technical specification for power quality restorer · pdf filespecification for power quality...

Specification for Power Quality Restorer for AC

Traction System

Effective from : 01.01.2015

Specification No. TI/SPC/PSI/PQR/0140 (12/2014)

1

SPECIFICATION No. TI/SPC/PSI/PQR/0140 (12/2014)

GOVERNMENT OF INDIA MINISTRY OF RAILWAYS

TECHNICAL SPECIFICATION

FOR

POWER QUALITY RESTORER

FOR

AC TRACTION SYSTEM

ISSUED BY

TRACTION INSTALLATION DIRECTORATE,

RESEARCH DESIGNS & STANDARDS ORGANISATION,

MANAKNAGAR,

LUCKNOW – 226 011.

[Web site: www.rdso.indianrailways.gov.in]

ISSUED: December, 2014


Traction System



2

SPECIFICATION: Power Quality Restorer for AC Traction System.

SPECIFICATION No.: TI/SPC/PSI/PQR/0140 (12/2014)

Specification Number Amendment /

Revision No.

Total Pages Date of

Issue

TI/SPC/PSI/PQR/0140

(12/2014)

0 44 ……….

PREPARED BY CHECKED BY APPROVED BY

SIGNATURE

NAME Praveen

Chandra

Arvind Kumar A.K.Sharma

DATE 12.12.2014 15.12.2014 16.12.2014

DESIGNATION Senior

Section Engineer

Dy. Director

(TI-PSI)

Joint Director

(TI-PSI)


Traction System



3

INDEX

Para Title Page No

1. Scope 6

2. Governing Specification 6

3. Environmental Conditions 7

4. Traction Power Supply 8

5. Technical Specification 11

6. General Arrangement for Control of Power

Quality Restorer and Associated Equipments

14

7. Control Panel 15

8. Current & Potential Transformer 18

9. Protection against Lightning & Surges 18

10. Earthing 18

11. Painting 18

12. Fastners 19

13. Testing of Power Quality Restorer 19

14. Capitalisation of Losses & Benefits 23

15. Technical Data & Drawings 23

16. Additional Particulars 25

17. Erection, Testing & Commissioning 25

18. Spare Parts, Catalogue & Support

Commitment

25

19. Training of Indian Railway Engineers 25


Traction System



4

ANNEXURES

Annexure

Number

Annexure Title Page No.

A Schedule of Guaranteed Performance,

Technical & other Particulars

26

B Associated Specifications to Power Quality

Restorer Equipment

33

APPENDIX

Number Appendix Title Page No.

I Related Equipment at Traction Sub-station 34

II General Scheme of Supply for 25 kV, 50 Hz,

Single Phase Traction System

35

III A Typical Daily Load Curve of a Traction

Sub-station

36

III B Typical Daily Average Power Factor of a

Traction Sub-station

37

III C Summarised Load information furnished by

Zonal Railway

38

IV General Scheme of IGBT based Power Quality

Restorer

39

V Typical Schematic Diagram of Protection for

Double Transformer Traction Sub-Station

40

VI Equivalent circuit of Traction Power Supply 41

VII Annunciation Label 42

VIII Benefits/Loss information to be submitted by

the Tenderer

43

IX Method of Calculation of Capitalised Cost 44


Traction System



5

GLOSSARY OF ABBREVIATION USED IN THE SPECIFICATION

AMC Annual Maintenance Contract

APP All Poly Propylene

BT Booster Transformer

CD Contract Demand

CRCA Cold Rolled Corban Annealed

CT Current Transformer

EMU Electrical Multiple Unit

GTO Gate Turn Off

HRC High Rupturing Capacity

IGBT Insulated Gate Bipolar Transistor

LED Light Emitting Diodes

KA Kilo Ampere

KV Kilovolt

KVAR Kilo Volt Ampere Reactive

KVp Kilovolt Peak

LT Low Tension

MD Maximum Demand

MEMU Main Line Electrical Multiple Unit

MSL Mean Sea Level

MVA Mega Volt Ampere

MVAHr Mega Volt Ampere Hour

MWHr Megawatt Hour

OHE Overhead Equipment

PCB Polychlorinated-Biphenyl

PQR Power Quality Restorer

PT Potential Transformer

SCADA Supervisory Remote Control and Data Acquisition System

THD Total Harmonic Distortion

TSS Traction Sub-station

USL Upper Specified limit

WPC Wrong Phase Coupling


Traction System



6

SPECIFICATION

FOR

POWER QUALITY RESTORER EQUIPMENT FOR RAILWAY TRACTION SUBSTATION

SPECIFICATION No. TI/SPC/PSI/PQR/0140 (12/2014)

1.0 Scope

1.1 Indian Railways employ 220/25 kV or 132/25 kV or 110/25 kV or

66/25 kV Traction Sub-station (TSS) for supplying Power to the 25 kV Overhead lines for Electric Traction. Hitherto fixed Shunt Capacitor

Banks have been provided at the Traction Sub-stations for improving

power factor.

With a view to achieve nearly unity power factor and mitigate

Harmonics, „Dynamic Compensation Equipment of Reactive Power

and Harmonics‟ is intended to be provided at the Traction Sub-

stations. The Equipment shall be connected on the 25 kV AC Network. Dynamic Compensation of Reactive Power and Harmonics

shall be achieved with the employment of IGBTs or other advanced

Electronic Switching Devices. Compensation may be stepless or in finer steps such that advantages of improved Power Factor and

mitigated harmonics are optimised.

1.2 This Specification covers design, manufacture, supply, testing and commissioning of „Power Quality Restorer‟. It is for outdoor/indoor

installation at the Traction Sub-station of single Phase AC systems

(excluding 2x25 kV AT Feeding System) on Indian Railways for the

mitigation of Harmonics, improvement of Power Factor and reduction of Maximum Demand.

1.3 The „Power Quality Restorer‟ shall be complete with Step down

Transformer, Control Gear, Protective Relays, IGBTs and / or Electronic Switching Device and accessories necessary for its efficient

operation. All such parts and accessories shall be deemed to be

within the scope of this Specification whether or not specifically

mentioned.

1.4 The successful Tenderer shall be required to erect & commission the

equipment. The offer shall, therefore, be inclusive of all expenses

including deputing Engineers and Supervisors by the Tenderer for handling, installation, testing, commissioning of the equipment and

meeting performance requirement.

1.5 All Civil Engineering works, connected with foundations of Power Quality Restorer, associated Transformers, Circuit Breaker, Isolator,

Series Reactor, Potential Transformer, Current Transformer,

Supporting Steel Structures and construction of building for housing

associated indoor equipment shall be done by the Contractor.

2.0 Governing Specification

2.1 The Power Quality Restorer and associated items shall, unless

otherwise specified herein, conform to the latest revision of

Standards mentioned below and associated Specifications listed in


Traction System



7

Annexure-B as well as per the Indian Electricity Rules, as may be

applicable.

i) IS:13585(Pt.I)1994 : Low voltage Capacitors .

ii) IEC-60146-2(1999), : Electrical Rating & characteristics of Voltage

section-7 source Converter.

iii) IEC-60747-9 -2007 : Semiconductor Devices -Discrete Devices

(Insulated- Gate Bipolar Transistors)

2.1.1 In case of any overlapping or conflict in contents of the above Standards and this Specification, stipulations of this Specification

shall prevail.

2.2 Deviations

2.2.1 Any deviation from this Specification, proposed by the Tenderer,

intended to improve performance, utility and overall efficiency, shall

be given due consideration, provided full particulars of the deviation with justification thereof are furnished. In such case, the Tenderer

shall quote according to this Specification and the deviations

proposed by him shall be quoted as an alternate/ alternatives.

2.2.2 Pre-bid meeting shall be arranged by the Purchaser, with eligible Tenderers for the particular requirements of this Specification, site

conditions, mode of transport, availability of site, erection and

commissioning etc.

It is advised that the Bidders shall visit the sites/sections and

familiarise themselves with the local conditions and understand the

requirements of the system in detail, before tendering the Bids and obtain clarifications as may be necessary from the Purchaser.

After the award of the Contract, the Tenderer shall be fully

responsible for successful integration of the compensation scheme

with the associated scheme of Equipment in the switchyard and with the Remote Terminal Units (RTUs) and any items later considered as

essentially required for successful integration shall be within the

scope of the supply and work of the Tenderer.

3. Environmental Conditions

3.1 All Equipments shall be suitable for outdoor/indoor use in tropical

climate and in areas subjected to heavy rainfall, pollution due to

industrial and coastal climates and severe lightning surges in India.

The maximum ambient temperature may reach 500 C in shade, with maximum humidity reaching up to 100%. However, for the design of

the equipment, 500 C category of temperature shall be taken.(Ref.

Table 1 of IS:2834 - 1986)

i) Maximum temperature of Air (in shade) - 550 C ii) Minimum temperature of Air (in shade) - (-)100 C

iii) Maximum relative humidity - 100%

iv) Annual rainfall ranging from - 1750 mm to 6250 mm v) Maximum number of Thunder storm - 85 days

days per annum.

vi) Maximum number of dust storm days - 35 days per annum.

vii) Number of Rainy days per annum - 120 days


Traction System



8

viii) Basic wind pressure - 200 kgf/m2

ix) Altitude above Mean Sea level (MSL) - 2000 meters.

3.2 Vibrations

The Equipment is expected to be installed on foundation in the ground or on Steel Structures, located by the side of Railway tracks

and subjected to vibrations due to the passage of trains. The

amplitude of these vibrations lies in the range of 30 to 150 microns,

with instantaneous peaks going upto 350 microns. These vibrations occur with rapidly varying time periods in the range of 15 to 70 ms.

4.0 Traction Power Supply system

4.1 General Scheme

Single phase, 50 Hz, AC Power Supply for Railway Traction at 25 kV

is obtained from 220/132/110/66 kV 3-phase Grid supply through Step down Power Transformers. The Primary winding is connected

between any two phases of 220/132/110/66 kV, three phase

effectively earthed transmission networks of the Supply Authorities.

The spacing between adjacent Traction Sub-stations varies between 30 to 80 kms. One terminal of the 25 kV Secondary winding of the

Traction Transformer is connected to the Overhead Equipment

(abbreviated as OHE). The other winding is solidly earthed and also connected to Traction Rails.

The load current flows through the OHE to the locomotives and

returns through rail and earth to the Traction Sub-stations. In the middle of adjacent Traction Sub-stations, a dead zone

known as „Neutral Section‟ is provided to isolate the two Phases. The

Power to the OHE on one side of the Traction Sub-stations is fed by

one feeder Circuit Breaker. OHE of each track is controlled by an Interrupter. In case of fault on the OHE, the Feeder Circuit Breaker

clears the fault.

4.2 A Schematic Diagram of a typical arrangement, showing the „General

Feeding Arrangement‟ of a Traction system, as well as the „Schematic General Arrangement at a Traction Sub-station‟ is given in Sketch

No. ETI/PSI/702-I (enclosed at Appendix-II).

4.3 The incoming 220/132/110/66 kV, AC supply voltage may vary

between (+)10% to (–)12.5% as per Rule No. 54 of Indian Electricity Rules-1956. The supply frequency may vary by (±)3% from the

Standard frequency of 50 Hz.

4.4 Protection system

4.4.1 Relays are provided for the protection of Traction Transformers. The

Schematic Diagram for the Protection of Traction Transformers & OHE is given in Appendix-V.

a) Differential Protection b) IDMT Over Current Protection on 220/132/110/66 kV side.

c) Restricted Earth Fault Protection on 220/132/110/66kV side.

d) IDMT Over Current on 25 kV side. e) Restricted Earth Fault on 25 kV side.

4.4.2 The following Protective Relays are provided for the protection of

Over Head Equipments:


Traction System



9

a) Distance Protection b) Instantaneous Over Current Protection.

c) Wrong Phase Coupling Protection.

Note: At some Traction Sub-stations, the Static/Microprocessor

based Relays have been provided (partly or Complete).

4.5 Brief on Equipment provided at the Traction Sub-station is given in

Appendix-I.

4.6 25 kV, AC OHE and Traction Transformer

4.6.1 The OHE generally consists of a stranded Cadmium Copper Catenary of 65 sq. mm. area and a Grooved Copper Contact wire of 107 sq.

mm. area providing a total of 150 sq.mm. copper equivalent. The

loop impedance of the OHE is as under:

The values without Booster Transformer (BT) and Return Conductor–

- Single track OHE 0.41 700 ohms/km

- Double track OHE 0.24 700 ohms/km

- Triple track OHE 0.18 700 ohms/km

The values with Booster Transformers (BT) and Return Conductor– - Single track OHE 0.70 700 ohms/km

- Double track OHE 0.43 700 ohms/km

- Triple track OHE 0.27 700 ohms/km

4.6.2 In some Sections Contact wires of 150/161/193 mm sq. are also

used. The Tenderer may obtain details of impedances from the Zonal Railways, if such wires are used.

4.6.3 Traction Transformer

The Resistance and the Reactance of a typical 13.5 MVA and 21.6

MVA Traction Power Transformer at the Traction Sub-station are (0.179 + j 5.49) ohms and (0.132 + j 4.05) ohms respectively. Only

one transformer is in service at a time. For other ratings of

transformer, the concerned railway shall furnish these values.

4.6.4 Clearances

A minimum clearance of 500 mm is provided, between any live part

at 25 kV, AC and Earth in the 25 kV AC Traction Sub-station.

4.7 Nature of faults on the OHE system

4.7.1 OHE may be subject to frequent Earth faults, or snapping of OHE and touching the Rail/Earth, or loose wires carried by Birds coming in

contact with OHE below Overline Structures, miscreant activities etc.

Faults are cleared by Feeder Circuit Breaker, which operates on

any one or both of the following Protective Relays, depending on the proximity of the fault.

a) Distance Protection Relay (circular or parallelogram characteristics).

b) Instantaneous Over Current Relay.

c) Inadvertent coupling of two Phases between adjacent Traction Sub-stations at the Neutral Section or at intermediate


Traction System



10

Switching Stations, in case of extended feed condition, which

are cleared by one of the Feeder Circuit Breakers at either

end of Traction Sub-station through a "Mho Relay” known as „Wrong Phase Coupling (WPC) Relay‟.

4.7.2 Short Circuit Level

For different Grid supply voltages, Short Circuit Level on Primary side

of Traction Transformer may vary between 7 to 8 kA depending upon

the proximity of the Traction Sub-station to the Generating station. The actual values of fault-level shall be furnished by the

Railway, depending upon the location of Traction Sub-station. The

level of Short Circuit on 25 kV side for a fault in the vicinity of a Traction Sub-station could be around 4 kA. The exact Short Circuit

Level on 25 kV side, at each Traction Sub-station, shall be indicated

in the Tender Paper.

4.8 Nature of load on the 25 kV system

4.8.1 Traction load is of frequent and rapidly varying nature and may

fluctuate between no-load and over loads. While a precise load cycle may be difficult to forecast, a load curve for a typical day together

with indications of the average Power Factor, shall be supplied by the

Railway, in a Format as indicated in Appendix III A & Appendix III B.

Appendix III (A) shows the average MVA (averaged over every 15 minutes period) versus time. Railway shall also provide the

summarised cycle as shown in Appendix-III C based on which the

capitalisation of losses and benefits would be worked out by the

Tenderer, with reference to Clause 14 of this Specification.

4.8.2 The AC Electric Rolling Stock / AC-DC Electric Locomotive / EMUs/ MEMUs are fitted with single-Phase Bridge connected Silicon

Rectifiers with Smoothening Reactor for feeding the DC Traction

Motors. The Rectifiers introduce Harmonic currents on the 25 kV Power supply. Also there are EMUs/ MEMUs / Locomotives with GTO

(Gate Turn Off)/IGBT/Pulse Width Modulation Devices, in place of

Silicon Rectifiers. Typical percentages of the current Harmonics

present in the Traction current with Electric Rolling stock are as follows:

S.No. Harmonic

Order

With Diode

Rectifier (%)

3-Phase Rolling Stock

with GTO‟s/IGBTs*

1. 3rd harmonic 15 The maximum Harmonic

current of the individual Harmonic at no time

shall exceed 0.5 Amps.

except for 3rd harmonic which may have max.

value of 5 Amps.

2. 5th harmonic 6

3. 7th harmonic 4

4. 9th harmonic -

5. 11th harmonic -

Total Harmonic

Distortion (THD)

16.64

* The GTO or IGBT type of Locomotives/EMUs/MEMUs produce substantial 2nd harmonic currents which may be upto 10% of

Fundamental current.


Traction System



11

These are the typical values, Actual values at a particular

Traction Sub-station could be different.

Successful Tenderer shall measure these values before

submitting final design. The Average Power Factor of the Electric locomotive or Electric Multiple Units varies between 0.7 lagging to

unity.

These figures are to serve as guidelines only. The actual

Harmonic content shall vary from Traction Sub-station to Traction

Sub-station. Indian Railways shall provide the data for the Harmonic content on the 25 kV line for particular Traction Sub-

station.

4.8.3 In big yards and in the vicinity of Electric Loco Sheds, a number of

locomotives may be idle with only the load of their Auxiliaries and drawing higher Reactive Power.

5.0 Technical Specification

5.1 Traction System Particulars i) System - Single Phase AC Traction system.

ii) Nominal System voltage - 25 kV (Phase to Earth)

iii) Variation in the Traction - 19 kV to 27.5kV (upto 30 kV at instants)

Supply Voltage. (down to 17.5 kV at instants)

iv) Equipment Voltage class - 52 kV

v) Rated Frequency - 50 Hz + 3%

vi) Average Power Factor of - Between 0.7 and 0.8 lagging the Traction System.

(The typical load cycle shall be supplied by the Railway as

mentioned in Clause 4.8.1). vii) Harmonics - As given in Para 4.8.2

5.2 Power Quality Restorer Equipment

5.2.1 General Scheme

a) General Scheme of Power Quality Restorer Equipment is shown in

Appendix-IV. Switching of Capacitive KVAR and Harmonics

mitigation is through IGBT based PQR Equipment.

The Power Quality Restorer Equipment shall employ air-cooling.

All switching shall be almost transient free.

b) Indian Railways shall provide the data for the Harmonic Content in the 25kV line for the particular Traction Sub-station. This shall

serve as the guideline to the Bidder to size and quote for the

Power Quality Restorer. In addition, the successful Tenderer shall

also measure and record load variation pattern and Harmonic contents for 7 consecutive days at the Traction Sub-station on

which „Power Quality Restorer Equipment‟ is to be provided and

design the Equipment accordingly, which shall be approved by RDSO.

c) The successful Tenderer shall also design the Power Quality

Restorer including its components and related Supporting Structures, including Layout as per actual site conditions, which

shall be approved by RDSO for first system.


Traction System



12

d) Average Power Factor, obtained after installation of Power Quality

Restorer, shall be close to unity and in no case it should be less

than 0.95 lagging and the Power Factor shall not go leading.

Successful Tenderer shall also bring to the notice of Purchaser any

enhancement required in the Power Quality Restorer Equipment

capacity (in kVAR) as specified in the Tender, in order to achieve the desired Harmonic limit as well as the Power Factor.

5.2.2 Ratings

The „Power Quality Restorer Equipment‟ as per this specification may

comprise of fixed and variable compensation, depending upon the

requirement at a particular Traction Sub-station. The ratings indicated in (A) & (B) below are only typical values and the ratings of

„Power Quality Restorer Equipment‟ system based on total reactive

compensation require at a particular Traction Sub-station shall be furnished by Purchaser/Railways.

A) Transformer

i) Rated Primary Voltage - 27 kV

Rated Secondary Voltage - 433 V (see Note-1 below) ii) No load Voltage on the - 27 kV

Primary side.

(The no load here refers to the Traction load. When the

Traction load is negligible, the 25 kV Bus voltage at the Traction Sub-station is 27 kV. This voltage may some

times go upto 30 kV).

iii) Rated Power frequency withstand voltage:

Primary winding - 95 kV for 1 minute. Secondary winding - 3 kV for 1 minute

(see Note-2 below)

iv) Rated Lightning Impulse withstand voltage:

Primary winding : - 250 kVp Secondary winding: - Not applicable

v) Rated frequency: - 50 Hz + 3%

vi) Rated output - Typically 2 MVA However exact rating depends up on „Power Quality

Restorer Equipment‟ system rating (approx. 1.5 times

the variable kVAR rating, being fed through transformer)

Note – 1: Any other secondary voltage/voltages may be adopted with approval of RDSO depending on techno-economic

suitability

Note – 2: These values correspond to 433 Volts secondary voltage.

B) IGBT based Power Quality Restorer-

i) Fixed compensation HT Capacitors - 1100 kVAR with Series Reactor

[As per RDSO Specification No. TI/SPC/PSI/FC&SR/0100]

ii) Dynamic Compensation comprising - ± 1100 kVAR of 11 Nos. 1-phase

433 Volts ± 100

KVAR in parallel


Traction System



13

iii) Total range of compensation - 0-2200 kVAR

Note: The Voltage and KVAR rating of each Panel indicated

above are typical and each Panel rating may be suitably

designed by the Tenderer to provide +/- 1100 kVAR Dynamic compensation, more importantly the required

0 to 2200 kVAR range ( or the range as given in the

Tender Specification).

v) Total Harmonic Distortion (THD) of

Voltage & Current to be achieved - <5%

5.3 Resonant Condition and Inrush Current

The rating of Damping Reactor and Capacitor Bank of each branch shall be such that it does not resonate with the source impedance at

any of the Harmonics of Traction current (refer Para 4.8.2).

Appendix-VI may be referred for Equivalent circuit.

It shall also be ensured that the Inrush current of the Capacitor Bank is within limits and does not exceed the maximum

value guaranteed. Calculations shall be furnished with the Tender in

respect of Inrush current and Resonant frequencies for each of the

operating conditions as also for each Capacitor steps.

5.4 Control of Power Quality Restorer Equipment

5.4.1 The control of the Power Quality Restorer Equipment shall be based on the Reactive Power and Harmonics generated by the Traction load.

Measurement of Reactive Power shall form part of the Control

circuitry.

For this purpose, the two transformer LV currents through 750A/5A CTs, and one Feeder voltage through 25 kV/110 V PT or by

using direct LV side voltage (i.e. 433 V) of the Stepdown Transformer

shall be utilized as input to the Control circuit. (Refer Appendix IV.

Injection of Capacitive KVAR shall be either stepless or in

suitable steps to control Power Factor precisely.

Changes in the kVAR ratings of the Power Quality Restorer Equipment with changes in the 25 kV Feeder Bus voltage shall be

taken care through control circuit. The Power Factor of the Traction

load usually varies from 0.70 to 0.80 (lagging).

The compensation for the Harmonics shall be stepless and shall adapt to the changing load requirements, so that the specified Total

Harmonic Distortion (THD-I) is achieved at all loads.

5.5 Basic Insulation Level (BIL)

The Basic Insulation Level of the complete Low Tension Capacitor

Bank and other associated Equipments shall be as follows:

5.5.1 For Primary side Equipment

a) 1.2/50 s Impulse withstand voltage - 250 kVp

b) One-minute Wet Power Frequency withstand

Voltage (rms) (except Transformer Primary

winding for which 95 kV is applicable) - 105 kV.


Traction System



14

5.5.2 For Secondary side Equipment

a) 1.2/50 s Impulse withstand voltage - N.A.

b) One-minute wet power frequency withstand

voltage (rms) - 3 kV

5.6 Protection of Power Quality Restorer

5.6.1 The offer shall include design and supply of a comprehensive

Protection scheme for the equipment offered by the tenderer. Full

details, including Relay characteristics of the Protection Scheme, offered for the Transformer, Capacitor Bank, IGBT or any other

superior device etc. shall be fully explained in the offer giving

necessary calculations and diagrams.

5.6.2 The Protective Relays offered shall be properly coordinated with the

existing scheme of protection indicated in Drawing No. ETI/PSI/024

attached at Appendix-V.

5.6.3 The Protection system for Shunt Capacitor Bank (if capacitive kVAR injection is through Capacitor Bank) shall include protection against

over current, overload, over voltage, unbalance.

Each Capacitor Element shall be individually protected by means of Internal Fuses. The fuse shall be connected in series with

each Capacitor Element inside the Capacitor Unit to limit the effects

of dielectric failures. If puncture of dielectric occurs, only one element shall be disconnected and the capacitor unit continues to

operate. While selecting the fuse rating, it would be necessary to

choose proper time current characteristics, which in turn significantly

depend upon the cross section and circumference of the Fuse. Fuses chosen shall have adequate thermal capability and comply with

relevant IS/IEC Specifications.

5.6.4 The Protection system for IGBT or any other Electronic switching device shall include protection against over voltage, over current,

over load etc. In case of TSC, each step of compensation getting

added / removed shall be protected individually by fast acting Fuses.

5.6.5 The protection system for the 27 kV/433+433 V, Single Phase, Step-

down Transformer of suitable rating shall include Differential

Protection, Earth Leakage Protection, Over Current Protections in

Primary side as well as Secondary side in each individual Panels, apart from the under voltage and over voltage protection at 25 KV

bus side.

6. General arrangement for Control of Power Quality Restorer Equipment and associated Equipments

6.1 The Control of Power Quality Restorer Equipment shall be of

outdoor/indoor type, mounted on Steel Racks, for connection to the

25 kV Bus as indicated in Drawing No. ETI/PSI/SK/326 (enclosed at Appendix-VI). The Layout Drawing with Cross Sectional details for

the „Control of Power Quality Restorer‟ shall be furnished by the

Tenderer, taking into account the existing layout of other Equipments

at the Traction Sub-station as indicated in the Drawing No. ETI/PSI/SK/326 (enclosed at Appendix-VI).


Traction System



15

The Capacitor Bank, if any, shall consist of groups of individual

Capacitor Units, connected in series parallel combination to deliver

the rated output, at nominal rated system voltage, rated frequency and other system conditions detailed elsewhere.

The Capacitor Bank, if any, shall be supplied complete with

mounting Steel Rack assembly, Inter-connectors between Units,

Fuses for Unit and Group Protection, Insulators, suitable Earthing Lugs (including Terminal Connectors) and any other material required

to make the Bank complete in all respects for its satisfactory

operation.

All Low Tension Equipment shall be indoor type, free standing

and complete in all respect from over voltage, under voltage and over current protection.

6.2 Mounting Arrangement

The Capacitor Bank, if any, Current Transformer for Unbalance

Protection and the Series Reactor shall be suitable for mounting on

Steel Racks which in turn shall be mounted on a Concrete Plinth with suitable Base frames. The Racks shall be complete with Rack

Insulator and other hardware etc.

7. Control Panels

7.1 Particulars of „Control and Relay Panel‟ for Control of „Power Quality

Restorer‟

7.1.1 The Control Panel, having the Relays for the Control of Power Quality Restorer, shall be installed in the control room of unattended Remote

controlled Traction Sub-station. The Control Panel shall be of vertical

mounting, self supporting steel construction back to back duplex corridor type. The corridor shall be provided with a lockable door at

either end permitting free access to all Instruments, Components,

Wiring, Terminal connections, Test Block etc. Stove enameled

painting shall be done on the Panel. The colour of the Panel shall be „Eau de Nile green‟ conforming to Shade 216 of IS:5-2007, on the

exterior and white on the interior surfaces. The overall height shall

be 2300 mm to match with the height of the existing Transformer and Feeder Control Panels.

7.1.2 The Control Panel shall be fabricated from a frame made of steel

section of 3 mm. thick and covered by door, side cover and top cover made of 2 mm. thick CRCA Steel Sheet. Suitable Cable entries shall

be provided from the bottom of the Control Panel for which suitable

opening shall be provided on the Bottom Plate. The Control Panel

shall be suitable for erection, flush with the concrete floor by evenly spaced grouting Bolts (projecting through the Base Channel of its

frame). The Control Panel, including the Relay housing, shall be

dust, vermin and moisture proof. The overall size of the Control Panel shall be subject to the approval of Railways.

7.1.3 There shall be provision for fixing a 240 Volts suitable Lamp for

interior lighting. The Lamp shall be switched ON/OFF with the help of

a door switch mounted at suitable location inside the Panel.


Traction System



16

7.1.4 The Protective Relays shall be mounted on the Back Panel and shall

be of semi-flush mounting type with back connections and provided

with dust proof covers and Test Plug for Secondary Injection Tests.

7.1.5 The Front Panel shall have the Control Switch, Indication Light

Emitting Diodes (LEDs), Annunciation Label, Alarm Cancellation Push

Button and a Mimic Diagram indicating connections of various equipments.

7.2 Instruments

A Switch Board type semi flush mounted Ammeter, one kVAr Meter

and one Digital Power Factor Meter, of suitable range, shall be

provided for measurement of current and kVAR of Power Quality Restorer and power factor of the TSS on the LV side of the traction

transformer. The instruments shall generally conform to IS 13875

(Part 1-3)-1993, Class A Industrial grade accuracy. It‟s circuits shall be capable of withstanding 20% overload for 8 hours. It will be

subjected to a high voltage test of 2 kV RMS for one minute. The

Instrument shall be with dust-tight case and finished in dull black

enamel.

7.3 A suitable spring return type control switch with pistol grip handle having three positions – „ON/OFF/Neutral‟ shall be provided. The

Switch shall have a sequence device to prevent two successive

movements to the same position. Following indication LEDs shall be provided for indication of circuit breaker:

i) Circuit Breaker „Closed‟ - Red

ii) Circuit Breaker „Open‟ - Green

iii) Circuit Breaker „Auto-trip‟ - Amber iv) Trip circuit „Healthy‟ - Yellow

Low consumption, extra bright, 5 mm dia., light-emitting diodes

(LEDs) shall be used wherever required. LEDs shall be suitably wired

to glow on 110 V, DC supply. LEDs shall be housed in suitable holders with glazed/polished surface to act as reflector. The holders shall be

screwed to the panel from inside.

7.4 A suitable two position (Local/Remote) „Change Over Switch‟ shall be

provided on the Control Panel for operation of Circuit Breaker from Control Panel in „Local‟ mode and from Remote Control Center in

„Remote‟ mode of this Switch.

7.5 Mimic Diagram

7.5.1 The scheme of connections at the Traction Sub-station showing the

Incoming Isolator, Circuit Breaker, Step Down Transformer, Series

Reactor, IGBT or any other superior device, the Capacitor Bank etc. shall be represented by a single line Mimic diagram on the Control

Panel. The colour of the Mimic diagram shall be golden yellow to

shade 356 of IS:5-2007.

Automatic Semaphore Relay shall be incorporated in the Mimic

diagram to indicate the position of the Circuit Breaker.

7.5.2 Open/close position of 25 kV Isolators shall be represented on the Mimic diagram by manually operated Semaphores. Push Buttons and

yellow indication LEDs, as mentioned in Para 7.3 above, shall be


Traction System



17

provided on the Control Panel to monitor the availability of 110 V,

DC supply on the Panel, and the continuity of Trip circuit for the

Circuit Breaker.

7.6 Annunciator

7.6.1 An Annunciation Label, as per Sketch at Appendix-VIII, shall be provided on front side of the Control Panel for Visual Alarm of various

fault conditions.

7.6.2 The Visual Alarm shall be of flasher type i.e. concerned LED shall

flicker and shall not become stable till the alarm is accepted.

7.6.3 The Alarm accepting and Annunciation testing Buttons shall be

mounted on the Control Panel at a convenient height under the

Annunciator Label.

7.6.4 Along with Visual Alarm, there shall be provision for an Audible

Alarm. Audible Alarm Bell shall work with 110 Volts, DC This Bell

shall be mounted inside the Control Panel. The Alarm Bell shall continuously ring when a fault is there and shall not stop ringing till

the alarm is acknowledged. A suitable Disconnection Switch shall be

provided for disconnection of the Bell.

7.7 Remote Operation

7.7.1 The 25 kV Feeding Circuit Breakers connected on primary of Step-down Transformer and fixed HT Capacitor Banks shall normally be

switched in or out by control commands issued by Traction Power

Controller of the Remote Control Centre. These Tele-commands shall be issued with the help of Supervisory Remote Control and Data

Acquisition System, hereafter called SCADA system provided at

Remote Control Centre.

7.7.2 For the purpose of Tele-commands and Tele-Signalling, suitable

Terminals shall be provided on a Terminal Block, which shall be duly

wired for the following:

i) One Tele-signal for supervision of secondary Fuse of Potential Transformer (PT).

ii) One Tele-command for operation of Control of Power Quality

Restorer Equipment Circuit Breaker. iii) Any other Tele-signals required for monitoring the

healthiness of the Transformer, Capacitor Units, IGBT or any

other superior device as recommended by the Tenderer.

7.7.3 Suitable Terminal Blocks, including Testing Terminal shall be mounted conveniently inside the Control Panel. The current rating of the

contacts shall be 30 Amps. continuous at 110 V, DC. The Current

Terminals shall be provided with short circuiting links or other suitable device. The Potential Terminals shall be housed in narrow

recesses of the Moulded Insulation Block to prevent accidental short

circuit. Terminals on the Blocks shall be Stud type crimped terminal or Lugs, securely tightened with Nuts and Spring Washers. AC and

DC Terminals shall be separate. Each Terminal shall be completely

shrouded.


Traction System



18

7.7.4 All Panel wiring shall be done with Switchboard type 1100 V grade

PVC insulated single core stranded tinned annealed Copper Cable.

The AC and DC circuits shall be kept separate.

7.7.5 Suitable space Heaters to operate on 230 V, single phase, AC supply

with „ON‟ and „OFF‟ Switches shall be provided inside the control

panel to prevent condensation of moisture in humid weather.

7.7.6 One combined three pin Switch Plug, 5 Amp. rating shall be provided

inside the Panel for using 230 V Hand Lamp.

7.7.7 Wherever required, only HRC type Cartridge Fuses of appropriate

rating, shall be used in the Control Panel at easily accessible places.

7.8 Control Panel for IGBT or any other Superior Device Control

The Control Equipment for the Control of Power Quality

Restorer Equipment scheme shall be housed in a separate Control

Panel / Control Box, the details of which shall be furnished by the Tenderer along with the offer. The Control Equipment shall be built of

Modular Units to enable easy maintenance and replacement.

8. Current and Potential Transformers

Suitable Current Transformers and Potential Transformers for the

protection of Transformer, Capacitor Bank, if any and IGBT or any

other superior device shall be supplied by the Tenderer. Full technical particulars of such Transformers shall be furnished in the

Tender offer.

9. Protection against Lightning Surges

The Equipment offered shall be adequately protected against

lightning surges. The ratings of Lightning Arresters, required for the equipment offered, shall be clearly indicated in the Tender offer. The

Lightning Arrester shall be Metal Oxide Gapless Type.

For 25 kV system voltage, 42 kV class 10 kA discharge current

Lightning Arrester shall be used. The Lightning Arrester shall be designed to withstand the full energy discharge from the Capacitor

Bank, if any or IGBT based equipment to which it is connected.

10. Earthing

Earthing arrangements shall be provided for each apparatus in

accordance with RDSO Specification No. ETI/PSI/120(7/88) “Code of Practice for Earthing of Power Supply Installation for 25 kV, AC, 50

Hz, single Phase Traction System”. The Earthing arrangement

proposed for the PQR system shall be indicated by the Tenderer.

11. Painting

11.1 Painting of Structure

All steel structures exposed to weather shall be given a priming coat of zinc chromate and two coats of light grey enamel paint as per

Shade 631 of IS:5-2007.

11.2 Painting of Cabinet

The Cabinet shall be given a primers coat of zinc chromate and two

coats of light grey paint as per Shade 631 of IS:5-2007.


Traction System



19

11.3 Painting of Capacitor Tank

The inside surface, in contact with insulation, shall be painted with

suitable anti-rust synthetic enamel primer and two coats of heat resistant, oil insoluble, insulating varnish. The Steel surfaces,

exposed to weather, shall be given a priming coat of zinc chromate

and two coats of light grey paint as per Shade 631 of IS:5-2007.

11.4 Painting of Transformer

All Steel surface which are exposed to weather shall be given one

primer coat of zinc chromate and two coats of light grey paint as per

Shade 631 of IS:5-2007.

12. Fasteners

All Fasteners of 12 mm diameter and less and exposed to

atmosphere shall be of Stainless steel and those above 12 mm dia

shall be preferably be of Stainless steel or Mild steel hot dip galvanised to RDSO‟s Specification No. ETI/OHE/18 (4/84).

13. Testing of Power Quality Restorer Equipment

13.1 General

13.1.1 Once a Purchase order is placed for supply of „Power Quality

Restorer Equipment‟ (PQR) the Design and Drawings shall be

furnished by the successful Tenderer to the Director General

(Traction Installation) / Research Designs & Standards Organisation, Manak Nagar, Lucknow, within the period stipulated in the Purchase

order.

Only after all the Design and Drawings have been approved for Prototype tests and a written advice given to that effect, shall the

successful Tenderer/Manufacturer take up manufacture of the

Prototype of the PQR Equipment. Any change or modification

required by the Director General (Traction Installation) / Research Designs & Standards Organisation, Manak Nagar, Lucknow shall be

incorporated in the Prototype expeditiously, not withstanding

approval having already being given for the Design and Drawings.

Such changes or modifications shall be incorporated in the Drawings

as indicated in Clause 15.5.

13.1.2 Prior to giving a call to the Purchaser/ Director General (TI)/RDSO for inspection and testing of the Prototype, the successful

Tenderer/Manufacturer shall submit a detailed „Test Schedule‟

consisting of Schematic Circuit Diagrams for each of the tests and

the number of days required to complete all the tests at one stretch. Once the Schedule is approved, the tests shall invariably be done

accordingly.

However, during the process of Type testing or even later, the Purchaser reserves the right to conduct any additional test(s) besides

those specified herein on any Equipment/Item, so as to test the

Equipment/Item to their satisfaction or for gaining additional information and knowledge.

In case any dispute or disagreement arises between the successful

Tenderer /Manufacturer and representative of the Purchaser/Director


Traction System



20

General (TI)/RDSO during the process of testing as regards the

procedure for Type tests and/or the interpretation and acceptability

of the results of Type test, it shall be brought to the notice of the Purchaser/Director General (TI)/RDSO as the case may be, whose

decision shall be final and binding.

Only after the Prototype PQR Equipment is complete and ready in each and every respect, shall the successful Tenderer /Manufacturer

give the actual call for the inspection and testing with at least 15

days notice for the purpose.

13.2 This Specification covers PQR system based on IGBT based systems. The Prototype test for the complete system & Main Sub-components

shall be conducted by RDSO at the time of development of first

system.

Note

(i) All Type tests shall be conducted by RDSO on the Power Quality

Restorer Equipment and its Sub-components i.e. Transformer,

Capacitor, Reactor, Control Panel etc. as per the governing

Specifications mentioned in Clause 2.1, including Annexure-B and other relevant latest IS/IEC Specifications.

(ii) PQR system manufacturer shall ensure that maximum number of

functional tests shall be carried out at their premises in the presence of RDSO representative. However only for those tests for

which facilities are not available at Firm‟s premises can be got

done at reputed Government Test Agencies/Institutions and Test Report shall be submitted to RDSO.

(iii) RDSO reserves the right to conduct these tests again whenever

major change in Design or Rating of the system or its Sub-

components is done.

(iv) (a) If some of the Equipment e.g. Current Transformer, Potential

Transformer, High Tension Capacitors, Series Reactors, Step

Down Transformer etc. of PQR system have already been Type tested (for same design & ratings) by RDSO then tests

shall not be repeated.

(b) Routine tests to be conducted by Purchaser at the Firm‟s premises for complete System & Sub-components/Equipment.

(c) Pre-commissioning tests to be done by Purchaser along with

the supplier for each system.

13.3 Pre-commissioning tests

In addition to the above tests, the following tests shall be conducted,

at site, in presence of concerned Railway Authorities to verify the performance of the „Power Quality Restorer Equipment‟ by the

successful Tenderer:-

i) Efficacy of the Discharge Device

The efficacy of the Discharge Device shall be tested through

the test provided in Clause 6 & 7 of IS:13585 (Part 1):1994.

ii) Efficacy of the Shunt Capacitor


Traction System



21

Before connecting the Capacitor Bank, the Power Factor shall

be measured on the 25 kV Busbar continuously for at least 24

hours. After connecting the Capacitor Bank, the Power Factor shall

again be measured, continuously, for at least 24 hours. The

load shall be recorded hourly in each case. The improvement in Power Factor, at different loads, shall be assessed from

these observations.

iii) Rise in Voltage due to Capacitor Bank

At different loads, the voltage at the 25 kV Busbar shall be

recorded with /and without Capacitor Bank. The rise in voltage

due to the Capacitor Bank shall be assessed from these observations.

iv) Efficacy of the Protection System

Tests shall be done to ascertain the effectiveness of the

Protection system. In case of Shunt Capacitor, one of the

Capacitor in one of the limbs shall be short circuited and its

effect shall be observed.

v) Temperature Rise

The Capacitor Bank shall be kept on for 24 hours and the temperature of one Capacitor in each of the limbs shall be

recorded hourly. The temperature of Power Transformers,

Current Transformer, Potential Transformer, IGBTs and other Equipments shall also be observed hourly during this period.

vi) Matching of characteristics of Shunt Capacitor with that of

over-voltage relay. The matching shall be verified.

vii) Harmonic Analysis

The Harmonic Analysis of the Current Waveform as well as of

the Voltage Waveform shall be carried out with and without

The Power Quality Restorer Equipment for a period of 24 hours on a normal working day.

viii) Surge Voltage Measurement

The Surge Voltage shall be measured at the time of switching

on the Capacitor. This shall be done 20 times. The voltage

peak shall not be more than 70 kVp in any case.

ix) Schedule of pre-commissioning tests on the Transformer, IGBT and the balance Equipments shall be mutually agreed upon

between the successful Tenderer and the Purchaser.

13.4 Following additional tests shall be conducted for IGBT based

Equipment as per IEC: 60146-2 (1999), Section-7. List of Tests,

required typically for 400 V, +/- 350A single Panel , single Phase IGBT based „Power Quality Restorer Equipment‟ based on above

applicable guidelines, are as below. The single Panel here is to be

treated as part of the total number of IGBT based panels supplied by the Supplier / Contractor.


Traction System



22

Part (a) Routine tests

Manufacturing process to assure the use of and proper mounting of

correct Sub-assemblies, Components, Wiring/Cabling and their

Rouging, Ferruling, use of correct Lugs and their tightness, etc.

(i) Visual Inspections : Components Data/Ratings etc. as per General Arrangement inclusive of

Auxiliary Devices (Section 7.3.1 and 2)

(ii) Wiring checks : As per the Wiring Table/Schematic,

Part of above only. (iii) Insulation test : By using 1000 V Megger (Section 7.3.3)

(iv) Basic functional tests which include Power up sequence,

Control Logic Correctness & Protective Control Circuit Functionality Check at given input voltage of 400 V and Final

Pulse Delivery from Controller but Hardware Pulse Delivery to

IGBT‟s with held (Section 7.3.5). (v) IGBT Pulse Delivery and checking the zero current mode for

IGBT based Power Quality Restorer Equipment (Section 7.3.5)

(vi) Checking the Dynamic Response with the external current

command circuit (Section 7.3.5). (vii) Rated output test of the Panel at rated voltage (Section 7.3.6)

Part (b) Type tests:

i) HV/Insulation Test (Section 7.3.3)

ii) Heat Run Test for 48 Hours or one hour after the temperature

rise is steady whichever is earlier for 400 V, 350 A (24 hrs or one hour after the temperature rise is steady which ever is

earlier) for capacitive mode and 24 hrs or one hour after the

temperature rise is steady which ever is earlier for Inductive

mode and Temperature rise (Section 7.3.8). iii) Checking Rated output of each Panel by external current

command delivery and checking of actual IGBT based Power

Quality Restorer Equipment. Current following the same in both capacitive and inductive mode (Section 7.3.6).

iv) Input current distortion check for Distortion Factor close to

unity at 400 V, 350 A for both, Capacitive and Inductive modes (Section 7.3.10).

v) Any other tests, if agreed, between the manufacturer and the

customer.

Part(C) Optional Tests (to be agreed before the supply)

(i) Dynamics +350 A to –350 A at 400 V Rated Voltage

(Dynamics not specified by IEC. Could be as per section 7.3.23 as additional test)

(ii) Heat run of each panel for full load for 2 hrs. (one hour in

capacitive mode and one hour in inductive mode). Not specified by IEC.

(iii) Visual input current distortion check w.r.t. to given waveforms

(Distortion factor close to unity) (section 7.3.10).

(iv) Power Factor Measurement Prior and post installation of PQR system.


Traction System



23

14.0 Capitalisation of losses & benefits

14.1 Benefits

Savings by any reduction in Maximum Demand, reduced losses in the

Traction transformer due to Power Factor improvement and avoidance of low power factor penalty where applicable, are to be

capitalised as indicated below:

i) Losses in all Capacitor Bank, including Fixed / Variable,

Dynamic etc.

ii) Switching losses in IGBTs or any other type of Switches that are proposed by the Tenderer,

iii) Losses in the Transformers used for the Compensation Scheme.

iv) Losses in the Reactors. v) Energy consumption for Ventilation (if any)

14.2 The losses of the Capacitor Bank (if any) shall include losses per

Capacitor unit (including Fuses and Discharge Device) multiplied by

the number of units in the Capacitor bank. The overall losses of a Capacitor unit shall not be more than 0.20 Watt/kVAR.

14.3 The benefits derived by installation of Power Quality Restorer

Equipment shall be compared against capitalisation of its cost of

procurement, installation and commissioning, Annual Maintenance Contract (AMC) charges, to obtain a Capitalised Cost, detailed

calculations for which shall be submitted by the Tenderer along with

the offer using the method given in Appendix-X. The Tenderer shall for this purpose clearly indicate the losses of the Power Quality

Restorer Equipment and expected benefits in the format given in

Appendix IX.

The Tenderer shall submit detailed calculations and the proof of

Device/Equipment data to support the calculations of losses/benefits

of Power Quality Restorer Equipment as provided by him.

15.0 Technical Data and Drawings

15.1 The Tenderer shall furnish guaranteed performance Data, Technical

and other particulars for the Equipments offered in the proforma

attached as Annexure-A. The Tenderer shall also furnish the complete protection scheme for the Power Quality Restorer

Equipment and Layout Drawings with Cross Sectional Details for the

Power Quality Restorer Equipment along with their offer.

Technical details of the protection employed, together with detailed calculation for the ratings of the Equipment shall also be furnished

with the Tender offer.

The information furnished in Schedule of Guaranteed Technical Performance, Data and other Particulars shall be complete in all

respects.

If there is any entry like “shall be furnished later” or blanks are left against any item, the Tender is not likely to be considered as such

omissions cause delay in finalising the Tender.

15.2 The Tenderer shall specifically indicate in a statement attached with

their offer, the compliance with each clause and sub-clause of this Specification. If any vague remarks on any clause or sub-clause of


Traction System



24

this Specification is given by the Tenderer, then the tender submitted

by him is not likely to be considered. A separate deviation statement

shall be furnished with the offer drawing attention to the clause(s) where the tenderer seeks deviation giving detailed

remarks/justification thereof. If there are no deviation, a „NIL‟

statement shall be furnished.

15.3 The Tenderer shall furnish the following calculations with their offer.

i) Detailed calculations for rating of Capacitor Bank, Series

Reactor, Inrush Current, Transient Over-voltage, Parallel and

Series Resonant Frequencies. ii) Calculations for Protection scheme offered.

iii) Calculations for Design of Supporting Frame, Fixing

Arrangement and Foundation.

15.4 The following Drawings shall be furnished as per Indian Railway Standard (in sizes of 210 mm x 297 mm or any integral multiple

thereof):-

a) Outline General Arrangement Drawing giving the overall

dimensions of the Capacitor Bank installation. b) Schematic Circuit Diagram (with Description of function and

working of each Component) and Wiring Diagram

c) Arrangement of Capacitor Bank, IGBT, Transformer, Series Reactor, Circuit Breaker, Isolator, Lightning Arrester, Current

and Potential Transformers.

d) Arrangement of Core Winding and Magnetic path of Series Reactor and Transformer.

e) General Arrangement of Circuit Breaker, showing mounting

arrangement and overall dimensions

15.5 The successful Tenderer shall be required to submit for approval the

following Detailed Dimensioned Drawings as per India Railway standard (in sizes of 210 mm x 297 mm) or any integral multiple

thereof in latest version of Auto CAD.

a) Outline General Arrangement Drawing of the Power Quality Restorer Equipment installation indicating necessary

dimensions, clearances and location of equipment/fittings (all

the 3 views). b) Internal Arrangement of Series Reactor and Transformer

including cross-sectional views in both Plan and Elevation.

c) Schematic Circuit Diagram (with description of Function and

working of each component) and Wiring Diagram. d) Supporting Frame with details of Fixing Arrangement and

Foundations along with calculation for their Design.

15.6 After approval of Design and Drawings by the Director General (TI),

RDSO, Lucknow the Tenderer shall manufacture an acceptable prototype of Power Quality Restorer Equipment as per approved

Drawings. The Prototype inspection shall be carried out by the

representative of Director General (TI), RDSO. The Bulk

manufacture shall be taken up only after approval of prototype by Director General (TI), RDSO, Lucknow.

15.7 Routine inspection shall be carried out by the representatives of

Indian Railways at the manufacturer‟s works.


Traction System



25

15.8 After approval, six copies of Approved Drawings along with two sets

of Reproducible Prints shall be supplied to each consignee(s).

Besides, two copies of Drawings along with one set of reproducible prints shall be supplied to Director General (Traction Installation),

Research Designs and Standards Organisation, Lucknow (India).

15.9 The successful Tenderer shall supply 3 copies of Instruction/Maintenance Manual of the Power Quality Restorer

Equipment installation and its Fittings and Accessories, to each

Consignee(s) and 2 copies to Director General, Traction Installation,

Research Designs and Standards Organisation, Manaknagar, Lucknow-226011 (India).

16. Additional particulars

The Tenderer shall visit the Traction Sub-station location, if necessary, and collect any additional data/details required for the

design of the Power Quality Restorer Equipment and the Series

Reactor / Surge Suppression Equipment. It would be the

responsibility of the Tenderer to visualise the problems and understand the system conditions before evolving a suitable Design.

17. Erection, Testing and Commissioning

The Power Quality Restorer Equipment installation shall be erected by

the successful Tenderer under the supervision of a competent engineer of the successful Tenderer/Manufacturer/ Supplier. The

Power Quality Restorer Equipment installation shall be subjected to

the specified proving/pre-commissioning tests by the Railway engineer at site and with which the successful

Tenderer/Manufacturer/Supplier shall also be fully associated. For

this purpose prior intimation regarding the date and location of the

tests shall be given by the purchaser to the successful tenderer/manufacturer/supplier.

18. Spare parts, Catalog & Support commitment

The Tenderer shall furnish along with his offer a list of spares (with

cost), recommended by him for maintenance of Power Quality Restorer Equipment installation for a period of 2 years.

19. Training of Indian Railways‟ Engineers

The offer shall include the training of two engineers and four

technicians of the Indian Railways free of cost at the manufacturer‟s

Works in India or abroad and at the Traction Sub-station of a Railway system or other public utility where Power Quality Restorer

Equipment of similar/identical design are in operation. The total

duration of training for each Engineer/Technician shall be 4 weeks of which approximately 2 weeks shall be at the manufacturer Works

and 2 weeks on a Railway System or public utility. The cost of travel

to the country of manufacture and back shall be borne by the Indian Railways.

***********


Traction System



26

ANNEXURE-A

SCHEDULE OF GUARANTEED PERFORMANCE

TECHNICAL AND OTHER PARTICULARS

A- SHUNT CAPACITOR

S.No. Description Unit of

measurement

1. Maker‟s name

2. Country of manufacture

3. Manufacturer‟s type (Designation)

4. Location of capacitor bank (Outdoor/Indoor)

5. Nominal Rated System Voltage kV

6. Rated Voltage of Capacitor Unit

IS-13925(Pt.1):1998

kV

7. Maximum Voltage (RMS), which the Capacitor unit can

withstand continuously.

kV

8. Rated Frequency Hz

9. No. of Phases No.

10. Upper limit of Temperature category 0C

11. Capacity of individual unit at Rated Voltage of the unit kVAR

12. i) Continuous current rating of individual Capacitor Unit A

ii) Maximum inrush current at the instant of Switching A

13. Basic insulation level of unit

a) Power Frequency Voltage Withstand b) 1.2/50 micro-second impulse withstand voltage

kV(rms) kV(peak)

14. Basic Insulation Level of complete Capacitor Bank:

a) Power Frequency Voltage Withstand

b) 1.2/50 micro-second Impulse Withstand Voltage

kV(rms)

kV(peak)

15. Transient current withstand capacity of each unit kA

16. Constructional details of Capacitor unit

i) Dielectric Material

ii) Foil Material & Thickness iii) Impregnating liquid used and its properties

17. Total Maximum losses per kVAR/unit at rated voltage

and at 50 Hz

Watts/kVAR

18. Capacitor Unit i) No of Elements in Series

ii) No. of Parallel Paths

iii) Capacitance of each unit.

No.

No.

Micro farad

19. Capacitor Bank i) No. of Series Groups

ii) No. of Parallel Units in each group

iii) Capacitance of the Bank

No.

No.

Micro farad

20. Internal Fuse

i) Type of Internal Fuse Elements of Capacitor Unit

ii) Length of Fuse element

iii) Cross section of fuse element iv) Circumference of fuse element

v) I2t characteristics

-

mm

Sq.mm mm

-


Traction System



27

vi) Time Factor(t) of Internal Fuse Element Second (under

Maximum

energy condition)

Second (under

Minimum

energy condition)

21. Reference to the Time/ Current characteristics of the

Fuse element

22. Discharge device i) Type

ii) Location

iii) Time interval between De-energisation and Re-energisation

iv) Residual Voltage after an interval of 10 minutes

of De-energisation

Minutes

Volts.

23. Bushings i) Maker‟s Name

ii) Governing Specification

iii) Wet-one minute Power Frequency Voltage withstand

iv) Impulse Voltage Withstand 1.2/50 microsecond

Full Wave v) Creepage Distance in Air.

vi) No. of Bushings in each unit

kV(rms) kV(peak)

mm

No.

24. Overall dimensions

i) Capacitor unit ii) Complete Capacitor Bank

mm. mm.

25. Weight per unit kg

26. Weight of the Complete Bank kg

B – CONTROL & RELAY PANEL

1. Name of manufacturer and address

2. Overall Dimensions

i) Length ii) Width

iii) Height

mm mm

mm

3. i) Colour of the Panel

ii) Colour of the Mimic

4. Details of Switches provided and their make

5. Annunciations provided

6. Size of Wires used for:

i) Control Circuit ii) Indication Circuit

iii) General Wiring

iv) PT and CT Circuits

7. Method of Cable Entry

8. Details of Instruments, if any provided


Traction System



28

C – PROTECTIVE RELAYS OF CAPACITOR BANK

1. Instantaneous over current Relay

i) Type and Make of Relays offered

ii) Setting range in current available

2. Over Current i) Type and Make of Relays offered

ii) Setting range in current available for Over

Current Relays.

3. Over-Voltage Protection

i) Type and Make of Relay offered

ii) Setting range available

4. Unbalance Protection i) Whether voltage operated or current

operated Relays are used.

ii) Setting Range available in the Relays. iii) Calculations to show the No. of Capacitor

Units which when fail shall produce the rated

Over voltage on other Capacitor Units and

the setting range available in the relay offered suits the same, shall be enclosed.

iv) How provision of Alarm in the case of failure

of one or two Capacitor Units has been achieved.

v) Details (Type and Make and setting range) of

the Time Delay Relay. vi) Calculations to show that co-ordination

between the operation of individual fuses to

isolate faulty units and the unbalance

protection exists, should be appended.

5. The required capacity of Current Transformer and

Potential Transformer in VA

NOTE – The Tender shall be complete with three sets (one with each copy) of technical Literature and Pamphlets of the Relay used.

D – PROTECTION OF 25kV / 433 V TRANSFORMER

1. The Tenderer shall furnish details of Protection proposed for the 25kV/ 400V Transformer

E – PROTECTION OF IGBT

The Tenderer shall furnish details of Protection

proposed for the IGBTs.

F –REACTOR IN SERIES WITH LC CIRCUIT

1. 1. Name of Manufacture

2. Governing Specification

3. Type of Reactor

4. Rated Current and Voltage 5. Rated frequency

6. Rated impedance

Amps/Volts Hz

Ohms


Traction System



29

7. Inductance of Series Reactor

8. Resonance Frequency of the system, including

Shunt Capacitor and Series Reactor. (Details of calculation shall be enclosed )

9. Value of the Peak Surge voltage generated at

the time of switching in of Shunt Capacitor

(calculations shall be appended) 10.Short Circuit Rating for 3 seconds

11.Overall Dimensions of the Series Reactor

12.Total weight of the Series Reactor 13.a) No. of Tappings on the Series Reactor

b) Minimum Inductance

c) Maximum Inductance

mH

Hz

kV

kA

mm

kg No.

mH

mH

NOTE: S.No. (4) to (13) above shall be furnished for each branch setely. In case Resistance & Capacitance circuit or any other surge suppression

circuit is proposed to be used, complete details thereof shall be

furnished.

G-IGBT

1. Maker‟s name

2. Country of manufacture

3. Manufacturer‟s type designation

4. Standard specification on which performance

data are based

5. Device configuration

6. Type of device PT/NPT/SPT/Trench

7. Collector Emitter Voltage V

8. Gate Emitter Voltage V

9. Collector current at continuous Tc of 25 deg.

Celsius

A

10. Collector current at continuous Tc of 80 deg.

Celsius

A

11. Operating temperature oC V

12. Isolation voltage V

13. Max. collector Emitter Saturation Voltage V

14. Total gate charge Qge nC

15. Turn-on Delay Time td(on) s

16. Rise Time tr s

17. Turn-off delay time td (off) s

18. Fall time tf s

19. Turn-on switching energy Eon s

20. Turn-on switching energy Eoff mJ

21. Forward Voltage VF mJ

22. Reverse recovery current Irrm V

23. Reverse recovery charge Qrr C

24. Reverse recovery time trr s

25. Reverse recovery energy Erec mJ

26. Module stray inductance nH

27. Cumulative Thermal Resistance (Rj-c) of the device

oC/W

28. Preferred type of cooling W


Traction System



30

29. Maximum operating and storage temperature oC

30. Mounting force, terminals as well as modules Nm

31 Alternatively complete data sheet of the IGBT

from the manufacturer

32. Conduction Loss

33. Switching Loss

34. Switching Frequency

H- Step Down transformer(25kV/433V)

1. Name of the manufacturer

2. Country of origin

3. Standard specification on which the performance

data are based

4. Continuous rating for specified cooling,

temperature rise and ambient temperature

kVA

5. Rated temperature rise under normal operating

conditions over an ambient of 45o

a) of oil by thermometer

b) of winding by resistance

oC oC

6. Rated primary voltage kV

7. Rated secondary voltage kV

8. Exciting current ref erred to HV and at 50 Hz at

100% rated voltage.

A

9. Power factor of excitation current at 100% rated voltage

10. Iron loss at 50 Hz, and 100% rated voltage W+%

11. Coppr loss at (75o) at rated load W+%

12. Total loss W+%

13. Resistance voltage (at 75o) at full-load of a) HV winding

b) LV winding

(All values shall be refer red to the HV)

V+%

V+%

14. Reactance voltage (at 75o) at full load (referred

to the HV)

V+%

15. Impedance voltage (at 750C) at full load (referred

to the HV)

V+%

16. Resistance of HV winding (at 750C)

Ohms

17. Resistance of LV winding (at 750 C) Ohms

18. Regulation at full load (at 750 C)at 0, 0.1 power

factor(leading) at

100 % load 75% load

50% load

% %

%

19. Withstand time without injury with dead short

circuit at the terminal

Seconds

20. „Ideal heating time‟ or the thermal time constant

of windings

Minutes

21. a) Type of core b) Flux density in the core at rated voltage and

50 Hz.

Tesla

mm


Traction System



31

c) Thickness of iron stampings

d) Insulation between the core laminations

(material)

22. a) Type of windings

b) Size of conductors

c) Current density in: i) HV winding

ii) LV winding

d) Insulation on the copper conductor e) Insulation withstand strength of windings with

1.2/50 μs wave: HV

i) Impulse full wave

ii) Impulse chopped wave f) Applied voltage test – LV

g) Induced voltage test –HV

h) Min. flashover distance to earth through oil between –

i) LV and core

ii) HV and yoke i) Estimated switching surge withstand

HV LV

mm2

A / mm2

A / mm2

kV(p)

kV(p) kV(rms)

kV(rms)

mm

mm

kV(p)

23. Tap changer, if provided –

a) whether on primary or secondary side

b) type of tap changer c) number of plus taps and minus taps

d) Volt per steps

V

24.

Bushings:

Primary

HV end.

Primary

earthed

Secondary

side

a) Name of manufacturer

b) Country of origin

c) Standard specification on which the

performance data are based

d) Type of bushing

e) 1.2/50 s Impulse withstand

kV(p)

(full wave)

f) One minute dry power frequency

withstand kV (rms)

g) One minute wet power frequency

withstand kV(rms)

h) Puncture voltage kV(rms)

25. Net weight of core kg.

26. Net weight of copper

a) HV b) LV

kg. kg.

27. Net untanking weight of core, frame and oils kg.

28. Net weight of insulating oil kg.

29. Volume of insulating oil Litres

30. Total weight of transformer-less oil Tonnes


Traction System



32

31. Dimensions of the assembled transformer

a) Under base to the top most point

b) Overall breadth c) Overall length

d) Minimum thickness of plate

Tank – sides

Tank – bottom Tank - cover

mm

mm mm

mm

mm mm

I – CONTROL OF IGBTs

The tenderer shall furnish full technical particulars of the control equipment

used for the control of IGBTs.

J – SURGE ARRESTORS

The tenderer shall furnish full technical particulars of the surge arrestors

offered.

K - CAPACITOR USED IN THE VOLTAGE SOURCE INVERTOR

The tenderer shall furnish full technical particulars of the Capacitor used in

the Voltage Source Invertor offered.


Traction System



33

ANNEXURE-B

Associated specifications to Power Quality Restorer Equipment

i IS : 5-1994 Colour for ready mixed Paints and enamels

ii IS : 513-1994 Cold rolled low carbon steel sheets and strips

iii IS : 800-1984 Code of practice for use of structural steel in

general building construction

iv IS : 1554 : (Pt.2) PVC insulated (heavy duty) electric cable for working voltages from 3.3kVupto and

including 11 kV.

v IS : 2026 (all parts) Power transformers

vi IS : 2099-1986 Bushing for alternating voltages above 1000 volts

viii IS : 3070-1986: (Pt.I) Surge arrestor for a.c. systems, non-linear

resistor type

ix IS : 3231(all parts) Electrical relays for power system protection

x IS : 3700(all parts) Essential ratings and characteristics of semi-

conductor devices.

xi IS : 5553-1990:(Pt.II) Series reactors

xii IS : 11298-1991:

(Pt.3/Sec.1)

Specification for plastic films for electrical

purposes -polypropylene film for capacitors

xiii IS : 13947-2 Air circuit breakers

xiv IS : 12672-1989 Internal fuse and internal over pressure

disconnectors for shunt capacitors

xv IEC-60871-1 Shunt capacitors for a.c. systems having a

rated voltage above 1000 V.

xvi IEC-60871-2 Shunt capacitors for a.c. systems having a

rated voltage above 1000 V (Endurance

testing).

xx RDSO Specification No.: ETI/OHE/13(4/84)

With A&C slip No.1 to 3

Specification for hot dip zinc galvanization

xxi RDSO Specification No.: ETI/OHE/18(4/84)

With A&C slip No.1to 4

Specification for steel and stainless steel, nuts and washers steel bolts

xxii RDSO Specification No.:

ETI/PSI/65(1/97) With A&C slip No.1 to 2

Specification for Control and relay panel.

xxiii RDSO Specification No.:

TI/SPC/PSI/CB/0000

Specification for Outdoor circuit breakers for

Railway ac Traction substations.

xxiv

RDSO Specification No.: ETI/PSI/120 (7/88)

Code of practice for earthing of power supply installation for 25 kV a.c., 50 Hz single phase

traction system.


Traction System



34

APPENDIX – I

RELATED EQUIPMENTS AT TRACTION SUB-STATIONS

1.1 Traction Power Transformer

Two Nos. 12.5 MVA, 132/25 kV, with off load Tap-changing

gear having tappings from (+) 10% to (–) 15 % in steps of 5% and

an impedance of 10 to 12.5%. The Transformers are designed to carry short time overloads of 50% for 15 minutes and 100% for 5

minutes.

OR

Two Nos. 21.6 MVA, 220/25 kV, 132/25 kV, 110/25 kV, 66/25kV with off-circuit tappings from (+) 10% to (–) 15% in steps

of 5%. Percentage impedance voltage at 21.6 MVA base is

(12.0±0.5)% at the Principal Tap position. The Transformers are

designed for non-cumulative overload capacity, after it has reached steady state temperature on continuous operation with over load of

50% for 15 minutes and 100% for 5 minutes.

1.2 25 kV Transformer & Feeder Circuit Breaker

SF6 gas/Vacuum Circuit Breaker, 550 MVA, 1600 amps.

1.3 25 kV Potential Transformer

Ratio 25 kV/110 V, Burden 100 VA, Accuracy Class 3P and Rated

Voltage Factor 1.2.

1.4 25 kV Current Transformer

Ratio 1000 – 500/5A or 1500 - 750/5A, Accuracy Class 5p, Accuracy

Limit Factor 15.

1.5 25 kV Isolator

Air Break, Single/Double Pole (630/800/1250 Amps.)

1.6 42 kV Lightning Arrestor

Non linear Metal Oxide Gapless type, Nominal Discharge current 10

kA (8/20 Wave). Maximum Discharge Voltage at Nominal Discharge

Current 125 kVp.


Traction System



35

APPENDIX – II

GENERAL SCHEME OF SUPPLY FOR 25 kV, 50 Hz, SINGLE PHASE TRACTION SYSTEM


Traction System



36

APPENDIX- III A


Traction System



37

APPENDIX- III B


Traction System



38

APPENDIX – III C

INFORMATION FURNISHED BY RAILWAYS (In terms of Para 4.8.1)

3.1 Traction Sub-station location : __

3.2 Transformer Capacity : __ MVA

3.3 Transformer Impedance : __%, angle__degrees

3.4 Details of existing Capacitor Bank, if any : __ KVAr

3.5 Average Power Factor, as obtaining : __

3.6 Typical Maximum Demand, as existing : __ kVA

3.7 Prevalent Average monthly Energy consumption : __ kWH

3.8 Contract Demand : __ kVA

3.9 Tariff - Fixed Charge : Rs.__per recorded

MD kVA

- Energy Charge : Rs.__ per KWh

- Penalty for exceeding CD : Rs.__ per KWh

- Surcharge for low Power Factor:

3.10 Typical Daily Load Cycle

Maximum Demand

kVA

120%

of CD

>100 upto

120%

>70 upto

100%

>40 upto

70%

40%

Total

Hours per day

24


Traction System



39

APPENDIX – IV


Traction System



40

APPENDIX – V

SCHEMATIC DIAGRAM FOR THE PROTECTION OF TRACTION TRANSFORMERS & OHE


Traction System



41

APPENDIX- VI


Traction System



42

APPENDIX- VII


Traction System



43

APPENDIX- VIII

BENEFIT/LOSS INFORMATION TO BE SUBMITTED BY THE TENDERER

(in terms of Para 14.3)

Before

Compensation

(As given by Railways)

(1)

Maximum

Demand

(KVA)

(2)

120%

of CD

(3)

>100%

upto

120% (4)

>70%

upto

100% (5)

>40%

upto

70% (6)

40%

(7)

Total

(8)

Hours per day

After

compensation

MD in KVA

Average PF**

Analysis of

Losses

Capacitor

Bank losses KW (+)

Switching

losses KW (+)

Reduction in

Losses in

Traction Sub-station

Transformer

after compensation

KW (-)

Losses in LT

Transformer & Reactor

KW(+)

Ventilation

Power KW(+)

Net Loss

KWh (+)

Remark NB1 NB2 NB3 NB4 NB5

** Average Power Factor over any period of time

= MWHr consumed over that period

MVAHr consumed over that period

NB1 – Calculation of net loss shall be done for 120% of CD

NB2 – Calculation of net loss shall be done for 110% of CD

NB3 – Calculation of net loss shall be done for 85 % of CD

NB4 – Calculation of net loss shall be done for 55 % of CD NB5 – Calculation of net loss shall be done for 20 % of CD


Traction System



44

APPENDIX-IX

METHOD FOR CALCULATION OF CAPITALISED COST

1.0 Data for calculation of Capitalised Cost

1.1 Net loss “L” in KWh per day as per information furnished by Tenderer

in Appendix VIII, Col.8.

1.2 Cost of procurement, installation & commissioning of Power Quality Restorer Equipment including construction of covered area for

housing indoor equipment as quoted by Tenderer: Rs “Y”

1.3 AMC charges per annum as quoted by Tenderer: Rs “X”

1.4 Period of capitalisation assumed: 15 years

1.5 Discount rate of 7% assumed for calculation of Net Present Value of

Benefits and Costs

2.0 Calculation of Capitalised Cost

2.1 If the monthly saving in fixed charges by reduction in MD arising of

the installation of Power Quality Restorer Equipment is M, then the

capitalised benefit B1 shall be given by:

B1=(12*M)[(1.07)15-1] = (12*M)*9.107 0.07(1.07)15

2.2 If the monthly saving in low Power Factor penalty charges arising of

installation of Power Quality Restorer Equipment is P, then the

capitalised benefit B2 shall be given by:

B2=(12*P)[(1.07)15-1] = (12*P)*9.107

0.07(1.07)15

2.3 If the monthly cost in Energy charges for net losses of L KWh/day is Cm1, then the capitalised cost C1 shall be given by:

C1=Cm1*12*[(1.07)15-1] = (12*Cm1)*9.107

0.07(1.07)15

2.4 The capitalised cost C2 of AMC charges shall be given by:

C2= X * [(1.07)15-1] = (X)*9.107

0.07(1.07)15

2.5 Then the total capitalized cost C of Power Quality Restorer Equipment

shall be given by:

C= Y +C1+ C2 – B1-B2

technical specification for power quality restorer · pdf filespecification for power quality...

Documents