai(T)-Vav-Sachin-Essar

SLPP

Path I - 220kV Utran-Kim-Zagadia-SLPP(Mangrol)

Path II - 132kV Dhuvaran-Gotri-Jambua & 220kV Jambua-Zagadia-SLPP

Path III - 132kV GIPCL-Jawaharnagar-Jambua & 220kV Jambua-Zagadia-SLPP

Path IV - 220kV KAPP/Kawas/Jhanor/CLPIPL-Haldarwa - Zagadia-SLPP

Path V - 132kV A.E.Co.-Ranasan-Karamsad- Jambua & 220kV Jambua-


Zagadia-SLPP

Utran

Path I - 220kV Ukai/Kawas/Kakrapar-Vav & 66kV Vav-Utran

Path II - 220kV SLPP-Zagadia-Kim-Utran

Path III - 220kV GSEC-Kim-Utran

Path IV - 220kV Kawas/Jhanor/CLPIPL/KAPP – Haldarva-Kim-Utran

GSEG, Hazira

Path I - 220kV Utran-Kim-GSEG- CLPIPL

Path I - 400kV Jhanor-CLPIPL

Path II - 220kV Jhanor-Haldarwa-GPEC

Path III - 220kV Gandhinagar-Karamsad-CLPIPL

Path IV - 220kV Wanakbori-Ranasan-Karamsad - CLPIPL

Path V - SSP-Kasor-CLPIPL

Akrimota

Path I - 220 kV Panandro- Akrimota- D/C

Path II - 220 kV Nakhatrana- Panandro-Akrimota D/C

APL,Mundra

Path I - 220 kV Panendro-Nakhatrana–Nanikhakar – APL, Mundra

Path II - 400 kV SSP-Asoj-Chorania-Hadala-220kvHadala-Varsana-APL,Mundra

Path III - 400 kV Gandhar-Dehgam-Sami-APL,Mundra

CGPL(UMPP),Mundra

Path I - 400 kV Gandhar-Dehgam-Ranchodpura-Bachchao-CGPL,Mundra.

Path II - 400 kV SSP-Asoj-Choronia-CGPL

***


13

LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Guja

rat

Se

lf S

tart

LE

GE

ND

:

Sta

tion T

o S

elf

- S

tart

Hyd

ro

Therm

al

Nucl

ear

Sub-S

tatio

ns

400 K

V

220 K

V132 K

V

66 K

VA

ltern

ate

Path

Godhra

Uka

i (H

)

Kadana(H

)

Ste

p N

o0

12

34

Uka

i (T

)

Wanakb

ori

Ranasa

n

Anja

rM

ehsa

na

56

Jaw

ahern

agar

Jam

buva

Ach

halia

AE

CO

.(G

)G

andhin

agar

Nard

ipur

Panandro

Sabarm

ati

Jetp

ur

Palia

dD

huva

ran

GIP

CL

Gandhar

Kaw

as

Gondal

Jam

nagar

Sik

ka

Wanka

rer

Lim

di

Vav

Vapi

Hald

arv

a

Kakr

apar

Navs

ari

Aso

jN

andesa

ri

Kim

Zagadia

Sura

t Lig

nite

Utr

an

GP

EC

Gotr

i

Kara

msa

d

Karjan

Ichhapur

Wagodia

Bhila

d

Tara

pur

Vatw

a

GS

EC

Akr

imota

SS

P

Kaso

r

Fe

rtili

zer

Na

ga

r

Meh

sana

Sa

nkh

ari

Sh

ivle

kha

We

lsp

un

An

jar

Ku

kma

N

'Kh

akk

ar

N

akh

atr

ana

Pa

ne

nd

ro

De

hga

mS

am

iG

and

ha

rS

uge

n

AP

L(M

un

dra

)

Ra

nch

od

pu

raC

GP

L(M

un

dra

)B

ach

chao

2.5

8

34

73

7

80

35

47

19.8

2.1

9.2

19.8

830.2

13 81

34

6289

49

74

117

81

10.3

21

27

16

55

2249

35

21

12.9

35

98

7318

548

27.5

124

Dar

ol27

92

138

26

106

106

50

152

64

59

282

157

16.3

75

3

100

41

Dha

ndhu

ka

96

82

108

(Fig

ure

show

s lin

e le

ngth

in K

m)

62

280

Exh

ibit

- 1

/Sce

nario

1

30

146

26

10.2

7.1


LEG

END

:

Stat

ion

to s

elf-s

tart

Hyd

ro

Ther

mal

Nuc

lear

Subs

tatio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rnat

e Pa

th

(Fig

ure

show

s lin

e le

ngth

in K

m)

Exhi

bit -

1 /S

cena

rio 2

Scen

ario

- II

Jam

bua

Acha

lia

Kaw

asN

avsa

ri

Uka

i( T

)

Step

No

01

23

45

6

Guj

arat

: Sta

rt up

from

Mah

aras

htra

Kakr

apar

Vav

Asoj

Wan

akbo

ri

GPE

CG

andh

arH

alda

rwa

Tara

pur

Kar

amsa

d

Gan

dhin

agar

Nas

ik

Mah

aras

htra

Vapi

7

Bhila

d

Bois

er

(PG

)

Uka

i( H

)

Vapi

(PG

)

Ran

asan

Suge

n

81

117

33 8962

171

90

64 118

2.5

81

43

140

7637

10.2

9

19.8

49

13

6383

774825

95

66

71

47


LEG

EN

D:

Sta

tion

to s

elf-s

tart

Hyd

ro

Ther

mal

Nuc

lear

Sub

stat

ions

400

KV

220

KV

132

KV

66 K

V

Alte

rnat

e P

ath

(Fig

ure

show

s lin

e le

ngth

in K

m)

(San

khar

i-Shi

vlek

ha-W

elsp

un-A

njar

)

Exh

ibit

- 1/ S

cena

rio 3

Sce

nario

- III

Akr

imot

aA

njar

Vav

Guj

arat

:

Sta

rt up

from

Mad

hya

Pra

desh

.

Ste

p N

o1

23

45

67

Indo

r

eA

soj

Wan

akbo

riR

ansa

nG

andh

inag

arM

ehsa

naP

anen

dro

Kaw

asN

avsa

ri

Kak

rapa

rU

kai(T

)

Mad

hya

Pra

desh

Hal

darv

a

Gan

dhar

80

Tara

pur

Vap

i

Nas

ik

Kar

amsa

dLi

mdi

Jetp

urJa

mna

gar

Sik

ka

Kuk

ma

Had

ala

Bhi

lad

Zaga

dia

289

70

76 140

19.8

63S

oja

185

16 Sal

ejav

a

3571

166

7316

124

27.5

115

9227

7775

6649 13

37 55

3362

22

171

81

5543

74


LE

GE

ND

:

Sta

tion to s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

(Fig

ure

sh

ow

s lin

e le

ng

th in

Km

)

(Sa

nkh

ari-S

hiv

lekh

a-W

els

pun

-Anja

r)

Exh

ibit

- 1

/ S

cena

rio 4

Sce

na

rio -

IV

Akr

imo

taA

nja

r

Va

v

Guja

rat

:

Sta

rt u

p f

rom

N

ort

hern

Reg

ion

.

Ste

p N

o1

23

45

67

Bh

inm

al

Aso

jW

ana

kbori

Ra

nsa

nG

and

hin

agar

Meh

sana

Pa

ne

nd

ro

Ka

wa

sN

avs

ari

Ka

kra

pa

rU

kai(T

)

NR

.

Ha

ldarv

a

Ga

nd

har

80

Ta

rap

ur

Va

pi

Na

sik

Kara

msa

dL

imdi

Jetp

ur

Jam

nag

ar

Sik

ka

Ku

kma

Ha

dala

Bh

ilad

Za

ga

dia

Ka

nsa

riS

oja

Ka

nkr

oli143

234

70

76

140

19.8

63

So

ja

185

16

Sa

leja

va

35

71

166

73

16

124

27.5

115

92

27

77

75

66

49 13

37

55

33

62

22

171

81

55

43

74


CHAPTER – 5


FOR

MADHYA PRADESH

In case of total black out in Madhya Pradesh system, the following possible scenarios are

recommended for system restoration in the state based on black start facilities available in the

state and sources from outside the state. Enclosed Exhibits show the schematic diagrams for

scenarios and restoration plans based on island approach.

5.0 SCENARIOS OF RESTORATION

5.1 SCENARIO # 1: FROM OWN BLACK START SOURCES

A. Bargi Hydro power station (2 x 45 MW)

A DG set of 250 KVA is available at Bargi hydro power station. This set can be started and

auxiliaries to one or both sets can be fed thereby both units can be started immediately. Once the

main units are started, start up power to Amarkantak power station can be extended on 132 kV

Bargi-Jabalpur and 220 kV Jabalpur-Amarkantak line. After sufficient generation is available,

power supply to the essential load will be restored. Start up power supply can also be fed from

Bargi HP to Satpura TPS through 132 KV Bargi-Lakhanodone- Seoni-400 kV Seoni-Satpura

feeder.

B. Pench hydro power station (2 x 80 MW)

Start up facility in the form of 250 KVA DG set is available at Pench hydro power station.

Auxiliaries to any one of the two sets can be fed and the main unit can be started immediately.

Once the main unit is started, start up power can be extended to Satpura power station through

132 kV Pench-Seoni-Amarwara- Chindwara-Satpura line up to 132 kV & 220 kV Satpura

substation and then to 220 kV Satpura PH Bus. Generating units at Satpura can be started and

after sufficient generation is available power supply to the essential load can be restored. In this

case considerable voltage and power hunting is expected as experienced earlier. Voltage hunting

is controlled by putting some load at Seoni, Chindwara & Satpura 132 kV substation. Start up

power can also be extended to Khaperkheda / Koradi power stations. In case MP & Maharashtra

grids have to be restored without parallelling, then Pench units can be connected to MP &

Maharashtra through separate buses at Pench by opening bus-coupler.

C. Bansagar-I (Tons) hydro power station (3 x 105MW)

250 kVA DG set is available at Bansagar-I (Tons) hydro power station. No DG sets are available

at 2x15 MW Bansagar-II (Silpara) and 3x20 MW Bansagar-III (Devlone). To start units at

Bansagar-II and Bansagar-III, 220kV Bansagar (Tons)-Rewa D/C, 132kV Rewa-Bansagar-II

D/C and 132kV Rewa-Bansagar- III S/C lines can be taken into service. After starting the DG

Set, auxiliary power to any one of the three units can be fed. Once the unit is started start up

power to Sanjay Gandhi Thermal Power Station can be extended on 220 kV Bansagar- I (Tons)-

Satna line and 220kV Satna-Birsinghpur line. After starting unit at Sanjay Gandhi TPS and

when sufficient generation is available, essential load can be restored. However due to load -

generation balance, voltage hunting was observed and Tons HPS unit got tripped 2-3 times


during restoration on 30.07.2002. Proper co-ordination among the power house personnel and

sub station staff is essentially required during such activities to save valuable time and resources.

D. Birsinghpur Hydro power station(1x20 MW)

Unit can be started using 220 Volt batteries and power can be extended to Birsinghpur thermal

station to start one unit with essential auxiliaries required for start up. Other units can be started

after the stabilization of the first unit. However utmost care is required to be taken to connect

only selective loads to ensure stability of small hydro unit of 20 MW size against heavy jerks

coming from starting up of high capacity thermal auxiliaries like boiler feed pump etc.

E. Indirasagar Hydro power station (8x125 MW)

In the condition of system collapse, one unit of Indira Sagar (ISP) can be started immediately

with the help of D G Set of 2x1000 KVA.Then 400 kV Indira Sagar-Indore (80km) one circuit

can be charged and an island can be built up with restoration of some load at 220 kV Indore-

II(Jetpura) 220/132/33 kV S/S.The ISP-Indore-Jetpura is-land had been successfully created

during a black start mock exercise on 22nd

May,2011(annex-IX).Based on the prevailing

condition and stiffness of the island formed around Indira Sagar, start up power can be provided

to Satpura TPS through 400 kV ISP- Satpura line.

F. Gandhisagar Hydro power station (5x23 MW)

110 KVA DG set at Gandhisagar can be used to black start Gandhisagar units and power supply

can be extended to Satpura power station through 132kV Gandhisagar-Garoth-Badod-Ujjain-

Makshi-Shajapur-Shujalpur-Bhopal-Itarsi link up to Itarsi and then 220 kV supply may be

extended through 220 kV Itrasi- Satpura.

G. Omkareswar Hydro power station (8 x 65 MW)

2 x 1010 KVA DG Set is available which can be used to start up the units. Then power can be

extended to Satpura via Omkareswar-Burwaha – Itarsi – Satpura 220 KV link. Essential and

traction loads of Khandwa, Ratlam, Indore etc. also can be restored through the respective 220

KV links depending upon water availability.

H. Bansagar stage –III Hydro Power Station (3x20 MW)

Start-up power in the form of 250 kVA DG set is available. All three units can be started one by

one with help of DG sets immediately and 132 kV supply to Bansagar stage II and IV can be

extended to Rewa 220kV sub-station and then this supply may be extended to Rewa 220 kV

sub-station and then this supply may be extended to Amarkantak Thermal power Station through

220 kV Rewa-Sidhi-Amarkantak.

I) Marhikheda (3x20 MW)

One DG set of 250 KVA is available at Marhikheda.All three units can be started one by one

with help of DG set. Supply to Gwalior area can be extended through 132 kV Marhikheda-

Karera-Gwalior link.Supply to Gwalior and Datia railway traction point can also be extended.

J) Rajghat Hydro Power Station(3x15 MW)


Start-up facility in the form of 250 kVA DG set is available .All three machines can be

started with help of DG sets immediately and supply to Pichhore, Bina and Sagar area can be

extended through 132 kV Rajghat-Bina-Sagar link. Supply to Bina and Makronia Railway

traction point can also be extended.

5.2 SCENARIO # 2: FROM CHHATTISGARH

Start up power through 220kV Korba (W) –Kotmikala-Amarkantak line can be availed from

Korba (W). The generating units at Amarkantak would be started. Once the units at Amarkantak

are started, the power can be fed to Birsinghpur on 220kV Amarkantak-Birsinghpur lines.

Alternatively start up power can be availed via 132 kV Dongargharh-Balaghat path or 132 kV

Bango-Manendragarh path. 400 kV Bhilai-Seoni or 400 kV KSTPS-VSTPS path can also be

explored based on the condition and convenience.

5.3 SCENARIO # 3: FROM GUJARAT

Indore can make necessary arrangements to receive the power from Asoj through any one of 400

kV Asoj - Indore D/C. Indore can then extend the power to Satpura PS through 400/220 kV ICT

at Indore and 220 kV line from Indore – Burwaha - Itarsi - Satpura to start the units at Satpura.

Once the units start, power can be extended to other power stations and esseintial loads. This

option can be tried in the least due to involvement of long line sections and associated high

voltage. Start up power can be extended from SSP through SSP- Nagda- Indirasagar line to

Indirasagar power station which can be further extended to Satpura.

5.4 SCENARIO # 4 : FROM MAHARASHTRA

A. Through 220 kV Kalmeshwar -Pandhurna

1. Pandhurna makes necessary arrangements to receive the power from Kalmeshwar and

extends to Satpura.

2. Satpura extends the power to start the units at Satpura power station.

3 Once the units at Satpura are started, depending on the availability, Satpura extends the

power to 220 kV Itarsi on 220 kV Satpura - Itarsi.

4 Itarsi extends the supply to 220 kV Jabalpur on 220 kV Itarsi - Jabalpur line. Jabalpur

makes necessary arrangements to receive the same.

5 Jabalpur extends the supply to Amarkantak on 220 kV Amarkantak - Jabalpur line to start

1 or 2 units at Amarkantak depending on the power availability.

6 Amarkantak after having sufficient quantum of generation, extends supply to SGTPS on

220kV Amarkantak-Birsinghpur.

7 Jabalpur also extends the power supply to Bargi hydel power station. through 220/132 kV

ICT & 132 kV Jabalpur - Bargi line to start the units at Bargi.

B. Through 132 kV Pench-Kanhan D/C

1 Pench makes necessary arrangements to receive the power from Kanhan through 132 kV

Pench - Kanhan D/C to start the units at Pench hydel power station.


2 Once the units at Pench are started power can be extended to start the other thermal units.

5.5 SCENARIO # 5 : FROM NORTHERN REGION

A. Through 400 kV HVDC bypass link

Startup power as a first source can be taken through 400 kV HVDC bypass link from Northern

Region. Operating staffs at HVDC Vindhyachal shall initiate actions to extend start up power

from NR to WR after receiving necessary codes from both NRLDC & WRLDC. Western

Region can draw around 200 MW of power from NR after due consent of NRLDC / NLDC as

per the existing arrangement (100 MW for VSTPS and 100 MW for KSTPS). Vindhyachal back

to back station shall request Singrauli to extend start up power from NR through HVDC bypass

link. The start up power will then be extended to KSTPS. Detailed Procedures are enclosed at

Chapter-9.

In case of high voltage problem in charging Vindhyachal-Korba line, loads at Waidhan &

Morwa can be restored using 132kV Vindhyachal-Waidhan D/C. This may require more

assistance from NR. Further power can be extended to Amarkantak for start up through 132 kV

Waidhan-Amarkantak S/C or 132 kv Waidhan-Morwa single circuit. Based on availability of

assistance from NR, start up power from Amarkantak can be extended to Birsinghpur on 220kV

Amarkantak-Birsinghpur line.

B. From Rihand through 132 kV Singrauli - Vindhyachal - Rihand to start VSTPS.

Startup power can be taken from NR through 132 kV lines (Singrauli -Vindhyachal - Rihand).

However the available power on 132 kV would be optimum for Vindhyachal only and power

cannot be catered to Korba NTPC through this route.

C. From 132 KV Anpara – Amarkantak Line

Start-up power can be availed from Anpara TPS of U.P through 132kV Anpara-Morwa-

Amarkantak lines.

D. From 220 KV Auriya- Malanpur and 220 KV Auraiya-Mehgaon

The 220 KV network of MP in this area i.e Auraiya – Malanpur/Mehgaon – Gwalior – Bina –

Damoh – Katni – Birsinghpur and Bina – Bhopal – Itarsi – Satpura etc. can be explored as per

situational requirement.

E. From 132 KV R P Sagar-Gandhi Sagar

The 132 KV RP Sagar-Gandhi-Sagar-Ujjain and Gandhi Sagar-Neemuch-Nagda paths can also

be explored as per situational requirement.

F. From Kota through 220 kV Badod – Kota and Badod-Modak lines

Past experience showed that this link is not useful for availing start up power from NR due to

longer line length and higher voltage level.


5.6 MADHYA PRADESH SYSTEM - IDENTIFIED GRID PATH FOR

STARTUP POWER TO POWER STATIONS WHERE STARTUP SOURCE IS

NOT AVAILABLE

SGTPS (Birsinghpur)

Path I - Birsinghpur hydel power station (20 MW) through 220kV inter connector

Path II - Tons hydel project through 220kV Bansagar- Satna-Birsinghpur D/C

Path III - 220kV Amarkantak-Birsinghpur D/C from Amarkantak.

Path IV - 400 kV Indirasagar-Satpura-220 kV Satpura- Itarsi-Jabalpur-

Amarkantak – Birsinghpur D/C

Amarkantak:

Path I - Bango HEP through 132kV Amarkatak- Manendragarh- Bango line (S/C)

Path II - Korba(W) TPS through 220kV Korba (W) –Kotmikala- Amarkantak

D/C.

Path III- Bargi hydel power station through 132kV Bargi-Jabalpur-Amarkantak

lines (D/C)

Path IV- Tons power station through 220kV Bansagar-Satna-Birsinghpur-

Amarkantak S/C

Path V- From Pench HEP through 132kV Pench-Seoni-Lakhnadone-Bargi-

Jabalpur D/C line and 220kV Jabalpur - Amarkantak D/C line.

Path VI- From Satpura TPS through 220kV Satpura-Itarsi-Jabalpur-Amarkantak

D/C

Path VII- Vindhyachal STPS through 132kV Vindhyachal-Waidhan-Morwa-

Amarkantak path.

Path VIII- Anpara TPS of U.P through 132kV Amkantak-Anpara- Morwa lines. One

circuit goes from Waidhan to Amarkantak and other circuit goes to

Morwa.

Path IX- 400 kV Indira Sagar -400kV Satpura- 220kV Satpura -220kV Itarsi-

Jabalpur-Amarkantak

Satpura

Path I - Pench hydel project through 132kV Pench- Seoni-Amarwara-

Chindwara-Satpura line.

Path I I- From Maharashtra via 132kV Kanhan-Pench-Seoni-Amarwara-

Chindwara- Satpura line.


Path III- Koradi TPS of Maharashtra through 400kV Koradi- Satpura (S/C) and

220kV Satpura- Kalmeshwar-Ambazari-Koradi

Path IV- From Gandhisagar or Kota to Ujjain through 220kV Ujjain-Burwaha-

Itarsi-Satpura line

Path V- From Gujarat through 400kV Asoj-Indore D/C, 220kV Indore-Burwaha-

Itarsi-Satpura line OR 132kV Gandhisagar-Garoth-Ujjain-Makshi-

Shujalpur- Shajapur-Bhopal-Itarsi-Satpura.

Path VI- 400kV Asoj-Indore-Indirasagar-Satpura

Path VII- From Bargi hydel project through 132 kV Bargi-Lakhanodone-Seoni-

Amarwara-Chhindwara-Sarni feeder.

Path VIII- 400 kv Indirasagar-Satpura-220 kV Satpura

VSTPS*

Path I - 400kV AC by-pass at Vindhyachal HVDC

Path II - 132kV Rihand -Singrauli- Vindhyachal

Path III- From Amarkantak on 132kV Amarkantak- Morwa-Waidhan-Vindhyachal

D/C

Path IV- From KSTPS on 400kV KSTPS-VSTPS D/C

* The above start up sources are in the order of priority. In case VSTPS gets start up power

using paths II & III, it is not possible to extend start up power from VSTPS to KSTPS till some

units are brought up on bars at VSTPS.

Jaypee Bina

Path I - From 400 kV Satpura-Itarsi-Bhopal-Bina-Jaypee Bina

Path II - From 400 kV Birsingpur-220 kV Damoh- Bina-Jaypee Bina

***


Exh

ibit

- 2

/ Sce

nario

1

Sce

nario

- I :

Fro

m o

wn

Bla

ck S

tart

Sou

rces

Ban

saga

r T

ons

Sat

na

LEG

EN

D:

Bar

giS

tatio

n T

o S

elf -

Sta

rt

Hyd

ro

The

rmal

Pen

chB

lack

Sta

rt

Seo

niC

hhin

dwar

Sat

pura

Sub

-Sta

tions

400

KV

Gan

dhis

agar

220

KV

132

KV

Alte

rnat

e P

ath

Indi

rasa

gar

Sat

pura

Kor

adi

VS

TP

SK

ST

PS

Kor

ba (

E )

Am

arka

ntak

Ste

p N

o1

23

45

67

Mad

hya

Pra

desh

Birs

ighp

ur (

H)

Jaba

lpur

Kor

ba(

W )

8

Man

endr

agar

h

Birs

ighp

ur (

T)

Ban

go

Mor

wa

Wai

dhan

Kor

adi

Kha

perk

heda

Ujja

inS

hahj

apur

Shu

jalp

urB

hopa

lIta

rsi

Kha

perk

heda

Kot

mik

ala

Lakh

nado

ne

Mak

shi

Am

arw

ara

G'S

agar

Gar

oth

Bad

od

Ujja

in

Om

kare

swar

Bur

wah

aIta

rsi

76

Nar

sing

hpur

18

233

2210

0

158

61

51

215

1016

5

71

74

71

66

154

2718

2

26

101

14

8

65

7936

149

10

2482

8550

1931

77

5176

77.6

3171

190

149

13

188

(Fig

ure

show

s lin

e le

ngth

in K

m)


LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Exh

ibit

- 2

/S

cen

ari

o 2

Sce

na

rio-

II :

Sta

rt u

p f

rom

Ch

ha

ttis

ga

rh

Ch

ha

ttis

ga

rh

Ste

p N

o1

23

45

67

Ma

dh

ya P

rad

esh

0

Sa

tpu

raC

hh

ind

wa

raS

eo

ni

Don

ge

rga

rh

Bir

sin

gh

pu

r

Am

ark

an

tak

Ko

rba

(W)

Ko

rba

(E)

Ba

ng

o

Ma

ne

nd

rag

arh

Bh

ilai

Ba

lag

ha

t

Pe

nch

KS

TP

SV

ST

PS

Birsi

ngh

pu

r J

aba

lpur

Na

rsin

gh

pu

r I

tars

i S

atp

ura

Ko

tmik

ala

Am

arw

ara

61

15

47

41

36

86

66

657

7

75

23

02

2

71

71

21

5

14

22

10

0

51

8

10

1

(Fig

ure

sh

ow

s lin

e le

ng

th in

Km

)


LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Exh

ibit

- 2

/S

cen

ari

o 3

Sce

na

rio-

III

: S

tart

up f

rom

Gu

jara

t

Ma

ne

nd

rag

arh

Ko

rba

( w

)

Am

ark

an

tak

Ste

p N

o1

23

45

67

Aso

jIn

do

reB

urw

ah

aIt

ars

iS

atp

ura

Jab

alp

ur

Bir

sin

gp

ur(

T)

Ko

rba

( E

)

Ma

dh

ya P

rad

esh

Pe

nch

KS

TP

S

Gu

jara

tC

hh

ind

wa

ra

0

Se

on

i

SS

PN

ag

da

Ind

ira

sag

ar

Ra

jgarh

Ko

tmik

ala

Ba

rgi

10

41

88

74

15

4

27

65

28

97

7

45

66

17

8

86

Am

arw

ara

19

0

71 1

88

Na

rsin

gh

pu

r1

82

14

10

171

61

(Fig

ure

sh

ow

s lin

e le

ng

th in

Km

)


LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Exh

ibit

- 2

/ S

cen

ari

o 4

Sce

na

rio-

4 :

Sta

rt u

p f

rom

Ma

ha

rash

tra

Mo

rwa

Wa

idh

an

Pe

nch

VS

TP

SK

ST

PS

Bir

sin

gh

pu

r

Se

on

i

Ba

nsa

ga

r

Ko

rba

( E

)

Am

ark

an

tak

Na

rsin

gh

pu

rJa

ba

lpu

r

Ste

p N

o1

23

45

67

Ka

nh

an

Sa

tpu

ra

Kh

ap

erk

he

da

La

khn

ad

on

e

Ka

lme

shw

ar

Ko

rad

i

Ita

rsi

Ko

rba

( W

) Sa

tna

Ma

ne

nd

rag

arh

8

Ma

ha

rash

tra

Ba

rgi

Ba

ng

o

0

Ch

hin

dw

ara

Am

beja

ri

Ko

tmik

ala

Ma

dh

ya P

rad

esh

36

27

18

2

8 23

3

22

10

1

74

15

4

66

65

77

71

79

61

10

0

51 76

Am

arw

ara

71

16

52

61

0

14

21

5

52 20

43

68

85

13

14

9

Pa

nd

urn

a

LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Exh

ibit

- 2

/ S

cen

ari

o 4

Sce

na

rio-

4 :

Sta

rt u

p f

rom

Ma

ha

rash

tra

Mo

rwa

Wa

idh

an

Pe

nch

VS

TP

SK

ST

PS

Bir

sin

gh

pu

r

Se

on

i

Ba

nsa

ga

r

Ko

rba

( E

)

Am

ark

an

tak

Na

rsin

gh

pu

rJa

ba

lpu

r

Ste

p N

o1

23

45

67

Ka

nh

an

Sa

tpu

ra

Kh

ap

erk

he

da

La

khn

ad

on

e

Ka

lme

shw

ar

Ko

rad

i

Ita

rsi

Ko

rba

( W

) Sa

tna

Ma

ne

nd

rag

arh

8

Ma

ha

rash

tra

Ba

rgi

Ba

ng

o

0

Ch

hin

dw

ara

Am

beja

ri

Ko

tmik

ala

Ma

dh

ya P

rad

esh

36

27

18

2

8 23

3

22

10

1

74

15

4

66

65

77

71

79

61

10

0

51 76

Am

arw

ara

71

16

52

61

0

14

21

5

52 20

43

68

85

13

14

9

Pa

nd

urn

a

(Fig

ure

sh

ow

s lin

e le

ng

th in

Km

)


215

LE

GE

ND

:

Sta

tion to s

elf-

start

Hyd

ro

Therm

al

Nucl

ear

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rnate

Path

Exh

ibit

- 2

/S

cen

ari

o 5

Sce

nario-

V :

Sta

rt u

p f

rom

Nort

hern

Reg

ion(N

R)

Ma

dh

ya P

rad

esh

Ste

p N

o1

23

45

67

0

Sin

gra

uli

Rih

an

d

NR

Bu

s a

t

HV

DC

Vin

dh

yach

al

An

pa

raM

orw

aWa

idh

an

Am

ark

an

tak

VS

TP

S

KS

TP

S

NR

Bir

shin

gh

pu

r(T

)

Mala

npur

G

walio

r B

ina D

am

oh K

atn

iA

ura

yia

Sa

tpu

raIt

ars

iB

ho

pa

l

Ko

ta

Mo

da

k

Ba

do

dU

jjain

Ind

ore

Ind

ira

Sa

ga

r

3

71

14

86

1

71

24

6

13

5

16

5

44

10

98

19

915

18

07

81

88

37

85

38

11

5

11

7

15

8

26

Sa

ga

r

(Fig

ure

show

s lin

e le

ngth

in K

m)

21

5


CHAPTER – 6


FOR

CHHATTISGARH

In case of total Black out in Chhattisgarh system, the following possible scenarios are

recommended for system restoration based on black start facilities available in the state and

availing start up power from outside the state. Enclosed Exhibits show the schematic diagrams

for scenarios and restoration plans based on island approach.

Black start facilities are available at Hydro stations at Hasdeo Bango (250 kVA DG Set) and

Korba(E) phase-I. The scenarios include importing of start up power from the neighbouring

states or neighbouring regions. In case of total Black out in Chhattisgarh the following modes of

system activation are recommended to be taken up for early restoration of the state system.

6.1 SCENARIO # 1 : FROM OWN BLACK START SOURCES

A. Hasdeo Bango hydro power station (3 x 40 MW)

250 kVA DG set is available at Hasdeo Bango hydro power station. After starting the set,

auxiliary power to any one of the three units can be fed. The start-up power to Korba (E) shall

be extended through 132 kV Hasdeo Bango- Korba (E) line and to Korba (W) through 220 kV

Korba(E)-Korba(W) lines. After starting of Korba (E) unit (s) and picking up sufficient

generation, start up power to Korba (W) generating station and essential loads including start up

power to BALCO (BCCP) units can be extended.

B. Korba(E) stage-I

1500 kVA DG set is reported to be available at the retired power station of Korba(E) stage –I.

This can be used as an alternative if the above mentioned option (6.1 (A)) fails. After starting of

DG set, the power can be extended to Bango units through 6 MVA 3.3/132kV transformer.

Regular trial runs are reported to be carried out on the DG set.

6.2 SCENARIO # 2 : FROM MADHYA PRADESH

A. Through 220kV Amarkantak-Kotmikala-Korba(W) D/C.

Power can be availed from Amarkantak through 220kV Amarkantak-Kotmikala-Korba (W) line

to start the units at Korba(W) and also extends the same to Korba (E) and KSTPS. In spite of

difficulties like high voltage problem, the path can be utilized as an important option during

recovery stage.

6.3 SCENARIO # 3 : FROM EASTERN REGION

A. Through 220 kV Budhipadar-Korba(E) D/C or 220 kV Budhipadar-Raigarh S/C

Korba(E) will make the necessary arrangements to receive the power from Orissa through

220kV Tarkera-Budhipadar-Korba(E) path or from IB-TPS through 220kV IB-Budhipadar-


Korba(E) lines or from Vedanta TPS through 220kV Vedanta-Budhipadar-Korba(E) lines in

case ER survives. Start up power can be extended from Budhipadar to Korba(E) on one of the

220kV Budhipadar-Korba(E) D/C lines and Budhipadar-Raigarh-Korba(E) S/C with resuming

some load at Raigarh along the path if voltages are high. Once the units at Korba(E) start

generating power, the start up power can be extended to Korba(W), KSTPS, Sipat and

BCPP(Balco). Reasonable loads should be connected at Raigarh before extending power from

Korba(E) to Korba(W) to avoid over voltage condition.

B. Through 400kV Rourkela-Raigarh D/C

When ER grid is surviving and voltage at 400kV Rourkela is within permissible limit, power

can be availed from Rourkela to Raigarh through 400 kV link and then to Raipur -Bhilai-

KSTPS or through 220 KV Raigarh-Korba (E) – Korba (W) route or 220 kV Raigarh –

Budhipadar – Korba (E) – Korba (W) route or 400 KV Raipur –Pathadi – KSTPS route. Before

this operation, suitable loads should be connected at Raigarh, Raipur, Urla, Bhilai & Bhatapara

by charging 220kV lines to bring Raipur voltage to safe limits and provide enough anchoring.

During this course, survival power to Sipat, KSTPS, and other IPPs in that area like

JPL(Tamnar), Pathadi, NSPCL etc. can be catered depending upon the quantum of power

available. 400 kV Ranchi – Sipat lines can also be used in similar manner as per the condition of

availability of power and voltage condition at Ranchi end.

6.4 SCENARIO # 4 : FROM NORTHERN REGION THROUGH VINDHYACHAL

HVDC (when MP grid is also under partial/total blackout)

Korba(E) and Korba(W) will avail power from KSTPS (out of NR assistance as indicated in

para 9.2.1 of Chapter 9.

6.5 SCENARIO # 5 : START UP POWER FROM SOUTHERN REGION

A. Through AC Bypass link at Bhadravati HVDC Back-to-back

WRLDC shall arrange for 100 MW start up power from SR on HVDC bypass link at

Bhadravati. 70 MW start up power can be extended to Chandrapur power station of Maharashtra

and 30 MW to Bhilai on 400kV Bhilai-Bhadravati line. Both 400/220kV ICTs at Bhilai will be

charged from 400kV side and 220kV bus charged. 220kV Bhilai would extend power to

Korba(E) and then it can be further extended from Korba(E) to Korba(W). In case of high

voltage problem in charging 400kV Bhilai-Bhadravati, power can be taken on 400kV

Bhadravati-Raipur-Bhilai path taking 80 MVAR bus reactor at Raipur into service.

B. Through HVDC Barsoor - L.Sileru link

There are 220kV D/C lines between Barsoor and LowerSileru (AP) through which minimum 50

MW can be availed in black start condition. However, assistance from AP on this line can only

be availed after availability of AC supply at Barsoor end from other sources. This path can be

used to feed loads connected to Barsoor, but it would be difficult to extend startup power further

to any power stations of Chhatisgarh. Further, this HVDC link is not operational and this path

has not ben tried.


6.6 CONCLUSION:

Priority No.1: Startup power from Bango hydel plant and extending same to Korba(E) on

132kV path and to Korba(W) on 220kV path from Korba(E).

Priority No.2: Startup power from Budhipadar through Korba(E)- Budhipadar line and taking

Raigarh loads to control overvoltage conditions.

Priority No.3: Startup power to Korba(W) can be extended from KSTPS after availing power

from VSTPS (power extended from NR). Korba(E) may be extended power after atleast one

210MW unit at Korba(W) comes on bar.

Priority No.4: Power can be availed from Amarkantak through 220 kV Amarkantak-Kotmikala-

Korba West line. Korba West receives the power to start the units at Korba West and extend the

same to Korba East.

6.7 CHHATTISGARH SYSTEM - IDENTIFIED GRID PATH FOR START-UP

POWER TO POWER STATIONS WHERE STARTUP SOURCE IS NOT

AVAILABLE

KSTPS

Path I 400kV Vindhyachal-Korba D/C

Path II 132kV Bango-Korba(E)-through 132/220kV ICT at Korba(E) – 220kV

Korba(E)-Korba(W) and then through ICT and 400kV Korba(W)-

Korba(NTPC) S/C

Path III 220kV IB-Budhipadar-Korba(E)-Korba(W) and then through ICT and

400kV Korba(W)-Korba(NTPC)

Korba (E)

Path I From Bango HEP through 132kV Bango-Korba(E) or preferably

through 132kV Bango-Jamnipali-Korba(E).

Path II Korba(W) TPS through 220kV Korba(W)-Korba(E) inter connector

feeders (three circuits)

Path III Amarkantak TPS through 132kV Amarkantak-Manendragarh-Bango-

Korba(E) lines

Path IV 220kV IB-Budhipadar-Korba(E)

Path V 220kV BALCO(BCPP)-Korba(East) D/C

Korba (West)

Path I Hasdeo Bango - Korba(E) to Korba(W)


Path II Korba East TPS through 220kV Korba(E)-Korba(W) inter- connector

(three circuits.)

Path III Amarkantak(TPS) through 220kV Amarkantak-Kotmikala-

Korba(W).

Path IV 220kV IB-Budhipadar-Korba(E)-Korba(W)

Path V KSTPS(NTPC) through 400kV KSTPS(NTPC)-Korba(W) line

Lanco(Pathadi):

Path I 400kV Korba(NTPC)-Pathadi S/C

Path II 220kV Budhipadar-Raigarh(Chhattisgarh)-Raigarh(PG)-400 kV

Raigarh-Raipur-Pathadi.

JPL(Tamnar):

Path I 220kV IB-Budhipadar- Raigarh(Chhattisgarh)-JSPCL-JPL(Tamnar).

Path II 400 kV KSTPS-Pathadi-Raipur-JPL(Tamnar)

Path III 400 kV KSTPS-Bhatapara-Raipur-JPL(Tamnar)

NSPCL:

Path I 400 kV KSTPS-Pathadi-Raipur-NSPCL

Path II 400 kV KSTPS-Bhatapara-Raipur-NSPCL

Sipat :

Path I 400 kV Raipur-Sipat

Path II 400 kV Ranchi-Sipat

Path III 765 kV Seoni-Bilaspur-Sipat

ACBIL :

Path I 765kv Sipat-Bilaspur-ACBIL

Path II 765 kV Seoni-Bilaspur-ACBIL

***


Exhi

bit -

3 /

Scen

ario

1

Stat

ion

to S

elf -

Sta

rt

Scen

ario

- I :

Blac

k St

art S

ourc

es

Hydr

o

Ther

mal

Sub-

Stat

ion

400

KV

220

KV

132

KV

Alte

rnat

e Pa

th

Step

No

12

34

56

7

Chha

ttisg

arh

80

Bang

oKo

rba

( E )

Korb

a(W

)

Amar

kant

ak

Birs

ighp

ur(T

) Satn

a

Bans

agar

Jaba

lpur

Balco

(BCC

P)

Kotm

ikala

(Fig

ure

show

s lin

e le

ngth

in K

m)

51

810

161

71

233

76

3

182


LEG

EN

D:

Sta

tion

to s

elf-

star

t

Hyd

ro

The

rmal

Nuc

lear

Sub

stat

ions

400

KV

220

KV

132

KV

66 K

V

Alte

rnat

e P

ath

Exh

ibit

- 3

/ Sce

nario

2

Sce

nario

- II

: S

tart

up

from

MP

Kor

ba (

E )

Am

arka

ntak

Ste

p N

o1

23

45

67

Chh

attis

garh

Kor

ba(

W )

Man

endr

agar

h

8

Mad

hya

Pra

desh

Ban

go

KS

TP

S

0

Kot

mik

ala 10

161

14

8

51

2210

0

(Fig

ure

show

s lin

e le

ngth

in K

m)


LE

GE

ND

:

Sta

tion to s

elf-

start

Hyd

ro

Therm

al

Nucl

ear

Subst

atio

ns

400 K

V

220 K

V

132 K

V

66 K

V

Alte

rnate

Path

Exh

ibit

- 3

/ S

cen

ari

o 3

Sce

na

rio I

II :

Sta

rtu

p p

ow

er

fro

m E

ast

ern

Reg

ion

Ko

rba

(E)

Ch

ha

ttis

ga

rh

ER

KS

TP

SR

aig

arh

Bu

dh

ipa

da

rK

orb

a(W

)V

ST

PS

Am

ark

an

tak

Bir

sin

gh

pu

r

Mo

rwa

Ta

rke

ra

Ste

p N

o1

23

45

67

0

Ib T

PS

Vedanta

BA

LC

O(B

CC

P)

Rou

rke

laR

aig

arh

Bh

ata

pa

ra

Wa

idh

an

Kotm

ikala

Raip

ur

Mo

pka

Pa

tha

di

Sip

at

Ran

chi

1812

0

10

77

11

08

14

21

51

0

26

61

10

1

16

5

40

5

71 15

8

83

64

10

02

32

12

14

93

9

3

(Fig

ure

show

s lin

e le

ngth

in K

m)

Dom

a

21

7

16

0


LE

GE

ND

:

Sta

tio

n t

o s

elf-s

tart

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bsta

tio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Exh

ibit -

3 /

Sce

na

rio

4

Sce

na

rio I

V:

Sta

rtu

p p

ow

er

fro

m N

ort

hern

Reg

ion

Ch

ha

ttis

ga

rh :

Ste

p N

o1

23

45

67

0

Sin

gra

uli

Rih

an

d

NR

Bu

s a

t

HV

DC

Vin

dh

ya

ch

al

An

pa

raM

orw

a

Am

ark

an

tak

VS

TP

S

KS

TP

S

NR

Ko

rba

(W)

Ko

rba

(E)

Wa

idh

an

Ko

tmik

ala

(Fig

ure

sh

ow

s lin

e le

ng

th in

Km

)

10

44

15

8

26

16

5

61

10

1

21

53

8


LE

GE

ND

:

Sta

tion t

o s

elf-

sta

rt

Hyd

ro

Th

erm

al

Nu

cle

ar

Su

bst

atio

ns

400

KV

220

KV

132

KV

66 K

V

Alte

rna

te P

ath

Exh

ibit

- 3

/ S

cena

rio 5

Sce

na

rio V

: S

tart

up p

ow

er

fro

m S

outh

ern

Reg

ion

Chhattis

garh

:

Ste

p N

o1

23

45

Bh

ad

rava

ti

Ra

ipur

Bh

ilai

Bh

atp

ara

Ko

rba

(W)

KS

TP

S

Ko

rba

(E)

SR

Ba

ng

o

Mo

pka

Ba

raso

or

L'S

ileru

(AP

)

(Fig

ure

sh

ow

s lin

e le

ng

th in

Km

)

16

64

8

14

83

10

0

23

21

33

3

32

2

Do

ma

51

Gu

nu

r6

518

5


CHAPTER – 7


FOR

MAHARASHTRA

7.1 INTRODUCTION

In case of total Black out in Maharashtra power system, the following possible scenarios are

recommended for system restoration and restoration of the supply in the state based on black

start facilities available in the state and sources of power available from outside the state.

Enclosed Exhibits show the schematic diagrams for scenarios and restoration plans based on

island approach. Considering the availability of black start facility available with TATA

POWER independent simultaneous action need to be taken for utilising the facilities with TATA

POWER and restoration of TATA POWER system (which is enclosed at Annexure- VII). These

procedures are meant for the case of failure of the TPC islanding.

7.2 SCENARIOS

7.2.1 SCENARIO #1 : FROM OWN BLACK-START FACILITIES

A. From Koyna Hydro Power Station:-[Koyna stage I-(4x65MW) and stage-II

(4x75MW)].

Two house generators of 2 MVA and 310 kW are available at Koyna and KDPH power stations.

One unit at Koyna stage-I & II can be started with the help of the house generator & DG sets

and auxiliaries of all other units at these power stations can be supplied. Once the units are

started, the power can be extended to thermal power stations over the transmission lines. The

step by step procedure along with schematic is described below. The transmission paths for

extending start up power are shown in relevant annexures.

Extension of Power supply using Black Start facility at Koyna Power Station

Following steps may be followed to extend power supply using black start facility at Koyna

power station:

1) To hand trip all 220kV outgoing feeders at Koyna (Pophali) sub-station.

2) To start house generator of 2 MVA capacity at Koyna (Pophali) sun-station.

3) To charge auxiliary bus at Koyna power station, start one unit & charge 220kV Bus.

(This will take around 30-40 minutes).

4) To charge 220kV Pophali-Pedambe one circuit (11.3 km).

5) To charge 220/33kV T/F at Pedambe and release 30MW load of Ratnagiri &

Kharepatan.

6) To extend supply to 220kV New Koyna on 220kV Pedambe-New Koyna (11 km)

line and release local load (@10MW).

7) To take second unit on bar at Koyna Power Station.

8) To extend supply to 220kV Lote(P) by charging 220kV New Koyna-Lote(P) line (44

km) and release 20MW load at 220kV Lote s/s.

9) To charge 400/220kV ICT I (315 MVA) at 220kV New Koyna from LV side &

charge 400kV New Koyna Bus.


10) To extend supply to 400kV Koyna Stage-IV S/S. by charging 400kV New Koyna-

StageIV one circuit (14 km). Once the supply is extended to 400kV Stage-IV, 4X250

MW hydro units are available and one of the units can be immediately taken on

condenser mode operation which will be helpful for controlling voltages by

regulating the reactive power requirement.

11) Take one unit at 400kV Koyna Stage-IV on generation mode. The unit can be kept

on minimum (50MW) for about 30-40 minutes and the generation can be increase as

per the requirement.

12) To extend supply to 220kV Dasturi by charging 220kV Lote(P)-Dasturi(29 km) line

and release 20MW load at 220kV Dasturi S/s.

13) To extend supply to 220kV Kandalgaon by charging 220kV Dastruri-Kandalgaon

(44 km) and release load 220kV Kandalgaon as per the requirement.

14) To extend supply to 400kV Dabhol S/S. by charging 400kV New Koyna-Dabhol one

circuit (60 km). This will make available auxiliary supply for RGPPL Generation and

any one of the unit (GT) can be taken in service within one hour.

15) To extend supply to 400kV Jaigad S/S. by charging 400kV New Koyna-Jaigad one

circuit (57 km). This will make available auxiliary supply for Jaigad Power Station.

16) To charge 220kV Koyna (Pophali)-Kandalgaon Circuit and then extend supply to

220kV Kharghar by charging 220kV Kandalgaon-Top Worth-Kharghar Citcuit

17) To take more units on bar at Koyna (Pophali) and charge 220kV Koyna (Pophali)-

Pedambe second circuit.

18) To extend supply to 220kV Uran s/s. by charging 220kV Kharghar-Uran one citcuit

(28 km). Auxiliary supply will be available to Uran (Gas) Power Station.

19) To extend supply to 220kV Karad S/s. by charging 220kV Koyna (Pophali)-Karad

circuit. Loads can be picked up at 220kV Karad as per the requirement to control the

frequency of the energized network.

20) To extend supply to 220kV Kalwa-I S/S.,by charging 220kV Kharghar-Kalwa line

(25.66km).

21) Extend supply to 400kV Karad by charging 400kV New Koyna-Karad one circuit

(60 km) and take 400/220kV 315 MVA one ICT in service.

22) Further 400kV network with single circuit shall be built in Nagothane, Karad,

Lonikand, Kalwa & Padghe substations.

The island so formed, can be controlled using hydro generation of Koyna I & II

@600MW and Koyna Stage-IV @ 560MW (considering two units taken on generation

mode and two units are taken on condenser mode). Based on the availability of units at

Uran, Dabhol & Jaigad Power stations, network shall be further expanded on 220kV &

400kV level which will make the island more strong and stable.


LEGEND:

Transformer:

Generating

station:

400 kV line:

220 kV line:

Stage-IV

Dabhol

Tambati

New Koyna(220kV)

Finolex

ONGC(Panvel)

Kalwa

Colrchem

Padghe

Jindal

Washala

RAYMOND

Nasik

Apta

Kophali(Taloja)

OCIL

Kharghar

HOC

Uran

KhandelgaonDasturi

Lote(P)

IPCL

SPCL

Nagothane

Mahad

KHPTN

KOYNA-3(Pedambe)

New Koyna(400kV)

(4x65MW+4x75 MW) Koyna-1&2

(Pophali)

Karad

220kV

Restoration of Network using Black start facility at Koyna Power

Karad

Ghatghar

Jaigad

Temghar

MalharpathKDPH

Nivlift

PawasONI

(4x80 MW)

(4 x 60MW + 4x108MW +2x120MW)

44

29

72

30

12

16

(60)

26

136

16

25

29

60.3

4523

75

40

13.36.4

37

93

0.7

160

83

59.4

26

11

(14) (72) (120)

11

25

5

79

60

37

29

56

2.8

44

9

67

113

43

4.528

23

88

85

11

66


7.2.2 SCENARIO #2 : FROM GUJARAT

In case of total black out, SLDC Kalwa will contact WRLDC for providing assistance for

auxiliary supply to generating units at Nasik power stations from Navsari on 220 kV Navsari -

Nasik lines. WRLDC will arrange the same by contacting SLDC, Gujarat. Auxiliary supply to

generating units at Tarapur will be availed by TAPS in consultation with WRLDC/LD Jambua

on 220 kV Bhilad – Tarapur / Vapi-Tarapur lines. In order to start the generating units at Nasik,

Tarapur, Uran and Trombay (TPC), about 100 MW power is needed to meet the auxiliary power

requirement.

A) Following actions are to be taken from Tarapur end :

1. It is essential to extend survival/start up power to Tarapur within half an hour of loss of off-

site power supply.The start up path is identified as 220kV Kawas-Navsari-Bhilad-Tarapur. In

case of total power failure at Tarapur (failure of islanding), charging of 220kV Kawas-

Navsari

one circuit should get precedence over 220kV Kawas- Ichhapur S/C line. Start up power has

to

be further extended to TAPS(3& 4) through 220 kV interlink.

2. In case of problems with on-site power sources at Tarapur, it is extremely imperative to

supply survival power to Tarapur to enable controlled and safe shut down of reactors. About

1 MW power is required for this purpose and high priority has to be accorded in supplying

the survival power.

3. Gujarat should ensure the communication healthiness (PLCC) for Kawas- Ichhapur S/C and

Kawas-Navsari D/C lines at Ichhapur,Navsari and Kawas ends.

4. If Maharashtra/Gujarat require start up power, TAPS shall extend start up power.

5. It is also required to keep facilities available at 220kV Boisar substation to connect with

Dahanu in readiness for use under emergency conditions such as for start up power extension

to Tarapur from Dahanu or vice-versa.

6. After availing supply from Navsari, Tarapur would extend about 10 MW to Tarapur Atomic

Power Station (TAPS) for starting their units.

7. Start up power shall be extended to TAPS (3&4) power station through 220 kV line between

TAPS(1&2) and TAPS(3&4).

8. The alternative path could be 220 kV TAPS(1&2) - Boisar(Maharashtra) - Boisar(PG)-

TAPS(3&4).

9. Attempts shall be made to avail start up power from Gandhar through 400 kV Gandhar-

Sugen-Vapi-Boisar-TAPs(3&4). For voltage control, radial load shall be taken at Vapi &

Boisar. With TAPS(3&4) auxuliaries fed as indicated in steps 7 & 8 and 400 kV TAPS-(3

&4) charged, TAPS(3&4) can inject power to the grid.

10. Tarapur(1&2) would extend the supply to Borivali on 220 kV Tarapur - Borivali line.

11. Borivali would be advised to make arrangements for getting supply from Tarapur(1&2).


12. Borivali would extend the supply towards Kalwa on 220 kV Borivali - Kalwa line.

13. Kalwa would be advised to make arrangements for getting supply from Borivali.

14. Kalwa would extend supply to 100 kV side through 220/100 kV ICTs at Kalwa to extend

supply to SLDC Kalwa.

15. Kalwa would extend supply to Apta and Kandalgaon on 220 kV Kalwa - Apta and 220 kV

Kalwa –Kharghar- Kandalgaon lines.

16. Apta and Kandalgaon would be advised to make arrangements for getting supply from

Kalwa.

17. Kalwa would extend supply to Trombay as second source of supply to TATA POWER on

220 kV Kalwa-Trombay lines.

18. Kalwa would extend supply to Nasik on 220 kV Kalwa-Padghe-Nasik line.

19. Apta would extend about 5 MW to Uran.

20. Uran would be advised to make arrangements to avail supply from Apta on 220 kV Uran –

Apta line and gas turbines units at Uran should be started one after another.

21. Kandelgaon would extend supply to Koyna stage I and II to give auxiliary supply to Koyna

hydro units on 220 kV Kandalgaon – Koyna line. Power of about 5 MW should be extended

to Koyna.

22. Instructions should be given to Koyna stage I & II (Pophali) to make arrangements for

availing supply from Khandelgaon to start hydro units one after another. Start up power

would be extended to 220kV New Koyna over 220kV Pophali-New Koyna S/C and then

extended to Koyna-IV over 400kV New Koyna-Koyna-IV line. For voltage control, one of

the Koyna-IV units can be run in synchronous condenser mode(if required).

23. Kandelgaon would extend supply to Bhira Tail Race(TR) to start the unit.

24. Apta would extend supply to Koyna stage-III (Pedambe) for starting the units, if possible.

25. Instructions would be given to Koyna stage-III to avail supply from Apta on 220 kV Apta –

Pedambe line and units should be started if possible. In case power from Pophali is readily

available, then the same should be availed to start Koyna stage III units.

26. If sufficient generation is available at Uran and Koyna, Apta would extend supply to

Chinchwad on 220 kV Apta - Chinchwad line.

27. Instructions would be given to Chinchwad for availing supply from Apta and essential loads

in Pune city like Hospitals, Railways, Water works etc. may be taken into service.

28. Koyna would be advised to extend supply to Karad on 220 kV Koyna - Karad lines. Karad

would make necessary arrangements for availing the supply.

29. Karad would be advised to extend supply to Kolhapur. In case sufficient generation is


available essential loads in Kolhapur city be taken into service.

30. Kolhapur would be advised to extend supply (over 220 kV Kolhapur-Mumbevadi-Halkarni-

Tillari) of about 2 to 3 MW to run Tillari Hydro station, if possible.

31. Karad would be advised to extend supply to Sholapur. In case sufficient generation is

available, essential loads in Sholapur city be taken into service.

B) Following actions are to be taken from Nasik end:

As stated above, WRLDC will arrange supply to Nasik power station via 220 kV Navsari -

Nasik D/C lines by contacting SLDC, Gujarat. The requirement of auxiliary power at Nasik for

one 210 MW unit will be about 20 MW.

1. On getting auxiliary supply from Navsari, units at Nasik would be brought into service. Nasik

would be advised to charge 220/132 kV ICTs at Nasik and extend the supply to Vaitarna

hydro power station.

2. Vaitarna HPS would bring the machine on bar.

3. If sufficient generation at Nasik and Vaitarna is available, then essential loads in Nasik city

should be taken into service.

4. Nasik would be advised to extend supply to Bableshwar on 220 kV Nasik - Bableshwar line.

5. Bableshwar would avail supply from Nasik and 400/220 kV ICT from 220 kV side should be

charged.

6. Padghe would be advised to charge the 400/220 kV ICT at Padghe from 220 kV side and

charge 400 kV Padghe - Bableshwar line from Padghe end.

7. Bableshwar would be asked to synchronise the 400 kV Padghe - Bableshwar line from

Bableshwar end.

8. Bableshwar would extend the supply to Aurangabad. Aurangabad should make arrangements

for getting supply from Bableshwar. If sufficient generation is available, then essential loads

in Aurangabad area should be taken into service.

9. Bableshwar should extend the supply to Chalisgaon. Chalisgaon should make arrangements

for getting supply from Bableshwar. If sufficient generation is available, then essential loads

in Chalisgaon area would be taken into service.

10. Chalisgaon would extend the supply to Bhusawal on 220 kV Chalisgaon - Bhusawal line and

by charging the 220/132 kV ICTs at Bhusawal, an alternate source of auxiliary supply to

Bhusawal could be made available.

7.2.3 SCENARIO # 3(a): FROM M ADHYA PRADESH

In order to start the generating units at Koradi, Khaperkheda, Chandrapur and Parli, WRLDC

will arrange to avail start-up power from Madhya Pradesh (approx. 80MW) to meet the auxiliary

power requirement of these units.


1. WRLDC will contact SLDC, Jabalpur for supply of power from 220 kV Satpura station

on 220 kV Pandurna - Kalmeshwar line or 400kV Koradi-Satpura line based on the

system condition.

2. Kalmeshwar would make necessary arrangements for getting supply from Pandurna. On

getting the supply, Kalmeshwar should extend the same to 220 kV Khaperkheda for

auxiliary power to Khaperkheda units. Khaperkheda would then extend the power to

Koradi for starting the units at Koradi.

3. Koradi should be advised to run 1 or 2 units first and subsequently other units would be

taken into service one after another. Power supply can also be extended to 220kV

Ambazari substation either from Koradi or Khaperkheda.

4. Koradi would be advised to charge one 400/220 kV ICT at Koradi from 220 kV side.

5. If Chhattisgarh is in a position to assist by about 300 MW, then avail the power from

400 kV Bhilai substation on 400 kV Bhilai - Koradi line or on 400 kV Bhilai

Bhadrawati- Chandrapur line .

6. Khaperkheda or Koradi would extend supply to Akola and then to 220kV Wardha

substation.

7. Wardha would make necessary arrangements for getting supply from Koradi or

Khaperkheda and extend the same to 220kV Warora. Warora should arrange to extend

the supply to Chandrapur.

8. Chandrapur would extend the supply to Chandrapur thermal power station(TPS) and one

Chandrapur unit should be brought on bar. By utilising this power, the other units could

be brought into service one after another.

9. Chandrapur would charge the 400/220 kV ICT from 220 kV side and arrangements for

charging 400 kV Chandrapur - Parli should be kept ready.

10. Wardha would make arrangements to extend supply to Pusad on 220 kV Wardha - Pusad

line.

11. Pusad would make arrangements for getting supply from Wardha and extend the same to

Parli on 220 kV Pusad - Parli line.

12. Parli would make arrangements for getting supply from Pusad and extend the same to

Parli TPS for running the units at Parli. With the help of this power, other units at Parli

can be brought into service.

13. Parli would be advised to charge the Western Maharashtra system on 220 kV Parli

Osmanabad- Solapur line.

14. Parli would be advised to charge 400/220 kV ICT at Parli from 220 kV side and then

charge one 400 kV Parli - Chandrapur line.

15. Parli would be advised to charge 400 kV Parli –Solapur- Karad line.


16. Koradi would be advised to synchronise 400 kV Koradi – Bhusawal line.

17. Bhusawal would be advised to charge 400 kV Bhusawal – Bableshwar line from

Bhusawal end.

18. Koradi would be advised to charge the 400 kV Koradi –Khaperkheda line from Koradi

end.

19. Khaperkheda would be advised to charge 400 kV Khaperkheda-Chandrapur line

followed by synchronization at Chandrapur end.

20. Chandrapur would be advised to extend supply to Lonikhand through 400 kV

Chandrapur- Parli - Lonikhand and subsequently 400kV Karad - Lonikhand line to be

charged achieving full normalcy in the system.

21. If supply is available at Itarsi substation , supply may be extended to Dhule on 400kV

Itarsi-Khandwa-Dhule path and some load can be taken at Dhule after observing the

voltage profile. Then Dhule-Bableshwar-Padghe section may be charged.

22. Then Chandrapur-Padghe HDVC lines can be taken into service.

7.2.4 SCENARIO # 3(b): FROM MADHYA PRADESH

1. SLDC, Jabalpur would take initiative to black start Pench units (2x70 MW). If

simultaneous restoration of Madhya Pradesh & Maharashtra systems is desired, one unit

for each state can be used for extension of start-up power.

2. Charge 132kV Pench-Kanhan one circuit. Charge 220/132kV ICT at Kanhan. Supply

some local load of low pf (lag) to control high-voltage problem.

3. Charge 220kV Kanhan-Khaperkheda and energise auxiliary of one unit at Khaperkheda

(preferably unit capable of hot start).

4. Charge 220kV Khaperkheda-Koradi and energise auxiliaries of one unit at Koradi

(preferably unit capable of hot start and of 120 MW capacity.)

5. After synchronisation of one unit at Koradi and one unit at Khaperkheda, it is advisable

to supply some radial loads at Ambazari.

6. Then steps 6 to 22 from section 7.2.3 are to be followed.

7.2.5 SCENARIO # 4 : FROM SOUTHERN REGION

WRLDC will arrange start up power from Southern Region through SRLDC Bangalore to

Maharashtra system through the two possible routes mentioned bellow:

A. Through 400 kV Ramagundam- Bhadravati(HVDC By pass Link)- Chandrapur

Detailed procedures for using AC bypass at Bhadravati HVDC BTB are available at Bhadravati

HVDC. The minimum auxiliary requirement for Chandrapur TPS is 20 MW for each 210MW

unit and 40MW for each 500MW unit. WRLDC will arrange about 40 to 50 MW power from

Southern Region through 400 kV Ramagundam – Bhadrawati(HVDC by pass link)-Chandrapur


path. Once the unit is started at Chandrapur, the rest of the units at Chandrapur and the

neighbouring power stations could be supplied with auxiliary power. In case sufficient power is

available from Southern Region, then about 90/100MW power shall be arranged by WRLDC

from Southern Region and one unit each at Chandrapur, Koradi, Khaperkheda and Parli shall be

provided with auxiliary power simultaneously.

B. Through 220 kV Kolhapur - Chikodi line

In case of non availability of house generator set at Koyna HPS, the minimum power for start-up

may have to be extended from Karnataka. The installed capacity of Tillari and Koyna stage I and

II (Pophali), are 60 MW and 560 MW respectively. Thus considering the auxiliary requirement

of about 0.5%-1% for hydro units, the requirement of auxiliary power for Tillari unit would be

approximately 1 MW and for each stage of Koyna-(I and II), it will be about 1.5 MW.

1. SRLDC would be requested for assistance of about 10 MW power for supplying

auxiliaries of Tillari/Koyna generating units from 220 kV Chikodi substation on 220 kV

Chikodi - Kolhapur line.

2. Kolhapur would be advised to make arrangements for getting supply from Chikodi.

Kolhapur should further extend the same to Karad.

3. Kolhapur would be advised to make arrangements for extending supply to Tillari hydro

station. If possible, Tillari units could be brought into service.

4. Karad would be advised to make arrangements for getting supply from Kolhapur and

extend the same to Koyna Hydro station.

5. With the help of this power 1 or 2 units at Koyna stage I and II should be brought into

service and other units would be brought one after another.

6. Koyna would be advised to extend supply to Pedambe (Koyna stage III) to start Pedambe

machines, if possible. In case it is not possible due to water level problems to start

Pedambe machines, extend supply to Apta. Simultaneously Koyna should be instructed

to extend supply to Khandalgaon on 220kV Koyna-Khandalgaon line. Koyna-stage-IV

units can be taken into service by availing start up power from Koyna-I & II on 220kV

Pophali-New Koyna line and 400kV New Koyna-Koyna-stage-IV line.

7. Khandalgaon would extend the supply to Bhira T.R. to run the unit, if possible. Also

Kandalgaon should extend supply to Trombay via Kharghar-Kalwa-Trombay feeder.

8. Apta would be advised to make arrangements for getting supply from Koyna stage-III.

9. Apta would be advised to extend supply to Uran Gas Station.

10. With the help of this power 1 or 2 units at Uran could be brought into service and other

units would be brought into service one after another.

11. Apta would be advised to extend supply to Kalwa on 220kV Apta- Kalwa line.

12. Kalwa would be advised to make arrangements for getting supply from Apta.

13. Tata(LD) would be advised to avail the supply from Maharashtra Trombay on 220kV

Maharashtra -Tata(1&2)Tie-lines and 220/100kV ICTs.


14. If sufficient generation is available with Tata, essential loads of Bombay city like

Hospitals, Railways and Airport would be taken into service.

15. Kalwa would be advised to make arrangements for getting supply form Apta.

16. Kalwa would extend supply to 100kV side through 220/100 kV ICTs at Kalwa to extend

supply to SLDC Kalwa.

17. Kalwa would extend supply to Trombay as second source of supply to TATA POWER

on 220 kV Kalwa-Trombay lines.

18. Kalwa would extend supply to Nasik on 220kV Kalwa-Padghe-Nasik

line.

19. Padghe would extend supply to BMC Water works.

20. Nasik would extend supply to Nasik Thermal Power Station for running 1or2 units at

Nasik. Other units would be run one after another. If sufficient generation is available

essential loads in Nasik city can be taken into service.

21. Kalwa would extend supply to Borivali.

22. Borivali would make available this supply on 100kV side for TPC as third source of

supply.

23. Nasik would extend supply to Bableshwar on 220kV Nasik - Bableshwar line.

24. Bableshwar would avail supply from Nasik and charge 400/220kV ICT from 220kV

side.

25. Kalwa would be advised to charge the 400/220kV ICT at Kalwa from 220kV side and

charge 400kV Kalwa-Padghe line from Kalwa and synchronise at Padghe end.

26. After charging 400kV Padghe-Bableshwar line from Padghe end Bableshwar would be

asked to synchronise from Bableshwar end.

27. Bableshwar would extend supply to Chalisgaon on 220kV Bableshwar- Chalisgaon

line.

28. Chalisgaon would avail supply from Bableshwar and extend the same to Bhusawal.

29. If sufficient generation is available, Karad would be advised to extend the same to

Sholapur.

30. Sholapur would be advised to keep ready 220kV Sholapur-Osmanabad-Parli line for

extending supply to VKM system.

31. Bhusawal would extend supply to Bhusawal Thermal Power Station for running one unit

at Bhusawal. With this power, the other units at Bhusawal may be brought in service.


32. Karad would be advised to charge 400/220kV ICT from 220kV side and energise 400 kV

Karad-Sholapur-Parli line from Karad end.

7.3 RESTORATION PROCEDURE FOR TATA POWER SYSTEM

Detailed restoration procedures for Tata Power system is enclosed at Annexure-VII.

Alternative power supply to Tarapur can be given from 100kV Borivali(TATA) substation in

case Tata system is not separated(islanded) or Tata system is already connected to the grid. The

path available is through 100kV Borivali(Tata) to 100kV Borivali (Maharashtra) and then to

220kV Borivali(Maharashtra). From 220kV Borivali to Tarapur through 220kV Borivali-

Tarapur S/C line. This option has the least priority due to the conditions described above.

7.4 MAHARASHTRA SYSTEM - IDENTIFIED GRID PATH FOR START UP

POWER TO GENERATING STATIONS WHERE STARTUP SOURCE IS NOT

AVAILABLE

TAPS(1&2)

Path I - 220kV Kawas-Navasari-Bhilad-TAPS

Path II - 220kV Borivali-TAPS or 220kV Boisar-TAPS

TAPS(3&4)

Path1 - 400 kV Gandhar-Sugen-Vapi-Boisar- TAPS-3&4

Path II - 220kV TAPS(1&2)-Boiser(Maharashtra)-Boiser(PG)-TAPS(3&4).

Path III - 220 kV Tarapur 1&2 – Tarapur 3&4

Koradi

Path I - From Pench through 132kV Pench- Kanhan- Ambazari D/C and

220kV Ambazari-Koradi D/C.

Path II - Paras through 132kV Paras-Akola- Amaravati-Ambazari-Koradi

Path III - Satpura Power Station through 400kV Satpura-Koradi S/C.

Path IV - Khaperkheda Power Station through 220kV Koradi-Khaperkheda

D/C.

Path V - Chandrapur 400kV S/S through 400kV Chandrapur-Khaperkheda-

Koradi S/C.

Path VI - Bhusawal through 400kV Bhusawal- Koradi / Bhusawal-Akola-

Koradi.

Path VII - Chandrapur 220kV S/S through 220kV Chandrapur-Warora-Wardha D/C

and Wardha-Koradi S/C.


Path VIII - Korba STPS through 400kV Korba STPS-Bhilai- Koradi -

Khaperkheda .

Chandrapur

Path I - Ramagundam TPS through 400kV Bhadravati-Chandrapur- HVDC

Bypass link and 400kV Bhadravati-Chandrapur Q/C

Path II - Koradi through 220kV Koradi-Wardha- Warora-Chandrapur

Path III - From K'kheda through K'kheda-Ambazari-Wardha-Warora-

Chandrapur.

Path IV - Koradi through 400kV Koradi-Chandrapur path.

Path V - KSTPS through 400kV KSTPS-Bhilai-Bhadravati-Chandrapur path.

Path VI - Parli through 400kV Parli-Chandrapur T/C.

Parli

Path I - Eldari through 132kV Eldari-Jintoor-Parbhani-Parli.

Path II - Nasik through 220kV Nasik-Bableshwar-Ahmednagar and 132kV

Ahmednagar-Khandke-Pathardi-Raimoh -Beed-Parli route.

Path III - From Koradi on 220kV Koradi-Wardha-Pusad-Parli line

Path IV - From Khaperkeda 220kV K'kheda-Ambazari-Wardha-Pusad-Parli

Path V - From Chandrapur on 220kVChandrapur-Warora-Wardha-Pusad-

Parbhani-Parli

Path VI - Koyna through 220kV Koyna-Karad-Sholapur-Parli

Path VII - From Tillari through 220kV Tillari-Kolhapur-Karad-Vita-Sholapur-

Parli

Path VIII - KEB through 220kV Chikodi-Kolhapur-Karad-Vita-Pandharpur-

Sholapur-Parli

Path IX - Chandrapur through 400kV Chandrapur-Parli T/C

Bhusawal

Path I - Paras through 132kV Paras-Malkapur-Bhusawal D/C

Path II - Nasik through 132kV Nasik-Manmad-Chalisgaon-Pachora-Bhusawal D/C

or through 220kV Nasik-Bableshwar-Chalisgaon-Bhusawal


Path III - From Nasik on 220kV Nasik-Bableshwar D/C line and 400kV

Bableshwar-Aurangabad-Bhusawal line (or direct line)

Path IV - Koradi through 400kV Koradi- Bhusawal S/C or 400 kV Koradi-Akola-

Bhusawal or 132kV Koradi-Ambazari-Amravati-Akola-Paras-Malkapur-

Bhusawal.

RGPPL(Dabhol)

Path I - 220 kV Koyna-NewKoyna-400 kV New Koyna-RGPPL(Dabhol)

Nasik

Path I - Koyna through 220kV Koyna-Kandalgaon-Kalwa-Padghe-Nasik

Path II - From Uran through 220kV Uran-Apta-Kalwa-Padghe-Nasik.

Path III - Bhusawal through 132kV Bhusawal-Pachora-Chalisgaon-Manmad-

Nasik or through 220kV Bhusawal-Chalisgaon-Bableshwar-Nasik

Path IV - Navsari through 220kV Navsari-Nasik

Path V - Tarapur through Tarapur-Bhilad-Navsari-Nasik

Path VI - Vaitarna through 132kV Vaitarna-Igatpuri-Nasik

Uran

Path I - Koyna through 220 kV Koyna-Apta-Uran

Path II - 220 KV Koyna-Kandalgaon-Kharghar-Uran.

***


Exh

ibit -

4 /

Sce

na

rio

1

Scenario-

I

Pa

dg

he

Na

sik

LG

EN

D:

Sta

tio

n T

o S

elf -

Sta

rt

Hyd

ro

Th

erm

al

Bla

ck S

tart

Su

b-S

tatio

ns

40

0 K

V

22

0 K

V1

10

or

13

2 K

VA

lte

rna

te P

ath

Tro

mb

ay(

T )

Tro

mb

ay 7

A

N.K

oyn

a

Ko

ya

na

-IV

Kh

an

de

lga

on

Tro

mb

ay(M

SE

B)

Ka

lwa

Ste

p N

o1

23

45

67

Ma

ha

rash

tra

:

S

elf S

tart

8

Ura

n

Bo

riva

liT

ara

pu

r

Sh

ola

pu

rP

arl

i

Pu

sa

dW

ard

ha

Till

ari

Po

nd

a

Pa

rbh

an

i

Giraw

li

Ko

rad

iK

'kh

ed

a

Wa

roo

raC

ha

nd

rap

ur

KD

PH

Ko

yn

a-3

Ap

ta

Ka

rad

Ko

lha

pu

r

Eld

ari

Bh

ira

Dh

ara

vi

Jin

tur

Ya

wa

tma

l

Pu

rti

Sa

lse

tte

Bo

riva

li(T

)A

rre

yV

ers

ova

Gh

od

bu

nd

er

Da

ha

nu

09

Vita

(O

sm

an

ab

ad

)

Kh

arg

ha

r

Ta

mb

ati

Da

bh

ol

Kh

op

oli

Bh

ivp

uri

Gh

atg

ha

r

Bu

tib

ori

Kolh

apur

Mum

bevadi H

alk

arn

i T

illari A

mona P

onda

113

44

357

30

64

82

85

26

25.6

45

56

15.4

96

23

160

136

93

46

56

80

56

262

457

Ko

yn

a-(

1&

2)

0.8

Sh

ola

pu

r(P

G)

299

178

11

24

985

49

37

16

11

152

56

80

151

85

17

45

14

16

62

59

20

14

29

29

52

21

12

11

109

29

51

182

Pa

rbh

an

i

(Fig

ure

show

s lin

e length

in K

m)


LE

GE

ND

:

Sta

tion to s

elf-

start

Hyd

ro

Therm

al

Nucl

ear

Subst

atio

ns

400 K

V

220 K

V

132 K

V

66 K

V

Alte

rnate

Path

Exh

ibit

- 4 /

Sce

nario 2

Sce

na

rio

- II

Vaita

rna

Ste

p N

o0

12

34

56

Ma

ha

rash

tra

:

Sta

rt u

p f

rom

Guja

rat

7

Navs

ari

Gu

jara

t

89

10

Bhila

d

Vapi

Bois

or(

MS

EB

)

Dahanu

Tro

mbay

Nanded

Pusa

d

Ward

ha

Waro

raP

arli

Beed

Ahm

ednagar

Kaw

as

Padghe

Kandalg

aon

Tara

pur(

1&

2)

Nasi

k

Boriva

liA

pta

Koyn

a-3

Kara

dT

illari

Bhira

K'k

heda

Kora

di

Bhusa

wal

Chalis

gaon

Bab

lesh

war

Ura

n

L'k

hand

Chandra

pur

(To G

oa)

Kalw

aK

olh

apur

11

12

13

Sola

pur

Purt

i

Bois

or(

PG

)

Tara

pur(

3&

4

Vapi

Gandhar

Tam

bhati

Hin

goli

Nasi

k -

Pach

pct

a -

Bhanderd

hara

-Igatp

uri -

Vaita

rna

Mum

beva

di H

alk

arn

i

T

rom

bay

S

onkh

er

N

eru

l K

harg

har

Khandalg

aon

(132 k

V A

hm

ednagar-

Khandke

-Path

ard

i-R

aim

oh-B

eed)

62

89

96

15.4

56

45

66

23

136

160

11

11

299

182

49

178

21

56

26

56

357

149

92

138

137

80

151

182

244

69

285

35

72

24

115

44

Koyn

a-1

&2

Sola

pur(

PG

)

Parb

hani

Parg

aon

Ale

phat

115

Ako

la

35

40

32

80

3

118

64

18

91

21

31

0.7

320

30.4

171

174

Sugen

26

14

22

85

35

38

101

50

113

81

105

52

49

29

10

816

93

(Fig

ure

show

s lin

e le

ngth

in K

m)


LE

GE

ND

:

Sta

tion to s

elf-s

tart

Hydro

Therm

al

Nucle

ar

Substa

tions

400 K

V

220 K

V

132 K

V

66 K

V

Altern

ate

Path

Exhib

it -

4 /

Scenario

3

Sce

na

rio

- I

II

Pandurn

aS

atp

ura

Ma

ha

rash

tra

Sta

rt u

p f

rom

M.P

.

Ste

p N

o0

12

34

5

Pench

Ma

dh

ya

Pra

de

sh

Kora

di

Malk

apur

Kalm

eshw

ar

Badnera

Akola

Para

sK

'kheda

Kanhan

Bable

sw

ar

Chandra

pur

Am

bazari

Bhusaw

al

Ward

ha

Waro

ra

Pusad

Parli

Kara

d

Butib

ori

67

8

Chalisgaon

Am

ravati

Osm

anabad

Sola

pur

Vita

9

Parb

hani

Purt

i56

220

115

115 4

480

95

21

13

85

149

68

244

156

357

96

26

30

182

Akola

30

85

80

14

56

16

151

44

152

178

299

62

182

46

Giraw

ali

Sola

pur(

PG

)

64

14

52

24

25

26

(Fig

ure

show

s lin

e length

in K

m)


LE

GE

ND

:

Sta

tion to s

elf-s

tart

Hydro

Therm

al

Nucle

ar

Substa

tions

400 K

V

220 K

V

132 K

V

66 K

V

Altern

ate

Pa

th

Exh

ibit -

4 /

Sce

na

rio

4

Sce

na

rio-

IV

Ste

p N

o1

23

45

67

Ma

ha

rash

tra

: S

tart

up f

rom

Ka

rna

taka

8

Ko

lha

pu

rT

illa

ri

Ka

rad

Ko

yn

a-3

Ka

nd

alg

ao

n

Bh

ira

TR

L'k

ha

nd

Ba

ble

sh

wa

r

Bh

usa

wa

l

Ap

taU

ran B

ori

va

liT

ara

pu

r

Pa

dg

he

Nasik

Ka

lwa

Ko

rad

iS

ho

lap

ur

Ka

rna

taka

Th

rou

gh

22

0 K

V K

olh

ap

ur

-C

hik

od

i D

/C

Cha

lisg

ao

n

Kh

arg

ha

r

Pa

rli

Cha

nd

rap

ur

Chik

od

i

0

Tro

mb

ay

Chin

ch

wa

d

Bh

osa

ri

Pu

sa

dP

arb

hani

Nan

de

d

Wa

rora

Wa

rdh

a

Kh

ap

erk

he

da

91

0

Pa

nd

ha

rpu

r

Osm

an

ab

ad

149

Ya

wa

tma

lH

ing

oli

Am

ba

za

ri

Mum

bevadi

Halk

arn

i

Vita

Ta

mb

atiB-D

yin

g

sahara

Urs

e

Cha

ka

n

(Fig

ure

show

s lin

e length

in K

m)

52

56

160

24728

28

22

30

24

69

35

66

24

21

178

49

150

29

105

Pa

rga

on

Ale

ph

at

15

174

62

56

26

96

30

113

80

115 26

85

138

156

56

120

60

16

182

14

357

30

92

82

137

80

151

56

299

110

10

115

Giraw

ali

Khapark

heda

Sh

ola

pu

r(P

G)

Ko

yn

a-1

&2

11

136

11 9

3 28


CHAPTER – 8

RESTORATION PROCEDURE FOR GOA

8.1 Following grid disturbance in Western region, part of Goa connected to Western region

would be affected while part of Goa connected to Southern region would not be affected. As

such, Goa could take more assistance from Karnataka and transfer some of the loads from

WR side to SR side depending upon the size of the assistance.

8.2 Sancole power station would black start their 48 MW GT and feed radial loads. Charge 33kV

Sancole-Verna D/C and restore loads at Verna. Charge 110kV Verna-Ponda D/C and Ponda-

Xeldem S/C. At 110kV Xeldem S/S, supply from Sancole can be paralled with supply from

SR side. This would help in stabilising the area fed by Sancole power station. After

connecting to SR grid, some loads at Xeldem could be restored.

8.3 Since Madgaon is in SR side, power supply to Railways can be ensured.

***


CHAPTER – 9

RESTORATION PROCEDURE

FOR

WESTERN REGION

9.1 INTRODUCTION

In case of total blackout in Western region, assistance could be availed from neighbouring

regions in addition to utilising black start facilities within the region. The various possibilities of

availing start up power from outside sources are described below:

9.2 SCENARIOS

9.2.1 SCENARIO #1: From Northern Region(NR)

A. Through 132kV Vindhyachal-Rihand and 132kV Vindhyachal- Singrauli lines

In case of tripping of all the units at VSTPS and tripping of Vindhyachal- Jabalpur Q/C and

Korba-Vindhyachal D/C lines, supply of start up power from Western region to VSTPS would

be difficult as charging of 400kV lines may not be possible. The requirement of start-up power

of VSTPS is approximately 35 MW for starting station auxiliaries and reviving one unit of 210

MW. The requirement for startup for 500 MW unit is 50 MW. This assistance could be availed

through 400kV HVDC bypass or 132kV Vindhyachal-Singrauli-Rihand lines in case of non

availability of 400kV HVDC bypass. VSTPS would make use of 35 MW to provide survival

power for all the units at VSTPS and starting of one unit. Once one unit at VSTPS starts

generating, other units can be started. If power is available, revival of multiple units can be

attempted depending on the available quantum of power. Depending upon the voltage levels and

availability of machines, 400kV lines from VSTPS can be charged to evacuate the generation

from VSTPS with at least two units synchronized at VSTPS and closing of Vindhyachal-

Jabalpur line should then be attempted.

UTILISATION OF AC BY-PASS LINKS

Inter-regional tie points especially strong inter-connections enable import of substantial amount

of power which can be used to provide start-up power to several power plants in the shortest

possible time. Based on the quantum of assistance, power supply to some essential loads could

also be restored. Other advantage over black start facilities would be stable operation of the

restored part since the same would be connected to strong healthy external system. Two such

major options are through bypass AC links at HVDC back to back stations at Vindhyachal &

Bhadravati. The start up power could be availed within 30 minutes. Further, experience of

restoration from these tie points has been highly encouraging. The core approach has been

followed rather than island approach. The operational procedures for closing and opening of

bypass links are discussed in ensuing paragraphs.

I) 400kV Vindhyachal AC by-pass link

a) Closing of A.C. Bypass link.


In the event of a total blackout in the Western Region, start up power would be obtained

from the Northern Region on Vindhyachal A.C bypass link. As per the existing arrangement

with Northern Region, Western Region can draw 200 MW power from Northern Region

(100MW for VSTPS and 100MW for KSTPS) on this link consequent to a total blackout. The

quantum of power can be increased subsequently on mutual consent. Since this link connects the

two regions using line isolators only, due care is to be taken before its operation while

connecting or disconnecting the two regions. The schematic diagram depicting the set up of

400kV Vindhyachal A.C bypass link is shown at Exhibit-I. The sequence of operation of this

link is as follows:-

1.1 Vindhyachal back-to-back shall initiate action to extend start up power to VSTPS through

the A.C. bypass link as soon as it receives a request from VSTPS. However, the A.C bypass

link shall be closed after receiving confirmation from either of RLDCs.

1.2 VSTPS shall open breakers AWL2-Q and AWL1-Q and confirm the same to HVDC

Vindhyachal.

1.3 HVDC Vindhyachal shall isolate HVDC Block-I and Block 2 by opening breakers Nos.

BIQ11-Q, BIQ21-Q, B211-Q and B2Q21-Q.

1.4 HVDC Vindhyachal shall open breaker ARI-Q of reactor if it is connected to HVDC Bus I

B.

1.5 HVDC Vindhyachal shall ensure that North Bus IA is in energized condition.

1.6 HVDC Vindhyachal shall bypass interlocking scheme of D11 & D21 isolators of bypass

link.

1.7 HVDC Vindhyachal shall close D21 isolator of bypass link.

1.8 Close D11 isolator manually.

1.9 HVDC Vindhyachal shall intimate VSTPS to draw start up power by one of the HVDC

feeders to bus 1B.

1.10 In case of any problem in opening of VSTPS end breakers of HVDCVSTPS feeders,

VSTPS shall request HVDC to open AWL3Q. This procedure shall be followed only under

exceptional conditions. Breaker AWL3-Q shall be opened by HVDC station after getting

clearance from NRLDC. After opening AWL3Q, HVDC station shall close isolators D21

followed by D11 (manually after bypassing interlock). Close AWL3Q thus charging North

bus 1A and West Bus 1B. Then VSTPS shall be asked to take one feeder on West bus 1B

and draw 100 MW start up power.

1.11 VSTPS shall extend startup power to KSTPS by charging one of the 400kV Vindhyachal-

Korba D/C lines.

b) Opening of bypass link

Once the VSTPS-KSTPS part system of WR connected to NR grid is running with the

synchronization of two generating units ( with one preferably 500 MW set) in KSTPS/VSTPS, it

shall be disconnected from N.R by disconnecting bypass links. Active power flow on the bypass

link should be brought to floating condition to the extent possible before opening. Reactive


power import from N.R should also be reduced to bare minimum (by increasing MVAR

generation on KSTPS/VSTPS units) before disconnecting the bypass link. For making the line

floating, generation of KSTPS/VSTPS shall be modulated and if required Vaidhan loads can be

connected on VSTPS.

In case N.R is drawing power on the bypass link from WR, WRLDC shall take the help of

NRLDC for controlling flow on the bypass link alongwith generation reduction on

KSTPS/VSTPS units.

2.1 HVDC Vindhyachal shall obtain permission from NRLDC and WRLDC for disconnection

by opening breaker AWL3Q.

2.2 HVDC station shall open isolator D21 followed by D11.

2.3 HVDC station shall close AWL3Q. The island after separation from N.R shall be

quickly connected to the rest of the W.R grid.

The switching diagram of HVDC back to back substation at Vindhyachal is given below:-.


II. Other options from NR:

a. Through 132kV R.P.Sagar- Gandhisagar lines.

b. Through 220kV Kota-badod and Modak-Badod lines.

c. Through 132kV Anpara(U.P)-Morwa-Amarkantak lines.

d. Through 400kV Bhinmal-Zerda and 400 kV Kankroli-Zerda lines.

e. Through 400 kV Agra-Gwalior D/C lines.

9.2.2 SCENARIO #2 : From Southern Region( S.R.)

a) Through 400kV AC bypass at HVDC BhadraWati and 400 kV Bhadrawati-Ramagundam

D/C lines.The detailed procedures for using AC bypass at Bhadrawati HVDC Back-to-back

station are available with HVDC Bhadrawati sub-station.

Action shall be initiated at HVDC Bhadrawati after receiving intimation from WRLDC,

SRLDC and NLDC.

After receiving request for start-up power from WRLDC,and concurrence of SRLDC and

NLDC for the same,Bhadrawati shall make the following arrangements.

1) Ensure that the line side breakers of Bhadrawati-Chandrapur-quadruple

circuit (Q/C),Bhadrawati-Raipur T/C,Bhadrawati-Bhilai S/C are open from both ends.

2) HVDC system is to be completely isolated from both west and south bus.

3) All filter isolators are to be kept open.

4) South bus at HVDC Bhadrawati has to be in charged condition.

5) Ensure that all the AC bus isolators are closed.

6) Then AC bypass isolators are to be closed.

7) Then one circuit of Bhadrawati-Chandrapur-Q/C has to be charged after consultation

with WRLDC.This will supply startup power to one of the 210 MW units at

Chandrapur power station.

8) Then start-up power can be extended to other units with gradual connection of loads and

build-up of subsystem around Chandrapur station.

9) After Maharashtra system develops into a stable island A/C inter-connection at Bhadrawati

will be opened after reducing the flow on the inter-connection into a minimum value by

adjusting the load and generation of the island.

The schematic diagram of HVDC Bhadrawati substation is given below:-.


B) Through 220kV Kolhapur-Chikodi D/C :-

Detailed procedure for availing start-up power by this route has been described in Chapter- 7

(Sec. 7.2.5(B)) .

9.2.3 SCENARIO # 3: From Eastern Region(ER)

a) Through 220kV Budhipadar-Korba(E) and Budhipadar- Raigarh lines.The detailed procedure

is described under Section 6.3.

b) Through 400kV Rourkela-Raigarh D/C lines. The detailed procedure is described under

Section 6.3.

***


CHAPTER – 10

TRAINING, DRILLS & EXERCISES

Training:

1. Annual workshops on Restoration Procedures, sharing of experience has to be

continuously conducted to increase awareness among all the players in the regional

power system.

2. To understand the restoration process, usage of black start facilities, load build up,

priorities of load restoration, coordination with other agencies, SLDCs will also have to

conduct necessary training.

3. Training at regional level is required to build up coordination, foster team work and

optimize effectiveness and to ensure efficient communication and data transfer.

4. RLDCs are required to conduct role-play sessions and meetings immediately

following an occurrence to identify constraints as well as for SWOT

(Strength,Weakness,Opportunity,Threat) analysis.

Drills:

1. Drills will enable confidence in the preparedness and expose any deficiencies in the

restoration plans.

2. Drills also help in estimating the time required for restoration.

3. Feedback of the drills shall help in improving the restoration plans.

Routine Mock-Exercises:

1. The objective of routine mock-exercises as mandated in the grid cide is to check black

start facilities available in the system for their readiness to function at the time of need.

2. In case black start facilities are not fully ready, then the expected time by which those

facilities will be available for system has to be estimated and intimated.

3. The expected time taken to bring the facility into operation incase of contingency has to

be noted after every mock-drill.

4. Load to be connected at 132kV sub stations can be estimated so as to evolve restoration

plans.

5. Actual time for extension of start up power to generating units can be verified during the

mock-exercises, in case black start facilities in a particular generating station is not

available.

6. Readiness on the part of HVDC stations to use bypass for extending supplies from other

regions can be checked during the mock-exercises.


7. It also helps to check the functioning of relays for islanding schemes at Mumbai, other

nuclear power stations like KAPS/TAPS and other power stations. Availability of UF

relays and other settings in different constituent system are also checked.

8. The availability of inter state and inter regional lines which are not frequently utilized are

also checked during the exercise.

9. Meetings of all constituents have to be conducted routinely to ascertain their

preparedness for black-start and for taking suitable actions as and when required.

***


ANNEXURES


Annexure-I

POWER STATIONS WITH BLACK START FACILITIES

Sl.

No.

Power Station Installed Cap.

(MW)

Unit Type Black Start

Source

Capacity

GUJARAT

1 Ukai (H) 4 x 75 Hydro Diesel 500 kVA

2 Mini Hydro 2 x 2.5 Hydro Diesel 50 KW

3 Kadana 4 x 60 Hydro Diesel 500 KVA

4 Dhuvaran

1 x 107 (68+39)

+ 1 x 112 (72+40)

Gas

Details to

be

furnished

by Gujarat

Details to be

furnished by

Gujarat.

5 GIPCL-I 3 x 32

+ 1 x49

Gas /

Steam

Diesel 141 KW

6

**A.E.Co.

Stn. C

Stn.- D,E,F

and CCPP-

Vatva

StnC:2x30

StnD:120

Stn.E,F(110MW

each)CCPP-

Vatva:100MW

Thermal

(Units-

C,D,E,F)/

Gas(CCPP)

Stn-C

islands

Diesel

Stn.C:15kVA;

Stn.D,E ,F and

CCPP(500 kVA

each)

7 CLPIPL 3x138+1x241 Thermal Natural Gas 3000 kVA

8 Sugen 3x382.5 MW Gas Diesel 2x6MVA

MADHYA PRADESH

9 Gandhisagar 5 x 23 Hydro DG set 100 kVA

10 Birsinghpur 1 x 20 Hydro Battery 220 Volt Battery

11 **Pench 2 x 80 Hydro DG set 250 kVA

12 **Bargi 2 x 45 Hydro DG set 250 kVA

13 Bansagar

Stage-I

3 x 105 Hydro DG set 250 kVA

14 **Indira

Sagar

8x125 Hydro DG set 2x1000 KVA

15 Omkareshwar 8x65 Hydro DG set 2x1010 kVA

16 Bansagar Stage

-III

3x20 Hydro DG set 250 kVA

17 Marhikheda 3x20 Hydro DG set 250 kVA

18 Rajghat 3x15 Hydro DG set 250 kVA

CHHATISGARH

19 **Hasdeo

Bango

3 x 40 Hydro DG Set 250 kVA

20 Korba(E)-

phse-I

Power plant retired but Black start

DG set available and on- load trial

is reported to be carried out

regularly

DG Set 1500

kW(3.3kV)

MAHARASHTRA

21 **Koyna I

& II

4 x 65

4 x 75

Hydro House

generator

2 MVA

22 KDPH 2 x20 Hydro DG set 310 KW


23 Eldari 3 x 7.5 Hydro DG set 6 KW

24 **Uran

(Gas)

4 x 60 (GT)

+ 4x108 (GT)+

2x120 WHR

Gas DG set 4 MW

PH1:412kVA

PH2:450kVA

WH:520kVA

Sl.

No.

Power Station Installed Cap.

(MW)

Unit Type Black Start

Source

Capacity

25 RGPPL Block 1:

640MW+Block 2:

663.54MW+Block

3: 663.54MW

Gas Gas

Turbine

(Frame-6)

35 MW (Under

testing): Details

to be provided

by RGPPL.

26 **Ghatghar 2x125 Hydro DG set 1x1250 kVA

27 Khopoli 3x24+2x12 Hydro DC

Governor &

bearing oil

pumps

DC power (self

start)

28 Bhivpuri 3 x 24 +

2 x 1.5 +2x12

Hydro DC

Governor &

bearing

-do-

29 Bhira 6 x 25 Hydro 1 No.of

500 KVA

house

generator

with water

turbine

500 kVA

30 Bhira PSS 1 x 150 Hydro DG set 500 kVA

31 Trombay 1 x 120 Gas Turbine DG Set 2.5 MW

1 x 60 Steam

Turbine

NTPC

32 Kawas 4 x 106

2 x 116

Gas Diesel 2850 KW

33 Gandhar 3 x 144

+ 1x225

Gas Diesel 2975 KW

NCA

34 **SSP(RBPH

& CHPH)

6x200+5*50 Hydro Diesel 2x1000kVA

** Unit successfully undergone black start mock drill during last one year.

Annexure-II

MINIMUM SURVIVAL / AUXILIARY POWER REQUIREMENT


Power Station Installed

Capacity

(MW)

Survival

power

Auxiliary

Power

Diesel

Generator

Capacity

Synchronis

-ing

Facility

GUJARAT

Ukai (Hy) 4 x 75 100 KW 250 KW 500 kVA Yes

Ukai LBCH 2 x 2.5 5 KW 20 KW 50 KW Yes

Kadana (Hy) 4 x 60 7 KW 200 / 250

KW

500 kVA Yes

Ukai (Th) 2 x 120

+ 1 x 200

+ 2 x 210

1.447

MW

4.5/ 8MW - Yes

Sikka (Th) 2 x 120 500 KW 12 MW 500 KW Yes

Dhuvaran (Th) 1 x 27

+ 4x63.5

+ 2x140

500 KW 5 MW 500 KW Yes

Gandhinagar 2 x 120

+ 3 x 210

175/350

KW P.U

7.2/10.7

MW P.U

500 kVA

D.G.set

Yes

Utran 3 x 15 - - - -

Wanakbori 7 x 210 0.8 MW 13 MW

P.U

3x400 KW Yes

Panandro(KLTPS) 2 x70+2x75 360 KW 4.5 MW 1280 KW &

500 KW

Yes

KLTPS-4 75 300KW 3.5MW 1200KW No

SLPP Phase-II(U-3&4) 2 x 125 - 12MW 750kVA -

A.E.Co.

Stn. C(Thermal) 2 x 30 250 kVA 9 MW 1x500 kVA Yes

Stn.D,E,F(Thermal) 120+ 2x110 (1x125+3x500)

kVA

Yes

GT(Gas) 3x33 - - 500kVA Yes

CLPIPL 3x138+1x241 1 MW 2 MW 3000 kVA Yes

ESSAR 3x110+1x185 - - - Yes

GIPCL(Gas)

Stage-I 3 x 32+1x49 1.5 MW 2 MW 141 KW Yes

Stage-II 1x104+1x56 1x500 kVA Yes

GSEG 2X52+1X52 600 KW 2.2 MW 2x625 kVA -

APL, Mundra 4x330+3x660 5MW 56MW 6x750 kVA Yes

MADHYA PRADESH

Amarkantak 2x120+1x210 135kW

MW

36 MW 750 kVA Yes

Satpura 5 x 62.5

+ 1x200

+ 3x210

800 KW 85 MW 150 KVA +

2x500

kVA+2x500

KVA

Yes

Birsinghpur 4 x210+

1x500

3900

KW

105MW 2x1000+1X

600 kVA

Yes

Jaypee Bina

1x250


Capacity

Surviva

l power

Auxiliary

Power

Diesel

Generator

Synchronis

ing


(MW) Capacity Facility

Indira Sagar 8 x 125 - - 2 x 1.0 MVA -

MAHARASHTRA

Koradi 4 x 115 + 1x

200 + 2x210

1.44

MW

80 MW 2 x 312 kVA +

3x376 kVA

Yes

Khaperkheda 4 x 210 147 KW 19 MW 2 x 500 kVA Yes

Chandrapur 4 x 210

+ 3 x 500

312 KW 39.2 MW 2x 500 kVA +

2 X 376 kVA

Yes

Bhusawal 1 x 58 +

2 x 210

500 KW 23 KW 2 x 250 kVA Yes

Parli 2 x 30

+ 3 x 210

536 KW 31.8 MW 1x87 kVA +

2x312 kVA

2X375 kVA

Yes

Nasik 2 x 140

+ 3x210

1200

KW

54.5 MW 1 x 212 kVA

1x250 kVA

2x412 kVA

Yes

Uran 4 x 60 +

4x108 +

2x120

- 500 KW Nil Yes

Koyna I &II 4 x 65 +

4x75

3 KW 1.055 MW 2 MVA

350 Ampere-

hours(AH).

Yes

Koyna III 4 x 80 - 515 KW Battery set Yes

Koyna IV 4 x 250 - - - -

Ghatghar 2x125 - - 1x1250kVA Yes

TATA POWER

Trombay –4 1 x 150 400 KW 8 MW 1x200 KVA

1x500 KVA

Yes

Trombay-5&6 2 x 500 2000

KVA

40 MW 2 x 1500 KVA Yes

Trombay –

7A&7B

1 x 120 +

1 x 60

200

KVA

200 KVA 1 x 2.5 MW Yes

BSES

Dahanu

2x250 1.5 MW 30 MW for

first unit and

40MW for

both units

2x750 kVA Yes

JSW CPP(JSW) TPP 1x300

CHHATTISGARH

Korba(E)-II 4 x 40=160 381.7

kW

4 MW 1x1.5MW(3.3

kV)at PH-I

Manual

Korba(E)-III 2x120=240 50 kW 5.318 MW Manual

Korba(E)-Extn 2x250=500 25MW per

unit

3x750kVA(1-

for each unit

& 1-set kept

as stand-by)

Yes


Capacity

Surviva

-l power

Auxiliary

Power

Diesel

Generator

Synchronis

-ing


(MW) Capacity Facility

Korba(W) 4 x 210=840 400 kW 4x16 MW 4x 500kVA Auto/manua

l

Hasdeo Bango 3 x 40=120 80 kW 3x500 KVA 250 kVA Manual

N.T.P.C.

Korba STPS 3 x 200

+ 4 x 500

4.94

KW

18 MW p.u

for 200

MW set, 40

MW p.u for

500 MWset

3 x 320kVA

+4x750kVA

Yes

VSTPS-I 6 x 210 15 MW 20 MW/unit 6x500kVA Yes

VSTPS-II 2 x 500

--

40 MW

/unit.

3x1200kVA Yes

VSTPS-III 2x500 -- 40MW/unit. -- Yes

Sipat I 3x660 -- -- Yes

Sipat-II 2x500 -- 40mw/unit -- Yes

Kawas–GT

4 x 106

1.2 MW

1 MW /unit

2700 KW

Yes

Kawas-ST 2 x 116 7 MW /unit

Gandhar –GT 3 x 144.3 1.2 MW 1 MW /unit 2975 KW Yes

Gandhar-ST 224.9 3.2MW 8 MW

N.P.C.

TAPS(1&2) 2 x 160 2 to 3

MW

10 MW/unit 3 x 800

KW(each)

Yes

KAPS(1&2) 2 x 220 5 to 6

MW

14 MW/unit 3 x 2.25

MW(each)

Yes

TAPS(3&4) 2x540 …… ……. 4x2.97

MW(each)

SSP

RBPH and CHPH 6x200+5x50 ------ ------- 2x1000kVA Yes

IPPs

CGPL *3x830 -- Yes

LANCO 2x300 --

JINDAL 4x250 --

*As on 30-11-12

Annexure-III

IMPORTANT SUB-STATIONS PROVIDED WITH SYNCHRONISING FACILITIES

GUJARAT

All 400kV substations and generating stations. In addition to that 220kV Navsari, Gondal,

Ranavav, Jambua, Achhalia, Karamsad, Ranasan, Limbdi and Vav substations also have

synchronizing facilities.

MADHYA PRADESH


400kV : Indore, Sarni, Bhopal, Nagda & Bina.

220kV : Amarkantak, Jabalpur, Itarsi, Sarni, , Bansagar, Tons & Birsinghpur

132kV : Amarkantak, Jabalpur, Bargi, Pench, Gandhisagar,Ujjain,Bansagar Hydro stage-(II ),

(III) and (IV).

CHHATTISGARH

400kV : Bhilai, Korba(W)

220kV : Korba(W), Korba(E), Barsoor

132kV : Korba(E)

MAHARASHTRA*

Sub-station Synchronizing facility is available on following feeders Remarks

Koradi All 400kV feeders

On 220kV side of 400/220kV ICT

Ambazari All 220kV feeders Syn. Facility not

tried since long.

Amravati On 132kV Ambazari I & II

On 132kV Paras I & II

Syn. Facility not

in use since long.

Paras On 132kV Amravati I &II

On 132kV Malkapur I & II

Bhusawal I 132kV Bhusawal 2 circuit-I, II & III

132kV Malkapur circuit I & II

132kV Pachora circuit I & II

Bhusawal II All 400kV feeders

220kV Chalisgaon Circuit I & II

Chalisgaon 220kV Bhusawal circuit I & II

220kV Bableshwar single circuit

132kV Manmad circuit I & II

132kV Pachora circuit I & II

Pachora 132kV Chalisgaon circuit I & II

132kV Bhusawal circuit I & II

Chandrapur All 400kV feeders except 400/220kV ICT

220kV Warora circuit I, 220kV B.C & T.B.C

Sub-station Synchronizing facility is available on following feeders Remarks

Parli-I 132kV Parli circuit I & II

132kV Parbhani single circuit

132kV Nanded circuit I & II

Parli-II All 400kV feeders

400/220kV ICT

220kV Pusad

Not in working

condition

Parli-III 220kV Parli-2 circuit II, III & IV

Eldari 132kV Malegaon feedrs

132kV Jintur feeders

Lonikhand All 400kV feeders

400/220kV ICT

Bableshwar All 400kV feeders

400/220kV ICT-1


400kV TBC & BC

Nagar 132kV Beed feeder

Koyna I & II 220kV Kandalgaon circuit I & II

Karad 400kV TBC

Solapur-I 132kV Ujjain I & II

110kV Pandharpur I & II

Solapur-II 220kV Karad circuit I & II

220kV Parli circuit I & II

220kV side of ICT I & II

Bhatgar 132kV Vir

132kV Phursungi

Kolhapur-2 220kV Belgaon I & II

Nasik All 220kV feeders

132kV Manmad circuit I & II

Khaperkheda All 220kV feeders by way of synchronising trolley

*Details of synchronizing facilities available at 400

kV Padghe,Nagothane,Kharghar,Kharghar,NewKoyna,

Dabhol,Akola,Chakan,Jaigad and 220 kV

Ghatghar substations are to be furnished by MSETCL.

Powergrid /

NTPC /

NPC/NCA

At all 400kV sub-station (viz., Korba, Vindhyachal,

Sipat. Jabalpur, Bhadravati, Itarsi, Khandwa, Bina,

Gwalior, Wardha, Seoni, Bhatapara, Raigarh, Dehgam,

Raipur, Satna, Jhanor&Sipat.

At 220kV Kawas, Jhanor, KAPP, TAPS,SSP)

IPPs At 400 kV APL-Mundra,Sami,JPL-Tamnar,LANCO-

Pathadi&Jaigad

To be confirmed

by the respective

IPPs/SLDCs

***

Annexure-IV (a)

DETAILS OF TRACTION SUB-STATIONS AND THEIR CONTRACTED MAXIMUM

LOAD IN RESPECT OF CENTRAL/WESTERN RAILWAY.

DC Traction

Sr.No. Name of the traction sub-

station(TSS)/Feeding

point(FP)

Contracted Maximum load

in MVA

TATA Power

1 CST,Mumbai 10

2 Igatpuri 12


3 Mahim 22

4 Vikhroli 7

5 Mahalakshmi 14

6 Badlapur 62

7 Cotton green 3

8 Mankhurd 25

9 Sion 25

10 Andheri 11

11 Borivali 16.5

Maharashtra

1 Chorpuri 2

2 Igatpuri 12

3 Thakurli 10

4 Virar 1

5 Ambernath 2

6 Kalwa 11

7 Panvel 3

8 Parsik 10

9 Vasai Road 5

10 Seawood(Dharave) 5

ACTraction

Maharashtra

1. Igatpuri FP N/A

2 Nasik FP N/A

3 Manmad FP N/A

4 Chalisgaon FP N/A

5 Pachora FP N/A

6 Bhusawal FP N/A

7 Lasalgaon 7

8 Pimperlhed 7

9 Malkapur 10

10 Jalamb 10

11 Akola 10

12 Murtizapur 10

13 Wardha 5



point(FP)


in MVA

14 Warora 2

15 Hinganghat 5

16 Vivekand Nagar 5

17 Butibori 5

18 Dhamangaon 15

19 Badnera 18

20 Katol 2

21 Kalmeshwar 2

22 Palghar 15

23 Gholvad 10


24 Nandurbar 10

25 Nardana 6

26 Dharangaon 6

27 Vasai Road (AC) 9

28 Kanhan 10

29 Bhandra Road 8

30 Amgaon 8

31 Kachawni 8

32 Bhadi 20

33 Wirur 6

34 Panvel 9

35 Kharbo 9

36 Wirur 6

Madhya Pradesh *

1 Hetampur 20

2 Gwalior 24

3 Datia 24

4 Bassi 24

5 Bina 35

6 GulabGanj 20

7 Sukhisewaniyan 22

8 Powerkheda 22.5

9 Obaidullagang 21

10 Harda 17

11 Sehore 9.97

12 Talvadiya 12

13 Khirkiya 10

14 Kala Akhar 13

15 Pandhurna 23

16 Betul 22

17 Ghoradongri 12

18 Multai 14

19 Dongargon 17

20 Burhanpur 15

21 Makronia 20

22 Karhiya Bhandoli 26

23 Bamania 21.97



point(FP)


in MVA

24 Ratlam 13.97

25 Nagda 16.97

26 Naikheri 11.97

27 Maksi 10

28 Mohammedkhera 10.97

29 Lalitpur 12

30 Anuppur 22.5

31 Nowrajbad 30.5

32 Mazgaon Phatak 23

33 Suwasra 15


*MPAKVNL traction substations have also been included in the above list

(for Madhya Pradesh).

Chhattisgarh

1 Dilmili 6.5

2 Kumhorsodra 6.3

3 Kawaragaon 6.5

4 Gidam 7.7

5 Bhansi 7.0

6 Raigarh 16.0

7 Kharsia 9.00

8 Champa 18.0

9 Korba 12.5

10 Akaltara 12.0

11 Bilaspur 21.5

12 Belghana 12.5

13 Pendra Road 24.0

14 Udalkachar 14.5

15 BSPR 7.5

16 Bhatapara 17.5

17 Raipur (Urkura) 17.0

18 Bhilai 15.0

19 Rajnandgaon 12.5

20 Paniajob 16.0

Gujarat

1 Atul 16

2 Bhestan 18.50

3 Madhi 7.00

4 Navapur 8.00

5 Bharuch 17.00

6 Makarpura 18.98

7 Mehmadabad 10.00

8 Anand 9.50

9 Samlaya 12.00

10 Godhra 15.94

11 Gandhinagar 5.00

12 Dahod 21.00

Annex-IV (b)

Details of Power Supply to Railway Traction - Format

S.No Name

of the traction

substati

on

Source

of supply

Neutral section Kms. 132/25kV

Transformer capacity

Contract

Demand (MVA)

Average

demand (MVA)

Emergency

Min.Req. (MVA)

Rail

way Divi

sion

Connected

Phase (R-Y, Y-B,

B-R)

West/ South

East/ North


***

Annex-IV(c)


Annex-IV (d)

Grid Supply Arrangements of SEBs to Western Railway TSS(AC SECTION)

To NDLS

LEGEND:

:Transformer

:Traction sub-station(TSS)

:SEB's Grid sub-station

:400kV Transmission line

:220 kV Transmission line



: 66 kV Transmission line

Source:Traction Distribution Data Book prepared by Energy Management Cell,Railway Board,New Delhi

v

Thuria

Linkheda

MeghNagar

Derol

KhachRoad

Morwani

Chhayapuri

VadodVatva

Kim

Lakhodra

Virar N/S

VadodaraGothaj

Gandhi-Nagar

Khatg

aon

Ahaln

er

Udhna

SuratK

ikakui R

d.

PSO

Chal T

han

Nandurb

ar

Jalg

aon

Amalsad

Karambele

Vangaon

Vasai Rd.

Borivali

Shivpura

Kalisindh

Jabri

Bhopal

Naikheri

Ratadia

Nagda

Dewas Indore

Asoj

To Godhra

Chandrapura

220 kV

Godhra

Samlaya

Dahod

Nagda

Ratlam

Anand

Ode

Maksi

Maksi

Ujjain

Sajapur

Panwari

Asta

Bhopal

From

400 kV Itarsi

Sujalpur132 kV

From Ujjain

Sehore

Mohd. Kheda

Sehore

To Indore

From Ujjain

220kV

MangalyagaonJaspura

Dewas

Ratlam

MeghNagarBamania

Wanakbori(TPS)

Ranasan

Chiloda

Talod

Vatwa

Mehmedabad

Mehmedabad

Thasra

Nadiad

Godhra

Dahod

220 kV Jambuva

Makerpura

Karamsad

Bharuch

Bharuch

AnkaleswarAcchalia

Ukai(H)Ukai(T)Vav

From Asoj(400kV)

From Kakrapar

From Navsari

Karjan

Haldarwa220 kV

66 kV

Madhi Navapur

Singarh

From Ukai(H)

Nandurbar

Nandurbar Nardana

Nardana

Patunga

Dondaicha

SS

P

Kh

an

dw

a

Ba

ble

sw

ar

Bhusawal

Jalgaon

Dharangaon

Dharangaon

From Ukai

66 kV

Surat

Udhna

Bhestan

Valsad

Atul

Vapi

Borivali

Padghe

Bhestan

Atul

NavsariFrom Vav

220kV

TAPS

Dhule

Gholvad

Dahanu Rd.

Palghar Palghar

NallasoparaPadghe

Boisar

To MIDC

Wada

Kamba

Kolshet

100kV

Vasai Rd.(EHV)

110kV MSEB

UG Cable

Vasai Rd

Borivali RS(TATA)

110kV MSEB

UG Cable

Borivali

To Church-Gate

MA

DH

YA

PR

AD

ES

HG

UJA

RA

TM

AH

AR

AS

HT

RA

TA

TA


Annexure-V

Power Supply Arrangement for Traction substation connected with Chhatisgarh,Maharashtra-grid system of Nagpur Division:

(South-East Central Railway)

Acronyms:

SP : Sectioning & Paralleling Post

TSS: Traction Substation

GSS: Grid Substation

SS: Sub-sectioning Post

To Nagpur

Source:Traction Distribution Data Book - prepared by Energy Management Cell,Railway Board,New Delhi

Rasmara SP

132/22kV

Raj-Nandangaon

TSS

MUN SP

132/25 kV

PJB TSS

Salekasa

SP

132/25 kV

AmgaonTSS

Gondia SP

132/25 kV

Kachewani

TSS

Tumsar

Road SP

220/25 kV

Bhandara

Road(BRD) TSS

Tharsa SP

132/25 kV

Kanhan

TSS

Itwari SP

To Howrah

132 kV Raj-

Nandangaon

GSS, Chattisgarh

132 kV Bhilai GSS,

Chattisgarh

132 kV Balaghat GSS,

MadhyaPradesh

132kV Dongargarh

GSS,Chattisgarh

132 kV

Amgaon SS

132 kV

Gondia SS

132 kV

Madgal GSS

220/132kV BRD

GSS,Maharashtra

220/132 kV Kanhan

GSS,

Maharashtra

220 kV

Khaparkheda

Bus,Maharashtra

Chattis

garh

Zone

Mahara

shtr

a Z

one


List of Bus/Tertiary Reactors:

Sr.No Station Name No of reactor X Capacity(MVAr) Total MVAr

Powergrid

1 Bhachhau 1x63 63

2 Bhadravati 1x50* 50

3 BILASPUR 765kV (L/Rs of Ranchi Line) 1x240 240

4 BILASPUR(765 1x240 240

5 Bina 1x63 63

6 Birsinghpur 1x50 50

7 Damoh 1x63 63

8 Dehgam 1x63+1x125 188

9 Dhule 1x80 80

10 Gwalior 1x50 50

11 Itarasi 3x50 150

12 Jabalpur 1x63 63

13 Jabalpur 2x25 50

14 Khandwa 1x125 125

15 Kolhapur(mah) 1x80 80

16 Kolhapur(PG) 1x50* 50

17 Mahan(ESSAR) 1x80 80

18 Mhapusa 1x50* 50

19 Navsari(GIS) 1x63 63

20 Parli 1X63* 63

21 Pune(PG) 1x63* 63

22 PUNE(PG)(L/Rs of A’bad Lines) 2X50 100

23 PUNE(PG)(L/Rs of PARLI Lines) 2X50 100

24 Raigarh 1x63* 63

25 Raipur 1x80* 80

26 Rajgarh(PG) 1x125 125

27 Satna 1x50 50

28 Satna(765kV) 1x240 240

29 SATNA 765kV (L/Rs of SASAN Line) 1x240 240

30 Seoni (L/Rs of Wardha and Bina Line) 2x50 100

31 Seoni(765 kV) 1x240 240

32 Solapur(PG) 1X63+1x50 113

33 Sujalpur 1X63 63

34 Wardha(PG) 1x50 50

35 Wardha(PG) - L/Rs of Wardha-Raipur Line 2X63 126

36 Wardha(PG) 1x50 50

Total 3664

Gujarat

1 Amreli 1x50@ 50


2 Asoj 1x50 50

3 Chorania 1x50 50

4 Hadala 1x50 50

5 Jetpur 1x50 50

6 Kansari 1x50 50

7 Kasor 1x50+1x125 175

8 Mundra(APL) 1x80+1x81 161

9 Sami(APL) 1x50 50

10 Soja 1x50+1x80 130

11 Vadavi 1x50 50

12 Varsana 1x50 50

Total 916

Madhya Pradesh

1 Bhopal 2x25 50

2 Bina 1x50+2X25 100

3 Nagda 2x25+2x50 150

4 Satpura 1x63+2x25 113

Total 413

Maharashtra

1 Bableshwar 2x80 160

2 Bhusawal 1x50 50

3 Dhule 2x50 100

4 Karad 1x80 80

5 Kharghar 1x80 80

6 Koradi 1x50 50

7 Lonikhand 1x50 50

8 Nagothane 1x80 80

9 Padghe 1x80 80

10 Parli 1x50 50

11 Parli 3x30 90

Total 780

NTPC+IPPS

1 Vindhyachal 1x63 63

2 Jhanor 1x50 50

3 Sipat 1x240 240

4 TAMNAR(JPL) 1X125 125

5 GMR-EMCO 1X50 50

Total 528

*As Reported in WR Reactive Power Document 2012

***

Annexure-VI


LINE CHARGING GUIDELINES

DURING RESTORATION

1. All the CBs of all the lines, ICTs, Reactors and other equipments has to be opened first

before starting any action.

2. It must be ensured that the line to be charged is free from any fault i.e faulty line shall

not be charged.

3. Before charging, it must be ensured that communication is available between both ends

and all protections are in service and no protection is by-passed.

4. During restoration, lines of lower voltage levels should be given first priority.

5. The line should be charged from the end with higher fault level so that the the voltage

rise will be less in the charging end as well as in the open end. It may be kept in mind that

the new fault level of the station during disturbed condition may be very low compared to

that of the healthy system because of tripping/isolation of generators and lines.

6. If two buses have almost same S.C level (3-phase) and neither is a generating station,

the line should be charged from the bus with lower voltage.

7. In case one bus is completely dead, charging of line should be done from the other end

and the breaker at the dead bus end should be closed after that.

8. At the charging end, ensure that the voltage do not exceed 410kV (as per charging

instructions related to particular line). Following voltage control measures must be

utilized in full.

• Bus reactors are to be taken into service (in case of low fault level condition, the

fall of voltage may be very high)

• Charging end generators must operate at reduced voltage (less than 1 p.u) and in

lagging p.f mode

• In case of high frequency, the same should be controlled first.

• Taking loads into service

7. At the synchronising end, control of standing phase angle (SPA) to less than 20o would

help in minimising jerk or sudden rush of power leading to further emergency. For

reduction of SPA, the following measures are needed to be taken up.

(i) Reduce at those generators which are sensitive to the SPA.

(ii) Shed loads at selected buses.

(iii) Simultaneous backing down of generation and shedding of load.


(iv) Increase of generation at the sensitive buses. The recommended practice for

synchronizing lines is always through check synchronization relay which

normally is set for 35o above which breaker closing is not permitted. For most of

the lines, SPA < 35 o would suffice. However, in case of lines inter connecting

two major generating stations (Ex. 400kV Vindhyachal-Korba S/C line) it is

prudent to limit the SPA to around 20 degree. However, for the sake of ready

reference on the SPA control and sensitivity, measures to control SPA upto

20degrees have been provided. The measures such as generation reduction, load

shedding etc., suggested for SPA control need not be exercised for upto 35 degrees.

8. Open end voltage should not exceed the voltage level at which O/V protection operates

(generally 110%) of nominal voltage. The open end voltage could be controlled by

reducing the voltage at the charging end. The end with as lower voltage would be ideal

for charging as this minimises the rise of voltage at the open end.

9. If the open end voltage is too high, line charging VARs would increase and it may be

difficult for the charging end to sustain the voltage increase. Ensure adequate voltage

control measures at the charging end to contain high open end voltage. Keep the

charging end voltage as low as possible. It would be also be advantageous to charge all

the transformers at the charging end (to act as bus reactors).

10. While back charging long 400kV lines, the problem of ferro-resonance may occur.

Hence, adequate measures such as taking bus/tertiary reactors in to service and most

importantly some load on the transformer shall be taken.

11. One end is generating station end.

When charging from generating stations during restoration, following a grid disturbance,

care should be taken to ensure that sufficient generation is available and/or connections

with other stations at the charging end to absorb the (leading VARs) reactive power

without difficulty. Before charging, ensure by addition of load preferably or through

excitation control, that these generators are operating at lagging p.f. In case, the

generators are already operating at leading p.f., defer line charging temporarily. Also

ensure that, the generator EHV bus voltages are kept low around 0.9 per unit or even less

by excitation control to ensure less open end voltage rise. The line should be

synchronized preferably at the generating station end.This would help in

a) Checking the healthiness of the line i.e., if the line holds, it will indicate there is no

fault on the line since the line was in “hold” condition.

b) Control of SPA

c) Control of voltage difference

12. Line Reactor is available at one end.

In case, line reactor is available at only one end, it is preferable

a) to charge the line from the end without reactor and synchronize at the end with

reactor.


b) If the line is to be opened, open from the end where line reactor is available.

While charging two islands, it is preferable to charge and synchronise at the generating

stations ends. At least, synchronising end must be a generating station.In addition,

frequency difference should also be checked (0.2 Hz-0.5 Hz.). This would avoid sudden

jerk. Further it is advisable to charge at the end with maximum generation level.

***


Annexure-VII

RESTORATION OF TPC SYSTEM AFTER COMPLETE SHUTDOWN.

(Black Start Procedure-Operating Instructions)

A–1.0 General Guidelines :

The guide lines given below should be followed prior to restoration of TPC system

after complete shut down:

1) All the stations should inspect their 220 KV/110 KV switchyards and faulty equipment,

if any, should be isolated.

2) All the stations should clear their HT buses and open LT breakers of the transformers

including those of Reactors/capacitors if they have not tripped. 220 KV Bus section

breakers at Trombay (B.S.III and IV breakers) need not be opened out. Please note that

no isolator is to be opened while “clearing” the bus.

3) All the breakers on that LT bus from which station auxiliary supply is to be resumed

should be opened out.

4) Other LT breakers (ABCBs) should be opened only if the compressed air pressure and

voltage levels of station battery are satisfactory. These breakers should be opened after

establishing station auxiliary supply.

5) Hydro stations should start initially one set for supplying station auxiliaries independent

of source from the system.

6) Thermal stations should be ready to resume auxiliaries as soon as supply is made

available.

7) Receiving stations should be ready to resume supply as soon as the same is made

available.

8) Auto reclosures on all transmission lines are to be made inoperative.

9) All the system operations should be carried out only in consultation with LD.

10) Voltage levels should be closely monitored and controlled after every switching

operation by taking suitable measures like, charging ICTs/ transformers, resumption of

load etc. in consultation with LD.

11) Synchronism should be always checked before taking any line into service during the

process of restoration.

12) Generating stations shall keep LD updated about availability of generation capacity at

every stage. Receiving stations to carry out load resumption in small increment as per


feeder priority list in consultation with LD. Updated priority list of feeders should be

readily available with the control room staff at the receiving stations.

13) Hydro generating units will be put on governor control, underfrequency load shedding

schemes (discrete and frequency trend relays) will normally be kept in service at

receiving stations. Receiving stations should closely monitor the frequency variations

after resumption of every feeder during the process of restoration.

14) Test charging of suspected faulty line/ equipment will not be carried out till system

stabilizes and interconnection is established with MSETCL.

15) Trombay units 5, 6 & 8 even if they remain on house load, cannot be brought on line as

dead bus closing facility is not available for these units. Hence, priority must be to

establish supply at 220 KV Trombay bus so that units can be synchronised as early as

possible.

A-2.0 RESTORATION :

The initiation of restoration will depend upon the system condition just after

shutdown. The probable considerations in the order are given below:

A) System restoration from Hydro.

B) MSETCL System has not collapsed and is ready to supply power at any of the 110/220

Kv interconnecting tie points, only auxiliary power, restricted power or total

requirement.

SYSTEM RESTORATION FROM BHIRA OLD POWER HOUSE

A1: Bhira Generating Station:

Case I: At 46.5 HZ, Set no 2 or 5 will go on house load.

At 45.0 HZ, the breakers of 110 KV Bhira-Davdi, Bhira- Khopoli line no 2, 220 KV

Bhira-Dharavi line no.7 & 8 will trip by the operation of 'hydro islanding' scheme. All

25 MW sets in service prior to system shutdown would remain on line in synchronism

with each other on 110 KV bus. 220 KV bus will remain charged through 110/220 KV

ICTs. GT-7 will remain back-charged supplying BPSU auxiliaries. Operation Engineer

at Bhira will confirm that:

1) Set no.2 or 5 has come on house load operation and is supplying station auxiliaries.

2) BPSU 11KV generator breaker has tripped and the unit is being shutdown.

3) All the equipment parameters are within the acceptable limits.


4) Governors of all the machines are on speed control mode and the frequency

is within 49.5-50.5 Hz.

5) Voltage Regulators of all the machines are in service and 110 KV bus voltage is

maintained around 85 KV.

Case II: If Bhira has not islanded and has complete station shutdown

Start DG set and restore power supply to Set No. 2/5 auxiliaries & start Set No. 2/5.

Resume auxiliary supply of other sets.

Start other available Sets and synchronise on 110 KV bus.

With this, Bhira station would be ready to extend supply to Khopoli.

A2: Khopoli Generating Station:

LD will inform Khopoli and advice Bhira to charge Bhira-Khopoli line no.2.

Khopoli on observing voltage on the line will take the line in service. Charge DT 5 & 7

and resume auxiliary supply. Start 24MW Unit no 7, 8 and 9. Monitor forebay level.

Khopoli will charge Khopoli-Davdi line, Davdi will take the line in service.

Davdi will charge Bhira -Davdi line, Bhira will check synchronism and take the

line in service.

A3: Bhivpuri Generating Station:

LD will inform Bhivpuri and advice Khopoli to charge Khopoli-Bhivpuri line. Bhivpuri

on observing voltage on the line will take the line in service. Charge Power

Transformer no 1 & 2 and resume auxiliary supply. Start 24MW Unit no 9, 10 and 11.

Start old set no 1 & 4.

1. With this, all the three hydro stations will be in synchronism with each other and

ready to extend auxiliary supply to Trombay and other receiving stations.

2. Khopoli in consultation with LD and after informing Mankhurd and Chembur will

charge 110 KV Khopoli-Mankhurd, 110 KV Khopoli-Chembur line. Khopoli will also

bring all available Units on line and according to available capacity, arrange for

discharge from Lonavla/ Walwhan.


3. Bhivpuri will Inform Ambernath and in consultation with LD charge 110 KV Bhivpuri-

Ambernath line 1.

Take UFR and FTR relays in service with following settings.

UFR Settings

Carnac - 48.6 HZ FTR settings

Parel - 48.6 HZ Borivli – 49.9 HZ, 0.1 HZ/Sec

Mahalaxmi - 48.8 HZ Parel – 49.0 HZ, 0.5 HZ/Sec

Dharavi - 48.8 HZ Dharavi – 49.9 HZ, 0.2 HZ/Sec

Chembur - 49.0 HZ Salsette – 49.0 HZ, 0.5 HZ/Sec

Vikhroli - 49.0 HZ Saki – 49.9 HZ, 0.4 HZ/Sec

Salsette - 49.2 HZ

Saki - 49.2 HZ

Borivli - 49.4 HZ

Malad - 49.4 HZ

Versova - 49.4 HZ

A4: Chembur:

Chembur will observe voltage on 110 KV Khopoli-Chembur line, take the line into service

Charge Power transformer no 3, 4 & 5 and restore auxiliary supply. Transmission division

will resume supply to Panvel camp from 110 KV Khopoli-Chembur line. Chembur after

informing Trombay - A will charge 110 KV Trombay-Chembur line 3.

A5: Trombay:

1. Trombay „A‟ will observe voltage on Trombay- Chembur line 3 and take the line into

service charging 110 KV bus. Trombay will charge DT3, DT4, DT5 and DT6 and restore

auxiliary supply. Trombay „A‟ will inform Trombay „B‟ and charge ICT4.

2. Trombay „B‟ will take ICT4 into service charging 220 KV B.S.I, III and V. Trombay „B‟,

„C‟,7 & 8 will charge ST5, ST6, ST7 & ST8 and proceed for resumption of auxiliaries

and Unit start up. Trombay control rooms will consult LD before taking equipments of

higher capacity (1MW and above) in service.

3. Trombay station A operation engineer in consultation with station B control engineer will

charge ICT – 5.

4. Trombay station B control engineer will observe voltage and close 220 KV breaker of

ICT- 5 thus charging 220 KV bus II, IV & VI.

5. Trombay „A‟ in consultation with LD and after informing Carnac, Parel, & Dharavi will

charge, Trombay-Carnac 2, Trombay-Carnac 3, Trombay-Parel 1, &Trombay – Dharavi 1


A6: Mankhurd:

1. Observe voltage on 110 KV Khopoli-Mankhurd, take the line into service. Charge

Power transformer no 1 & 2 and restore auxiliary supply.

2. Mankhurd will charge 110 KV Parel-Mankhurd line.

A7: Parel:

1. Observe voltage on 110 KV Parel-Mankhurd line and Trombay – Parel line no 1, take the

lines into service. Charge Power transformer no 2, 4, 5, 6, 7, 8 and 9 and restore auxiliary

supply. Resume load as per priority in consultation with LD.

A8: Carnac :

1. Observe voltage on 110 KV Trombay – Carnac line no 2 & 3 and take the lines into

service. Charge Power transformer no 3, 7 and restore auxiliary supply.

2. Back charge Power transformer no 4 and charge 145 KV GIS. Charge Power Transformer

no 8.

3. Charge 33KV BS II from Transformer no 7 and close 33KV BS I-II breaker. Take both

33KV reactors in service to control voltages if required. Resume load as per priority in

consultation with LD.

A9: Dharavi:

1. Observe voltage on 110 KV Trombay-Dharavi 1 and take it into service thus charging 110

KV bus.

2. Charge distribution transformers DT1, 2, 3, 4, 5, 6, 11 & 12. Also Back Charge ICT 7, 8 &

9 for controlling voltages if required. Resume station auxiliaries and resume load as per

priority in consultation with LD.

3. Dharavi in consultation with LD and after informing Vikhroli will charge, Dharavi-

Vikhroli line

A:10 Vikhroli : 1. Observe voltage on 110 KV Dharavi-Vikhroli line and take it into service charging 110

KV bus.

2. Take transformer 1, 2 & 3 into service. Resume station auxiliaries.

3. Resume BMC feeders and other loads as per priority in consultation with LD.


4. Inform Salsette and charge 110 KV Salsette-Vikhroli line.

A:11 Salsette:

.1 Observe voltage on Salsette-Vikhroli line and take it into service charging 110 KV bus.

Resume auxiliary supply.

.2 Back Charge ICTs 1/2/3 and then charge 220 KV GIS bus.

.3 Inform Borivli and charge 220 KV Salsette-Borivli line 1.

.4 Inform BMC, Saki & Kolshet and charge 110 KV Salsette-BMC, Salsette-Saki 3 and

Salsette-Kolshet lines. Resume load as per priority in consultation with LD.

A:12 At Ambernath, Kalyan, Chola:

.1 Ambernath will observe voltage on 110 KV Bhivpuri-Ambernath line1 and take the

line into service charging 110 KV bus. Resume auxiliaries. Inform OFA and charge

110 KV Ambernath-Kalyan line 1. Ask OFA to resume supply.

.2 Kalyan will observe voltage on 110 KV Ambernath-Kalyan line no.1 and take the line

into service charging 110 KV bus. Resume station auxiliaries. Resume Railway load

in consultation with LD. If available Hydro generation at Bhira and Bhivpuri is more

than 200MW then inform Chola and charge 110 KV Chola-Kalyan line 1. Chola will

observe voltage and take the line into service thereby charging the 110 KV bus. Chola

will resume auxiliary supply. Resume load in consultation with LD. Kalyan will inform

LD & Salsette and charge 110 KV Kalyan-Kalwa-Salsette line no. 1 & 2.

.3 Salsette will observe voltage and take Kalyan- Kalwa-Salsette line-1 & 2 into service.

A:13 Saki, Kolshet and BMC:

.1 Observe voltage on 110 KV Salsette-Saki 3, Salsette-Kolshet and Salsette-BMC lines

and take these lines into service at respective stations charging their respective 110 KV

buses.

.2 Resume auxiliaries at Saki, Kolshet & BMC.

.3 Resume pumping load at BMC and other loads as per priority in consultation with LD.


A:14 Borivli, Malad and Versova:

.1 Take 220 KV Salsette-Borivli line 1 in service charging 220 KV GIS bus.

.2 Take ICTs 1/2/3 in service charging 110 KV bus.

.3 Charge Power Transformer no 1, 2 , 3 & 7

.4 Resume station auxiliaries. Resume load as per priority in consultation with LD.

.5 Charge 110 KV Borivli-Malad line 1. Charge Malad 110 KV bus and take Power

Transformer no 1/ 2 / 3 in service

.6 Resume auxiliaries at Malad.

.7 Charge 110 KV Malad-Versova line 1 and Power Transformer 1. Resume auxiliary

supply at Versova.

.8 Resume load as per priority in consultation with LD.

.9 Charge 22 KV Industries feeder no. 1 and extend auxiliary supply to MSETCL Borivli

with specific instruction that MSETCL should not parallel the supply with any other

source.

A:15 At Trombay :

.1 After auxiliary supply is extended to Trombay unit- 7A, unit will be brought on line

and further restoration will be done simultaneously from hydro stations and Trombay

gas turbine unit.

.2 Trombay unit 7 operation enginer will synchronise unit 7A on 220 KV bus V by

closing 220KV breaker no. 1.

.3 Trombay unit 7 operation engineer will check synchronism & close unit 7A 220KV

breaker no. 2.

.4 Trombay A will resume load as per priority in consultation with LD.


A:16 Transmission lines :

.1 Trombay „A‟ will inform Parel and charge 110 KV Trombay-Parel lines 2 & 4. Parel

will check voltage and take the lines into service.

.2 Trombay „A‟ will inform Chembur and charge 110 KV Trombay-Chembur line no.1/

Transformer no.1.

.3 Chembur will observe voltage and take Trombay- Chembur line no. 1/ transformer 1

into service and extend supply to RCF for essential auxiliaries.

.4 Trombay „A‟ will inform Dharavi and charge 110 KV Trombay- Dharavi line no. 2.

Dharavi will observe voltage and take the line into service.

.5 Trombay „A‟ will inform BARC and charge 110 KV BARC line no. 3 & ask BARC to

take the line into service and restore essential load.

.6 Borivli will charge 110 KV Borivli- Malad line no.2 and Malad- Versova line no.2 and

take them into service.

.7 Bhivpuri will inform Ambernath and charge 110 KV Bhivpuri- Ambernath line 2.

.8 Ambernath will observe voltage and take Bhivpuri- Ambernath line 2 into service.

.9 Ambernath will inform Kalyan and charge 110 KV Ambernath- Kalyan line 2.

.10 Kalyan will observe voltage and take Ambernath- Kalyan 2 into service.

.11 Salsette will inform Dharavi and charge 110 KV Salsette- Dharavi line.

.12 Dharavi on observing voltage will take Salsette- Dharavi line into service.

.13 Salsette will inform Saki and charge 110 KV Salsette- Saki line no. 4.

.14 Saki on observing voltage will take Salsette- Saki line no. 4 into service.

.15 Carnac after informing BEST will charge 110 KV Carnac- Grant Road and Backbay no

1 cable. BEST to resume load in consultation with LD.

.16 Parel will inform Mahalaxmi and charge 110 KV Parel- Mahalaxmi-2 cable.


.17 Mahalaxmi will check voltage and take Parel-Mahalaxmi-2 line into service. Charge

transformer 1 & 3. Resume station auxiliaries. Resume load as per priority in


.18 Kolshet will inform BMC and charge 110 KV Kolshet- BMC line.

.19 BMC will check voltage and take Kolshet-BMC line into service.

.20 Trombay „C‟ will inform Carnac and charge 220 KV Trombay- Carnac line no. 5.

.21 Carnac will observe voltage on Trombay- Carnac 5 and take the line and ICT- 5 into

service.

.22 Trombay „C‟ will inform Salsette and charge 220 KV Trombay- Salsette line no. 1.

.23 Trombay ‟C‟ will inform Dharavi and charge 220 KV Trombay- Dharavi line no. 5.

.24 Salsette on observing voltage on 220 KV Trombay- Salsette line no. 1 will check

synchronism and take the line into service.

.25 Dharavi on observing voltage of 220 KV Trombay-Dharavi line no.5 will check

synchronism and take the line in service. Take ICT no 7, 8, & 9 in service.

.26 Davdi will inform Lavasa and charge Davdi-Lavasa line no 1 with specific instruction

that Lavasa should not parallel the supply with any other source.

.27 Lavasa to take the line in service and Resume load as per priority in consultation with

LD.

.28 The following 220/ 110 KV lines will be taken into service as per the voltage levels.

220 KV Trombay-Carnac line no. 6/ ICT- 6.

220 KV Trombay-Dharavi line no. 6.

220 KV Trombay-Salsette line no. 2.

220 KV Salsette- Borivli line no. 2

110 KV Parel-Grant Road cable.

110 KV Parel-Mahalaxmi- 1 cable

110 KV Dharavi-Mahalaxmi cable

110 KV Trombay-BARC-4


110 KV Trombay-Chembur-2 cable

110 KV Chola-Kalyan line no 2

110 KV Trombay-HPCL-3 & 4 cables

110 KV Mahalaxmi – W. Rly 1 & 2 cables

110 KV Dharavi – W. Rly 1 & 2 cables

110 KV Borivli– W. Rly 1 & 2 cables

110 KV Carnac-Backbay no 2 cable

220 KV Dharavi-Backbay cable

110 KV Carnac- Parel cable

A:17 HYDRO

Bhira:

.1 Bhira will charge 220 KV Bhira-Dharavi line no.7 with 85 KV voltage on 110KV Bus.

Minimum 5 sets are required prior to charging the line.

.2 Dharavi will take the line in service.

.3 Bhira will start BPSU if frequency is stable. BPSU load will be picked up in steps of

10MW keeping watch on frequency. Other Hydro generators will vary load as per

frequency. If required generation can be varied manually.

Note:

1. When Hydro stations and Trombay unit- 7A are operating in parallel, loads at

receiving stations will be restored as per generation availability.

2. Bhira units 1 to 6 and Bhivpuri units 9, 10 & 11 will be kept on “Governor

control” to regulate the islanded TPC system frequency.

3. Khopoli to regulate duct line discharge in consultation with LD.

A:18 TROMBAY .1 Unit no.7 operation engineer will keep “speed load changer” in service as unit would

be supplying isolated system load.

.2 Unit 7 operation engineer will control voltage after every stage by adjusting AVR set

point.

.3 Unit 5, 6, 7B and 8 will be synchronized as and when it is made available.

Note:

.1 Stable load on Trombay Unit 7A should not exceed 100 MW. Unit.7A parameters

(voltage, MW, Mvar and current) should be closely monitored.


.2 Unit 7A should be loaded maximum up to 100 MW capacity only. Margin of 25/

40 MW should be kept for frequency regulation.

.3 Receiving stations not to resume load without LD‟s consent as limited power is

available. Any unauthorized load pick up can result in tripping of the unit on under

frequency protection.

.4 After system with Unit 7A is stabilized at reasonable load, Trombay will start CW

pumps and high capacity motors one by one. Accordingly, loads at receiving

stations will have to be relieved to maintain total load on the unit at around 100

MW.

A:19 Interconnection with MSETCL and R-infra:

.1 Synchronisation with MSETCL will be done at Salsette on 220KV Kalwa-Salsette line

if MSETCL system is stable. TPC system will be interconnected with MSETCL system

at remaining tie points, one by one.

.2 TPC-R-infra interconnection will be established only after TPC-MSETCL systems are

interconnected or one of the 500 MW units is on line.

RESTORATION OF TPC SYSTEM FROM MSETCL SYSTEM

In case Bhira, Bhivpuri and Khopoli have total shutdown along with collapse of entire system

and if MSETCL is in a position to assist TPC at least up to 50/60 MW from one of the

interconnecting tie points, LD will proceed as follows:

It must be ensured from MSETCL that the 220 KV voltage is in the range of 200-230 KV and

frequency is between 49.0 and 51.0 Hz.

B-1.0 Restoration of TPC System from MSETCL-Trombay 220 KV Tie Point

1. LD will confirm with Trombay stations „B‟ , „C‟ , 7 & 8 that 220 KV bus is cleared. (220

KV Bus section breakers on main bus III and IV need not be opened.

2. LD will inform Trombay stations „B‟ , „C‟ , 7 & 8 and in consultation with LD(Kalwa)

advise MSETCL-Trombay to give permissive for closing and charging 220 KV Tata-

MSETCL-Trombay tie lines 1 and 2.

3. Trombay Station „B‟ will close 220 KV tie I breaker at MSETCL Trombay end and check

that voltage has appeared. He would confirm that synchronising selector switch is on


“Auto” position and then close tie 1 breaker to charge 220 KV bus I, III and V. In a

similar way, he will charge 220 KV bus II, IV and VI from 220 KV tie line 2.

4. LD will inform Trombay Station „A‟ and request MSETCL-Trombay to charge ICTs 2 &

3. He will advise Trombay Station „A‟ to observe voltage and take 110KV group breaker

into service.

5. LD will advise Trombay Station „B‟, „C‟, 7 & 8 to resume essential station auxiliaries upto

1 MW for each unit.

6. Trombay unit 7A operation engineer will synchronize unit 7A on 220 KV bus V by closing

breaker no.1.

7. LD will inform Trombay Station „A‟ and advise Trombay Station „B‟ to charge ICT no 4

and 5. Trombay „A‟ will take the ICTs into service.

8. LD will advise Trombay Station „A‟ to charge 110 KV bus, charge DT 3 and 4 and resume

station auxiliary supply for essential auxiliaries upto 1 MW.

9. LD will inform Parel & Chembur and advise Trombay Station „A‟ to charge 110 KV

Trombay-Parel line no. 1 & Trombay-Chembur line no. 3.

10. Chembur will observe voltage on the line & take the line into service. Charge Power

transformer no 3, 4 & 5 and restore auxiliary supply.

11. LD will inform Khopoli and advise Chembur to charge 110 KV Khopoli-Chembur line.

12. Transmission division will resume supply to Panvel camp from 110 KV Khopoli-Chembur

line.

13. LD will advise Khopoli to observe voltage on 110 KV Khopoli-Chembur line and charge

110 KV bus, resume station auxiliaries, synchronise all sets. Khopoli to regulate duct line

discharge in consultation with LD, monitor forebay level.

14. LD will advise Parel to take the line into service, resume station auxiliaries, and charge 110

KV Parel-Mankhurd line. Parel will charge Mankhurd-Khopoli line after informing

Khopoli.

15. Khopoli to observe voltage on 110 KV Khopoli- Mankhurd line and take the line in

service. Khopoli to charge 110 KV Bhira-Khopoli line no 2 and Khopoli-Davdi line after

informing Bhira & Davdi.


16. Bhira will take Bhira-Khopoli line no 2 in service. Davdi will take Khopoli-Davdi line in

service. Davdi to charge 110 KV Bhira- Davdi line line after informing Bhira. Bhira to

charge 110 KV bus, resume station auxiliaries and synchronise all sets. Bhira will extend

auxiliary supply to BPSU by charging ICT 1 & 2.

17. Davdi will inform Lavasa and charge Davdi-Lavasa line no 1 with specific instruction that

Lavasa should not parallel the supply with any other source.

18. LD will inform Bhivpuri and advise Khopoli to charge 110 KV Khopoli-Bhivpuri line.

19. LD will advise Bhivpuri to observe voltage on the line, charge 110 KV bus from Khopoli-

Bhivpuri line, resume station auxiliaries and synchronise all sets.

20. LD will ask Trombay „C‟ to charge 220 KV Trombay-Salsette line no.1.

21. Salsette on observing voltage will take 220 KV Trombay-Salsette line no.1 in service.

22. Salsette will follow steps given in A:11 and extend supply to Borivli, Saki, Kolshet &

BMC.

23. Saki, Kolshet & BMC will resume auxiliaries and will restore supply as per section A:13.

24. Borivli, Malad & Versova will follow steps as per section A:14 to resume auxiliaries and

will restore supply in consultation with LD.

25. LD will advise Trombay Station „A‟ to charge 110 KV Trombay-Dharavi line no. 1 & 2.

26. Dharavi to take Trombay- Dharavi line 1 & 2 into service, resume station auxiliaries and

charge one feeder to Railways and restore 4/5 MW load.

27. LD will inform Vikhroli and ask Dharavi to charge 110 KV Dharavi – Vikhroli line.

Vikhroli will follow steps A:10 to resume auxiliaries and will restore supply in


28. LD will inform Parel and advise Trombay Station „A‟ to charge 110 KV Trombay-Parel

lines 2 and 4. He will advise Parel to observe voltage on the lines and take them into

service.


29. Parel in consultation with LD and after informing Mahalaxmi will charge 110 KV Parel-

Mahalaxmi line 2. Trombay „A‟ after informing Carnac and in consultation with LD will

charge 110 KV Trombay-Carnac lines 2 & 3. Carnac will then proceed as per section A:8.

Mahalaxmi will take the line into service, resume station auxiliaries and restore supply in


30. LD will inform Ambernath and advise Bhivpuri to charge 110 KV Bhivpuri-Ambernath

line no.1 & 2.

31. LD will advise Ambernath to observe voltage on the lines, charge 110 KV bus through

Bhivpuri-Ambernath lines, resume station auxiliaries.

32. LD will inform Kalyan and advise Ambernath to charge 110 KV Ambernath-Kalyan lines

1& 2. He will advise Kalyan to observe voltage on the lines and take them into service.

Ambernath in consultation with LD will ask OFA to resume supply from 110 KV

Ambernath-Kalyan line 1 or 2.

33. LD will advise Kalyan to charge 110 KV Chola-Kalyan lines 1 & 2. Chola will check for

voltage, take the lines into service and restore essential auxiliary supply.

34. Trombay „C‟ will charge 220 KV Trombay-Dharavi line no.5.

35. Dharavi will observe voltage on Trombay-Dharavi line no.5 and take it in service on 220

KV GIS bus and take all the ICTs in service.

36. Bhira will charge 220 KV Bhira-Dharavi line no.7 with 85 KV voltage on 110KV Bus.


37. Dharavi will take the line in service.

38. Bhira will start BPSU if frequency is stable. BPSU load will be picked up in steps of



39. Dharavi will inform Vikhroli and will charge 110 KV Dharavi-Vikhroli line.

40. Vikhroli on observing voltage will take Dharavi-Vikhroli line in service and restore

auxiliaries.

41. Vikhroli will inform Salsette and charge 110 KV Salsette-Vikhroli line.


42. Salsette on observing voltage will take Salsette-Vikhroli line in service.

43. Loads at all stations are to be restored as per availability of TPC‟s generation and

assistance from MSETCL.

44. Trombay 5, 6, 7B and 8 will resume Auxiliaries and proceed for startup activities.

45. LD will inform R-infra Aarey and advise Borivli to charge 220 KV Borivli-Aarey line no

1.

46. R-infra Aarey to extend Auxiliary supply to Dahanu Units and restore load in consultation

with LD.

47. Restore remaining network as per section A:16

C-1.0 Restoring TPC System from MSETCL Kalwa-220 KV Tie Point :

1. LD will inform Salsette and in consultation with LD (Kalwa) request MSETCL Kalwa to

charge 220 KV Kalwa-Salsette line No.3 & 4.

2. Salsette will observe voltage on the lines and take them into service. Salsette will charge

ICT no 1, 2 & 3. Salsette will resume station auxiliaries.

3. LD will confirm from Trombay Station „B‟, „C‟ 7 and 8 that 220 KV bus is cleared. (220

KV Bus section breakers on main bus III and IV need not be opened).

4. LD will inform Trombay `C‟ & advise Salsette to charge 220KV Trombay-Salsette line no

1 & 2.

5. Trombay `C‟ to observe voltage and take the lines in service. Trombay B, C, 7 & 8 to

charge ST 5, 6, 7 & 8 and resume station auxiliaries up to 1MW. Trombay control rooms

to consult LD for starting auxiliaries above 1MW.

6. LD will inform Trombay A and advise Trombay B to charge ICT no 4 and 5. Trombay A

to observe voltage and take the ICTs in service.


7. LD will inform Kalyan & Salsette and in consultation with LD (Kalwa), request MSETCL-

Kalwa to charge 110 KV Kalwa-Kalyan, 110 KV Kalwa-Kalyan-Salsette line no 1 & 2

lines.

8. LD will advise Kalyan to observe voltage and take Kalwa-Kalyan & Kalwa-Kalyan-

Salsette line no 2 into service.

9. LD will advise Salsette to observe voltage and take Kalwa-Kalyan-Salsette line no 1 & 2

into service.

10. LD will inform Kalyan to charge 110 KV Chola-Kalyan line no. 1 & 2. Chola will observe

voltage, take the lines into service and resume essential auxiliaries.

11. LD will inform Ambernath and advise Kalyan to charge 110 KV Ambernath-Kalyan line

no 1 & 2.

12. Ambernath to observe voltage and take the lines in service. Charge Power Transformer no

1, 2 & 4. Resume station auxiliaries. Inform OFA to resume supply.

13. LD will inform Bhivpuri and advise Ambernath to charge 110 KV Bhivpuri-Ambernath

line no1 & 2.

14. Bhivpuri to observe voltage and take the lines in service. Charge Power Transformer no 1

& 2. Resume station auxiliaries. Start & Synchronise all the Units. Charge Khopoli-

Bhivpuri line after informing Khopoli.

15. Khopoli will observe voltage on the line, charge 110 KV bus through Khopoli – Bhivpuri

line, Charge Distribution Transformer no 5 & 7. Resume station auxiliaries. Start &

Synchronize all the Units.

16. . Khopoli to charge 110 KV Bhira-Khopoli line no 2 and Khopoli-Davdi line after

informing Bhira & Davdi. Bhira will take Bhira-Khopoli line no 2 in service. Charge 110

KV bus, resume station auxiliaries and synchronise all sets. Bhira will extend auxiliary

supply to BPSU by charging ICT 1.

17. Davdi will take Khopoli-Davdi line in service. Davdi will inform Lavasa and charge

Davdi-Lavasa line no 1 with specific instruction that Lavasa should not parallel the supply

with any other source.

18. LD will inform Dharavi and advise Salsette to charge 110 KV Salsette-Dharavi line.


19. LD will advise Dharavi to observe voltage on the line, charge 110 KV bus through

Salsette-Dharavi line, resume station auxiliary supply.

20. LD will inform Trombay and advise Dharavi to charge 110 KV Trombay-Dharavi line

No.1 and 2.

21. LD will advise Trombay Station „A‟ to observe voltage on the lines, take the lines into

service.

22. Trombay will bring unit 7A on line and synchronise the same on 220 KV bus V by closing

220KV breaker no.1

23. LD will inform Carnac, Parel and ask Trombay „A‟ to charge 110 KV Trombay-Carnac 2

& 3, 110 KV Trombay-Parel 1 2 and 4 lines.

24. Parel on observing voltage will charge 110 KV bus & resume station auxiliaries and after

informing Mahalaxmi will charge 110 KV Parel-Mahalaxmi line 2. Parel will charge

Railway feeders in consultation with LD. Carnac will then proceed as per Section A:8 and

Mahalaxmi will check voltage and take Parel-Mahalaxmi-2 line into service. Charge

transformer 1 & 3. Resume station auxiliaries. Resume load as per priority in consultation

with LD.

25. LD will inform Khopoli and advise Chembur to charge 110 KV Khopoli-Chembur line.

26. Khopoli to observe voltage on 110 KV Khopoli-Chembur line and take the line in service.

27. LD will advise Parel to charge and take 110 KV Parel-Mankhurd line in service. Parel will

charge Khopoli – Mankhurd line after informing Khopoli.

28. LD will inform BMC, Saki & Kolshet and advise Salsette to charge 110 KV Salsette-

BMC, Salsette-Saki 3 and Salsette-Kolshet lines. Kolshet, Saki, BMC and Borivli, Malad,

Versova R/S will follow steps A:13 to A:14 and Resume load as per priority in


29. Trombay „C‟ will charge 220 KV Trombay-Dharavi line no.5.

30. Dharavi will observe voltage on Trombay-Dharavi line no.5 and take it in service on 220

KV GIS bus and take all the ICTs in service.

31. Bhira will charge 220 KV Bhira-Dharavi line no.7 with 85 KV voltage on 110KV Bus.



32. Dharavi will take the line in service.

33. Bhira will start BPSU if frequency is stable. BPSU load will be picked up in steps of



34. Loads at all stations is to be restored as per availability of TPC‟s generation and assistance

from MSETCL.

35. Trombay 5, 6, 7B and 8 will resume Auxiliaries and proceed for startup activities.

36. LD will inform R-infra Aarey and advise Borivli to charge 220 KV Borivli-Aarey line no

1.

37. R-infra Aarey to extend Auxiliary supply to Dahanu Units and restore load in consultation

with LD.

38. Restore remaining network as per section A:16

Loads at all stations will be restored as per availability of TPC’s generation and

assistance from MSETCL.

***


ANNEX-VIII

(Tables-I to VIII)

MONITORING PERFORMANCE

OF

RESTORATION PLANS


Table-I

PERFORMANCE OF ISLANDS IN RESTORATION (Post disturbance analysis)

Sl.

No.

Successful

formation

of

conceived

island

Y/N

(1)

Reasons

for

failure

(2)

Formation of islands not conceived / designed

(3)

Names of

Gen.Stations

in the

islands

220/132kV

load buses

Total

generation

.in the

island

Total load in the

island

Table-I (Contd.)

Sl.

No.

List of

power

station(s)

availed

start up

from this

island

(4)

Start up

path

used

(5)

Any

constraints

in start up

path

*

(6)

Problems

faced by

generators

extending

start up

power

(7)

Time of

synchronization of

this island with other

islands

(8)

Island Time

* Note: Over voltage, phase angle matching (SPA), communication/telemetry, E/S equipment

problems, hunting/oscillations, synchronization problems, protection problems etc.


Table-I (Contd.)

Sl. No. Specify

synchronizing

location

(9)

Is

synchronizing

location pre-

specified

Yes / No

(10)

Problems in synchronization

(11)

Remarks

(12)

SPA HV Frequency

matching

Note: One format for each island is required.

Table-II

EXTENDING START UP POWER TO THERMAL PLANTS FROM BLACK STARTED

HYDRO / GAS UNITS

(Restoration plans & post disturbance analysis)

Sl.

No.

Name of

power

station

black

started

Power

station

availing

start up

power.

Description of auxiliaries Ramp &

Response rate of

black started unit

(w.r.to the largest

auxiliary motor)

MW/Min &

MW/Hz.

Essential

for start up

(a)

Non

essential for

start up (b)

Common

station

loads

(c)

Note: 3: Description of Auxiliary

Name of load Quantum (MW) Type of drive Starting current

Amps.

ID Fan IM

FD Fan SM

BFP

Note 4: Largest motor (IM) to be started first with minimum of 2 minutes gap between starting

the next motor

Note:- (1) Auxiliary loads to be listed in descending order of capacity (MW)

(2) Details to be available with both power station.


Tabl

e-IV

PER

FOR

MA

NC

E O

F BL

AC

K S

TAR

TED

UN

ITS

(Res

tora

tion

plan

s & p

ost d

istur

banc

e ana

lysis

)

Gen

erat

i

ng u

nit

Rem

arks

for

devi

atio

ns/c

onst

rain

ts

Cap

abili

ties t

o isl

and

on h

ouse

load

Act

ual

perf

orm

ance

of is

land

ing

on C

onst

rain

ts/

Rem

arks

-1-5

-6-7

-8

Hot

star

tup

War

m

star

tup

Col

d

star

tup

Hot

star

tup

War

m

star

tup

Col

d

star

tup

Hot

star

tup

War

m

star

tup

Col

d

star

tup

Not

e:

1) A

ll tim

e to

be m

entio

ned

in h

h:m

m

2) C

l.3, C

l.4 an

d Cl

.8 to

be f

illed

up

as p

er b

lack

star

t man

ual f

or th

erm

al g

ener

ator

s

-3-4

Sr.N

o.Ti

me r

equi

red

for

sync

hron

izat

ion

(Hrs

) *

-2

Act

ual t

ime s

tart

up

pow

er

was

ava

ilabl

e (H

rs)

Act

ual t

ime o

f

sync

hron

izat

ion

(Hrs

)


Table – V

PLANT LOADING

(Post Disturbance analysis) Load pick up (corresponding to freq change of 0.5Hz) may be reported as under . Momentary

voltage drop, if exceeds 20% should be reported under remarks.

S.No. Plant Rating (MW) Load pick up Remarks **

MW Percentage

** Remarks on the method of assessment to be indicated as under:

1. Design/Manufacture‟s specifications

2. Tested

3. Stability load

4. Estimated

5. No information. Table – VI

Performance of Black start facilities (Post Disturbance Analysis)

Sr

No

Power station Capacity

of D.G

set

(KVA)

Time taken

for black

start

(Minutes)

Time taken for

extending

power to the

next

bus (Min.)

Remarks/ Constraints

1.

2.

3.

4.

5.

6.

7.

8.

9.

10


Table-VII

Start up power supply to important power stations (Post disturbance analysis)

Sr

No.

Power

Station

Start up

power

source

Start up

path used

Time at

which start

up power is

available

Is the start

up path pre-

planned

Constraints Remarks

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

Note: Example for restoration following grid disturbance on 30.07.2002 is enclosed.


Table-VII-(Example)

Performance of Black start facilities on 30/7/2002

Sr

No

Power station Capacity

of D.G

set

(KVA)

Time taken

for black

start

(Minutes)

Time taken for

extending

power to the

next

bus (Min.)

Remarks/ Constraints

1. Gandhisagar(H)

5 x 23 MW

100 KVA 2 9 After 41 minutes start up power to Satpura

power stations was extended. Voltage and

MW hunting observed along the 132 kV

start up path to Satpura.

2. Pench (H)

2x80MW

250 KVA 44 54 Start up power extended to Satpura

Power station through 132 kV Pench-

Seoni-Chhinwara-Satpura path. High

frequency problem and voltage hunting

observed. Start up power could not be

extended to Koradi power station of

Maharashtra through 132 kV Pench-

Kanhan line due to excessive voltage

hunting.

3. Bargi (H)

2x45 MW

250

KVA

9 9 Power extended up to Jabalpur. Due to high

voltage problem power supply could not be

extended to Amarkantak. Voltage hunting

also observed when 220kV Amarkantak –

Jabalpur Circuit I is charged.

4. Tons (H)

3x45 MW

250 KVA 16 16 Power supply extended to Satna over 220kV

Tons-Satna line. The unit at Tons tripped 3

times due to tripping of transformer at Satna

on overfluxing.

5. Birsingpur (H)

1x20 MW

220 volt.

Battery

49 - The unit tripped and due to fault in CB

power supply could not be extended further

to Birsingpur TPS.

6. Bango (H)

3x40MW

250 KVA 9 49 Power supply extended to Korba (E) and

Korba (W) power stations. Voltage hunting

reported.

7. Koyna Stage-I

4x70 MW

2000

KVA

39 54 Breaker problem at Kandalgaon S/S delayed

start up power supply to Uran. Due to high

voltage problem start up power could not be

extended to Koyna Stage-IV.

8. Ukai (H)

4x75 MW

500

KVA

62 79 Start up power extended to Ukai TPS

9. Kawas (Gas)

3x106 + 2x110

MW

2700

KVA

14 15 Start up power extended to Navsari 220kV

unit –1B which was black started tripped at

21:21 hrs due to restoration of more load at

Navsari. ESSAR & Kawas power stations

were synchronised at 2113 hrs. and start up

power to Tarapur APS given at 2113 hrs.

10

(a)

Jhanor (Gas)

3x144+ 1x225

MW

3120

KVA

- - The units survived on house load but

tripped on charging of 220kV Jhanor –

Haldurwa line.

(b)

-do- -do- 201 201 Hunting of DG observed while black

starting. Difficulty faced in extending

supply to Halderwa due to breaker problem

at Halderwa end


Table-VII (example) cont…

Start up power supply to important power stations

Sr

No.

Power Station Start up

power source

Start up path used Time at which

start up power

is available

Is the start

up path

pre-

planned

1. Uran Koyna I & II 220kV Koyna-Kandalgaon-Khargar-

Uran

22.5 Y

2. Nasik Koyna 220kV-Uran-Apta-Kalwa-Taps –Nasik 23.57 Y

3. Chandrapur SR supply 400kV Bhadravati-Chandrapur 21.00 Y

4. Koradi SR supply 220 kV Chandrapur –Warora-Wardha-

Koradi

21.28 Y

5. Khaperkheda SR supply 220kV Koradi-Khaperkheda 21.40 Y

6. Bhusawal SR supply 132kV Koradi-Ambazari-Amaravati-

Akola-Paras-Malkapur-Bhusawal

22.40 Y

7. Parli SR supply 220 Kv Wardha-Pusad-Parli 23.30 Y

8. Tarapur Kawas 220kV Kawas-Navsari-Tarapur 21.13 Y

9. Satpura Gandhisagar 132kV Gandhisagar-Ujjain-Shujalpur-

Shajapur-Bhopal-Itarsi-Satpura

20.52 Y

10. Amarkantak NR supply 132kV –Vindhyachal-Waidhan-

Amarkantak

23.10 Y

11. Birsingpur NR supply 220kV Amarkantak-Birsingpur 00.04 Y

12. Korba (E) Bango (H) 132kV Korba (E)-Bango 21.00 Y

13. Korba (W) Bango (H) 220 kV Korba (E)-Korba (W) 21.05/21.37 Y

14. Ukai (Th) Ukai (H) 220 kV Ukai (H)-Ukai (Th) 21.30 Y

15. Wanakbori GIPCL 132kV GIPCL – Nandesari-Asoj

(132kV)-Asoj (220kV)-Wanakbori

20.55 Y

16. Gandhinagar A.E Co. 132kV AE Co. –Sabarmati-Ranasan-

Gandhinagar

21.30 Y

17. Kakrapar Kawas/Essar

Island

220kV Kawas-Navsari-Vav-Kakrapar 23.59 Y

18. Dhuvaran A.E Co. (Gas) 132kV Watva-Dhuvaran - Y

Recovery Procedure for Western Region,Dec 2013 145

Tabl

e-VI

II

Time

Prev

ious

Day

To-d

ay%

Resto

rati

on

Prev

ious

Day

To-d

ay%

Resto

rati

on

Prev

ious

Day

To-d

ay%

Resto

rati

on

Prev

ious

Day

To-d

ay%

Resto

rati

on

Note:

*To b

e com

puted

as pe

r ow

gene

ratio

n +IS

GS dr

awal.

% R

estor

ation

= (T

oday

‟s De

mand

) / (P

reviou

s day

‟s De

mand

)

**M

ay be

disp

layed

on V

DUs t

hrou

gh S

CADA

F

orm

at fo

r Rep

ortin

g Deg

ree o

f Res

tora

tion*

*

Cat

ered

Dem

and*

GUJA

RAT

CHHA

TTIS

GARH

MAD

HYA

PRAD

ESH

MAH

ARAS

HTRA

WR


Annex-IX(i)

Report on the black start of Indira Sagar HPS (unit#5) conducted on 22nd

May,

2011. A proposal for black-start mock exercise was put-forth in the 419

th Operational Co-ordination Committee

Meeting of WR held on 12th January,2011 and an island comprising two units at ISP, block loads at 220/132

kV Neemuch S/S being radially fed through 400/220 kV Nagda S/S was proposed. In view of the concerns of

SLDC, MPPTCL for the high voltage conditions at Nagda in the absence of any reactive support, an

alternative proposal for forming an island with radial load at Jetpura (220/132/33 kV) S/S fed from a black

started unit at ISP through 400/220 kV Indore S/S was made which was finalized.

A detailed procedure for the mock exercise was prepared and finalized in consultation with all concerned on

11th May, 2011. A display for SCADA was prepared for monitoring all the S/S during the mock drill on a

single screen and all SLDCs were advised to get that picture copied to their respective servers for

simultaneous observation.

The black start exercise for Indira Sagar HPS was planned on 22nd

May,2011(Sunday) in consultation with all

concerned.22nd

May,2011 being a Sunday alternative supply to the loads fed from Jetpura 132 kV bus could

be ensured with-out any major constraint. All 33 kV feeders emanating from 220/132/33 kV Jetpura S/S

were identified to be fed from the islanded unit at ISP.

A presentation was made at Indore 400/220 kV substation on 20th May,2011in presence of teams from

WRLDC, SLDC, Jabalpur and 400/220 kV Indore S/S. A second presentation was made the next day (i.e. on

21st May, 2011) at ISP in presence of identified executives from ISP and teams from WRLDC and SLDC,

MPPTCL. Based on the few comments/inputs received during the above two presentations slight

modification was incorporated in the procedure and a final procedure was released and circulated to all

concerned by the evening of 21st May,2011.

A. Preparatory exercises for black start exercise of Indira Sagar HEP (shifting of feeders to

appropriate bus with bus coupler closed):

1. At 220/132/33 kV Jetpura S/S. (Please refer to Fig. 1):

a) After ensuring alternative supply to the loads fed from132 kV Jetpura bus(132 kV NZ-

1&2,Ujjain 1&2,Depalpur1&2 ) these feeders along with the 40 MVA, 132/33 kV transformer

and 160 MVA,220/132 kV ICT-II were tripped from both ends.

b) Then 63 MVA 132/33 kV transformer,160 MVA,220/132 kV ICT-I,220 kV Indore-Jetpura-II

were kept on 220 kV Main Bus-I and all other feeders and ICTs were shifted to the other bus and

opened followed by opening of the 220 kV bus coupler(B/C) at Jetpura.

2. At 400/220 kV Indore S/S.(Please refer to Fig. 2):

a) 220 kV Indore-Jetpura-II and LV side of 315 MVA,400/220 kV ICT-I were kept on 220 kV

Bus-I and other feeders were shifted to 220 kV bus-II at Indore.

b) 400kV Indore-ISP-II and HV side of 315 MVA ,400/220kV ICT-I were kept on 400 kV Bus-I

and all other ICTs/feeders were shifted to 400 kV Bus-II at Indore.

c) Bus-coupler(B/C)kept closed on both 400kV and 220 kV sides.

3. At 400 kV Indira Sagar(ISP) substation.(Please refer to Fig. 3):

a) Unit #5, Unit #6 and 400 kV ISP-Indore-II were kept on 400 kV Main bus-B and all other

feeders and units were shifted to the other bus i.e. 400 kV Main bus-A.Unit #6 was kept as a

stand by to be used for the mock drill in case of failure of unit #5.

b) 400 kV bus coupler (B/C) at ISP was kept closed.


The above mentioned operations were completed by 08:45 hrs on 22nd May, 2011.Then the following

switching operations were done at Indore S/S.

a) 220 kV B/C at Indore was opened at 09:14 hrs.

b) 400 kV B/C at Indore was opened at 09:15hrs.

Immediately after opening the B/Cs the corresponding B/C-isolators were opened so as to rule out any

chance of re-striking on account of difference in voltages across the B/C during the is-landed operation.

B. Stage-I : Formation of is-land by separating out the identified subsystem -

1. Unit #5 at ISP was started after a change in its droop setting so as to operate the unit between a wider

frequency range (45-55 hz) and synchronised at 09:33 hrs. Flow on the 400kV ISP bus coupler was

closely observed.

2. The load at Jetpura and generation of ISP unit #5 were adjusted so as to make the flow on the B/C at

ISP closed to zero MW.

3. Then the B/C at ISP was opened followed by opening of both-side isolators at 10:12:48 hrs after

getting a code from WRLDC.

The is-land separated out at 10:12:48 hrs and 347ms and operated independently with frequency varying

widely. Since there was no primary response (governor action), the mechanical power input to the generator

turbine was controlled manually to match the electrical load to stabilize the frequency around 50 hz. But

frequency kept on fluctuating before the unit tripped when frequency touched 45 hz at 10:13:58 hrs (as per

the SOE data retrieved from WRLDC SCADA). Since the sub-system did not survive, the 400 kV circuit

breaker (CB) of ISP-Indore-II was opened from ISP end at 10:41 hrs.

C. Black-starting of unit #5 at ISP and building up of the is-land with the radial load at Jetpura being

fed through 400 kV Indore S/S:

The CBs of all the identified feeders/ICTs to be charged from the black-started unit were opened from

both ends by 10:43 hrs as informed by 400/220 kV Indore S/S. Then the CB of 400 kV ISP-Indor-II was

closed at Indore end along with the 50 MVAR line reactor(L/R) at Indore in line. It was decided to start the

unit #5 at ISP and charge the 400 kV dead bus at a reduced voltage level and gradually build up the voltage

as the sub-system stabilized. Then the following operations were performed to black start unit #5 at ISP and

gradually build up the is-land.

1. Start-up power to unit #5 at ISP was cut-off by tripping incomer at 11 kV switch-gears at 10:56 hrs. The

DG set started automatically within 10 seconds feeding start-up (auxiliary) power to unit #5.

2. Unit #5 was started at 11:20 hrs with a reduced terminal voltage (4kV against the rated voltage of 11kV)

at the 11/400kV GT (generator transformer) primary and generator circuit breaker was closed, charging

the 400 kV dead bus (Main Bus-B) at ISP at 11:20 hrs. The voltage observed at 400 kV ISP Main Bus-B

was around 160 kV(approximately).

3. Then 400 kV ISP-Indore-II was charged by closing the CB from ISP end at 11:34 hrs. This resulted in

charging of 400 bus-I at Indore along with the 50 MVAR L/R at Indore. The voltage observed at Indore

400 kV bus-I was around 150 kV which was insufficient for charging the 400/220kV ICT-I at Indore.

Hence the generator terminal voltage was increased so as to achieve 200-210 kV at 400 kV Indore bus-I.

4. Then the 400/220 kV Indore ICT-I was charged at 11:48 hrs by closing the HV side CB followed by

charging of 220 kV bus-I at 11:50 hrs by closing the LV side CB.

5. Then 220 kV Indore-Jetpura-II was charged from Indore end at 11:51 hrs followed by charging of 220

kV main bus-I at Jetpura at 11:52 hrs.

6. Then 220/132 kV ICT-I at Jetpura was charged at 11:53 hrs and 132 kV Jetpura bus was charged at

11:54 hrs, followed by charging of 63 MVA, 132/33 kV transformer at Jetpura at 11:55 hrs. Then 33 kV

Jetpura bus was charged at 11:55 hrs.


7. Generator terminal voltage at ISP was gradually increased and a voltage of around 370kV at Indore bus-I

was achieved at 12:10 hrs. Generator turbine speed was gradually increased to reach a high frequency

before addition of any load at Jetpura. A frequency of 52 hz for the is-land was achieved at 12:14 hrs.

8. Then radial load was added gradually at Jetpura by charging the identified 33 kV feeders. The first load

(33 kV BPCL feeder) added was 0.7 MW (approximately) at 12:15 hrs causing the frequency to dip to

51.89 Hz. Subsequently 33 kV Ramaphosphate, Dhaturia, Sanwer and Dharampuri feeders were

connected at 12:18 hrs, 12:20 hrs, 12:30 hrs and12:43 hrs respectively as informed by Indore S/S. The

load was thus increased in steps and generator output was adjusted accordingly to maintain frequency

between 50-51hz. At 12:58 hrs the unit was catering to a load of 12.01 MW(approximately) at 50.9 hz as

per the data observed at ISP.

D. Synchronisation of the is-land with rest of grid by closing the 400 kV B/C at Indore:

After successfully operating the is-landed subsystem for almost one hour, preparation was made to

synchronise the is-land with rest of the grid. It was planned earlier to synchronise the is-land with rest of the

N-E-W grid at 400 kV Indore S/S since synchronising facility was not available with the 400 kV bus-coupler

at ISP.

1. The generator output was adjusted to bring down the frequency close to that of the N-E-W grid.

2. The bus voltage at 400 kV Main Bus-I (part of island) was 381 kV while that of the bus-II(part of main

grid) was close to 420 kV at 13:00 hrs. Hence the generator terminal voltage was gradually increased to

increase the voltage level at Indore bus-I. A voltage close to 420 kV at Indore 400 kV main bus-I was

achieved by 13:11 hrs.

3. The voltage magnitudes, phase sequences and frequencies of 400 kV bus-I and bus-II at Indore were

closely monitored with help of the synchronising trolley at Indore S/S and the bus-coupler was check-

synchronised at 13:12:37 hrs(as per WRLDC SOE data) when the N-E-W frequency was 49.92 hz.

4. Unit #5 at ISP experienced mild jerk and tripped immediately (at 13:12:38 hrs-as per WRLDC SOE data)

on excitation failure alarm.

5. 220 kV Indore B/C was closed at 13:25 hrs. Normalisation of all arrangements made at different

locations were completed by 14:36 hrs as per the information received from 400/220 kV Indore S/S.

E. Sequence of Events for the Black Start Exercise is summarized below:

Sl. No. Time in

hrs

Event

1. 10:12:48 Subsystem successfully created with radial load of 16-18MW at Jetpura.

2. 10:13:58 The island collapsed when frequency fell below 45 hz during manual control

of generation of unit #5 at ISP.

3. 11:20 Unit # 5 of Indira Sagar HEP self-started through station D.G. supply and

dead 400 kV Main Bus -B at ISP was charged at a reduced voltage level.

4. 11:34 400kV ISP-Indore-II was charged from ISP along with 50 MVAR L/R at

Indore. This caused simultaneous charging of 400 kV Indore bus-I

5. 11:48 400/220 kV Indore ICT-I was charged from 400 kV side.

6. 11:50 220 kV bus-I at Indore was charged.

7. 11:51 220 kV Indore-Jetpura-II was charged from Indore end

8. 11:52 220 kV main bus-I at Jetpura was charged.

9. 11:53 160 MVA,220/132 kV ICT-I at Jetpura was charged.

10. 11:54 132 kV bus at Jetpura was charged.

11. 11:55 63 MVA,132/33 kV transformer at Jetpura charged along with 33 kV bus.

12. 12:10 Terminal voltage at ISP increased so as to achieve 370 kV at 400 kV bus-I at

Indore.

13. 12:15 33 kV BPCL feeder was switched on from Jetpura.

14. 12:18 33 kV Ramaphosphate feeder was switched on from Jetpura.

15. 12:20 33 kV Dhaturia feeder was switched on from Jetpura.

16. 12:30 33 kV Sanwer feeder was switched on from Jetpura.


17. 12:43 33 kV Dharampuri feeder was switched on from Jetpura.

18. 13:12:37 Check-synchronisation of 400 kV B/C at Indore causing synchronisation of

the is-land with N-E-W grid.

19. 13:12:38 Unit #5 at ISP tripped on jerk with excitation failure alarm.

20. 14:36 All intermediate arrangements were normalised as per the information

received from Indore s/s.

F. Issues that needed further improvement / investigation:

1. Primary response is mandatory for a unit while separating out from the rest of the grid that survives

to operate in is-landed mode. The same was absent at ISP causing collapse of the is-land within

seventy seconds from separation while attempting to stabilize the subsystem through manual control

of the generation. It was understood from ISP that it was not possible to operate the unit under speed

control mode under normal operation. Necessary modifications may be made to ensure that this is

possible under normal mode of operation.

2. Even 15 minutes after opening the 400 kV bus-coupler at ISP voltage of around 200 kV was

appearing on 400kV Main Bus-B at ISP though it was zero immediately after the unit tripped at

10:15:06 hrs. Surprisingly Indore bus-I was also showing similar value (200 kV approximately) at its

end. Though it was assumed to be an instrument error, the voltage became zero only after opening

the CB of ISP-Indore-II from ISP end. This required further investigation.

3. Though the check-synchronisation at 400 kV Indore B/C was done with due diligence and care, the

unit experienced perceptible jerk and tripped on excitation failure alarm (after successfully running

in is-landed mode for around one hour).Thus the healthiness of the synchronising trolley at 400/220

kV Indore(MP),S/S may be checked and rectified.

4. Although the black-start exercise was smooth, the time taken to start restoration of loads after black-

out was close to 2 hrs(10:13:58 hrs to 12:15hrs). This would need to be further reduced to the range

of 30 minutes maximum. One reason for the delay was energization of 400 kV transmission system

at reduced voltage (160 kV). The voltage was gradually built up just before restoring loads at 33 kV.

One of the reasons for energization at low voltage was the apprehension of tripping of 400 kV line

on high voltage as experienced during a similar exercise in 2006. At that time the 50 MVAR L/R at

Indore was not available and energization was attempted at 400 kV. Restoration time can be reduced

if the network is energized in the range of 360-370 kV.

G. Some interesting facts observed during the mock drill (As per WRLDC SCADA data):

1. Maximum load fed in islanded subsystem: 12.69 MW [13:12hrs]

2. Maximum frequency of the subsystem: 53.39Hz [12:12hrs]

3. Minimum frequency of the subsystem: 49.17 Hz [12:10hrs]

4. Maximum voltage of subsystem recoded at 400 kV Indore bus-I: 420kV [13:11hrs]

5. Minimum voltage of subsystem recorded at 400 kV Indore bus-I: 194kV [11:51 hrs]

6. Island created by opening of bus coupler at ISP survived for 70 seconds with 16-17 MW load

(approximately) of Jetpura S/S.

7. This island collapsed during manual control of governor while frequency varied widely and fell

below the 45 Hz at 10:13:58 hrs and 442 ms.

8. Duration of complete load interruption at Jetpura for blackstart exercise: 121 minutes [10:13:58 hrs

to 12:15 hrs].

9. Time taken by the generator to start from DG set after the grid supply (11kV incomer) was

disconnected: 24 minutes [10:56hrs to11:20hrs].

10. The 400/220 kV Indore substation engineers could synchronize the island with main grid within 16

minutes of receiving instruction for check-synchronization from WRLDC.

11. Speed Governor Droop setting of ISP Unit-5 was changed from 5% to 10 % during the black start

mock exercise.


12. The black start exercise (starting the unit from DG set, charging 400 kV dead bus and feeders,

extending power to feed radial load and re-synchronisation of the island with main grid) was

completed in 1 hr and 52 minutes [11:20 hrs to 13:12 hrs].

H. Few graphical plots during the is-landed operation:

47.00

48.00

49.00

50.00

51.00

52.00

53.00

54.00

9:00

:00

9:30

:00

10:0

0:00

10:3

0:00

11:0

0:00

11:3

0:00

12:0

0:00

12:3

0:00

13:0

0:00

13:3

0:00

14:0

0:00

Indore220_Bus-I_Frq(Hz)

ISP_400 BusA_Frq(Hz)

Fre

qu

en

cy(H

z)

Grid Frequency

Is-land Frequency

Is-landed operation

of ISP unit #5

Time(hh:mm:ss)

Total duration of 220 kV bus dead at

Jetpura on account of mock exercise

was from 10:15 to 11:52 [1hr & 27mins]

13:12:37 hrs:

Subsystem was

synchronized with

the main grid

through 400 kV B/C

at Indore.

10:12:48 hrs :

400 kV ISP B/C

opened creating

the is-land.The is-

land collapsed at

10:13:58 hrs

At 12:15 the first load (0.7MW

approx.)connected on 33 kV

Jetpura bus

Indore_Bus-I_Voltage(400kV)

10

110

210

310

410

9:00

:00

9:30

:00

10:0

0:00

10:3

0:00

11:0

0:00

11:3

0:00

12:0

0:00

12:3

0:00

13:0

0:00

13:3

0:00

14:0

0:00

10:13:58 hrs : The is-

land collapsed due to

tripping of unit # 5.

Vo

ltag

e(k

V)

Time(hh:mm:ss)

13:12:37hrs :

400 kV Indore

bus-coupler

check-

synchronised.


LEGEND:

400 kV :

220 kV :

132 kV :

33 kV :

Transformer:

Depalpur-I&IIUjjain-I&IINorth Zone-I&II

63 MVA,132/33 kV BBL make transformer

40 MVA,132/33 kV TELK make transformer

BP

CL

Sa

nwer

Dh

atu

ria

Ram

a P

hos

pha

te

Dh

ara

mpu

ri

160 MVA,220/132 kV Jetpura ICT-II(AREVA make)

160 MVA,220/132 kV Jetpura ICT-I(CGL make)

Ujjain-IIndore-I Indore-II

Ra

dia

l L

oa

d t

o b

e f

ed

fro

m t

he

bla

ck

sta

rte

d u

nit

B/C220kV Main Bus-I220kV Main Bus-II

Ujjain-II

Fig. 1: Jetpura 220/132/33 kV S/S

Jetpura-II

80 kms(Approx.)

Fig. 2: Indore (400/220 kV) S/S

400/220 kV Indore ICT-II,III&IV 400/220 kV Indore ICT-I

Indira Sagar-I

Indira Sagar-II

400kV B/C

400kV Bus-I400kV Bus-II

Nagda


220kV B/C

Jetpura-I

(220 kV Feeders to Ujjain,Dewas,Pithampur,Indore SZ,Badnagar,Barwaha)

30 Kms(Approx.)

ItarsiAsoj

LEGEND:

400 kV :

220 kV :

132 kV :

33 kV :

Transformer:

Jetpura-II

80 kms(Approx.)

Indore (400/220 kV) S/S

400/220 kV

Indore ICT-II,III&IV 400/220 kV Indore ICT-I400kV B/C



220kV B/C

Jetpura-I

(220 kV Feeders to

Ujjain,Dewas,

Pithampur,Indore

SZ,Badnagar,Barwaha)

STEP- 3:

a) 400/220 kV ICT-I,220 kV Jetpura-II to be kept on

220 kV bus -I.

b)400 kV Indira Sagar-Indore-II to be kept on 400 kV

bus-I

c) All other feeders/ICTs to be shifted to bus-II

d)B/Cs continue to remain closed.

30 Kms(Approx.)

kms(Approx.)

Fig. 3: Indira Sagar (400/220 kV)

Indore-II

Indira Sagar-II

400kV B/C

400kV Main Bus-A

Unit #5

400kV Main Bus-B

80 Kms(Approx.)

(All units except unit # 5 and unit # 6 were kept on Main Bus-A)

Unit #2 Unit #1Unit #8

Indore-I

Nagda Satpura

LEGEND:

400 kV :

220 kV :

132 kV :

33 kV :

Transformer:

Generator:

Indira Sagar (400/220 kV) S/S

Indore-II

400kV B/C

400kV Main Bus-A

Unit #5

400kV Main Bus-B

STEP- 4:

a) 125 mW unit #5 and Indore-II feeders to be kept

on Main Bus-B.

b) All other feeders/ICTs to be shifted to bus-II.

c) 400 kV B/C continues to remain closed.

80 Kms(Approx.)

Unit #6


Annex-IX(ii)

Black-Start mock drill at Bargi Hydel Power station A mock black-start exercise for Bargi HPS unit was carried out on 10th February, 2012. SLDC Jabalpur is pleased to place on record the cooperation, assistance and efforts made by engineers from Bargi Hydel Power Station, MP Power Transmission Company, 132 kV Lakhnadaun substation, Generating Control Centre and East DISCOM Control Centre during the mock drill of black start. This black start exercise involved two major stages: Stage-I: Creating an islanded subsystem by separating out unit #2 (45 MW) at Bargi HPS along with radial load at 132/33 kV Lakhnadaun s/s fed through 132 KV bus #1 of bargi HPS, followed by operation of the created island around the Bargi unit for some time.

Stage-II : Creating a blackout in the islanded subsystem created with one unit (45 MW unit #2) of Bargi and radial load at 132/33 kV Lakhnadaun s/s, start of one unit at Bargi, charging of one dead 132 KV bus at Bargi, charging 132 kV Bargi-Lakhnadaun line, islanded operation of the Bargi HPS unit with radial load at Lakhnadaun s/s followed by synchronising this island at Bargi HPS. Bargi is the nearest Hydel power station to Jabalpur. Capacity of the plant is 2x45 MW = 90 MW. Bargi HPS is interconnected with Jabalpur 220 KV sub-station through 132 KV D/C line and to Lakhnadaun 132 KV S/s through 132 KV S/C line. One 132/33 KV 40 MVA transformer at Lakhnadaun S/s feeds consumer load through 5 Nos. 33 KV feeders. The Black Start Mock Drill was proposed to be conducted after creating island at 132 KV Lakhnadaun S/s with Unit No.2 of Bargi HPS. Lakhnadaun 132 KV S/s is having two 132 KV buses - one Main and one Auxiliary bus, 1x40 MVA 132/33 KV transformer and two 132 kV lines viz, 132 KV Lakhnadaun-Seoni S/C & 132 KV Lakhnadaun-Bargi S/C. The maximum loading of about 28 MW was recorded in morning hours on 40 MVA transformer in February 2012 . The loading of each feeder at 33 KV system at 132 KV Lakhnadaun S/s was recorded at 10:30 Hrs on 10th February 2012 as detailed below:

SNo. Name of the feeder Load

1. Jhabua Power Ltd 0

2. Bhimgarh 160 Amp/8MW

3. Lakhnadaun 130 Amp/6 MW

4. Ghansaur 144 Amp/7 MW

5. Dhooma 83 Amp/4 MW

Total load on 40 MVA transformer

~ 25 MW

Prior to start of black start mock exercise it was ensured that 132 KV Lakhnadaun S/s is fed from 132 KV Bargi HPS as well as 132 KV Seoni S/s and all 33 KV feeders shall also be in

charged position. It was also ensured that both 132 KV Bargi-Jabalpur feeders, Unit # 1 & 20 MVA station X-mer are kept on 132 KV Main bus-II, 132 KV bus-coupler in closed position at this stage and Unit # 2 and 132 KV Bargi-Lakhnadaun feeder on 132 KV Main bus-I. This scheme has ensured availability of Unit No.1 at Bargi HPS with 132 KV Jabalpur S/s through Bus-II during mock drill.


The complete black start mock exercise has been conducted at Bargi HPS between 10:25 Hrs to 11.42 Hrs on 10th February 2012. The procedure followed is detailed below :

(1) Islanding of 132 KV Lakhnadaun S/s WITH Unit No. 2 (45 mw) at Bargi HPS 1. The droop setting of Generator under Black Start Mock Drill was 5%.

2. Generation on 45 MW unit #2 at Bargi HPS adjusted equal to load on 132/33 kV 40 MVA transformer (~27 MW) at 10:35 Hrs.


3. Breaker of 132 KV Lakhnadaun-Seoni line opened at Lakhnadaun s/s at 10:38 Hrs. After ensuring Generator output is equal to load connected at 132 KV Lakhnadaun s/s, 132 kV bus-coupler breaker opened at Bargi HPS at 10:45 Hrs on issue of instruction by SLDC forming an island around are fed from 132 kV Lakhnadaun s/s. This exercise was done as bus coupler ammeter at Bargi was found not showing correct reading.

4. The generator output adjusted to match the load. However, the frequency variation from 44.5 Hz to 52.2 Hz has been observed in the islanded system fed from Bargi Unit #2 (45 MW) before getting stabilized. The primary response of the governor was observed and found working. The islanded system with about 25 MW load was run for about 7 minutes.

(2) Blackout in the area fed through 132 KV Lakhnadaun : 1. After stabilizing the island for few minutes, Unit No.# 2 was hand tripped at 10: 52 hrs after

hand tripping of 0.4 kV incomer (auxiliary supply). This has created black out in the area fed from Lakhnadaun S/s.

2. The breakers of 33 KV breakers of 132 KV Lakhnadaun S/s alongwith breaker of 132 KV

Lakhnadaun-Bargi, 40 MVA Transformer (both ends) hand tripped. Similarly 132 KV Bargi-Lakhnadaun breaker has been hand tripped at Bargi HPS.

(3) Black Start Operation : The black-start activities of machine No. 2 at Bargi HPS have been carried out as given below : 1. As soon as Unit No.2 is tripped and black out occurred, the D.G. set should start automatically.

As the auto start up facility is not available with DG set at Bargi HPS, the same has been started manually at 10:55 Hrs.

1. 0.4 kV supply extended to unit bus to start essential auxiliaries and essential auxiliaries of Unit

No. 2 taken into service. 2. SLDC issued instruction at 10:58 Hrs to start Unit No 2. Unit rolling started at 11:00 Hrs. and

132 KV Bus #1 charged at 110 kV at 11:05 Hrs. 3. 132 KV Bargi-Lakhnadaun line charged at 11:07 hrs from Bargi end and Lakhnadaun end at

11:08 Hrs. 4. Breaker of 40 MVA 132/33 kV transformer at Lakhnadaun closed at 11:08 Hrs and voltage of

132 Kv bus at Lakhnadaun adjusted to 126 kV by raising generator voltage at Bargi. The frequency of Unit #2 has been set At 50.5 Hz. At this stage R-Phase bus PT fuse has got blown out which got replaced at about 11:15 Hrs.

5. As per instruction of SLDC, 33 KV Lakhnadaun line charged at 132 KV Lakhnadaun s/s at

11:15 Hrs with load of about 4 MW. Then at 11:16 Hrs 33 kV Ghansore line taken on load. The frequency in the islanded area was 50.2 Hz. Then other 33 kV lines at Laknadaun s/s also closed. The load in the islanded area after black start was as below :

The primary response of governor has maintained the frequency in the islanded area close to 50.0 Hz. The islanded portion operated for about 25 minutes without any difficulty.

1. The islanded portion check-synchronized with the NEW grid by closing 132 kV Bus coupler at Bargi HPS at 11:40 Hrs.

Time Consumer load at Lakhnadaun s/s.

11:17 11 MW

11:18 14 MW

11:22 18 MW

11:24 18 MW 50.0 Hz, 130 kV


Fig 2. Plot of frequency and Unit-2 generation at Bargi HPS which was part of the island during

black start exercise.

Fig 3. Plot of Bus 132 kV -1 Voltage at Bargi HPS which was part of the island during black start

exercise

Observations and analysis of the exercise : The results of black start exercise of Bargi HPS has been quite satisfactory. The restoration of the supply to Lakhnadaun area post black out took about 23 minutes which could have been reduced to 16 minutes if the bus PT fuse did not blow out at Bargi. The restoration of the system within this short time without any abnormal behavior of voltage, frequency and other electrical parameters will help in restoration process in real time.

The graphical plots in Fig. 2 & 3 based on the achieved data at SLDC indicate various observations made during the exercise. The subsystem in island condition operated for almost 7


minutes pre-black out (10:45 Hrs to 10:52 Hrs) 25 minutes after black start (11:15 hrs to 11:40 Hrs). The frequency of the island remained close to 50.0 Hz, which shows that the unit is perfectly working in free governor mode.

The DG set at Bargi HPS do not have auto start facility and thus started manually. MPPGCL may explore the possibility of installing auto start facility so that the DG set start automatically in real time under black out conditions.

The capabilities of the generator that got tested during black start exercise include the capability to start from a DG set, to regulate the active and reactive power output so as to operate the island at reduced standards of frequency and voltage, to operate under partial loading condition without losing stability, primary response of the generator, healthiness of synchronisation facility etc. The transmission capability that were put to test include the ability of switch gear to charge dead bus, healthiness of bus breakers, flexibility available in protection systems in terms of operating at other than normal settings for a short period.

Other observations that need immediate attention by MPPGCL are described hereunder :

(1) After opening of bus coupler at 10:38 Hrs at Bargi HPS, 48 Volt charger tripped and as 48 VDC battery is in bad condition the telemetry become out till battery charger put back into service at about 11:06. Thus vital data for this period is not available. The 48 VDC battery therefore need to be replaced within the shortest possible time. The cause of tripping of 48 V charger also need to be investigated by MPPGCL.

(2) The hunting of Generator output (Unit 2) also observed in GT control panel and as telemetry transducer inputs are extended from the same control panel, the hunting also recorded in SLDC SCADA system. The hunting to the extent +22 to -24 MW observed though the generation and frequency was stable. This also need to be investigated and corrective measures should be taken by MPPGCL.

(3) The ampere meter on 132 kV Bus coupler panel at Bargi HPS was showing 130 Ampere current irrespective of load and even when both buses were isolated by opening bus coupler, the meter continued showing 130 Amp current. The ampere meter need to be recalibrated/replaced. Conclusion: Black out in power grid is a worst kind of contingency and brings unpleasant situations when it occurs. Since the power systems worldwide are evolving both in size and complexity, the conventionally adopted recovery procedures requires constant review, upgradation, test and validation. The black start exercises assume vital importance for any large interconnected power system since they do not only testify the existing restoration facilities but also prepare the system operators to restore the power system in a shortest possible time by identifying deficiencies and suggesting scopes for improvement.


Annex-IX(iii)

MOCK BLACKSTART OPERATION AT SSP ON 8TH APRIL 2012

• A mock self start exercise for SSPPL was carried out on 8th April 2012 .

• Exercise involved creation of island that involved SSP Unit-2 ,SSP-Asoj S/C line ,Asoj 400/220

ICT-1 ,220KV Asoj-Wagodia line and loads at Wagodia.

Fig : 11KV AND BELOW SLD OF SSP PLANT THEIR OPERATION DURING BLACK START

11KV Switch Yard(S/Y) is GIS at SSP.

2 no of 13.8KV/11KV STR (station transformer) are there in total which are connected from LV side

of GT(Generator Transformer). STR-1 is connected from GT-1 and STR-2 is connected from GT-4.

2 no of SST- (station service transformer) from 11KV Bus-A supplies to 415 KV SSB (station

service bus).

SSB-A supplies to station and unit auxiliary of unit 1, unit 2 and unit 3 .Whereas SSB-B supplies to

unit 4,unit 5 and unit 6.

So to conduct the mock black-start and islanding operation with unit 2 and 3, B/C of 11KV bus and

so as of SSB were opened.

Unit 6 was running as per schedule and it got auxiliary supplies from STR-2

During first stage of mock exercise unit 2 was started with supply from STR-1 .But after the system

was completely blackout, unit -2 started taking auxiliary supplies from DG set-2.


With this type of circuit connection Unit-1,2,3 forms a group and Unit-4,5,6 forms another. So at a

time any of the units from 1,2 or 3 can be used for islanding operation with any of the unit 4,5 or 6

continuing normal operation with grid.

Brief details of Mock-Exercise as per activities observed at SSP end.

1. 8:55Hrs to 9:05Hrs -Bus changeover at SSP . GT-2,GT-3 and 400KV Asoj line is kept on Bus A.

Remaining lines and Units were connected to Bus B.400KV SSP-Dhule-1 and 400 KV SSP-

Rajgarh-1 were out during that time to control High voltage.

2. 9:10Hrs SAT-1 is made off and load was taken on SAT-2.Bus coupler of 11KV bus is off and Dam-

1 feeder also made off.

3. 10:00Hrs Unit-2 was put in FGMO mode and so as Unit -3 at 10:05 Hrs.

4. 10:45Hrs start command was given to Unit-2 and unit synchronised at 10:52 Hrs. Generation on

Unit-2 was 80MW and it was absorbing 20MVAR.Guide vane position was 4.4. Freq was 50.01HZ .

At that time Unit-6 was also running as per schedule and there was a flow of around 190MW on

400KV SSP-Asoj S/C line.

5. 11:10Hrs 400 kV Bus Coupler(B/C) at SSP was opened isolating Bus-A and Bus -B . So Asoj line

flow was reduced to 78MW as it was connected to Bus -A with only generation from Unit-2.Bus-A

voltage was 414MW and freq was 49.89HZ.

6. Bus changeover at 400KV Asoj and 220KV Asoj was already done and at 11:14Hrs 220KV Asoj

Bus coupler was opened.

7. Now the only element that connects this island grid to NEW grid was Bus Coupler at 400KV Asoj.

As informed by SLDC Gotri ,Wagodia Load was around 42 MW .So from 11:19 Hrs generation

reduction at Unit-2 started to make flow on Asoj B/C close to ‘0’ MW.

8. 11:21 Hrs Unit -2 generation was 60MW and -13MVAR . At 11:22Hrs Excitation of Unit-2 was kept

on MEC(manual excitaion) to control voltage manually. Generator Terminal Voltage was 13.5KV to

13.8KV.

9. 11:24 Hrs Unit -2 generation was 65 MW and -37 MVAR. Voltage at SSP was 410KV and at Asoj

412KV. Freq was 49.88HZ.Generation was reduced even further and at 11:26 Hrs it was 56MW, -

35 MVAR. 400KV SSP-Asoj line flow was 52 MW.

10. 11:28 Hrs after confirmation from SLDC and with WRLDC code bus coupler at 400KV Asoj was

opened. Generation was 40MW and Voltage of SSP Bus-A was 412 KV. Before opening of B/C

frequency was 49.76HZ, but after opening of B/C system was completely islanded from NEW grid

and freq was varying between 48.5HZ to 51.8HZ.

11. Oscillation was also observed on voltage and Guiding Vane position of unit-2. At 11:34 Hrs Asoj

line flow was fluctuating between 38MW to 42 MW. Voltage at SSP was between 372KV to 404KV.

12. As Unit-3 was kept as standby machine in case of failure of Unit-2 at 11:41 Hrs GTCB-3 was

opened and at 11:43Hrs Unit-2 was normally stopped causing blackout of island. GTCB-2 also out

on under freqency. So before complete black out system sustained Islanded operation from

11:28Hrs to 11:43Hrs.

13. As per previously planned DG was not kept on automatic mode to start after sensing 0 voltage. At

11:48 Hrs DG-2 stared energizing SSB(system service bus for Unit 1,2,3).

14. SSP-Asoj line was still in service causing a residual voltage around 42KV . At 11:48Hrs SSP-Asoj

line CB was opened from SSP end.

15. At 11:53 Hrs Under frequency relay for Unit-2 was bypassed.12:00Hrs GTCB for Unit-2 closed and

at 12:02 Unit-2 started again. Excitation put on to manual mode. Generator Terminal Voltage was


set on 11KV. At 12:07 GCB was closed charging Bus-A at SSP. Bus Voltage was 328 KV and

frequency was 49.2HZ.

16. Voltage was increased gradually and 12:09Hrs voltage was 394KV,freq was 48.77. G/V position

was varying between1.8 to 2.8.

17. 12:11Hrs 400KV SSP-Asoj line was charged with L/R at Asoj end,but at 12:12Hrs Asoj line tripped

on High Voltage on both stage 1 and stage 2 HV setting.

18. 12:18Hrs another attempt was made to charge Asoj line,but line didn't hold and tripped again.

19. 12:21Hrs voltage was further reduced to 369KV at SSP end and Asoj line was charged at 12:27Hrs

,so as 400KV Bus-1 at Asoj

20. 12:29Hrs 500MVA 400KV/220KV ICT-1 at Asoj charged and so as 220KV bus-1 at 220KV Asoj.

Frequency at that time was around 49.8HZ.

21. 12:34Hrs 220/66KV ICT was charged at Wagodia and load increment started. At the same time

there was 1.23 MW flow on Asoj line . freq was varying between 48.6 HZ to 50.3HZ.

22. Load increment stared at Wagodia so was generation of Unit-2. At 12:39Hrs Unit-2 load was 7MW

and flow on Asoj Line was 3.24MW. Freq was varying between 47.73HZ to 51.3HZ and voltage

was between 360KV to 390KV.

23. 12:45Hrs Unit-2 load 10MW,Line load 8MW. Generator terminal voltage was varying between12.2

to 13.4KV although excitation was on MEC mode. Guiding vane variation was between 1.6 to 3.6

and vibration of upper bracket was 115microns.

24. 12:49Hrs Unit-2 load 14MW ,line load 10.7MW.Freq :48.7HZ- 50.58HZ.

25. 12:52Hrs Unit-2 Load was 24MW.At 12:53 Hrs it increased up to 31MW and line load was 26MW.

26. 12:55Hrs frequency was between 47.26HZ to 50.75HZ with 33 MW generations.

27. 12:58 Hrs generation of Unit -2 was varying between 39MW to 42 MW. Asoj line loading was

around 38 MW.

28. Although there was gradual increment in load with little time delays no significant stability was seen

in frequency, voltage, Guiding vane. Voltage was varying between 370KV to 421KV and

Frequency variation was between 46.6HZ to 51.9HZ.

29. As per SSP this variation was due to less loading on generator and SLDC was not able to provide

further radial loads .

30. So it was advised to stop the machine as synchronization with new grid at such large range of

fluctuation in frequency and voltage is a threat to generator with such a large inertia.

31. At 13:25Hrs Unit -2 was stopped by emergency push button.

32. Before shut down of unit the system operated on islanded mode from 12:34Hrs to 13:25Hrs.

33. At 13:32 Hrs B/C at SSP was closed and it was connected to NEW grid.


Annex-IX(iv)

REPORT OF MOCK BLACK START EXERCISE OF BANGO HYDEL

POWER STATION OF CSPGCL ON 25.08.2012 Details of Bango HPS

1) Unit Capacity: - 3 x 40 MW

2) Commissioning Year: - U#1 - 21.03.94, U#2 - 21.11.94 and U#3 - 11.01.95

3) Type of Turbine: FRANCIS, Vertical position supplied by M/s BHEL.

4) Water Source: Hasdeo River.

5) DG Set Capacity: 250 KVA.

Network for Black Start Drill at Bango HPS consisted of: -

1) 132 KV Bus No.1 at Bango HPS.

2) 132 KV Bango- Jamnipali Circuit no. 2 (Line length- 45 Km.)

3) 132 KV Bus at Jamnipali s/s.

4) 132 KV Jamnipali- Korba East Circuit no. 1(Line length - 10.36 Km.)

5) 132 KV FAR BUS at 132 KV Korba East station.

6) 40 MVA transformer (132/33 KV) No. 2 feeding supply to 33 KV, Phutkapahar, Industrial and

Rajgamar feeders.

Brief Detail of Mock Exercise

Following Pre Mock drill activities were done before Mock Drill.

(A) At Korba East 132 KV S/s

The 132 KV Korba East has two main buses namely NEAR BUS & FAR BUS.Following feeders and

transformers were shifted to 132 KV NEAR BUS:-

a) 220KV/132 KV ICT No. 01 at 132 KV end.

b) 220KV/ 132 KV ICT No. 02 at 132 KV end.


c) 132/33 KV 20 MVA transformer

d) 132/33 KV 40 MVA transformer No. 01.

e) 132 KV Korba- Mopka circuit No. 01.

f) 132 KV Korba -Mopka circuit No. 02.

g) 132/33 KV 6.5 MVA station transformer

h) 132 KV Korba -Champa circuit No. 01.

i) 132 KV Korba- Champa circuit No. 02.

j) 132 KV Korba -Jamnipali circuit No. 02.

Further following feeders and transformers were kept on FAR BUS:-

a) 132 KV Korba - Jamnipali Circuit No.01.

b) 132/33 KV, 40 MVA, Transformer no.2, feeding to 33 KV: Phutkapahar, Industrial Load,

Rajgamar feeders.

(B) At Jamnipali 132 KV S/s

132 KV Jamnipali has only one bus as such so complete shut down of bus was necessary for Mock drill. The

following lines were disconnected from 132 KV Jamnipali Bus:

a) Jamnipali- Vandana Pooling substation at 12:30 hrs.

b) 40 MVA, 132/33 KV Transformer no.2 at 12:55 hrs

c) Supply to Gevra 132 KV Bus also made off from the tapping of Jamnipali-Bango circuit No. 2 at

12:30 hrs.

C) At Bango 132 KV S/s

At 132 KV Bango Hydel power stations, all units and feeders were shifted on main bus No. 2 except

generator No. 3 and Jamnipali feeder No. 2 and then bus coupler also made off .There was no interruption of

supply from Bango Station to 132 KV Manendragarh, 132 KV Bishrampur, VESPL Pooling station and 132

KV Gevra.

a) 12:25 Hrs :- 132 KV Korba East-Jamnipali circuit no.1 switched off

b) 12:30 Hrs :- 33 KV feeders Rajgamar, Industrial & Phutka Pahar switched off.

c) 12:31 Hrs :- 33 KV bus coupler at KEB made off.

d) 12:32 Hrs :- 132 KV breakers of 40 MVA transformers No. 2 at KEB made off.

e) 12:35 Hrs :- 132 KV bus coupler at KEB made off.

f) 12:50 Hrs :- 132/33 KV, transformers no.1 hand tripped from both sides at Jamnipali

g) 12:55 Hrs :- 132/33 KV, transformers no.2 hand tripped from both sides at Jamnipali

h) 12:54 Hrs :- Bango Bus coupler opened.

i) 12:55 Hrs :- 132 KV KEB-Jamnipali circuit No. 2 made off from Jamnipali end.

j) 12:58 Hrs :- 132KV Jamnipali-Bango circuit No.2 hand tripped at Jamnipali s/s.


BLACK START MOCK DRILL EXERCISE SEQUENCE

Sl.No. Time Activity for Mock Drill

1 13:26 Hrs 250 KVA, DG set was started at Bango PS for black start

2 13:27 Hrs 0.4KV Station bus at Bango HPS was charged.

3 13:48 Hrs Rolling of unit no. 3 started.

4 14:00 Hrs Speed came to 187 RPM. Field breaker was made ON and voltage built up to 11 KV.

5 14.02 Hrs Generator breaker of unit no. 3 made ON and bus-1 was charged of Jamnipali made

ON.

6 14:04 Hrs 132KV Bango-Jamnipali line breaker made „ON‟ at Jamnipali S/s

7 14:09 Hrs Supply extended to Korba East 132 KV sub station by charging 132 KV Jamnipali-

Korba East line No. 1.

8 14:12 Hrs 132/33 KV, 40 MVA transformer was charged from both sides & 4 MW Load was

taken immediately Load on the unit has been gradually increased.

9 14:40Hrs About 8 MW load was taken. The voltage & frequency of generator were controlled

at Bango HPS with telephonic assistance from Electrical Control Room of Korba

East 132 KV S/s.

10 14:48 Hrs After stabilizing the parameter at 132 KV FAR BUS, the Bango HPS Machine was

synchronized with 132 KV system at through NEAR BUS by switching ON the Bus

Coupler breaker from ECR at PH-I.

From the above it can be seen that the power from Bango HPS was extended to nearest Jamnipali s/s in 37

minutes and to nearest Thermal Power station of KEB in 43 minutes. Synchronising with the rest of the

system at KEB was done in 01 Hrs and 22 minutes time, successfully.

The voltage of Jamnipali S/s, frequency of FAR BUS at Korba East and loading on 132 KV, KEB-Jamnipali

circuit no.1 are given under:-

VOLTAGE AT 132KV JAMNIPALI BUS DURING MOCK DRILL

100.00

105.00

110.00

115.00

120.00

125.00

130.00

135.00

140.00

145.00

14:0

5

14:0

6

14:0

7

14:0

8

14:1

0

14:1

2

14:1

3

14:1

4

14:1

5

14:1

7

14:1

8

14:2

0

14:2

1

14:2

3

14:2

4

14:2

4

14:2

5

14:2

7

14:2

7

14:2

8

14:3

0

14:3

2

14:3

4

14:3

4

14:3

5

14:3

6

14:3

7

14:3

8

14:4

0

14:4

0

14:4

2

14:4

3

14:4

4

14:4

5

14:4

6

14:4

7

14:4

8

14:4

9

VO

LT

AG

E K

V


The above mock drill has been successful with the active participation of Engineers of all three companies.

However there were certain difficulties faced at different stations a few of them are given under:-

a) The RTU of Bango HPS needs to be brought to service. This will be very helpful in studying the

lapses and thus improving performance.

b) 132 KV Jamnipali substations having only one bus, mock drill is only possible by taking the

complete shut down of bus. Some measures like bus splitting or possibility of another bus may be

explored. Possibilities of re-establishing of old circuit of 132 KV Korba-Bango may overcome

many difficulties during mock trial and will certainly reduce

FREQUENCY AT FAR BUS OF 132KV KEB DURING MOCK DRILL (HZ)

48.50

48.70

48.90

49.10

49.30

49.50

49.70

49.90

50.10

50.30

50.50

50.70

50.90

51.10

51.30

51.50

51.70

51.90

52.10

52.30

14:0

4

14:0

5

14:0

6

14:1

0

14:1

1

14:1

4

14:1

5

14:1

8

14:2

0

14:2

2

14:2

3

14:2

4

14:2

5

14:2

6

14:2

8

14:2

9

14:3

0

14:3

1

14:3

3

14:3

5

14:3

6

14:3

8

14:3

9

14:4

0

14:4

4

14:4

7

14:4

9

FR

EQ

UE

NC

Y H

Z

LOADING ON 132 KV KEB-JAMNIPALI LINE NO.1

AT KEB END DURING MOCK DRILL

syn with system

-10.00-9.00-8.00-7.00-6.00-5.00-4.00-3.00-2.00-1.000.001.002.003.004.005.006.007.008.009.00

10.0011.0012.0013.0014.0015.0016.0017.0018.0019.0020.0021.0022.00

LO

AD

MW

Load MW -0.75 -3.15 -5.10 -5.40 -5.70 -6.60 -7.05 -7.95 -7.50 -7.95 -7.95 -7.95 -7.95 -7.95 20.70 20.25 19.05

14:05:15 14:22:50 14:24:02 14:25:14 14:26:26 14:29:38 14:35:50 14:39:14 14:42:38 14:43:14 14:46:14 14:46:25 14:47:42 14:47:49 14:49:14 14:49:26 14:50:28


c) Many steps involving isolation of many feeders at 132KV Jamnipali Bus, in turn will enormously

help in actual black start condition. The telemetry of this station was also not available to SCADA

due to shut down of Bus.

d) Auto synchronising facility of D.G. Set at Bango HPS may reduce few valuable minutes in

renovation process.

e) A more stable voice and data communication system needs to be built at Bango HPS as difficulty

was observed in contacting engineers at Bango HPS over Mobile, BSNL as well as PLCC

communications.


Annex-IX(v)

BLACK-START MOCK DRILL AT PENCH HYDEL POWER STATION

A mock black-start exercise for Pench HPS unit was carried out on 12th October, 2012. SLDC Jabalpur is pleased to place on record the cooperation, assistance and efforts made by engineers from Pench Hydel Power Station, MPPGCL, MP Power Transmission Company, 132 kV Lakhnadaun substation, Generating Control Centre and East DISCOM Control Centre during the mock drill of black start. This black start exercise involved two major stages:

a) Stage-I : Creating an islanded subsystem by separating out unit #2 (80 MW) at Pench HPS along

with radial load at 132/33 kV Lakhnadaun s/s fed through 132 KV bus #1 of Pench HPS, followed

by operation of the created island around the Pench unit for some time.

b) Stage-II : Creating a blackout in the islanded subsystem created with one unit (80 MW unit #2) of

Pench and radial load at 132/33 kV Lakhnadaun s/s, start of one unit at Pench, charging of one

dead 132 KV bus-I at Pench, charging 132 kV Pench-Seoni-Lakhnadaun line, islanded operation

of the Pench HPS unit with radial load at Lakhnadaun s/s followed by synchronising this island at

Pench HPS.

Pench Hydel Project is interstate project of Madhya Pradesh and Maharashtra having 2x80 MW capacity. Share of Maharashtra in Pench Hydel is 1/3rd (53 MW) and share of MP is 2/3rd (107 MW). Pench HPS is connected with Seoni 132 KV S/s through 132 KV D/c line and to Maharashtra through 132 KV Pench-Kanhan and 132 KV Pench-Mansar line.

The Pench Hydel Generation is mainly fed to 132 KV Seoni S/s through 132 KV Pench-Seoni lines. Further 132 KV S/s Seoni is connected to EHV sub-station at Balaghat, Lakhnadaun, Nainpur & Seoni I & II through 132 KV lines..The load of 132 KV Lakhnadaun S/s has been made radial to Pench HPS by opening of 132 KV breaker of Lakhnadaun-Bargi line and shifting 132 KV Lakhnadaun-Seoni and Seoni-Pench-I on 132 KV Auxiliary Bus at 132 KV Seoni S/s. At Lakhnadaun sub-station there are (40 MVA + 20 MVA) 132/33 KV X-mers supplying 33 KV loads to consumers. A single line diagram indicating black start arrangement for Pench HPS is also enclosed.

The loading of each feeder at 33 KV system at 132 KV Lakhnadaun S/s was recorded at 10:00 Hrs

on 12th October 2012 as detailed below-

SNo. Name of the

feeder

Load

1. Bhimgarh 52 Amp/2.8 MW

2. Lakhnadaun 48 Amp/2.4 MW

3. Ghansaur 112 Amp/5.6 MW

4. Dhooma 20 Amp/1 MW

Total load on 40 MVA transformer ~ 12 MW

Prior to start of black start mock exercise it was ensured that 132 KV Lakhnadaun S/s is fed from

132 KV Pench HPS as well as 132 KV Seoni S/s and all 33 KV feeders kept in charged position.

It was also ensured that both 132 KV Pench-Seoni line II, 132 KV Pench-Kanhan, 132 KV Pench-

Mansar, Unit # 1 & 20 MVA station X-mer are kept on 132 KV Main bus-II, 132 KV bus-coupler in


closed position at this stage and Unit # 1 and 132 KV Pench-Seoni-II feeder on 132 KV Main bus-

II. This scheme has ensured availability of Unit No.1 at Pench HPS with 132 KV Seoni S/s through

Bus-II during mock drill.

It was decided that at Seoni 132KV S/s, Bus-Coupler breaker shall be kept ON for charging of

132KV Aux Bus and Aux Bus isolator of 132KV Pench-Seoni Ckt-I and 132KV Seoni-Lakhnadaun

Ckt shall be closed at Seoni S/s. The Zone-II DPR setting of 132 KV Pench-Seoni line at Pench

HPS FROM 300 M Sec. to 200 M. Sec, as Auxiliary Bus has been used at Seoni S/s to extend

dgeneration to Lakhnadaun S/s.


The complete black start mock exercise has been conducted at Pench HPS between 10:00 Hrs to

11.35 Hrs on 12th October 2012. The procedure followed is detailed below:

(1) Islanding of 132 KV Lakhnadaun S/s WITH Unit No. 2 (80 mw) at Pench HPS

1. The droop setting of Generator under Black Start Mock Drill was set at 4 %.

2. Generation on 80 MW unit #2 at Pench HPS adjusted equal to load on 132/33 kV 40 MVA

transformer (~17 MW) at 10:35 Hrs.

3. Main Breaker of 132 KV Pench-Seoni I line, 132 KV Seoni-Lakhnadaun line opened at

Seoni s/s at 10:30 Hrs. After ensuring Generator output is equal to load connected at 132 KV

Lakhnadaun s/s to shift the line to Auxiliary Bus at Seoni 132 KV S/s. The 132 kV bus-coupler

breaker opened at Pench HPS at 10:40 Hrs on issue of instruction by SLDC forming an island

around area fed from 132 kV Lakhnadaun s/s with unit No.1 of Pench HPS.

4. The generator output adjusted to match the load. However, the frequency variation from

48.5 Hz to 51.2 Hz has been observed in the islanded system fed from Pench Unit #2 (80 MW)

before getting stabilized. The primary response of the governor was observed and found working.

The islanded system with about 14 MW load was run for about 10 minutes.

(2) Blackout in the area fed through 132 KV Lakhnadaun :

1. After stabilizing the island for few minutes, Pench Unit No # 2 was hand tripped at 10: 50

hrs by hand tripping of 0.4 kV incomer (auxiliary supply). However the unit did not trip, then 132 KV

Generator Breaker opened, the generator output became zero but turbine did not trip. The same

tripped by operating Turbine Emergency Trip button. This has created black out in the area fed

from Lakhnadaun S/s.

2. The 33 KV breakers at 132 KV Lakhnadaun S/s alongwith breaker of 132 KV Lakhnadaun-

Seoni-Pench line, 40 MVA Transformer (both ends) hand tripped. Similarly 132 KV Pench –Seoni I

breaker has been hand tripped at Pench HPS.

(3) Black Start Operation : The black-start activities of machine No. 2 at Pench HPS have

been carried out as given below :

1. As soon as Pench Unit No.2 is tripped and black out occurred, the D.G. set should start

automatically. As the auto start up facility is not available with DG set at Pench HPS, the same has

been started manually at 10:53 Hrs.

2. Supply to RTU at Pench is also interrupted hence the data communication is also interrupted.

Supply to RTU normalized within a few minutes and data communication normalized.

3. 0.4 kV supply extended to unit bus to start essential auxiliaries of Unit No. 2 taken into service.

4. SLDC issued instruction at 10:54 Hrs to start Unit No 2. Unit rolling started at 10:55 Hrs. and

132 KV Bus #1 charged at 90 kV at 11:00 Hrs.


5. 132 KV Pench-Seoni-Lakhnadaun line charged at 11:03 hrs from Pench end and Lakhnadaun

end at 11:04 Hrs.

6. Breaker of 40 MVA 132/33 kV transformer at Lakhnadaun closed at 11:04 Hrs and voltage of

132 Kv bus at Lakhnadaun adjusted to 133 kV by raising generator voltage at Pench.

7. As per instruction of SLDC, 33 KV Dhuma feeder made ON at 11.05 Hrs and gradually other

33 KV feeders i.e. 33 KV Lakhnadaun, 33 KV Bhimgarh, 33 KV Ghansour made on at 11.09 hrs,

11.11 hrs, 11.12 hrs, respectively. Gradually load also increased upto 14 MW at 11.20 hrs. Load in

islanded portion was automatically maintained smoothly by governor operation in between 49.3 Hz

to 51.2 Hz frequency. The load in the islanded area after black start was as below :

Time Consumer load at Lakhnadaun s/s.

1111:05 2 MW

1111:09 5 MW

1111:11 9 MW

1111:12 14 MW 50.0 Hz, 130 kV

The primary response of governor has maintained the frequency in the islanded area close to 50.0

Hz. The islanded portion operated for about 20 minutes without any difficulty.

8. The islanded portion check-synchronized with the NEW grid by closing 132 kV Bus coupler at

Pench HPS at 11:25 Hrs.

Fig 2. Plot of frequency and Unit-2 generation at Pench HPS which was part of the island during

black start exercise.

PERFORMANCE DURING BLACK START

45

46

47

48

49

50

51

52

53

54

55

10:0

0,0

3

10:0

2,3

3

10:0

5,0

3

10:0

7,3

3

10:1

0,0

3

10:1

2,3

3

10:1

5,0

3

10:1

7,3

3

10:2

0,0

3

10:2

2,3

3

10:2

5,0

3

10:2

7,3

3

10:3

0,0

3

10:3

2,3

3

10:3

5,0

3

10:3

7,3

3

10:4

0,0

3

10:4

2,3

3

10:4

5,0

3

10:4

7,3

3

10:5

0,0

3

10:5

2,3

3

10:5

5,0

3

10:5

7,3

3

11:0

0,0

3

11:0

2,3

3

11:0

5,0

3

11:0

7,3

3

11:1

0,0

3

11:1

2,3

3

11:1

5,0

3

11:1

7,3

3

11:2

0,0

3

11:2

2,3

3

11:2

5,0

3

11:2

7,3

3

11:3

0,0

3

11:3

2,3

3

11:3

5,0

3

TIME

FR

EQ

(H

Z)

0

5

10

15

20

25

30

35

40

45

50

55

60

65

70

75

80

MW

FRQ MW

Turbine did

not trip

Blackout

Turnbine

H/T

IslandingBlack Start

Synchronised with NEW Grid

Load stabilised


Fig 3. Plot of Bus 132 kV -1 Voltage at Pench HPS which was part of the island during black start

exercise

Observations and analysis of the exercise : The results of black start exercise of Pench HPS

has been quite satisfactory. The restoration of the supply to Lakhnadaun area post black out took

about 15 minutes. The restoration of the system within this short time without any abnormal

behavior of voltage, frequency and other electrical parameters will help in restoration process in

real time.

The graphical plots in Fig. 2 & 3 based on the achieved data at SLDC indicate various

observations made during the exercise. The subsystem in island condition operated for almost 10

minutes pre-black out (10:40 Hrs to 10:50 Hrs) 15 minutes after black start (11:15 hrs to 11:25

Hrs). The frequency of the island remained close to 50.0 Hz, which shows that the unit is perfectly

working in free governor mode.

The unit did not trip on removing 0.4 KV station supply. Moreover on opening of 132 KV generator

breaker the turbine did not trip and speed overshoot. The same need to be investigated and

remedial measures need to be taken by MPPGCL.

The DG set at Pench HPS do not have auto start facility and thus had to start manually. MPPGCL

may explore the possibility of installing auto start facility so that the DG set start automatically in

real time under black out conditions.

The capabilities of the generator that got tested during black start exercise include the capability to

start from a DG set, to regulate the active and reactive power output so as to operate the island at

Voltage of Bus #1 at Pench Hydel Power Station during Black Start

0

20

40

60

80

100

120

140

160

10:0

0,03

10:0

3,03

10:0

6,03

10:0

9,03

10:1

2,03

10:1

5,03

10:1

8,03

10:2

1,03

10:2

4,03

10:2

7,03

10:3

0,03

10:3

3,03

10:3

6,03

10:3

9,03

10:4

2,03

10:4

5,03

10:4

8,03

10:5

1,03

10:5

4,03

10:5

7,03

11:0

0,03

11:0

3,03

11:0

6,03

11:0

9,03

11:1

2,03

11:1

5,03

11:1

8,03

11:2

1,03

11:2

4,03

11:2

7,03

11:3

0,03

11:3

3,03

11:3

6,03

Time

KV


reduced standards of frequency and voltage, to operate under partial loading condition without

losing stability, primary response of the generator, healthiness of synchronisation facility etc. The

transmission capability that were put to test include the ability of switch gear to charge dead bus,

healthiness of bus breakers, flexibility available in protection systems in terms of operating at other

than normal settings for a short period.

Conclusion: Black out in power grid is a worst kind of contingency and brings unpleasant situations when it occurs. Since the power systems worldwide are evolving both in size and complexity, the conventionally adopted recovery procedures requires constant review, upgradation, test and validation. The black start exercises assume vital importance for any large interconnected power system since they do not only testify the existing restoration facilities but also prepare the system operators to restore the power system in a shortest possible time by identifying deficiencies and suggesting scopes for improvement.


Annex-IX(vi)

Black Start Mockdrill at CCPP VATVA

Date

28-11-2012


31 415 v HRSG-2 MCC breaker ON 07:16:48 01:41:57

32 GTG-2 synchronised –HOUSE LOAD 07:27:14 01:52:23

33 Switch ON 11KV UAT-2 07:28:01 01:53:10

Time 05:34 Hrs.

DG Set Details

Make : Kirlosker

Capacity : 500 KVA, Voltage : 415 V

Fuel Tank Capacity 1000 LTR

Starter with 24 V Battery , Two Cells 0f 12 Volts

Sr. no Black Start with DG SET Time Response

time

1 UT-3 11KV breaker OFF 05:34:43

2 Switch OFF 11 KV UAT-2 05:34:44

3 Switch OFF 11 KV SST-2 05:34:44

4 Switch OFF 415 v UAT-2 incomer 05:34:44

5 415 v Unit bus coupler ON 05:34:44

6 Switch OFF 415 v SST-2 incomer 05:34:44

7 415 v Station bus coupler ON 05:34:44

8 UT-1 11KV breaker OFF 05:34:51 00:00:00

9 Switch OFF 11KV UAT-1 05:34:52 00:00:01

10 Switch OFF 415 v UAT-1 incomer 05:34:52 00:00:01

11 Switch OFF 11 KV ST-1 05:34:55 00:00:04

12 Switch OFF 11 KV SST-1 05:34:55 00:00:04

13 Switch OFF 415 v SST-1 incomer 05:34:55 00:00:04

14 GT-1 DC EOP ON 05:35:02 00:00:11

15 GT-2 DC EOP ON 05:35:03 00:00:12

16 ST DC EOP ON 05:35:06 00:00:15

17 Switch OFF 11 KV ST-2 05:35:11 00:00:20

18 Switch OFF 3.3 KV ST-2 05:35:11 00:00:20

19 415 v HRSG-1 MCC breaker OFF 05:35:24 00:00:33

20 415 v CWPH MCC breaker OFF 05:35:29 00:00:38

21 415 v HRSG-2 MCC breaker OFF 05:35:30 00:00:39

22 415 v MCC-1 breaker OFF 05:35:35 00:00:44

23 415 v MCC-2 breaker OFF 05:35:36 00:00:45

24 415 v MCC-4 breaker OFF 05:35:39 00:00:48

25 415 v DG incomer breaker ON 05:35:51 00:01:00

26 Unit bus tie breaker ON

27 Station bus tie breaker ON

28 Check DG set Amps. Loading.(Safe limit is 680 amps) 480 A

29 Start ACW-C, Close all opened vent. Check DG SET loading 05:38:30 00:03:39

30 415 v MCC-2 breaker ON 06:33:28 00:58:37


34 Switch ON 11KV SST-2 07:28:05 01:53:14

35 Switch ON 11KV ST-2 07:28:08 01:53:17

36 415 v DG incomer OFF and 415 v UAT-2 ON 07:28:37 01:53:46

37 Station tie breaker OFF and 415 v SST-2 ON 07:29:08 01:54:17

38 415 v CWPH MCC breaker ON 07:29:23 01:54:32

39 415 v HRSG-1 MCC breaker ON 07:29:27 01:54:36

40 415 v MCC-4 breaker ON 07:29:33 01:54:42

41 415 v MCC-1 breaker ON 07:29:37 01:54:46

42 UT-3 11KV breaker synchronised with 66K system 07:30:44 01:55:53

43 UT-1 11KV breaker ON - 07:31:13 01:56:22

44 Switch ON 11KV ST-1 07:31:19 01:56:28

45 Switch ON 11KV SST-1 07:31:23 01:56:32

46 Switch ON 11KV UAT-1 07:31:27 01:56:36

47 Switch ON 415 v UAT-1 incomer & bus coupler OFF 07:32:17 01:57:26

48 Switch ON 415 v SST-1 incomer & bus coupler OFF 07:32:43 01:57:52

49 Switch ON 3.3 KV ST-1 07:32:52 01:58:01

50 Switch ON 3.3KV ST-2 07:32:58 01:58:07

Annexure-X

Ready Reckoner on Reactive Power Management


1. Change in voltage at a bus

∆ V = ∆Q .

V Fault Level of the Bus

Units: ∆ V & V (kV), ∆ Q (MVAR), Fault Level (MVA)

2. Fault contribution at HT bus of Unit Transformer:

Sl. No. Unit Size(MW) Type 3 Φ MVA Contribution

1 60 Hydro 280

2 120 Thermal 490

3 210 Thermal 735

4 500 Thermal 1800

Thumb Rule: Short circuit level contribution of a generating unit is 3-4 times its MVA

rating.

3. Line Charging MVAR:

(Source: CEA: Manual on Transmission Planning Criterion, 2013)

4. Line Current

Sl.No. Voltage Level

(kV)

Ampere/MVA

1 132 4.4

2 220 2.6

3 400 1.4

5. Voltage rise at receiving end of uncompensated line

Sl. No. Voltage

Level (kV) Conductor Type

Line Charging MVAR/100

km/circuit

1 132 Panther 5

2 220 Zebra 13.5

3 400 Twin Moose 55.5

4 400 Quad Moose 74

5 400 Quad Bersimis 74.6

6 765 at 400 Triple Snow Bird 65.6

6 765 Quad Bersimis 291

Sl. No. Voltage

Level(kV)

Conductor

Type

(Single circuit)

Voltage Rise

(kV) per 100km

1 132 Panther 0.75


S

6. Rated breaking Current Capability of Switch Gear

(Source: CEA: Manual on Transmission Planning Criterion, 2013)

7. MW vs Current (ampere)

Sl. No. Voltage Level (kV) MW

1 400 =2/3 * current (amp)

2 220 =1/3 * current (amp)

3 132 =1/4 * current (amp)

8. Impact of 1000 amp flow on a 100 km Long 400 kV Line (p.f.=1)

a) I2 X loss -100 MVAR

b) I2 R loss -10 MW

c) Potential drop (Vs-Vr) -3.3 kV

9. Line Equivalent of a Transformer:

Conductor Type

500 MVA

Transformer is

equivalent to

transmission

line (in km)

315 MVA

Transformer is

equivalent to

transmission line

(in km)

250 MVA

Transformer is

equivalent to

transmission line

(in km)

765 KV Quad

Bersimis

559 887 1117

400 kV Quad

Bersimis

153 242 305

400 kV Quad Moose 159 253 319

400 kV Triple

Snowbird

145 230 290

400 kV Twin Moose 120 191 241

220 kV Zebra 30 48 61

***

ACKNOWLEDGEMENT

2 220 Zebra 1.5

3 400 Twin Moose 3

Sl. No. Voltage Level (kV) Kilo ampere

1 765 40/50

2 400 50/63

3 220 31.5/40

4 132 25/31.5


We do thankfully acknowledge the various inputs given by the W.R constituents, IPPs and all other

utilities for preparing this document. The sharing of experience of the Engineers from the

constituents of Western region had greatly helped in bringing out this document that would serve

the practical needs while restoring the grid. This document is intended to be useful for the operating

personnel during restoration of the Western Regional grid. We look forward to enrich this document

with the experience of W.R constituents from time to time.

***

Bibliography:


1. M. M. Adibi: Power System Restoration Methodologies and Implementation strategies,

IEEE Press.

2. Central Electricity Regulatory Commission: Indian Electricity Grid Code-May2010.

3. Black Strart Restoration Procedure of Southern Region.

4. System Restoration Procedures of Northern Region.

5. Black Strart and Restoration Procedure of NER grid.

6. Black Start facility start-up power and Restoration Procedure for Eastern Regional Grid.

***

recovery procedure for western region - srldc · starting of motor of power plant auxiliaries like...

Documents