kar · 2020. 11. 6. · kar

MOM of 171st OCC Meeting held on 09.10.2020

Southern Regional Power Committee, Bengaluru

Minutes of the 171st Meeting of

Operation Co-ordination Sub-Committee (OCC)

(held on 09.10.2020 through WebexVC)

1. Introduction

1.1 The 171st Meeting of Operation Coordination Committee of SRPC was held on

09th October 2020 at SRPC, Bangalore through Webex video conference. The

list of participants is given at Annexure-1.1.A.

1.2 Shri A Balan, Member Secretary, SRPC and Chairperson of Operation

Coordination Sub-Committee (OCC) of SRPC extended a warm welcome to all

the members and participants to the 171stOCC Meeting. He stated the following

on the grid operation side:

a) During September 2020:

i. Grid operated at a frequency 50 Hz. and above at around 56.44%

of time which is a matter of concern.

ii. Energy Consumption during September 2020: 25272 MU: 1139

MU less compared to September 2019 (26411 MU)

iii. Maximum Demand met during September 2020: 44625 MW: 34

MW more compared to September 2019 (44591MW).

iv. Storage in reservoirs as on 7th October 2020: 12996 MU: 673 MU

less compared to 7th

October 2019 (13669 MU).

v. On 08.10.2020 SR Demand was 6133 MW more than last year

same day. SR consumption was 108 MU more than last year same

day which indicates picking up of loads (which was less due to

Covid) and power consumption may increase.

b) A meeting was held to discuss on Ramagundam Islanding Scheme on

23.09.2020 and the minutes are available at SRPC website.

c) As decided in the 170th OCC Meeting, a meeting was held between SRPC

& SRLDC on 14.09.2020 to discuss on the scheduling / accounting issues

during primary frequency response testing of generators as per IEGC

5.2.g. After deliberations a testing procedure was recommended. OCC

may approve the procedure.


d) Second SRPC TP Meeting was held on 01.10.2020 through Video

Conference. He requested all the concerned to check whether all the

Station Names are spelt correctly, Schemes are correctly pictured so that

there won’t be any issue in future correspondences.

e) A special Meeting was carried out to discuss on High voltage issues in

Telagana System on 05.10.2020. All the States will be covered in

forthcoming months in order to have concrete plan to mitigate these

issues.

f) A Meeting w.r.t to RSD was convened on 19.08.2020 and 03.09.2020

through WebEx VC. It was agreed that the RSD proposal would be

implemented on Trial Basis for two months. Beneficiaries (including

PGCIL, Goa and Odisha) are requested to give their concurrence for trial

operation for two months. TS, KER , PGCIL SR I and Goa had intimated

their concurrence. All others were requested to concur for the same.

g) A web meeting on schedule fixation methodology adopted in SR was

held on 15.05.2020. The Minutes of the meeting was issued on

22.05.2020 and the same is available at SRPC website. Advantages and

disadvantages in the existing methodology in SR and other regions were

analyzed. After deliberations the beneficiaries were requested to revert

back on their choice. Majority of constituents agreed for adopting all

India schedule fixation methodology in Southern Region. SRPC Forum

had suggested to take up the implementation of the same by SRLDC.

SRLDC had informed that SRLDC has taken up with the developer for

implementation of the above and required changes were incorporated in

the Web Based Scheduling program (WBES) w.e.f 00:00 hours of 20th

September 2020.

h) PGCIL have informed that Raigarh-Pugalur SPS-1 signal has been

taken into service w.e.f 16:00 hrs of 24.09.2020. NLDC Code and

SRLDC code were taken.

i) Due to Covid -19 pandemic, SRPC is unable to Audit the Sub-Stations.

Therefore, as discussed in the COM SR October 2020 meeting held on

17.09.2020, a list of officers comprising 2 from each Entities were

selected for Audit. SRPC vide letter dated 18.09.2020 had requested that

the Nodal Officers may kindly arrange to conduct the audit in respect of

their Sub-Stations listed in Annexure of the letter, fill the Audit Format


attached , which is also available in the SRPC Website and submit to

SRPC e-mail ([email protected]) by 30.11.2020.

j) From MoP the following could be noted :

i. MoP vide notification dated 01.10.2020 had published Draft

Electricity (Change in Law, Must Run status and other

Matters)Rules, 2020. These rules are proposed for pass through in

cases of Change of Law and compensation to RE generators for loss

of generation due to non-scheduling by the procurers/intermediary

procurers. The comments are requested by 22.10.2020. He requested

all RE rich states to go through the Notification and furnish their

comments/observations within the stipulated time.

ii. Draft SBD- Guidance Note to SBDs for Privatization of Distribution

Licensees : The Ministry of Power had issued the Standard Bidding

Documents (SBD) for encouraging and supporting acceleration of

Private Sector Participation (PSP) in power distribution utilities across

the country.

1.3 ED SRLDC welcomed all to the meeting. He appraised about the growth in

demand observed during last few days. Wind generation is coming down. Some

LGB issues are noticed during night hours when solar generation coming down

and demand goes up. Frequency is hovering below IEGC band. Such high

deviation especially at low frequency is a cause of concern. It is imperative for

each control area to restrict the drawl within schedules at all times by ensuring

appropriate proactive/real time measures. He highlighted the need for

implementation of RSD procedure in the present scenario of increasing load.

Few states had concurred for two months trial operation. He requested others to

furnish the official communication concurring for the trial operation.

Implementation of RSD procedure will help in utilizing the available generation

optimally. Raigarh – Pugalur one line has come, which is great relief for

importing power. NNTPP Unit II has got extension from CERC to draw

commissioning power till November 2020. Commissioning of NNTPP will also

help in meeting the demand in peak months. Devanahalli connectivity will be

replaced by 10.10.2020 which is need of the hour. Communication availability

is a regulatory requirement, SRLDC and SRPC had nominated the committee

members and requested the concerned to nominate for the committee.

1.4 MS, SRPC requested SE (Operation) to take up the agenda items for discussion.

mailto:[email protected]


2. Confirmation of the Minutes of the 170th

Meeting of OCC of

SRPC held on 11th

September 2020 through Webex

The Minutes of the 170th OCC was issued on 28.09.2020 .No comments were

received from any of the entities and the minutes of the 170th

OCCM were

confirmed without any modifications.

3. NEW ISSUES

3.1 Utilization of Decommissioned Thermal units as Synchronous

condensers.

a) NLDC in its operational feedback (April to June 2020) had mentioned the

following:

i. Present installed capacity of RE in Southern Region stands to be 35% and

Southern Region has experienced maximum of 30 % RE penetration over a

day with reference to demand met. And many of the thermal units are kept in

Reserve Shut Down (RSD).

ii. According to the Flue-gas desulfurization (FGD) phasing plan, Kothagudem

thermal power station Unit-1 to Unit-8 (4x60+4x20) were already

decommissioned and the Neyveli Thermal Power Station-1 units will also be

decommissioned gradually. Shutting down of the thermal units coupled with

continuous increase in amount of renewable energy into the grid might impact

the system inertia. Hence, it is proposed that Synchronous machines in

decommissioned plants (NLC STG1) and KTPS STG1) may be converted into

synchronous condensers for providing inertia and reactive support.

iii. Considering the above issues, a study may be conducted on utilizing the

decommissioned generating units as synchronous condensers for providing the

grid inertia. In addition to inertia, these units can also be used for providing the

reactive power support (injection/absorption) to the grid which would help the

grid in maintaining better voltage profile.

A. Deliberations

i. SRLDC informed the in the scenario of increasing RE penetration most of the

Thermal Units will be under RSD and the inertial and reactive support

receiving from conventional generators will be jeopardized. The feasibility of


utilizing the decommissioned units for providing inertia as well as reactive

power may be explored. There was a Meeting held with CEA regarding this

issue and in which one of the vendors had given a presentation in this regard.

Space required is quite less since there is no boiler and turbine requirement

and the existing infra-structure could be utilized in an optimal way. For

increasing inertia additional flywheel also may be thought off. Supporting the

voltage during the fault, synchronous condensers will be helping by providing

dynamic VAR.

ii. W.r.t. decommissioned at Kothagudem, DE, TSTRANSCO informed that they

had informed TSGENCO authorities and they are exploring the possibilities.

Once they come up with their views it will be informed accordingly.

iii. With respect to decommissioned Ennore TPS, TANTRANSCO informed that

as of now there is no overvoltage issues at that pocket. Since all the lines from

Ennore Stage I is removed at present further studies are required before taking

decision in this regard.

iv. SE(O), requested TANTRANSCO to explore the possibility since this will help

in providing dynamic VAR(absorption/injection).

v. ED, SRLDC underlined that this is a need of the hour and requested all to

discover the possibility of this proposal. After receiving the views from

generators, the proposal may be taken up to higher forums for Commercial

Mechanism.

vi. MS SRPC stated that many modifications are required, control system needed

to be changed, to keep the lines in service O/M cost may come. He pointed out

that commercial aspects such as tariff/incentive terms needed to be looked into.

He opined that detailed study needed to be carried out to assess modification

time/cost, recurring cost to maintain the lines. To attract the generators to

participate in this proper incentive scheme may be framed. Comparison on cost

for using the decommissioned units and new ones to be done. A presentation

on synchronous condensers/ Technology for converting generators to

synchronous condensers by GE is being planned in next week. After that a

separate meeting may be convened with generators and SLDCs to discuss on

the same.

B. Conclusion


i. The technical feasibility/willingness to go for the proposal/cost aspects /

time envisaged for modification etc. needed to be explored.

ii. SRLDC stated that this is a requirement of the hour and requested all to take

a positive approach towards this and commercial part can be taken up with

higher bodies accordingly.

iii. A Special Meeting would be convened with Generators, SLDCs and

GENCOs in this regard.

3.2 SPS for +/- 500 kV Talcher-Kolar HVDC system & lines

a) SR II, PGCIL vide their letter dated 17.09.2020 (Annexure-2.2.A) had noted the

following:

i. SPS scheme in place for Talcher-Kolar system for automatic load shedding /

Generation control during forced outages. This scheme was conceived in 2003

considering the available alternate transmission corridors at that point of time.

Subsequently several corridors were commissioned for evacuation of power

from Talcher station. The following corridors are available which will be able

to handle 2000 MW.

1. Talcher – Jharsguda – Raigarh – Pugalur

2. Talcher – Jharsguda – Raipur– Chandrapur – Ramagundam

3. Talcher – Angul - Srikaklam – Vemagiri– Chilakaluripeta

4. Talcher – Meramudali – Jaypore – Gazuwaka

5. Talcher – Rangali – Indravathi - Jaypore – Gazuwaka

6. Talcher – Jharsguda – Raipur– Wardha – Nizamabad

7. Talcher – Jharsguda – Raipur– Warora – Warangal

b) In view of the above, backing down of generation may not be necessary at

Talcher. During the 165th OCC meeting held on 13.03.2020 at SRPC, Bengaluru,

SRLDC has informed that review of SPS issue (Talcher II generating backing

down/unit tripping) had already been taken up with NLDC and NLDC would be

visiting SRLDC in a week time for mutual discussion and revised scheme would

be finalized and would be deliberated in due course. PGCIL requested SRPC to

kindly take up the issue at the earliest.

c) In the 169th

OCC Meeting SRLDC had informed that a preliminary discussion

on SPS for tripping/run back of Talcher Units when both Talcher- Kolar pole

goes out was carried out among NLDC/ERLDC/SRLDC and most likely the

inter trip was to stay. As the lines from Talcher to Meramudali was straightened


from Angul. Two lines are at different lengths and flow on one line is higher

causing N-1 issue whenever there is a pole outage and flow crosses 800 MW

dependent on antecedent condition. This was informed to SRLDC as well as

CEA in the meeting on Tacher Back up. However, further deliberation would be

held between RLDCs and NLDC and subsequently it would be put up to

ERPC/SRPC OCC.

A. Deliberations

i. SE (O), SRPC opined that there may be a need for reviewing the SPS considering

the enhancement in ER Transmission system. He requested SR II and SRLDC

to give their views.

ii. SR II, PGCIL informed that SPS scheme was conceived in 2003 considering the

available alternate transmission corridors at that point of time. Subsequently

several corridors were commissioned for evacuation of power from Talcher

station and backing down of generation may not be necessary at Talcher.

iii. SRLDC informed that the SPS for Talcher lines at Talcher involves

tripping/back down at Talcher Stage II was already reviewed. Two schemes are

existing, SPS 400 and SPS 1000. Many rounds of discussions had been carried

out between NLDC/ERLDC and SRLDC in this regard and a tentative scheme

had been formulated. After finalization (expected within two weeks), the

proposed scheme would be put up to WRPC/SRPC OCC.

iv. Talcher, NTPC informed that the load flow is taken from HVDC flow and not

from Talcher Stage II Exbus generation. There are 6 lines available from NTPC

switchyard to ER and there won’t be any evacuation problem and SPS for run

back/tripping of units may not be required. He suggested that a scheme may be

formulated for run back (not unit tripping) of Talcher generation in case Talcher

- Maramundali line flow goes beyond 800 MW.

v. SE(O), SRPC suggested that before finalizing the tentative scheme NLDC may

call a joint meeting keeping in loop all the stake holders and may be validated

with studies.

vi. In the Grid Maps many nodes are not clear and voltage levels also not mentioned

properly. There is direct link between Talcher Stage II bus and Stage I bus and

evacuation is through lines from Stage I. He requested to NTPC to explain the

connectivity. He desired to know the Capacity of Interlink between two stages.


vii. NTPC Talcher informed that Talcher have 6 no of buses. From Bus I & II there

are six lines connected to ER Corridor. When HVDC poles are out the power is

evacuated through the six lines at Bus I & Bus II. Capacity of link is 2000 MW.

Two breakers are available, each can take 1000 MW safely.

viii. SRLDC stated that N-1 is normally available when flow is towards SR. Suppose

Talcher Stage II generation is around 2000 MW and poles trips or go to GRM

then the flow on the link is the difference between the generation at Talcher and

the flow through GRM(150 MW). If at that time Orissa loads are high there will

be a heavy overloading on Talcher- Meramudali lines since the lines are of

different length. On a query by MS SRPC, SRLDC confirmed that there are two

set of links, one link is 4 lines from Talcher Stage II to HVDC Talcher and the

other link is the interconnector to Talcher Stage I.

ix. Shri D G Rao, CGM Kaniha, informed that regarding Maramundali line loading

beyond 800 MW, SPS can be formulated to back down from Talcher –

Meramundali line instead of backing down from HVDC. He requested SRLDC

to give this feedback to NLDC.

B. Conclusion

i. SRLDC informed that discussions had been carried out between

NLDC/ERLDC and SRLDC in this regard and a tentative scheme had been

formulated. After finalization (expected within two weeks), the proposed

scheme would be put up to WRPC/SRPC OCC.

ii. SRPC suggested that before finalizing the tentative scheme NLDC may call a

joint meeting of all the stake holders.

3.3 Operational Constraints observed at Bhadrawati Back to Back

HVDC link

a) Bhadrawati Back to Back HVDC link is an important link between Western

Region and Southern Region whose power order is used as a control to ensure

reliability of the system. The control provided by HVDC link is helpful not only

to manage contingencies but also to facilitate the charging of new elements in

the grid.


b) NLDC vide letter dated 22.09.2020 (Annexure-3.3.A) had informed that

recently, during request to change the power order of HVDC Bhadrawati,

following constraints were expressed by the operator at HVDCBhadrawati:

i. On 14th August 2020, in order to accommodate testing of HVDC Raigarh-

Pugalur pole-1 at 1500 MW, code was given to reduce the power order of

Bhadrawati B/B HVDC from 300 MW (West to South) to 200 MW (South to

West). But during this power ramp down, south side system voltage increased

to 431 kV. Bhadrawati operator informed that tap of position of south side

converter transformer has moved to tap position number one (bottom most)

and Pole control of HVDC gave alarm of “Valve winding voltage limit

exceeded”. Therefore, power flow of HVDC Bhadrawati could be reduced only

to 250 MW (West to South). The net change is only 50 MW instead of

requirement of 500 MW.

ii. The Bhadrawati station operator at times is also reporting issues of thermal

overloading of HVDC filters while reducing power order or operating HVDC

at lower power order.

iii. The site is also reporting that at lower power order harmonic issues are being

observed in HVDCs and lower power orders beyond a certain level are

difficult.

c) Since flexibility provided by HVDC links are important for system reliability, it

is requested to look into these issues, identifying root cause and taking suitable

measures to resolve the issues such as (but not limited to)

i. Feasibility of changing the tap setting such that power order change is

permitted say beyond 431 kV.

ii. Resolving the harmonics issue through suitable measures of HVDC controls

and/or filter operation.

iii. Probably, above may also resolving filter over load issue.

A. Deliberations

i. SRLDC explained the issues and stated that there are mainly three

constraints as follows:

a. Whenever the bus voltage is 431 kV, the tap position is at bottom most

Tap and further optimization of converter transformer tap changing is

not possible and power order is not changed.


b. At lower power orders harmonic issues are more.

c. Filters are getting overloaded.

ii. SR I informed that control of Bhadravathi is with WR and WR can only

address/give feedback on this issue.

B. Conclusion

The issue would be discussed in the next OCC meeting involving WR .

3.4 Frequent / Daily Hand tripping of 765 kV & 400 kV Lines –

Stress on EHV equipment due to frequent switching

a) SR I PGCIL vide letter dated 23.09.2020 (Annexure-3.4.A) had expressed

concern regarding the frequent switching (hand tripping) of 765 kV & 400 kV

elements due to over voltage in the system.

b) The following were mentioned:

i. The issue was discussed in 33rd

, 34th, 35

th, 36

th and 37

th SRPC meetings held

on 17.2.2018, 11.8.2018, 17.2.2019, 12.7.2019 & 1.2.2020 respectively and

SRLDC have assured to take up the issue proactively and shall take out one

of the double circuit lines on sustained basis ie 07 days to avoid frequent

switching.

ii. NLDC is issuing the codes on daily basis for taking the 765 kV Nizamabad –

Maheshwaram and 765 kV Kadapa – Thiruvalam Lines out of service in

evening and taking it back into service next morning. The total no. of

switching operations and Over Voltage trippings from Jun’20 to Aug’20 is as

below:

Sl.

No.

Name of Line No. of

outages

No. of CB

operations

No. of CB

operations

per day

1 765 kV Nizamabad – Maheshwaram D/C line

44 1232 14

2 765 kV Kadapa – Thiruvalam D/C Lines

40 960 11


3 765 kV Kadapa – Kurnool D/C Lines

13 312 04

iii. Due to High voltage in the system and also due to frequent tripping/switching

of 765 kV and 400 kV Lines, EHV equipment are losing its useful life due to

the stress during the switching surges.

iv. GIS equipment at these stations are imported and in the prevailing pandemic

situation and current state of affairs at diplomatic level, any unforeseen failure

of such nature may lead to prolonged outage due to unavailability of support

from the OEMs for supply of spares / providing services.

v. PGCIL requested to examine the possibility of reducing the number of

switching operations by bringing in grid discipline and control over voltages

instead of frequent switching of 765 kV / 400 kV Lines. In case isolation of

grid lines is unavoidable, then possibility of keeping one element of D/C lines

isolation on sustained basis for alternate weeks may also be kindly examined

as already minuted in the 37th

SRPC meeting.

c) This issue had been deliberated in the 170th

OCC Meeting and the following

were noted:

i. A Special Meeting would be convened to discuss the high voltage

issues/reactive power management. Node - wise analysis where reactive

injection is there would be carried out in the Special Meeting.

ii. Taking out of 765 kV Nizamabad -Maheshwaram would be considered by

SRLDC/NLDC as there was a parallel 400 kV quad Nizamabad –

Shankarapalli-Maheshwaram route.

iii. Switching operations at GI stations would be optimized by SRLDC/NLDC.

iv. Identified Reactors needed to be expedited without linking it with PSDF

funding.

v. Support of generators (including RE) needed to be ensured.

vi. Intra state reactive accounting to be considered by the States.

vii. STATCOM around Bengaluru may be proposed by KPTCL to SRPC TP.

SRLDC stated they would support the cause. KPTCL stated that they would

take up with SRPC TP and the STATCOM could be funded through PSDF.

viii. SRLDC agreed that violation messages for reactive injection at high voltage

nodes would be issued.

A. Deliberations


i. SRLDC informed that concern of PGCIL had already taken up with

NLDC. NLDC have agreed for optimization of the opening of

Chilakkaluripeta- Kadappa lines. But if 765 kV Nizamabad –

Maheshwaram line is kept open for a sustained period TTC/ATC

reduction of 800 MW is envisaged from New grid to SR (Inter Regional).

If constituents agree, line can be open for sustained period.

ii. SE(O), SRPC opined that TTC/ATC declaration/computation which

needed to be carried out according to Regulations and cannot link with

operational issues.

iii. MS SRPC stated that the healthy/safety of the equipment needed to be

given first priority. Failure of costly equipment should be avoided. He

desired to know regarding the utilization of inter-regional corridor at

present. SRLDC informed that around 9000 MW capacity is utilized out

of 12000 MW capacity available. He requested SR I to apprise on the

number of switching operations permissible at GIS S/Ss and how many

operations had occurred till date. He opined that the life of the equipment

also can be assessed on this basis. SR I stated that there are two categories

of switching operations, one at rated voltage and another at fault/tripping

at over voltage. SR I informed that they will revert back on the same

shortly.

iv. TSTRANSCO, KPTCL, APTRANSCO (confirmed via mail

subsequently) & TANTRANSCO endorsed SRPC’s view. KSEBL stated

that opening of lines continuously for 7 days needed to be carried out after

assessing anticipated grid conditions.

v. SR I informed that reactor is available at Kurnool end but not at

Maheswaram end on Kurnool-Maheswaram line.

vi. ED SRLDC opined that ATC reduction in case of taking out a line is not

as per Regulation. Line can be taken out and as and when system

warrantees line can be brought to service. ATC/TTC issue may be

discussed in Commercial Committee Meetings. Only operational issues

will be discussed in the Meeting.

B. Conclusion

i) SRLDC informed that NLDC had agreed for optimizing Switching

operations at GI sub stations.


ii) W.r.t 765 kV Nizamabad – Maheshwaram lines, it was suggested that one

line may be kept open for 7 days alternatively and as per real time system

requirement line may be brought back. NLDC may be appraised of the

operational issues.

iii) Installation of identified Reactors needed to be expedited without linking

it with PSDF funding.

iv) Support of generators (including RE) needed to be ensured.

vii. Intra state reactive accounting to be considered by the States.

viii. SR I may intimate the number of switching operations permissible at GIS

S/Ss and how many operations had occurred till date.

3.5 High voltage at Ramagundam RSTPS

a) NTPC, Ramagundam (RSTPS) vide E-mail dated 24.09.2020 (Annexure-

3.5.A) had intimated regarding the higher 400 KV voltages since last one week

especially during night (21:00-03:00 Hrs). After tripping of Nagarjuna Sagar

Line-1 & 2 & with Maximum absorption of MVAR NTPC is not able to contain

the voltage in normal range. RSTPS units are operating at "Under Excitation

Limiter" conditions during above said period of high 400 KV line voltage.In

view of stability of on bar units, NTPC is forced to operate the units at reduced

load vis-à-vis SG and thus causing high DSM losses during such period. 4

incidents in one week had been observed. It was requested take necessary action

to control 400 KV voltage, reduce commercial loss to NTPC on this ground of

no fault from RSTPS side.

b) NTPC, Ramagundam (RSTPS) vide E-mail dated 01.10. 2020 (Annexure-

3.5.B) had further submitted that NTPC is forced to operate the units at reduced

load vis-à-vis SG given and thus causing DSM losses on 20.09.2020,

22.09.2020 & 28.09.2020 (about Rs 12.85 Lakhs). Further, NTPC

Ramagundam is also forced to reduce the DC from 820 MW to 790 MW (14

Blocks) due to MVAR restriction on 28.09.2020 and requested that necessary

action may be taken to control the voltage which will improve the grid stability

as well as reduce the commercial loss to NTPC Ramagundam.

A. Deliberations

i. NTPC, Ramagundam (RSTPS) expressed concern regarding the higher 400

KV voltages forcing NTPC to operate the units at reduced load causing

turbine vibration issues.


ii. SRLDC stated that over voltages at Ramagundam is observed when

Telangana consumption is low/sudden dip in consumption in spite of

opening of around 60 lines including Nagarjunasagar lines. Ramagundam

500 MW units are performing well by absorbing around 150 MVAR each,

as per capability curve. SRLDC presented on the scenario of voltage

situation on the days highlighted by NTPC. Telangana consumption was

very high those days, around 220 MUs and it dropped to 180/140 MU. This

is the real cause for high voltage at Ramagundam(around 420 kV). SRLDC

had presented the number of lines opened during September 2020. From the

MVAR analysis it was observed that units are absorbing around 150

MVAR(500 MW units).

iii. MS SRPC observed that on 4.10.2020 (Sunday) evening around 7’O clock

all the lines were injecting MVAR to Ramagundam bus like Bhadravathi,

Hyderabad and Ditchipally lines. To MS query, NTPC clarified that only

one reactor(63 MVAR) at N’sagar end is available and there is no feasibility

to install further reactors because of constrains in space availability.

iv. SRLDC suggested that converting the line reactor at Ramagundam(63.5

MVAR – ownership-NTPC) on Ramagundam-Nagarjuna Sagar line to

switchable reactor. SR I informed that the physical connection of reactor,

whether it is after isolator or before isolator.

B. Conclusion

i. It is observed that more reactive power is flowing from Bhadravathi to

Ramagundam which may be contributing to over voltage at Ramagundam

and this issue may be taken up with WR for correct filter settings etc..

ii. NTPC suggested that when Ramgundam generation is less i.e. around 1500

MW, Ramagundam Ditcipally / Ramagundam-Warangal lines could also be

taken out which are lightly loaded. SRLDC agreed for the same.

iii. NTPC/SRLDC were suggested to give feedback to planner in this regard.

The possibility of converting line reactor at Ramagundam on Ramagundam-

N’Sagar to switchable reactor may also be explored.

iv. NTPC was suggested to bring to the notice of OCC forum if such over

voltages are again perceived.

3.6 Minimum Load for Unit-3 of Simhadri

A. NTPC Simhadri vide letter dated 18.09.2020 (Annexure-3.6.A) had informed

that Unit-III TG shaft vibrations were maintaining high at Bearing -1 since

January 2020. For rectifying the same, unit was taken under shut down (AOH)


from 05.08.2020 to 26.08.2020 and the rectification works were carried out.

The maximum shaft vibrations were observed to be coming down but it is being

detected that at technical minimum loads (275 MW) shaft vibrations are

touching the alarm values (200 microns) and are varying with grid frequency &

ambient conditions. With this running the Unit safely at technical minimum

load is becoming difficult. Hence it is requested that technical minimum load

for Unit-III may be revised to 325 MW and revise Stage-II technical minimum

load to around 568 MW (Ex-bus) till the problem is addressed.

A. Deliberations

i. NTPC Simhadri requested to revise technical minimum of Unit I of Stage II

to 325 MW and revise Stage-II load to around 568 MW (Ex-bus) till the TG

shaft vibration problem is addressed during the Annual O/H planned in

September/October 2021.

ii. APTRANSCO suggested that NTPC may go for another trial of rectification

works during Nov/Dec 2020 (as already taken out from 05.08.2020 to

26.08.2020). Since APTRANSCO is expecting reduction in demand in

coming few days, it is appreciable from NTPC side to attempt one more time

to rectify the issues taking short shut down in November/December 2020.

NTPC’s request to allow Technical Minimum of 325 MW involves

commercial issues and the views can be given only after discussing with

higher ups.

iii. TSTRANSCO suggested that NTPC may do the rectification works during

Simhadri - Kalapkka line shut down which is planned in Nov/Dec 2020.

Short shutdown may be taken to rectify the issue and unit can be brought

back with normal technical minimum. If not possible, it was recommended

that the shutdown may be planned during April to June 2021 or

November/December 2021.

iv. NTPC expressed that they have already taken shut down from 05.08.2020 to

26.08.2020 and the issues were not rectified. Spares are to be received which

will take time, planning is required. OEM (BHEL) support is very much

necessary.

v. KPTCL informed that KPTCL cannot accept the proposal since during low

load conditions KPTCL cannot accommodate higher technical minimum

(Unit – III technical minimum of 325 MW instead 275 MW) share of

KPTCL.


vi. TANTRANSCO suggested that NTPC may carry out the rectification works

taking short shut down and annual over haul may be planned in low load

period.

vii. KSEBL intimated their disagreement for NTPC’s proposal.

viii. SRPC observed that Simhadri units are taken out once in two years for

maintenance works and in view of the vibration issues persisting in Simhadri

units there is a need for reviewing of maintenance schedule periodicity and

a detailed study may be carried out to address the issues in fruitful way.

ix. NTPC informed that except at Talcher (Units are getting full schedule almost

all the time), turbine issues are being faced at all other units of NTPC stations

in SR where frequent change in schedules are received.

x. MS SRPC desired to know whether this type of issues are being faced at all

NTPC Stations (all India level).

xi. NTPC informed that issues are observed in units which are prone to schedule

variation. NTPC is analyzing the issues.

xii. SRLDC opined that an exhaustive study may be carried out by NTPC at All

India level, scrutinizing performance of all NTPC stations to reach at real

cause of turbine issues and to decide on correlating the issues with schedule

variations.

xiii. SRLDC/SRPC stated that Unit Technical Minimum may be kept in

compliance to IEGC provisions. NTPC may furnish their feedback/issues

for TCC deliberations.

B. Conclusion

i. SRPC observed that Simhadri units are taken out once in two years for

maintenance works and in view of the vibration issues persisting in Simhadri

units there is a need for reviewing of maintenance schedule periodicity and

a detailed study may be carried out to address the issues in fruitful way.

ii. NTPC informed that except at Talcher (Units are getting full schedule almost

all the time), turbine issues are being faced at all other units of NTPC stations

in SR where frequent change in schedules are received.

iii. SRLDC opined that an exhaustive study may be carried out by NTPC at All

India level, scrutinizing performance of all NTPC stations to reach at real

cause of turbine issues and to decide on correlating the issues with schedule

variations.


iv. SRLDC/SRPC stated that Unit Technical Minimum may be kept in

compliance to IEGC provisions. NTPC may furnish their feedback/issues

for TCC deliberations.

3.7Schedule for APC (Advanced Process Control) tuning at

SimhadriU-4 / Tuning at NTECL units

a) NTPC, Simhadri vide email dated 07.09.2020 had furnished schedule for APC

(Advanced Process Control) tuning at Simhadri unit-4. In the 170th OCC

Meeting, it was requested to all the constituents to give the required schedule to

enable NTPC to conduct the test. It was also suggested that in coordination with

all NTPC stations dates may be rearranged to avoid coincidence of outages.

b) Further NTPC vide letter dated 28.09.2020(Annexure 3.7.A) had requested for

schedules for Simhadri Stage II units for conducting APC tests and permit to

bring back Unit-IV from RSD.

Deliberations

i. NTECL Vallur informed that in the 170

th OCC meeting approval was given for

tuning from 15.10.2020(3 weeks). Tuning will be carried out at Unit I from

15.10.2020 since Unit is going for Annual Outage from 24th

November 2020. He

expressed that schedules are getting during evening hours and there won’t be any

issue regarding the required schedule for testing and requested SRLDC to suspend

SCED and RRAS during that period. He stated that whenever SCED is coming

into picture suddenly schedules are coming down.

ii. SRLDC clarified that during the testing period care would be taken to suspend

RRAS and SCED in coordination with NLDC.

iii. SRLDC requested NTECL to give prior intimation regarding the testing schedule

and SRLDC would request NLDC to disable SCED and RRAS w.r.t NTECL

during this period.

iv. SE(O) suggested that if NTECL & NTPC Simhadri are getting schedules

simultaneously they both can move ahead with testing. If not getting schedules,

one testing can be carried out at a time, in such situation NTECL is given priority.

v. DE, TSTRANSCO suggested that testing may be carried out in morning hours.

KPTCL also suggested the same.

vi. SE(O), SRPC suggested that if NTECL &Simhadri are not getting schedules

simultaneously, NTPC Simhadri can carry out the testing during 06:00 hours to

10:00 hours since TS is having more share from Simhadri. NTECL can carry out


the testing during 16:00 hours to 21:00 hours since TN is having more share from

NTECL.

B Conclusion

i. If NTECL & NTPC Simhadri are getting schedules simultaneously they can move

ahead with testing. If not getting schedules, one testing can be carried out at a

time, in such situation NTECL is given priority.

ii. As suggested by TSTRANSCO, NTPC Simhadri may carry out the testing during

06:00 hours to 10:00 hours since TS is having more share and NTECL may

schedule the testing during 16:00 hours 21:00 hours when TANTRANSCO (more

share) have more load.

iii. SRLDC requested NTECL to give prior intimation regarding the testing schedule

and SRLDC would request NLDC to disable SCED and RRAS w.r.t NTECL

during that period.

3.8Issues by changing technical minimum 257.8 MW to zero for

NTECL

a) NTECL vide E-mail dated 25.09.2020 (Annexure-3.8.A) had informed that it

was observed that SRLDC has withdrawn NTECL Vallur technical minimum

at 22:39:35 hrs in DC web page after initially maintaining technical minimum at

257.8 which led to reversal of schedules for block no's -53 to 66 ,74 to 88. In

revision 196,198 the SG of previous block also got changed. It was requested

that the withdrawal of assuring technical minimum schedule by SRLDC may

please be exercised for future blocks of the day.

B Deliberations/Conclusion

i. SRLDC informed that it was made inadvertently and will not be repeated.

ii. NTECL informed that even though beneficiaries are giving Technical

minimum if RRAS is coming to picture, schedule is going below technical

minimum.

iii. SRLDC informed that in new program of RRAS and SCED, technical

minimum schedules are being taken care, and schedules will not go below

technical minimum.

iv. NTECL may bring to SRLDC notice in real time if such issues arises

which will be intimated to NLDC and the generator whichever is running

with support of only one or two states will be excluded from RRAS

support.


3.9 Inclusion of 400 kV KKNPP-Tuticorin pooling station

transmission lines under loading issue

a) KKNPP vide their letter dated 18.09.2020(Annexure-3.9.A) had informed that

400 kV KKNPP-Tuticorin pooling station transmission lines – 1&2 (ACL13

&ACL 21) are very much under loaded as compared to 400 kV KKNPP-

Tirunelveli transmission lines (ACL 22 & ACL 23). This is resulting in increased

loading of 400 kV KKNPP-Tirunelveli transmission lines and leading to

deterioration of some switchyard components corresponding to these lines, like

joints and connectors. Also, it is observed that in case any of the 400 kV

KKNPP-Tirunelveli transmission line is taken out of service, the other one is

getting heavily loaded. This situation can lead to unwarranted line outages and

is detrimental to grid security.

b) An instance of switchyard connector failure in ACL23 400 kV KKNPP-

Tirunelveli line-1 occurred on 21.03.2020. The power flows through various

grid elements at KKNPP end at different stages of line outage and repair work

on that day also had been furnished by KKNPP.

c) It is requested that the issue may please be included in the upcoming OCC

meeting agenda and reviewed in detail for necessary solution.

A Deliberations

i. SE(O), SRPC intimated that this issue was discussed in 2nd

SRPC TP Meeting

and minutes are awaited. Some modification has been suggested such that three

lines would be available to Thirunelveli and one line to Tuticorin. He recalled

that two lines were shifted to Tuticorin on written request from KKNPP

pointing out reliability, and one line was extended to Madurai also for some

period of time.

ii. SRLDC informed that one of the line from KKNPP to Tuticorin PS will be

LILOed at Thirunelveli and three lines would be available to Thirunelveli and

one line to Tuticorin.

iii. SR II informed that power flow is more on KKNPP - Thirunelveli line since

the line length is less compared to KKNPP – Tuticorin line. The power flow is

reaching sometimes around 1460 MW also. Continuous high power flow is

affecting equipments and hot spots are observed.

iv. SRLDC informed that there is high loading of KKNPP to Thrunelveli line II

which is going to 1300 MW. Even during outage of this line, at 400 kV there


won’t be evacuation problem since lines are QUAD (capability 1700 MW).

But 220 kV side where KKNPP Tuticorin Auto and Sriperumbudur-

Kudankulam lines will trip immediately and 220 kV KKNPP side may go dead.

SRLDC had been requested to TANTRANSCO to address this issue by

radializing the loads accordingly.

v. TANTRANSCO stated that LILOing of KKNPP- TTPS pooling station at

Thirunelveli or restoring the Thirunelveli line only will help in over loading at

220 kV side.

vi. The forum suggested that SR II may seek separate approval from Standing

Committee and shifting of line can be done quickly and the problems will be

solved. Since bays and lines are available only some jumpering works are

required to be carried out.

vii. SRLDC informed that every line should be capable of carrying its thermal

limits on a constant basis to take care of N-1.

viii. KKNPP is requested to expedite the revival of KKNPP – Thirunelveli line – I

which is out from 21.07.2020.

ix. MS SRPC opined that evacuation from Nuclear Stations should be viewed

seriously. Four more Units are in pipeline at Kudankulam. He requested

PGCIL to take care of all such issues also while designing the lines. It is also

wind prone area.

x. On a query to MS SRPC that whether there is possibility of installing FSC to

address this issue, SRLDC informed that installing FSC cannot help in

addressing this issue. SR II stated that at direct evacuation system usually FSCs

are not installed.

xi. The suggestion of opening of two ICTs simultaneously by TANTRANSCO,

KKNPP informed that it is not possible according to the Norms(two power

supply at different voltage levels).

B. Conclusion

a) KKNPP is requested to expedite the revival of KKNPP – Thirunelveli line – I

which is out from 21.07.2020.

b) The forum suggested that SR II may seek separate approval from Standing

Committee and shifting of line can be done quickly and the problems will be

solved.


c) TANTRANSCO is requested to consider SRLDC suggestion of radialization

of loads to avoid overloading of 230 kV lines from KKNPP.

d) SRLDC informed that every line should be capable of carrying its thermal

limits on a constant basis to take care of N-1. Maintenance should be carried

out accordingly like attending the hot spots, jumpering etc.

3.10 RE potential and RE projects being implemented under

intra-state system in Southern Region

a) In the 1st SRPC-TP meeting held on 16.12.2019 it was noted that SRPC

secretariat would monitor the following:

i. RE projects being implemented under intra-state system in SR states.

ii. RE potential already developed in SR States.

iii. RE potential which could be developed at different location (connected to

ISTS/state grid) based on availability of land and other infra-structure in SR

states.

b) SRPC vide letters dated 10.03.2020, 19.05.2020 and 17.09.2020(Annexure-

3.10.A) had requested all the states to furnish the information. It is noted with

concern that only TSTRANSCO & KSEBL had furnished the details.

c) Second SRPC TP Meeting is scheduled on 01.10.2020.

Conclusion

All the states requested to furnish the information.

3.11 Implementation of Intra-State Reactive Power Accounting

a) Possibility of implementation of intra-state reactive power accounting in line

with ISTS may be discussed. Whether it could be extended to intra state

generators may be discussed.

A. Deliberations

i. SRPC stated that intra-state reactive power accounting in line with ISTS may

be implemented to take care of high voltages prevailing at present. State

GRIDCODE should be in line with IEGC as per Electricity ACT.

KPTCL: A note have been put up to higher management. Discussed

in KEGC review meeting also.


TANTRANSCO: Will be covered in SAMAST software. Note has

been submitted to TNERC, and TNREC has to notify the procedure.

KSEBL: Will be covered in SAMAST software.

AP: Will apprise with Management and revert back.

TS: TSERC need to notify the procedure.

SRLDC: State GRIDCODE should be in line with IEGC. Since

Regulations are not there at present, states are requested to approach

State Regulators.

3.12 Issue in downloading SG (Scheduled Generation) from

SRLDC website

a) NTECL vide E-mail dated 01.10.2020 & 05.10.2020 (Annexure-3.12.A) had

informed that auto updation in NTECL control room display getting

intermittently stopped due to master.csv file not updating in SRLDC server for

every revision . This is causing them to monitor every block SG by refreshing

web page.

b) In the Meeting CGM, SRLDC informed that they will look into the issue and

revert back.

3.13Persistent over drawal by SR Constituents on 19.09.2020

and 24.09.2020 which caused frequency to go below IEGC

band for considerable duration

a) SRLDC in their agenda submitted for 171st OCC Meeting, had noted the

with concern w.r.t the persistent over drawls by AP, TS, KAR & TN

(i) On 19-09-2020

- AP over drawl of 1013 MW at 49.66 Hz

- TS over drawl of 411 MW at 49.66 Hz

(ii) On 24-09-2020 at 49.64Hz over drawl of SR states as follows

- AP (243 MW), Karnataka (525 MW), TN (217MW) (iii) Southern states deviation for 19

th & 24

th September 2020 is attached

at Annexure-3.13.A

(iv) All constituents are requested to maintain their drawl close to

schedule in order to have secured grid operation.

(v) All states are requested to provide ADMS operation details along

with SOE and quantum of load relief provided by ADMS.


b) SRLDC vide letters dated 05.10.2020 (Annexure-3.13.B) had furnished

deviation in drawal by AP, TS, KAR & TN during 31st August 2020 to 27th

September 2020.

c) Subsequently SRLDC vide letter dated 08.20.2020 had taken up the issues

with States.

Deliberations

a) SRLDC expressed concern regarding the persistent over drawal by SR

constituents on 19.09.2020, 24.09.2020, 05.10.2020, 06.10.2020 &

08.10.2020 which caused frequency to go below IEGC band for

considerable duration in the evening peak. SRLDC was forced to do first

level of physical regulation by opening Munirabad ICT(KPTCL) on

08.10.2020 in the evening at low frequency. KPTCL approached SRLDC

and stated that this action will trip feeder which is incidentally feeding

Oxygen Plant and because of Covid, tripping of this feeder is not advisable.

SRLDC desired to know from KPTCL that how tripping of 400 kV ICT

caused tripping of 220kV or 110 kV line.

b) KPTCL informed that on 24th September variation in Wind generation

caused for over drawl. On 5th October 2020 solar variation attributed for over

drawl. On 4th solar generation was 1600 MW whereas on 5

th only 300 MW

solar was available. UPCL, YTPS and BTPS were not able to come on bar

citing technical issues. Generators are declaring DC and when schedules are

given not able to come up. Management has not given permission to RTM

provisions for purchase of power.

c) KPCL expressed concern regarding frequent change of MOD and RSD

messages affecting operation of KPCL Thermal Units. Even the situation

like all the RTPS units are also happening. He opined that at least one unit

availability of Thermal unit can address the issues.

d) APTRANSCO informed that on all occasions the major cause was variation

of actual wind generation w.r.t forecast provided QCAs. Variations in actual

compared to forecast varied from 600-1600 MW. Utilization of RTM was

also restricted by high prize/less quantum/zero quantum available.

e) TSTRANSCO informed that the overdrawals were caused mainly due to

unexpected climate changes and variation in demand w.r.t forecast. CGS

power recall also was restricted because of implementation of 7-8 time


blocks for schedule revision. He requested SRPC to address this issue to

CERC. The flexibility available with SLDCs are jeopardized. Had a meeting

with shift officials to address this issue.

f) TANTRANSCO informed that the overdrawals were caused mainly due to

sudden pick up of load and variation in demand w.r.t forecast. On 5thOctober

2020 there was a sudden demand pick up and simultaneous reduction of

wind generation which caused 1700 MW over drawl. Forecaster gave a

forecast of 3700 MW in the peak hour and actual wind generation realized

was 2800 MW. Immediately all the units at NTECL Vallur was brought back

from RSD.

g) All the states expressed regarding the difficulties faced by them in managing

LGB after implementation of 7-8 time blocks for schedule revision.

h) MS SRPC expressed concern regarding the huge overdrawal causing threat

to Grid Security despite of all commercial mechanism like DSM, sign

change violation etc in place. On a query of MS SRPC it was stated by

SRLDC that wind pattern in AP & Karnataka will be similar where as in

Tamil Nadu it will be different. MS SRPC requested all SLDCs to cooperate

with SRLDC for better grid operation. Also he emphasized the need of

improved RE& Demand forecasting for healthy grid operation. Generators

were also suggested to cooperate with SLDCs by sticking to their schedules

and bring back the units/increase or backing down of generation as per

instruction of SLDCs. The maintenance of generating units should be given

priority and needed to be carried out in time to keep the Units healthy such

that the units may be taken on bar whenever warranted.

i) SE(O), SRPC suggested that POSOCO may be approached to explore the

possibility of scheduling centrally scheduled RRAS/SCED to the defaulting

state specifically. In special circumstances where states are overdrawing

more than 500/600 MW this can be thought off. It needs some regulatory

modifications. Scheduling to the pool will not correct DSM whereas

scheduling to specific beneficiary will correct DSM. RRAS can correct the

frequency, deviation can be corrected only by schedule change.

j) SRLDC agreed to address this suggestion to NLDC.


k) SRLDC expressed concern regarding the non-availability of spinning

reserve, insufficient ADMS, high demand and RE forecast errors. SLDCs

are leaning on ISTS drawl for managing their LGB.

B Conclusion

l) All constituents are requested to maintain their drawl close to schedule in

order to have secured grid operation.

m) All states are requested to provide ADMS operation details along with SOE

and quantum of load relief provided by ADMS.

n) All generators are requested to cooperate with SLDCs by coming on bar

whenever schedules are given. All units should be maintained such that at

the needed time units can be synchronized immediately.

o) KPTCL is requested to seek permission from Higher Management to go for

RTM so that system operators will get flexibility.

p) SRLDC stated that in order to maintain the grid parameters within IEGC

band, it is imperative for each control area to restrict the drawl within

schedules at all times by ensuring appropriate proactive/real time measures

such as accurate weather/demand forecasting, RE forecasting/scheduling,

portfolio management, maintaining adequate spinning reserves in the

system, co-ordination for maintenance of evacuation lines from generating

stations, procurement of power through RTM, staggering of loads, ensuring

sustained availability of ADMS etc.

q) Forum suggested that the situation may be watched for coming few days and

if overdrawals are still not controlled to the limit, a separate Meeting would

be convened to address the issues.

r) SRLDC will take action as per Operating Procedure in place to control the

over drawals / under drawls.

s) SRPC suggested that POSOCO may be approached to explore the possibility

of scheduling centrally scheduled RRAS/SCED to the defaulting state

specifically. It needs some regulatory modifications. Scheduling to the pool

will not correct DSM whereas scheduling to specific beneficiary will correct

DSM.

t) SRLDC agreed to give the feedback to POSOCO in this regard.


I. Subsequently UPCL vide E-mail dated 10.10.2020(Annexure-3 13.C)

have submitted the chronological details for the availability declaration

4. Follow up issues

4.1 Scheduling modalities during primary frequency response

testing of generators as per IEGC 5.2.g

a) As decided in the 170th

OCC Meeting, a meeting was held between SRPC &

SRLDC to on 14.09.2020 to discuss on the scheduling/accounting issues.

b) The following procedure is recommended during primary frequency response

testing:

1. ISGS Generators: The primary frequency response testing is the

mandatory requirement as per as per Indian Electricity Grid Code

Clause 5.2(g). Hence, generating station has to ensure the schedule

required for testing at different power levels in coordination with

beneficiaries.

2. IPPs and Merchant Generators: The primary frequency response

testing is the mandatory requirement as per as per Indian Electricity

Grid Code Clause 5.2(g). Hence, generating station has to ensure the

schedule required for testing at different power levels through states

LTA requisition, Day-ahead market and Real Time Market.

3. For generators which do not get full schedules or units are taken under

RSD, it was felt that the testing should be undertaken in peak months

i.e December-May period

4. The primary response testing is same as other testing like PG test etc,

which will not require extra compensation or deviation suspension.

Account would prepare as per the existing regulatory provisions.

5. There is requirement of part load operation at 80% and 65% loading.

The blocks of testing (80%/65%) will not be considered for part load

compensation both for generator and beneficiaries. The information

will be communicated by SRLDC to SRPC in mutually agreed format.

6. The testing schedule should be intimated to beneficiaries at least 7 day

ahead of the testing day by the testing agency/generating plant.

7. In every month OCC meeting, the testing schedule can be discussed for

generators which are going to be tested in the subsequent month and


concurrence may be taken from all constituents. The request would be

put forth to the OCC by concerned generator. Once the concurrence is

taken:

ISGS Generators: Schedule as agreed in Test would be ensured by

SRLDC for the applicable blocks.

IPPs and Merchant Generators: Schedule would be ensured by

respective generator.

8. The testing agency has to ensure all measures to avoid unit tripping

during testing. In case of Unit tripping during testing, which is

attributable to the testing will be dealt suitably after discussion in

appropriate forums on case to case basis.

The following were noted in the Meeting:

a) As decided in the 170th OCC Meeting, a meeting was held between SRPC

& SRLDC to on 14.09.2020 to discuss on the scheduling/accounting issues

and a procedure is recommended during primary frequency response testing

which needs OCC approval for implementation.

b) There was no comments from any entities and the forum approved the

procedure for implementation.

4.2 Declaration of High and Low demand seasons of Southern

Region for 2021-22

a) In the 170th

OCC meeting it was requested that observations/queries, if any on

procedure may be communicated to SRLDC within one week as SRLDC need to

declare the High/Low Demand Season by end of September 2020.

b) Accordingly SRLDC had declared High Demand season period of three months

in a year as April 2021, February 2022& March 2022and Low Demand season

(period of 9 months in a year) as May 2021 to January 2022.

In the Meeting OCC forum noted the same.

4.3 Providing SCADA data on Dual Channel & Voice

communication on VoIP(Voice over Internet Protocol )

a) SRLDC vide letter dated 28.08.2020had highlighted the importance of

availability of dual redundant data channels from field (wind/solar plants) to

SRLDC REMC.


b) SRLDC had informed that SRLDC had taken up with APSPCL& KSPDCL

regarding the need for dual redundant data channels from field to SRLDC

REMC. The Nodal Officers identified for communication regarding the issues

were also requested.

c) APSPCL had informed that they have furnished the information on 11.09.2020.

SRLDC informed that they will check the information and anything further

required would be sought accordingly.

d) KSPDCL had informed that the work of Supply and Commissioning of

Telemetry and Metering Gateway in 8 nos of 220 kV substation in Pavagada

Solar Park is awarded to M/s GET&D India Ltd vide letter dt.04.01.2020. The

drawings related to Telemetry and Metering Gateway in 8 nos of 220 kV

substations is approved by SEE, SCADA, KPTCL vide letters dt.07.4.2020 and

04.07.2020. The firm has requested to arrange for online inspection and it is

proposed to have online inspection along with assistance from SEE, SCADA,

KPTCL 14/16.09.2020. The SPDs have confirmed integration of their

equipment upto Inverter level with the SCADA installed inside their poling

substation.

The following were noted in the meeting :

i. SRLDC informed that VoIP is provided by two wind stations one at Tuticorin

and Betham. APSPCL had informed the Nodal officers details, others yet to

submit.

ii. KSPDCL had informed that all Telemetry had reached the site. All the material

supplied. Works will be started by next week and would be completed by next

month.

iii. APSPCL informed that upcoming developers have new IP phones and other

developers also requested to have the VoIP/dual channel availability. SPDs also

have been informed and they are ready to get new IP phones.

4.4 Communication related issues

a) As per Communication Regulations, 2017, from each RTU locations, dual path

communication availability is to be provided to RLDC and back up RLDC

exclusively. After deliberations in the 170th OCC meeting it was suggested that

a team of members from SRLDC, SR I, SR II, SRPC & concerned States may

check the dual communication path availability to Main & Back up SRLDC. As

far as possible physical redundancy may also be examined.


b) Accordingly SRPC vide letter dated 18.09.2020 (Annexure-4.4.A) had

requested SRLDC to kindly nominate their team leader and member and initiate

to seek nominations from other members to constitute Audit Team. SRPC has

nominated Mr A Kesavan, EE, & Mr. Bharat Kumar, AE as members of the

Audit Committee.


i. SRPC, SRLDC, SR I, KPTCL & TSTRANSCO had furnished the nominations

for Audit team. APTRANSCO informed that nominations are furnished to

Management for approval.

ii. TANTRANSCO informed that they have informed communication wing and

will furnish the details shortly.

iii. SR II informed that they have requested ULDC team to nominate the officials.

iv. APTRANSCO informed that names are identified and will furnish within

couple of days.

v. APTRANSCO, KSEBL, TANTRANSCO & SR II are requested to furnish the

details.

4.5 RSD issues

a) A Meeting in this regard was convened on 19.08.2020 and 03.09.2020 through

WebEx VC. It was agreed that the RSD proposal (except Para IV and Para V (f)

to (l)) would be implemented in SR. Para IV and Para V (f) to (l) would be

implemented on Trial Basis for two months. Beneficiaries (including PGCIL,

Goa and Odisha) are requested to give concurrence for trial of two months.

b) It is noted that TSSLDC vide letter dated 24.09.2020(Annexure-4.5.A), KSEBL

vide letter dated 25.09.2020 (Annexure-4.5.B) &Goa vide mail dated

17.09.2020 (Annexure-4.5.C) had intimated their concurrence for two months

trial operation.

c) SR II, PGCIL vide E-mail dated 08.10.2020 (Annexure-4.5.D) had

communicated their concurrence for implementation of new RSD procedure on

trial basis for two months.

d) Puducherry vide letter dated 09.10.2020(Annexure-4.5.E) had communicated

their concurrence.



i. A Meeting in this regard was convened on 19.08.2020 and 03.09.2020 through

WebExVC.

ii. Beneficiaries are requested to give concurrence for trial of two months.

iii. TS, Puducherry, SR I, Orissa& Goa have furnished the details.

iv. APTRANSCO informed that they have put up to commercial wing. Decision

will be taken in the Commercial Committee Meeting which will be intimated

to SRPC.

v. TANTRANSCO will intimate the option by E-mail shortly.

vi. AP, TN, KAR, & SR II are requested to furnish the option at the earliest.

I. Subsequently TANTRANSCO vide letter dated 29.10.2020(Annexure-4.5.F)

had given concurrence for two months trial operation and Orissa vide letter

dated 13.10.2020 (Annexure-4.5.G) had communicated their concurrence for

implementation of new RSD procedure on trial basis for two months.

4.6 400 kV Hoody–Yelahanka&400 kV Hoody–Nelamangala

shutdown

a) The lines had been taken out on 05.03.2020.

b) In the 170th OCC Meeting, SR II had informed that the lines would be restored

by end of September 2020 (around 26th

).

c) SR II, PGCIL vide e-mail dated 06.10.2020 (Annexure-4.6.A) had furnished

the latest status of construction of 400 kV Pavagada-Devanahalli line in the

corridor of 400kV Hoody-Yelahanka and 400kV Hoody-Nelamangala lines.

The lines are expected by 20.10.2020.

In the Meeting the following were noted:

i. 400kV Hoody-Yelahanka and 400kV Hoody-Nelamangala lines are

expected by 20.10.2020

ii. SR II informed that Pavagada - Devanahalli line will be commissioned by

October end.

4.7 Expediting commissioning of AC transmission lines

emanating from Pugalur HVDC station


NLDC vide letter dated 10.07.2020 had expressed concern regarding delay in

commissioning of AC transmission lines emanating from Pugalur HVDC station.

NLDC had requested PGCIL, SR II that in order to improve the system at Pugalur

end and facilitate evacuation of power to the tune of 3000 MW (bipole capacity)

from Pugalur end, the completion of balance works of 400 kV Arasur and

Edayarpalyam lines from Pugalur HVDC station may be prioritized and

commissioning of these lines may kindly be expedited at PGCIL end.

In the Meeting SR II had furnished the following schedule:

a. 400 kV Pugalur - Arasur D/C: Commissioned.

b. 400 kV Pugalur - Edayarpalyam D/C : December 2020.

c. 400 kV Pugalur – Thiruvalam D/C: December 2020.

4.8 LC Oscillation / resonance during single phase Auto-

enclosure in over-compensated Transmission lines

The following were noted in the OCC Meeting:

i) SRLDC had informed that the proposal had been referred to CTU and

they are studying the same.

ii) SR II informed that they received permission from Corporate to

implement the scheme at SPDR – CTR.

iii) SR I informed that they have discussed with APTRANSCO(CE, Power

system) and this week end and works would be taken up to implement

the scheme at NPK-HPR.

4.9 Replacement of D 20 RTU with D400 RTU

a) The following were noted in the Meeting:

i. NLCIL TS II &TS I Expansion had confirmed that the concurrence has been

given to PGCIL in this regard. PO had been issued by PGCIL.

ii. KKNPP had earlier agreed for the replacement and concurrence needed to

be given to PGCIL.

iii. KGS concurred for the replacement and concurrence would be submitted to

PCCIL.

iv. MAPS (not present in the Meeting) is suggested to give concurrence to

PGCIL(else they needed to ensure the data availability themselves).

b) Subsequently KGS vide letter dated 27.10.2020(Annexure-4.9.A) had

communicated the concurrence to PGCIL.


4.10 Non-reporting of real time data of KTS-VI (Telangana) &

MTPS Stg-III (Tamil Nadu)

The following were noted in the OCC Meeting:

i. KTS-VI (Telangana): TS informed that material is expected by 10.10.2020.

Issues would be solved by next week.

ii. MTPS Stg-III (Tamil Nadu): TANTRANSCO informed that the issue is with

DCU which was under R & D period. R & D period is over and new tender has

been called. Tender opening is planned by October end.

4.11 Covid -19/Emergency control room operation

All the entities were suggested to maintain Emergency Control Rooms.

4.12 URTDSM project

The following were noted up to 170th

Meeting of OCC

a) Training

i. AP, KAR and KER had furnished the details of officials/modules for

the online training.

ii. TS, TN and Pudu stated that the training was required and they would

furnish the training requirement.

iii. SR I/SR II agreed to initiate action in this regard. iv. PED vide mail dated 29.09.2020 (Annexure-4.12. A) had have

informed that Puducherry Electricity Department, is not part of the

URDTSM Project and hence there is no nomination for the proposed

training in URDTSM from Electricity Dept, Puducherry.

v. TSTRANSCO vide E-mail dated 01.10.2020 (Annexure-4.12.B) had

informed that they require online training for analytical software and

PMU data based applications like LSE, stability issues like oscillations

identification, Eigen values computation(matrix pencil method) and

Relay vulnerability etc.. The details of officers nominated for training

also had been furnished.

vi. KPTCL vide E-mail dated 30.10.2020 (Annexure-4.12.C) had

intimated the following:

vii. The data reporting to PDC from the PMU’s commissioned in KPTCL

and Central Sector stations in Karnataka is taken through IEC 60870-

5-104 protocol from OSM Server to KPTCL SCADA system and

being used as standby data for SCADA. The PMU data is helping

greatly for fault analysis.


viii. However, the SLDC operators team to be trained on usage of PMU

data. Regarding Analytical Application, training needs to be given for

better usage.


a. AP, KAR, TS and KER had furnished the details of officials/modules

for the online training. Puducherry have informed that PED is not part

of the URDTSM Project and hence there is no nomination for the

proposed training in URDTSM.

b. TN is requested to furnish the details.

c. SR I informed that project is monitored by SR I but all the trainings

are arranged from Bangalore, SR II and would be carried out

according to the provisions in the contract.

b) URTDSM Phase – II Requirement

It was noted that AP, TS, KER& TN had furnished the requirements.

The following were noted in the meeting

i. It was noted that AP, TS, KER & TN had furnished the requirements.

ii. SRLDC had stated that OF communication availability at the

identified locations was to be confirmed by PGCIL. SR II suggested

for a separate meeting in this regard.

iii. A VC meeting would be called separately to discuss regarding the

requirements/ communication availability at identified nodes.

c) URTDSM Phase-I project

i) PGCIL, SR II(RTAMC) had requested to provide an operational

feedback regarding Phase-1 project which shall be submitted with

URTDSM Phase-II proposal.

ii) SRLDC vide communication dated 06.10.2020 (Annexure-4.12.D) had

furnished the operational feedback of the URTDSM Phase I. SRLDC had

suggested that it is desirable to include real time analytical applications

for enhancing efficiency and reliability of the grid operation in Phase II

of URTDSM Project. It would be better to consult real operators at

National, Regional and State levels for ascertaining the real time grid

requirements.

The following were noted in the meeting

i) SRLDC & KPTCL had furnished the feedback.

ii) Others are requested to furnish the details.


4.13 Non availability of OPGW on NTECL - North Chennai

lines (since October 2019)

In the 170th OCC Meeting, TANTRANSCO had intimated that works may be

completed in 2 months’ time (by 15th October 2020) (delayed due to Covid-19,

material allotted to contractor).

The following was noted in the meeting

TANTRANSCO intimated that allotment had been given to EE, Operation,

Manali. Works will be taken up.

4.14 Schedule fixation methodology adopted in SR

a) A web meeting on schedule fixation methodology adopted in SR was held on

15.05.2020. MoM issued on 22.05.2020 is available at SRPC website.

Advantages and disadvantages in the existing methodology in SR and other

regions were analyzed. After deliberations it was requested to beneficiaries to

revert back on their choice. Majority of constituents (KPTCL confirmation

awaited) agreed for adopting all India schedule fixation methodology in

Southern Region. SRPC Forum had suggested to SRLDC to take up the All

India methodology for Schedule fixation in SR.

b) SRLDC vide their mail dated 05.10.2020 had informed that SRLDC has taken

up with the developer for implementation of the above and required changes

were incorporated in the Web Based Scheduling program (WBES) w.e.f 00:00

hours of 20th September 2020. Communication sent to constituents and SRPC

in this regard is at Annexure 4.14.A.

1. The following changes were carried out in WBES:

i. RRAS will be dispatched one block at a time, after gate closure and RTM,

similar to triggering of SCED.

ii. SCED and RRAS will be dispatched simultaneously, 28 minutes before

start of the dispatched block, as opposed to 13 minutes now.

iii. Technical Minimum support through RRAS may be provided by

RLDC/NLDC operator as per requirement. The RRAS Technical

Minimum support will be visible 28 minutes before the start of the

dispatched time block, one at a time.

iv. In case the RRAS and SCED is not visible 5 minutes before the start of

the Dispatched Time block and the Ramp violation is due to RRAS/

SCED, the generators shall call and inquire from the SRLDC operator.


v. States may note SR ISGS Ramp Fixation (one step fixation) in line with

our Regions as per the OCC discussions.

This is for the information of the OCC forum.

4.15 Advisory on Spare Parts Management in Thermal Power

Plants

a) CEA vide letter dated 07.02.2020 has brought out "Advisory on Spare

Parts Management in Thermal Power Plants"(follow up action by CEA

on the Meeting held on 01.08.2019). The same is available at SRPC

website and also at CEA website.

b) Meeting in this regard was held on 24.06.2020 (State sector) and on

30.06.2020 (ISGS / ISTS).

All GENCOs were requested to take action for compliance of the

dvisory and furnish the details to SRPC.

4.16 Installation of PMUs/shifting of PMUs

The following was noted in the Meeting:

i. Trichur& Pugalur: SR II informed that two numbers of PMUs at

Pugalur have been installed and are reporting to SRLDC. The Order had

been placed on M/s GE and the supply is yet to be received (delayed due

to Covid).

ii. Narnoor, Mahboobnagar, Vemagiri to KTS VII (PST) &Vemagiri to

Ramadugu (LI): SR-I informed that M/s GE has submitted the drawings.

APSLDC & TSSLDC had approved the drawings and GE has to supply

the materials. APSLDC & TSSLDC were requested to coordinate in this

regard with GE. Placing Order is Powergrid’s responsibility, and further

coordination is to done by AP & TS.

iii. Trichy & Udumalpet STATCOMs 33 kV integration: SR-II informed

that Type Test is under progress. Cable would be dispatched by 15th

September 2020.

4.17 Upcoming Inter-Regional Links – Progress monitoring

TSTRANSCO vide letter dated 07.03.2020 had desired close monitoring of

two major upcoming inter-regional links in the OCC Meetings.


a) +/- 800 kV HVDC Raigarh- Pugalur:


i. SR II informed that Pole I is commissioned 06.09.2020 and at present

flow is 500 to 1500 MW.

ii. Pole II High power testing : 16th

Sep., 2020

Bipole Low Power testing: 23rd

Sep., 2020

Bipole High Power testing: 28th

Sep., 2020

iii. After the tests are over 10 days trial operation is scheduled.

iv. Commissioning is scheduled for October 2020.

b) 765 kV Warangal – Warora

TANTRANSCO had informed that a Petition was being heard at

CERC.

4.18 Energy Scheduled inside the region and outside the region

from RES(under GEC)

State/UT Action to be taken.

AP To submit Data up to September

2020.

KAR To Submit September 2020

data .

AP/KAR/KSEBL are requested to furnish the details upto September 2020.

4.19 Automatic Generation Control (AGC) implementation in

India

As per CERC Order dated 28.08.2019 all ISG stations whose Tariff is

determined or adopted by CERC should be AGC-enabled before 28th February

2020.

The following was noted in the Meeting:

i. NLCIL: ABB had given the work schedule for commissioning. Works

would be started by 12th

October 2020 and they have ensured that works

would be over by October end.


ii. NTECL: Panel had been received. Commissioning will be carried out by

mid-November 2020.

iii. NLC TS II - Exp: One channel testing is done while other channel

testing is pending. Testing would be done before commissioning of the

equipment.

iv. NTPC: AGC was being taken at Organization level (jointly for all the

stations).Order is placed on M/s ABB with completion schedule of Dec

2020. Individual stations were in touch with M/s ABB. Works are

moving as per schedule. Talcher may be slightly delayed due to Covid

issues.

v. NTPL: Material received on 22.06.2020 from vendor(ABB). Erection

and commissioning would be completed before 31st October 2020. SR

II informed that OPGW stringing and panel erection are over. Next week

commissioning can be carried out.

vi. NNTPP: SR II had confirmed that works are over.

4.20 AGC at state Level- Pilot Project identification &

Implementation

The following was noted in the OCC Meeting:

i. Andhra Pradesh (APGENCO: earlier Krishnapatnam): APTRANSCO

mentioned that in addition to Krishnapatnam they are planning for AGC at

VTPS, RyTPP, Upper Sileru& Lower Sileru. They have approached

APERC with the proposal. Concurrence from APERC is awaited.

ii. Karnataka (KPCL: Sharavathy-100 MW / Varahi-80 MW): KPCL

informed that works would be completed by December end at

Sharavathi. Varahi would be taken up subsequently.

iii. Kerala (KSEBL: Kuttiadi -50 MW & Idukki): KSEBL informed that

Kuttiadi comes under must run unit, at present and AGC is disabled. SRPC

requested KSEBL to put back the unit if it is not under Must Run status. At

Idukki, dedicated communication channel is required (FO to be laid) and it

will take couple of months to complete the works. For AGC on regular basis

Regulator has been approached.

iv. Tamil Nadu (TANGEDCO: North Chennai Stage-II-60 MW and

MTPS Stage II-60 MW each):TANGEDCO informed that

communication has to be established from NCTPS Stage II and MTPS to


SLDC. One more meeting was carried out with KSEBL on 30.09.2020.

Implementation will take another two to three months.

v. Telangana (TSGENCO: Kothagudem E-132 MW downward):

TSGENCO informed that the supply is expected by 10.10.2020.

Communication availability had already been tested.

vi. NP Kunta AGC: Will be informed later by SRLDC.

4.21 Insulator replacement in Sirsi-Guttur section of Kaiga -

Guttur

KPTCL had informed the retendering has been carried out on 29.07.2020 for

55 numbers of long rod Silicone insulators (to replace existing disc insulators).

Retendered on 29.07.2020. Evaluation completed. Approval awaited from

CEE Tz Bagalkot.

4.22 Rectification of OF cable between EDC to HAL

KAR SLDC had informed that the issue had been flagged to Director

(Transmission), KPTCL. CE Transmission Zone is seeking approval from

BBMP etc. SLDC is following up the issue.

4.23 Daily Load Forecasting by SLDCs

a) In the Meeting, SRLDC had presented the load forecast error (forecast

Vs actual demand) for the month of September 2020which is at

(Annexure-4.23.A)

b) It was noted that in the 170th

OCC Meeting, MS SRPC had requested

SRLDC to project Demand and Energy consumption curve from

171stOCC Meeting onwards with a comparison with last year same

month data. SRLDC is requested to project the same from next OCC

Meeting onwards.

4.24 Renewable forecasting

a) All states had been requested to furnish the implemented forecast, day

ahead forecast & actuals also (before 5th

of every month). It was noted

that this data was being sought by higher forums and other entities.

b) In the Meeting it was requested to SRLDC that in the 172nd

OCC

Meeting the analysis for September and October 2020 may be

presented.


4.25 Status of Implementation of the revised FGD

Installation/ESP Up-gradation Plan

a) CEA/MoP is seeking updated information in respect of implementation of

revised FGD installation/ ESP Up-gradation Plan and the regular updated

may kindly be furnished.

b) Units need to necessarily comply with norms, as per CPCB timelines

and changes thereof. This is a monitored activity by Hon’ble Supreme

Court and also by Government.

c) TANTRANSCO had furnished (Annexure-4.25.A) status of

implementation of the revised FGD installation/ESP up gradation plan.

The forum requested the concerned to comply with norms, as per

CPCB timelines and changes thereof. Since the activity is monitored

by Hon’ble Supreme Court / Government.

4.26 PSP- daily Demand and Consumption pattern

a) CEA had sought daily Demand and Consumption pattern and the reasons

for significant variations w.r.t last year and past few days. The format in

this regard has been communicated to States and SRLDC by mail dated

21.04.2020 by SRPC.

State/UT Action to be taken

AP Sep 2020 data to be furnished

KAR Till Sep 2020 data to be furnished

TN Till Aug 2020 data to be furnished. Sep 2020 data

furnished

TS Sep 2020 data to be furnished

Pudu Sep 2020 data to be furnished

4.27 Category wise consumption pattern

a) CEA vide E-mail dated 17.03.2020 had sought category-

wise consumption of electricity in the States/UTs. RPCs had been

requested to discuss/collect the following in OCC meetings on a regular

basis:


b) The format for furnishing the data is as below: (also forwarded by SRPC

mail dated 13.04.2020.

Data format for consumption data

Category

Domestic

Agricultura

l

Industrial

Traction

Commercial

Month MU % MU % MU % MU % MU %

March 2019

March 2020

c) The following was noted:

State/UT Action to be taken

AP To submit August -September 2020 data

KAR To submit August -September 2020 data

KER To submit August -September 2020 data

TN Agricultural consumption to be furnished for Sep

2020

TS To submit September 2020 data

Pudu To submit September 2020 data

d) States/UT to furnish the information in time bound manner.

e) MS SRPC requested all the states to continue to furnish the information on

monthly basis without fail since CEA is monitoring the data very seriously.

He thanked all the States for the support given to submit the data.

4.28 PSS Tuning of generators

a) A Meeting to discuss the submitted reports and to discuss the status of

schedule of PSS tuning/SRT was held on 14.11.2019.

b) The PSS/SRT tuning reports for following 22 Units have been submitted

after the 7th PSS meeting:

Entity Generating Stations/Units

APGENCO RTPP Unit 4; VTPS Units 1,2,3,4,5,7

TSGENCO KTPS Units 9,10,11

KAR IPPs JSWEL U4

TANGEDCO TTPS unit 4

CGS KKNPP Unit 2; NTPC Simhadri Units 1 to

4; KAIGA Unit 4


ISTS connected IPPs SEIL P-II Units 1, 2; IL & FS Units 1, 2

i. The PSS/SRT tuning reports for around 30 Units have been submitted

after the 7th PSS meeting.

ii. A meeting would be called in November end to analyze the reports.

iii. All GENCOs to complete PSS Tuning/SRT wherever due.

iv. GENCOs to take action as per the Minutes of the 7th

PSS Meeting.

4.29 TSTRANSCO request for GIS details of SR I Lines.

i. TSTRANSCO requested GIS coordinates of Towers. For planning future

lines also this is very much required.

ii. SRPC suggested that PGCIL & TSTRANSCO to coordinate mutually in this

regard.

4.30 Request from SRLDC to give information of Nodal

officers

SRLDC informed that new POC will be implemented shortly. All DICs

(individually) are requested to furnish the details of Nodal Officer who can

change the data in Web Based Applications for making the Base Case. All ISG

Stations, IPPs & State Generators are requested to furnish the details at the

earliest.

4.31 Action Plan for Commissioning the work of Shifting of

Control and Protection for 400kV Mysore 1- Tie-Bidadi 1

(Dia 1) and Mysore 2- Tie-Bidadi 2 (Dia 2) at 400kV

Receiving station Nelamangala.

a) KPTCL vide E-mail dated 07.10.2020 (Annexure- 4.31.A) had forwarded

the Action Plan for Commissioning the work of Shifting of Control and

Protection for 400kV Mysore 1- Tie-Bidadi 1 (Dia 1) and Mysore 2- Tie-Bidadi

2 (Dia 2) at 400kV Receiving station Nelamangala. The action plan is planned

from 12.10.2020 to 06.11.2020.

b) Request communication(05.10.2020) for shutdown to KPTCL from TL &

SS Division, Nelamangala is at (Annexure- 4.31.B)

c) Minutes of the Meeting held between M/s KPTCL & M/s PGCIL at 400 kV

receiving station at Nelamangala on 03.10.2020 is at Annexure- 4.31.C



i) KPTCL informed that there won’t be any load interruption and requested for

Shutdown approval. The request was submitted to SRPC in mid review

approval.

ii) SRPC informed that since there was some issue in the program SRPC/

SRLDC couldn’t receive the request.

iii) SE (O), SRPC requested KPTCL to request for shut down may be submitted

in coordination with SRLDC.

5 For Information of the OCC

5.1 Test synchronization of Gas Turbine Generator of YCCP

(1x370) MW to 220 kV Grid

a) KPCL vide letter dated 21.09.2020 (Annexure-5.1.A) had informed that it is

proposed to synchronize the 236.82 MW Gas Turbine Generator and 133.225

MW Steam Turbine generator of YCCPP to 220KV Grid in two phases. As

the intensive testing of 236.82 MW Gas Turbine Generator is successfully

completed, it is planned to test synchronize the unit to 220KV grid through

Generator Circuit Breaker (GCB) on 28/09/2020in the first phase. The unit

will be loaded around 20 to 25MW for 30minutes to observe the critical

parameters of the Machine.

b) In the Meeting KPCL informed that it was planned to test synchronise the

YCCP Gas turbine Generator (370 MW) on 02.10.2020. Pre-Commissioning

works under progress and at 3000 rpm, Turbine tripped on protection and a

freak fire accident occurred in Gas Turbine cubicle at around 3.00.Hrs. The

fire was immediately extinguished. Further Route cause analysis,

investigations and modification works under process. Further date of test

synchronization will be informed later.

5.2 Preparedness for North-East Monsoon

a) TNSLDC vide their letter dated 24.09.2020 (Annexure-5.2.A) had given

instructions to all concerned wings that necessary preventive maintenance of

all the substation equipment and associated lines have to be taken up

immediately.


5.3 Stakeholder consultation for finalization of transformers /

associated bays under TC/ACC/NC-RE/other components

i. CERC vide notification dated 04.05.2020 has issued the Central Electricity

Regulatory Commission (Sharing of Inter-State Transmission Charges and

Losses) Regulations, 2020. As per the Regulations, the yearly transmission

charges are to be recovered under four heads:

a. National Component

b. Regional Component

c. Transformer Component

d. AC Component

ii. Guidelines regarding classification of transmission system elements under each

of the above four components have also been given in the above regulations. As

per the regulations,

a. Transformer Component for a State shall be borne and shared by the drawee

DICs located in the concerned State in proportion to their Long Term Access

plus Medium Term Open Access.

b. The treatment of transformers used for drawl requirement of more than one

State has been included in the 2020 Sharing Regulations as

follows: “transmission charges shall be apportioned to each State in the ratio

of number of feeders from such transformer for each State”.

c. Further, transformers used for evacuation of power (non-RE) shall be

included under AC-System Component while those used for evacuation

of RE power shall be included under NC-RE component.

d. The details of transformers (including associated bays and downstream bays

such as 220 KV bays wherever constructed as part of ISTS) to be included

under Transformers Component are to be worked out by CTU after

consultations with stakeholders.

iii. CTU vide E-mail dated 07.10.2020 had furnished the list of transformers and

downstream bays (both under RTM & TBCB). Same has also been uploaded on

CTU webpage at https://webapps.powergrid.in/ctu/u/default.aspx. It is

requested that observations/comments, if any, on the above proposal may be

forwarded to CTU latest by 20/10/2020 so that they can proceed further. In case

of non-receipt of observations/comments by 20/10/2010, it shall be inferred that

the entity is in agreement with the proposal.


I. All stake holders are requested to vet the data and revert back to CTU.

https://webapps.powergrid.in/ctu/u/default.aspx


II. TSTRANSCO had informed regarding some data non availability of

Regional Component and National Component Data. They requested for

ISTS lines which is being included in AC Component.

III. SRPC suggested TSTRANSCO to communicate CTU directly with a copy

to SRPC so that SRPC will also furnish the same to CTU.

5.4 From MNRE side the following could be noted:

i. Association of Renewable Energy Agencies of State (AREAS) proposes

to promote innovative Decentralized Renewable Energy (DRE) solutions

for rural livelihood applications through financial assistance. Accordingly

proposals are invited from innovators, technology developers,

manufactures etc. that have developed and demonstrated innovative DRE

solutions for different rural livelihood applications. The proposals needed

to be sent by 19.10.2020.

ii. Has published Revised list of Models and Manufactures (RLMM) as on

30.09.2020.

iii. The Government of India, Department for Promotion of Industry and

Internal Trade (DPIIT) issued Public Procurement (Preference to Make

in India), Order 2017 for encouraging 'Make in India'and promoting

manufacturing and production of goods and services in India with a view

to enhancing income and employment. Further, DPIIT vide order No.P-

45021/212017-PP (BE-Il) dated 4th June, 2020, have issued the revised

Public Procurement (Preference to Make in India) Order 2017. Further

MNRE had released new Order dated 23.09.2020.

iv. MNRE vide Resolution dated 25.09.2020 had notified Amendments to the

Guidelines for Tariff Based Competitive Bidding process for

procurement of Power from grid connected Solar Power Projects.

v. MNRE vide Corrigendum dated 28.10.2020 had extended date of

submission of bids up to 22nd

October 2020 w.r.t .“Developing a Long-

Term Vision, Implementation Plan, Road Map And Institutional

Framework For Implementing “One Sun One World One Grid”, dated

27.05.2020“

vi. Invitation for Expression of Interest (EOI) for installation of innovative

solar pump. Ministry of New and Renewable Energy (MNRE) has issued

Guidelines for promoting innovative solar pumps vide OM of even number

dated 22.06.2020. These guidelines are applicable for all Indian


innovators/manufacturers/service providers, who wish to include

innovative stand-alone solar pumps technologies/models under Schemes

operated by the MNRE. MNRE had invited

innovators/manufacturers/service providers to submit expression of

interest to participate in the above-mentioned scheme for promotion of

innovative solar pump technologies.

vii. MNRE had calledInvitation for Expression of Interest (EOI) for

conducting evaluation of Off-grid and Decentralised Solar PV

Applications Programme Phase-III.

5.5 From MOP side the following could be noted

i. MoP vide notification dated 01.10.2020 had published Draft Electricity

(Change in Law, Must Run status and other Matters) Rules, 2020. These

rules are proposed for pass through in cases of Change of Law and

compensation to RE generators for loss of generation due to non-

scheduling by the procures/intermediary procurers. The comments are

requested by 22.10.2020.

ii. Draft SBD- Guidance Note to SBDs for Privatization of Distribution

Licensees : The Ministry of Power had issued the Standard Bidding

Documents (SBD) for encouraging and supporting acceleration of Private

Sector Participation (PSP) in power distribution utilities across the

country.

5.6 UPCL vide E-mail dated 07.10.2020 (Annexure- 5.6.A) had submitted the point

wise compliance of OCC Agenda issues w.r.t UPCL. It is requested to all entities to kindly furnish the updates on each agenda item before the OCC Meeting so that time may be utilized for deliberations on the serious issues.

6. Outage Proposals/LGBR

6.1 Monthly Review of Maintenance schedules of ISGS :

a. (i) All the Generators were requested not to revise their AMP frequently

unless otherwise, if required, depending on that time Grid condition.

There are many revisions in the outage schedules for the maintenance of

various generating Units which could be seen from the following Table

No. 6.1.a and also multiple revisions in respect of the same Unit too.


Hence, MS, SRPC expressed concern on the frequent revision in

maintenance schedules and requested the Generators to avoid frequent

changes in the outage planning.

SL Name of the

Unit

Original

Maintena

nce

Schedule

Revised

Schedule

in 169

OCC

Revised

Schedule

in 170

OCC

Revised

Schedul

e in 171

OCC

1 200 MW

RSTPS Unit 2

20.07.20

–

01.11.20

15.01.21 –

31.03.21

09.09.20 –

18.10.20

09.09.20

–

05.11.20

2 200 MW

RSTPS Unit 3

23.12.19

–

31.03.20

30.09.20 –

12.01.21

01.11.20 –

13.02.21

15.12.20

–

29.03.21

3 500 MW

RSTPS Unit 5

27.10.20 –

23.11.20

27.10.20 –

23.11.20

27.10.20 –

05.12.20

25.11.20 –

03.01.21

4 500 MW

RSTPS Unit 6

10.06.20 –

09.07.20

15.12.20 –

13.01.21

25.08.20 –

03.10.20

25.08.20 –

12.10.20

5 500 MW

Talcher TSTPS

Unit 5

27.05.20 –

25.06.20

Dec / Jan,

2021

Dec / Jan,

2021

25.12.20 –

28.01.20

6 500 MW

Talcher TSTPS

Unit 6

01.09.20

–

15.10.20

27.10.20 –

10.12.20

04.11.20 –

18.12.20

04.11.20

–

18.12.20

7 800 MW Kudgi Unit 1

01.07.20 –

15.08.20

01.10.20 –

29.11.20

Postponed

indefinitel

y

Postpone

d to avail

during

June /

July,

2021

8 500 MW

Simhadri Unit

2

Not

planned

20.11.20 –

03.01.21

20.11.20 –

03.01.21

20.11.20 –

03.01.21

9 500 MW

Simhadri Unit

4

25.07.20 –

07.09.20

09.01.21 –

17.02.21

09.01.21 –

17.02.21

09.01.21 –

17.02.21


10 500 MW

NTECL Unit 1

13.07.20 –

31.08.20

23.11.20 –

11.01.21

23.11.20 –

11.01.21

23.11.20 –

11.01.21

11 500 MW NTPL

Unit 1

09.09.20

–

13.10.20

07.09.20 –

11.10.20

Postponed

to Dec /

Jan, 2021

01.12.20

–

04.01.21

Table No. 6.1.a

(ii). It can be seen from the Table No. 6.1.a that shut down of RSTPS

Unit 3 & 5 amounting to 700 MW have been further postponed by NTPC

in the 171stOCC. NTPC / NTECL were requested in the meeting to avail

all the maintenance schedules by Pongal / Shankranti.

b. NLC TS II 210 MW Unit 3 postponed : NLC TS II vide their mail

dated 26.09.2020 (Copy enclosed as Annexure No. 6.1.b) informed

that they were forced to shut down their Unit 3 on 25.09.2020 at 9:56

hrs, due to breakdown of ABG and their overhaul programme scheduled

for 23 days from 28.11.2020 to 20.12.2020 would be availed as OSD

during this forced outage period. In the meeting, it was informed that

unit would be revived on 17.10.2020.

c. Outage plan in respect of 800 MW Kudgi Unit 1 :

i. NTPC informed in the 170th

OCC meeting that maintenance schedule

of NTPC Kudgi Unit 1, which was planned earlier in 167 OCC to

avail during Oct-Nov, 2020, has been postponed indefinitely. They

also stated that the revised schedule would be informed after finalising

the same.

ii. In the meeting, NTPC informed that the outage will be availed during

June / July, 2021 only in respect of Kudgi Unit 1 and the Unit would

be available during the peak demand period of Southern Region.

d. Uncertainty in the outage plan in respect of NTPL 500 MW Unit 1 :

i. NTPL vide their letter dated 25.08.2020 (Copy enclosed as

Annexure No. 6.1.d) informed that M/s BHEL and M/s Dowell

Erectors could not carry out the overhaul approved in the 169th OCC

in respect of their Unit 1 to avail during 07.09.2020 – 11.10.2020 due

to covid-19 pandemic and hence they postponed the overhaul


programme. They also informed in the 170th OCC meeting that they

would inform their revised schedule after firming up with their OEM

and added that their Unit outage may be availed during Dec / Jan,

2021.

ii. In the meeting, it was informed by NTPL that Unit 1 outage would

be availed during 01.12.2020 – 04.01.2021 for 35 days. OCC Forum

requested to complete their maintenance outage as per the said

schedule and suggested them to postpone to June, 2021, if not

possible to revive the Unit 1 by 04.01.2021.

e. Postponement of 200 MW RSTPS Unit 3 :

i. NTPC informed vide their mail dated 08.09.2020 (Copy enclosed as

Annexure No. 6.1.e.i) that RSTPS Unit 3 maintenance schedule has

been postponed to 01/11 - 13/2 (105 days) due to mobilization issues

by BHEL / NGSL for R&M works of ESP and TG and confirmed the

same in the 170th

OCC meeting.

ii. KSEBL letter dated 15.09.2020 (Copy enclosed as Annexure No.

6.1.e.ii), expressed concern that the outage of RSTPS Unit 3 has been

postponed while the demand is likely to pick up by the end of January

and availability from CGS is crucial to meet the LGB for the States.

They also expressed concern that assembly elections are also due in

the next summer in several States, including Kerala.

iii. A letter in this regard, has been sent to NTPC by SRPC on 18.09.2020

(Copy enclosed as Annexure No. 6.1.e.iii) requesting them to avail

the outage by Pongal / Shanranti or to avail after the forthcoming

summer.

f. Aggregation of outage quantum during November / December, 2020

& Peak demand period of SR (January – March, 2021) due to

COVID -19 :

i. There were major changes in outage plan of generating units for the

FY 2020-21 due to men & material availability and other restrictions

on account of COVID-19. SRPC had expressed concern that outage

of generating units in SR during November / December 2020 which

got further aggregated to around 9,000 MW (includes Thermal,

Hydel, MPP/IPP) maintenance shut down whereas during October

2020, the total outage of SR Generating Units would be less than 2000


MW. SRPC further expressed concern that some outage of Generating

Units may get postponed to the SR Peak Demand period of January –

March, 2021.

Graph 1

ii. In 170

th OCCM (11.09.2020), it was observed that around 4500 MW

of outage of CGS units of SR would be availed during the period

November 2020 to January 2021 and the same was brought down to

4000 MW (Graph-1) in 171st OCCM. Therefore, all NTPC / NTECL

/ NTPL were requested in the 170th

and 171st OCC meeting to avail

and complete all the maintenance schedules by Pongal / Shankranti

(January, 2021).

iii. As per the outage planning of generating units in SR (Graph-2), it

was observed in the 171st OCCM that the possibility of availing

maintenance shutdown during October, 2020 could be explored. It is

a matter of concern that around 9,000 MW of outage during

November / December, 2020, around 5000 MW during January 2021

and 2000 MW (CGS) during February / March, 2021 have been

proposed against the outage of around 2000 MW originally planned

to avail during January / February / March, 2021 in SR.

4500 ISGS : Outage in MW for the year 2020-21

4000 (April to March) - MW stacked, Entity wise

3500

3000

2500

2000

1500

1000

500

0

NPCIL

NLC

NTPC

Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar 1st 1st 1st 1st 1st 1st 1st 1st 1st 1st 1st 1st Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk

Weeks

Ou

tage

in M

W


Graph - 2

g. Uncertainty in the outage plan in respect of 500 MW Talcher Unit 5

:

i. NTPC informed in the 170th

OCC meeting that maintenance schedule

of NTPC Talcher Unit 5, which was planned originally to avail during

27.05.2020 - 25.06.2020, has been postponed to avail during Dec /

Jan, 2021, after the revival of their Unit 6.

ii. NTPC informed in the meeting that the maintenance schedule of Unit

was under finalisation and would be informed shortly. OCC requested

NTPC to plan this shut down to complete by Pongal / Shantranti and

to submit their schedule at the earliest.

iii. It is a matter of concern that NTPC vide their mail dated 17.10.2020

furnishing 182nd

LGBR data for the period October, 2020 – March,

2021, informed that their Unit 5 has been scheduled to avail

maintenance shutdown during 25.12.2020 – 28.01.2021. The

possibility of postponing this outage to avail after forthcoming

summer may to be explored.

h. Postponement of 500 MW Talcher Unit 6 :

i. In the meeting, NTPC informed that shutdown of 500 MW Unit 6 of

Talcher would be availed from 04.11.2020 to 18.12.2020 as approved

in 170 OCC for 45 days. While SRPC requested NTPC to avail their

10000 Southern Region : Outage in MW for the year 2020- 21 (April to March)

8000

6000

4000

2000

0 Apr Apr May Jun Jul Jul Aug Sep Oct Oct Nov Dec Jan Jan Feb Mar 1st 4th 3rd 2nd 1st 4th 3rd 2nd 1st 4th 3rd 2nd 1st 4th 3rd 2nd Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk Wk

Weeks

Ou

tage

in M

W


Unit 6 outage from 08.11.2020 – 22.12.2020, they informed that Unit

6 Boiler License is to renewed on 04.11.2020 and subsequently, vide

their mail dated 10.10.2020 (Copy enclosed as Annexure No. 6.1.h),

NTPC informed that the boiler license of the unit which is under

extension, is valid till 3rd

Nov-2020 and they are committed to take

the shutdown as per the plan as Govt of Odisha would not extend the

boiler license.

ii. TSTRANSCO requested to club Talcher Unit 6 outage along with

Talcher – Kolar Pole outage proposed from 19th – 21

st, December,

2020.

iii. NTPC was requested to avail either Unit 5 or Unit 6 maintenance

outage along with Talcher – Kolar Pole outage.

i. Postponement of 220 MW KGS Unit 1 of Kaiga Stage I & Unit 3, 4

of Stg II :

i. NPCIL informed vide their mail dated 05.10.2020 (Copy enclosed as

Annexure No. 6.1.i.i.a) that the maintenance schedule of their Unit 1

has been postponed from 22.11.2020 to February / March, 2020 as

discussed by them with their Head quarter and subsequently informed

vide their mail dated 12.10.2020 (Copy enclosed as Annexure No.

6.1.i.i.b) that Unit 1 would be availed during 15.02.2021 to

30.03.2021

ii. NPCIL informed vide their mail dated 08.10.2020 (Copy enclosed as

Annexure No. 6.1.i.ii) that the maintenance schedule of their Unit 3

has been postponed from 01.11.2020 – 14.01.2021 to 22.11.2020 –

01.02.2021 and subsequently confirmed vide their above said mail

dated 12.10.2020 that Unit 3 would be availed during 22.11.2020 to

02.02.2021. They had already informed vide their original Annual

Plan that Unit 4 would be availed for 10 days between October to

December, 2020 for the erection work of Generator Unit 3 and now

they have proposed vide their above said mail dated 12.10.2020 to

avail 15 days outage of Unit 4 from 01.12.2020 to 15.12.2020.

iii. It was noted in the meeting with concern that all NTPC / NTECL /

NTPL Generators were requested in the past OCC meetings to avail

and complete all the maintenance schedules by Pongal / Shankranti.

However, the action taken by NPCIL to avail during February /


March, 2020 will highly affect the LGB of SR as KKNPP Unit 1

would be also out in this period and the outage of 2000 MW in SR

during this period will further go up to 2400 MW during the overlap

period of the NPCIL Units.

iv. NPCIL was requested to review their decision to postpone the above

maintenance schedules and requested to complete by Pongal /

Shankranti 2021 as discussed in the earlier OCC Meetings or to avail

after May, 2021.

v. NPCIL assured in the meeting that they would ensure availability of

3 Units during Nov / Dec / Jan, 2021 and 2 Units during Feb / March,

2021.

j. Preponement of 500 MW Simhadri Stage I, Unit 2 due to turbine

shaft vibration :

i. It was noted with concern in the meeting that some of the Generating

Units of NTPC have been scheduled earlier than their original

maintenance schedule due to turbine shaft vibration issue.

ii. NTPC vide their mail dated 08.10.2020 furnishing 182nd

LGBR data,

informed that they would avail 45 days of maintenance due to turbine

shaft vibration issue in respect of 500 MW Simhadri Stage I, Unit 2,

which was not scheduled originally during the year 2020-21 and

already availed in July, 2019 for 33 days.

iii. Therefore, NTPC was requested in the meeting to analyse the causes

for the frequent turbine shaft vibration issues faced by their Units and

to come out with report.

k. The list of maintenance schedules of ISGS and MPPs proposed to avail

during the period of current month and next month period (October /

November, 2020) and postponed from these periods were mailed to

OCC Google Group on 04.10.2020 and reviewed in the meeting. The

approved list of maintenance schedules of ISGS and MPPs was mailed

to OCC Google Group on 12.10.2020 (copy enclosed as Annexure No.

6.1.k).


6.2 Processing of monthly outage proposals of Transmission Lines and Elements

a. The outages proposed for the month of November, 2020 in respect of

Transmission Lines and Elements proposed by other regions, State

Transmission Utilities, PGCIL and other transmission Entities were

processed and discussed in the Outage Coordination Meeting held on

07.10.2020 through WebEx.

b. The list of outages of Transmission Lines and Elements, approved in the

Outage Coordination Meeting, was uploaded in PWC Web portal as well

as in SRPC Website and mailed to OCC Google Group, also on 07.10.2020.

c. 400 kV Hoody – Yelahanka & 400 kV Hoody – Nelamangala Shutdown

i. These lines had been taken out by PGCIL SR 2 on 05.03.2020.

ii. KPTCL expressed concern on the delay and requested to complete the

restoration works on priority.

iii. PGCIL SR 2 informed in the meeting that these lines would be

restored by 20.10.2020. However, later it was informed that

restoration of these lines was postponed to 28.10.2020.

iv. PGCIL SR 2 was advised to avail the outage of their 400 kV Kolar –

Hoody Line proposed during 7,8 & 9th

Novemebr, 2020, only after

charging these lines.

d. Prolonged outage of 400 kV NCTPS Stage II – Vallur Circuit 1 :

i. The shutdown of 400 kV NCTPS StageII – Vallur 1 was taken on

19.03.2020 and was under prolonged outage due to problem in Earth

Switch.

ii. NTECL vide their mail dated 01.10.2020 informed that the line was

charged on 14.09.2020 within the fresh clearance due date 19.09.2020

and confirmed the same in the meeting.

e. 400 kV Pavagada - Devanahalli construction works :

i. SR II, PGCIL vide e-mail dated 06.10.2020 (Copy enclosed as

Annexure No. 6.2.e) had furnished the latest status of construction of

400 kV Pavagada-Devanahalli line in the corridor of 400kV Hoody -

Yelahanka and 400kV Hoody-Nelamangala lines. In the meeting, it was

confirmed by PGCIL that the lines are expected by 20.10.2020.


ii. However, it was informed later on 20.10.2020 that restoration of these

lines were postponed to 28.10.2020 as their work got delayed due to rain

and tower top painting work, which is under Aviation Zone, was under

progress.

f. Shutdown proposal of Talcher - Kolar Bipole :

i. PGCIL, SR II vide letter dated 06.10.2020 (Copy enclosed as Annexure

No. 6.2.f) had requested for shut down of Talcher - Kolar bipole from

19.12.2020 to 22.12.220 to carry out the stringing works of electrode line

for the diversion of crossing of upcoming M/s East Cost Railway line.

They stated that the tower erection were completed and the stringing

works of the electrode line at two locations (37-38, 39-40) are to be

carried out for which shutdown of both the poles are required.

ii. There was insulation failure of smoothing reactor of Pole I on

19.09.2020 due to heavy pollution at Talcher, which lead to forced

outage of Pole I. Hence they have planned to take up RTV coating of all

terminal station DC equipment at Talcher end during bipole shutdown

and further one more day shutdown is required for pole II to complete

RTV coating of Pole II DC equipment at Talcher end, as shown below :

SI

No

Element Date/Time No of

days

Remarks

1 Bipole 19.12.2020, 07:00 hr

to

20.12.2020,

17:00 hr

2 Stringing works at

(37-38, 39-40. Pole I

shall come in to

service after bi-pole

shutdown. Pole II

will remain open

2 Pole 2 20.12.2020,

17:00 hr

to

21.12.2020,

17:00 hr

1 RTV coating of

Smoothing reactor

as a preventive

measure & Terminal

station maintenance

works at both ends

iii. In the meeting, PGCIL informed that along with this outage, annual

Maintenance work scheduled earlier to avail during 09.01.2021 –

13.01.2021 has been clubbed and they will not avail any maintenance

outage during the forthcoming SR Peak Demand period.


6.3 Shutdown proposal for 400 kV Simhadri – Kalpaka Ckt 3&4 by APTRANSCO :

(a) APTRANSCO submitted their revised proposal vide their letter dated

01.10.2020 (Copy enclosed as Annexure No. 6.3.a) to avail outage

during November / December, 2020 in respect of the following lines :

(i) Simhadri – Kalpaka Ckt 3&4 : 23.11.2020 –

17.12.2020

(ii) Simhadri - NTPC Vemagiri_AP 1 : 20.11.2020 –

20.12.2020

(iii) 400 kV Kalpaka – NTPC Vemagiri_AP 1 : 20.11.2020 –

20.12.2020

(iv) APTRANSCO informed that the temporary modification

arrangement is to tie up 400 kV Kalapaka – Vemagiri and STPP –

Vemagiri (AP) by dismantling the jumpers at Loc.no.3/D,

providing cross jumpering near Loc.No.03 as done on Nov/Dec,

2018.

(v) They also stated that re loading of relay settings for the modified

Line and re-installation of SEM Meters will be done at the Panel in

Kalpaka SS, 2 Nos. of CBs at Vemagiri pertaining to STPP and

Kalpaka will be in off condition and after commissioning / charging

STPP – Kalpaka 3&4, STPP – Vemagiri and Kalpaka – Vemagiri

would be normalised back.

(vi) In the meeting, TSTRANSCO requested not to reduce their share

from Simhadri Stage I during the shutdown period and hence OCC

suggested that APTRANSCO would avail this outage during

Simhadri Unit 2 outage proposed from 20.11.2020 to 03.01.2021.

(vii) APTRANSCO also requested to concur cross jumpering

arrangement proposed by them from STPP Simhadri – Vemagiri to

Kalpaka – Vemagiri Line temporarily.

(viii) OCC Forum agreed to avail the said outage after Simhadri Unit 2 is

taken off bar on 20.11.2020 and requested APTRANSCO to

complete the tower installation works and to charge back the lines

before the Unit 2 is revived. The outage of 400 kV Simhadri –

Kalpaka Ckt 3&4 are to be availed in coordination with the

outage of NTPC Simhadri Stage I, Unit 2. Moreover, 400 kV

Simhadri - NTPC Vemagiri_AP 1 & 400 kV Kalpaka – NTPC


Vemagiri_AP 1 are also to be charged back with the original

configuration.

6.4 Opening of 220 kV Kadakola - Kaniyampeta line (Agenda No.3.15) :

a. 220 Kadakola - Kaniyampeta line outage for providing intermediate tower

in the forest area at sagged locations, proposed by KPTCL was taken up by

KSEBL with their higher level management and they requested KPTCL to

furnish the schedule of maintenance activities along with the timeframe so

that KSEBL can concur the shutdown.

b. KPTCL replied vide their mail dated 09.09.2020 attaching their letter dated

27.07.2020 and in the meeting confirmed that NIT for the said work was

issued on 27.07.2020 from CEE T&P. It was also informed that Technical

Bid opened on 29.08.2020 and tender under evaluation at CEE T&P.

Completion period would be 12 months from the date of award of Contract.

c. KSEBL agreed for the execution of intermediate tower installation works

and requested KPTCL to ensure the above timelines.

d. In the meeting, KPTCL was requested to submit their outage schedule vide

PWC Portal.

6.5 LGBR, Review LGBR & Outage Planning for the year 2021-22 :

(a) Annual LGBR & Demand and Energy Forecast for the year 2021-22

:

i. All the States / Generators / Transmission Entities were requested vide

letter dated 10.09.2020 to send data to SRPC by 31st October, 2020 in

the prescribed excel format to enable timely finalization of draft outage

planning for the year 2021-22 and to prepare draft LGBR for the year

2021-22.

ii. Very few Generators (TN Gas based Units, NTECL, HNPCL, NTPL,

NLC TS 1 Exp & NNTPP) had only submitted the data. In the meeting,

other Generators and Constituents were requested to submit the data.

iii. The Constituents were requested in the meeting to furnish month wise

Demand and Energy Forecast for the year 2021-22 on top priority.

SRPC has prepared State wise Demand and Energy Forecast for the year

2021-22 (Copy enclosed as Annexure No. 6.5.a.iii). In case of more


deviation in their forecast, constituents may please furnish the reason for

additional / less consideration also.

iv. The Constituents / States / Generators were also requested in the meeting

to furnish annual maintenance schedule in respect of Generating Units,

Transmission Lines and Elements for the year 2021-22 on top priority.

(b) Quarterly Review of LGBR :

i. The Review LGBR (182 LGBR) for the period October – March,

2020-21 has to be prepared by SRPC. All the Constituents were

requested in the 170th OCC Meeting to submit their LGBR data along

with the revised maintenance schedules, if any, in the prescribed

format. APTRANSCO, KSEBL and TANTRANSCO submitted the

data.

ii. KPTCL, TSTRANSCO, NPCIL, NLC TS II, NLC TS II Exp, NTPL

& NNTPP were requested to submit the data urgently.

(c) Monthly Review of LGBR for the next 5 months (Availability &

Requirement) : The Availability & Requirement in respect of the State

System are reviewed every month for the next 5 months. Constituents

were requested to submit this data every month by 3rd

of the month.

Constituents were also requested to furnish the detailed Availability &

Requirement for the period from October, 2020 to February, 2021.

6.6 Preparation of Outage Deviation Report :

(a) Outage Deviation Report : In earlier OCC meetings, SRPC pointed

out with concern that some of the Constituents and Entities have

dropped submitting OCC data for outage deviation report. The

Constituents were requested to furnish the said data in the

prescribed format mailed to the OCC Google Group on 26.06.2020.

The States / Generators / Transmission Agencies were requested to

furnish the data for the Outage deviation Report along with OCC

data every month, without fail.


6.7 Updating Monthly Progress Report with the ongoing projects of Generators, Transmission Lines & Elements and Sub-Stations :

a. In the earlier OCC meetings, the Constituents / Entities were requested

to furnish the said data in the prescribed format. This format was

mailed to the OCC Google Group on 26.06.2020.

b. It was appreciated in the meeting that APTRANSCO and APGENCO

have started submitting the data in the prescribed format.

c. TSTRANSCO was also appreciated for switching over to the prescribed

format. However, 220 kV, 400 kV report were submitted in separate soft

files. It was requested to submit in the single soft file.

d. The Progress Report from PGCIL, KPTCL and TANTRANSCO are

being received in the prescribed format only for many years and the same

was highly appreciated in the meeting. However, TANTRANSCO was

requested to submit the data which are pending after March, 2020.

e. The progress data in respect of KSEBL are not received. KSEBL was

requested to submit the same in the prescribed format every month along

with OCC data.

f. The status of data received from the States / Transnission Entities are as

follows :

States /

Transmission

Entities

Progress of

Generation Schemes

for 2020-21 and

beyond 2020-21

Progress of

Transmission

Schemes for 2020-

21 and beyond 2020-21

Andhra Pradesh

Submitted by

APGENCO for

August, 2020 for few

Schemes.

Submitted without

proper update and

not in format. 220

kV SS, Lines are not covered

Karnataka Not submitted Submitted in format

Kerala Not submitted Not submitted

Tamil Nadu

Not submitted Submitted in format

up to March, 2020 only

Telangana Not submitted Submitted but not

in format

U.T of Puducherry Not submitted Not submitted

PGCIL SR 1 -- Received in format

PGCIL SR 2 -- Received in format


6.8 Pending data from APTRANSCO for SRPC Annual Report 2019-20 :

The data for the preparation of Annual Report of SRPC for the year 2019-

20 were to be submitted by 22-05-2020. However the data in respect of AP

system were not received and they were requested to submit the data

urgently.

6.9 Shut down of Pole-1 of 800 kV Raigarh - Pugalur HVDC for Pole-3 for construction works :

(a) SR II PGCIL vide letter dated 08.10.2020 (Copy enclosed as Annexure

No. 6.9. A), had requested for shut down of Pole I for Pole – III works

(from 08:00 hours of 20.10.2020 to 18:00 hours of 22.10.2020) and shut

down of 400 kV Bus -2B of 765/400 kV Raigarh S/S (08:00 hours of

19.10.2020 to 12:00 hours of 19.10.2020)

(b) In the meeting, SRLDC was requested to pursue with NLDC / WRLDC

/ PGCIL in connection with the precautionary measures / system

constraints to be taken care of during the above shut down for the Pole 3

construction works.

7 Availability and Requirement

a) The Availability & Requirement in respect of the State System were reviewed

for the next 5 months. Constituents were requested to submit this data every

month by 3rd

of the month.

b) The detailed Availability & Requirement for the period from October, 2020 to

February 2021 has been attached as Annexure -7A

8 REVIEW OF THE POWER SUPPLY POSITION

8.1 Grid Highlights for September 2020(Annexure-8.1.A)

9 Frequency

9.1 High Frequency

i) It was noted that the Regional Grid had operated above IEGC range i.e.50.05

Hz for 20.61 %of the time. It was also noted that the frequency on some of the


days was higher for considerable duration of times. (Refer Table-IV of

Appendix)

ii) SRLDC informed that maximum frequency had touched 50.19 Hz at 06:04

hours of 06.09.2020 (Graph at Annexure-9.1.A). Also the duration of time Grid

operated above IEGC limit is observed to be high which is to be looked into

seriously.

iii) SRLDC presented the underdrawal of states when frequency was above 50.05

Hz. (Annexure-9.1.B). The maximum underdrawals touched by States during

September 2020 also was presented.

iv) Constituents were advised to avoid under drawal at high frequencies. SRPC

requested all the constituents that action needs be taken to adhere to the schedule

since it has commercial/operational impacts even for under drawal.

9.2 Pump mode operation

It was noted that there was no consumption in pump mode at N’Sagar &

Srisailam. Kadamparai consumption in pump mode was 11.95 MU during

the month of September 2020.

9.3 Low Frequency

A. Sustained low frequency & OD/UI incidents were to be discussed. SRLDC has

been requested to communicate specific incidents to states which may be

discussed.

B. In the Meeting, it was noted that the frequency of grid operation was at times

lower than IEGC range. Grid had operated below IEGC range i.e. 49.90 Hz for

4.57 % of time during the month (Refer Table-VI of Appendix).

C. SRLDC informed that minimum frequency touched 49.69 Hz at 09:10 hrs on

24.09.2020. Drawals of Southern Regional states at that instance were also

projected (Graph at Annexure-9.3.A).

D. Overdrawal by SR constituents at frequency less than 49.90 Hz (Annexure-

9.3.B) was presented by SRLDC. The maximum over-drawals touched by

States also was presented.

E. MS, SRPC had requested SRLDC to analyze how much SR is contributing to

dip or hike in frequency.


F. SRLDC had informed that on case to case basis all the states are partially

contributing for the dip and hike in frequency. ED SRLDC had informed that

from next month analysis SCED portion would be excluded.

10 VOLTAGE PROFILE

10.1. Low voltage

a) Details of capacitors installed during September 2020 is at Annexure-10.1.A

b) SRPC vide letter dated 29.06.2020 enclosing capacitor status report as on

30.04.2020 had requested all the states to verify the report and furnish the

vetted data to SRPC. The capacitor requirement for 2020-21 as computed by

State Study Group and the status of faulty capacitors also may be furnished.

c) The following were noted in the Meeting

i) AP, KER and Puducherry are furnishing the updates in the Standard format.

(attached at Annexure-II of the above mentioned letter)

ii) TS is furnishing the monthly addition, but not in the prescribed format. It

is requested to TS to furnish the information in the Format from April 2020.

iii) TN has furnished the data till May 2020(in the prescribed format). TN is

requested to furnish the information in the prescribed format from June 2020

onwards.

iv) KPTCL has furnished the details till July 2020(not in prescribed format) in

which some discrepancies are observed which needs to be sorted out. SRPC

had already requested KPTCL to look into this issue. KPTCL is requested to

furnish the status as per format from April 2020 onwards.

attached at Annexure-II of the above mentioned letter.

10.2. High Voltage

10.2.1 High Voltage at UPCL

Deliberations /Updates

a) UPCL had informed that high voltage issues are still persisting. Both bus

reactors at UPCL reached at site and erection and commissioning may take

another two months. Connection of Reactor at Hebbanhalli to 400 kV UPCL

Hassan line is requested and being follow up since more than a year. As the

station is ready, SRPC is requested to take up the matter with KPTCL to

expedite the Habbanhalli reactor to UPCL –Hasan line.


b) KPTCL informed that LC is requested for UPCL-Hassan line for

constructing intermediate tower construction and once the construction is

completed, Hebbanahalli S/s (Yettinahole LIP) and one more 220 kV S/S at

Hebbanahalli (under construction) would come up by December 2020.

10.2.2 High Voltages at Pavagada

a) As per the meeting held by SRPC/SRLDC with KSPDCL and SPDs of

Pavagada Solar Park on 02.07.2020, it was instructed to set the Inverters in

constant Voltage mode to overcome over voltage problems in Pavagada

Solar Park.

b) After deliberations in the 169th OCC Meeting, KSPDCL was suggested to

follow up with SPDs for necessary compliance.


i) KSPDCL informed that there was no major tripping due to over voltage.

Off load voltages observed is 239 kV at 220 kV side, 70 kV at 66 kV side

and 34 kV at the 33 kV side.

ii) Some SPDs have expressed their inability to put the machines on constant

mode since manual intervention is required to switch off/on the MCCB.

Studies are being carrying out by SPDs and study report is expected by this

month end.

iii) SGM, SRLDC informed that many tripping on over voltage had been

observed and instructions were also given to address/solve these issue with

action to be taken.

iv) SE(O), SRPC opined that as per Regulation it is being asked.

v) KPTCL also expressed concern regarding the high voltage tripping which

badly affecting KPTCL grid operation.

vi) SRLDC/SRPC requested KSPDCL to take up the issue on priority to

comply with IEGC provisions.

10.2.3 MVAR Interchange

In the 169th

OCC Meeting it was felt that MVAR testing may be taken up

after the Corona pandemic issues settle down.

A. SRLDC/SLDCs are requested to present the MVAR interchange of

generators in their control area.

10.2.4 RE Generators for Reactive Compensation & High

Voltage


a) All the states were again requested to kindly examine and ensure voltage

based MVAR interchange for RE generators.

b) The following was noted in the Meeting:

i) KPTCL- A Meeting had been held at Cauvery Bhavan. KERC had raised

some queries and KEGC review panel had discussed the queries. Reply is

prepared and study results by RT wing had been submitted. Similar study

report was sought for Wind also which is under progress. KERC may

consider the same in final Grid Code.

ii) KSEBL: Final Grid Code would be notified shortly by KERC.

iii) TSTRANSCO: The charges are yet to be notified by TSERC. TSERC had

started functioning.


It was decided that this issue will be further deliberated in thes

state specific High Voltage/ Reactive Power Management meeting.

10.2.6 MVAR interchange with ISTS

a) SRPC had analyzed the nodes of high voltage coupled with MVAR

injection during February 2019 to August 2020and the following was

observed:

Entity 400kV Nodes with MVAR injection during V > 103%

Andhra

Pradesh

Cuddapah, Chittoor, Sattenapalli, Vemagiri, Hindupur,

Vijayawada, Kurnool, Gazuwaka, Maradam

Karnataka Nelamangala, Raichur, Hoody, Guttur

Tamil Nadu Tirunelveli, Karaikudi, Pugalur, Alamathy, Arasur, S V

Chatram, Kalavinthapattu

Telangana Maheshwaram, Dichipally, Warangal, Malkaram, Gajwel,

Mehaboobnagar, Khammam, Hyderabad, Shankarpalli

Puducherry Karaikal(230 kV)

In the Meeting it was decided that this issue will be further

deliberated in the state specific High Voltage/Reactive Power

management meeting.


10.2.7 Status review of Bus/ Line Reactors, Line Reactors and

STATCOM

Status of implementation of Bus / Line Reactors approved in the Standing

Committee/SRPC pending for commissioning by the SR constituents(Refer

table-II).

10.2.8 Reactor status

i. Hoody reactor: Relay testing, SAS integration completed, equipment testing

under progress. CEIG commissioning approval awaited. Likely to be

commissioned by 20.10.2020.

ii. KKNPP reactor: Shunt Reactor will be put back into service in Dec, 2020.

iii. KGS reactor: Tender would be open for both the reactors on 26.10.2020.

11 Network Protection/Security issues

11.1 U/F &df/dt Relays Schemes

11.2 Implementation of SRPC recommended quantum

a) It was noted that all States had implemented AUFR and df/dt schemes fully.

b) In the Meeting, SRLDC presented the load relief realized as a percentage of

AUFR quantum declared in the identified feeders during the month of

September 2020 as follows: (Detailed Presentation is at Annexure-11.2.A)

c) AP: 83 %, TS: 121 %, KAR: 50%, KER: 78%, TN: 73%, Pudu: 95% &SR:

75%.

d) SRLDC expressed concern regarding the less realization by KPTCL.

e) KPTCL informed that they will take up with SCADA wing and issues, if any,

would be addressed.

f) Status update of SCADA mapping of feeders of AUFR &df/dt schemes

State SCADA

mapped %

Status

AP 98 All the stages vetting completed.


TS 88 TSTRANSCO informed that additional RTUs at 132 kV level are required to achieve 100 %.

Project is taken under PSDF funding. Tendering

will be taken up very shortly.

TN 88 All the stages vetting completed.

Pudu 92 SRLDC informed that mapping has to be carried

out at Puducherry SCADA.

Puducherry informed that mapping is being

carried out. Will coordinate with SRLDC after

finishing the mapping for testing etc.

11.3 SPS schemes

11.3.1 Mock tests

A. The Mock Test for Raichur-Sholapur and KK2 SPSs would be carried after

verification of DS Matrix. A Meeting was convened to finalize the DS Matrix

on 10.09.2020. Finalized SPS DS matrix is at (Annexure-11.3.1.A)

B. In the Meeting it was noted that in the 170th OCC Meeting MS SRPC had

enquired about the mock test carried in State Sector SPS.CGM SRLDC had

informed that the practice of testing at State Level SPS was not in practice and

may be explored. States are requested to looked into it and revert back.

11.3.2 SPS for Talcher – Kolar HVDC Bipole

a) In compliance of Commission’s Order dated 26th

March 2018 in Petition No.

09/SM/2015, the list of SPS in SR had been communicated to all concerned.

SRLDC was to furnish the details of ISTS SPSs and SLDCs for other intra state

SPSs. This information is to be submitted along with OCC on monthly basis.

b) SRLDC had furnished the SPS operations for the month of September 2020

which is at Annexure-11.3.2.A.

c) HVDC Talcher - Kolar Pole –I tripped on 19th September 2020 at 05:04 hours.

. SPS trip signal-1 and trip signal-2 operated and load shedding details as

furnished by respective states is given below:

T-K Trip

Signal_I

T-K Trip

Signal_II

designed

Actual

Load

relief

Action to be taken


designed Load

relief (in MW)

Load

relief (in

MW)

obtained

(in MW)

Andhra

Pradesh 230 240 40

AP informed that 40 MW relief may

be wrong. AP to update the status.

Karnataka

250

200

320

As discussed during the SPS DS

matrix finalisation meeting held on

10th September 2020, the shifting of

DTPC from 400kV

SomanahalliPowergrid control

room to 66kV KIOSK of 220kV

Somanahalli switchyard is yet to be

taken up by M/s. Powergrid. All the

other necessary wiring work has

been completed by KPTCL. The

designed load relief can be achieved

once the above work is completed.

KPTCLto update the status.

Tamil Nadu

356

220

300

TK I signal received at all the points.

TK II signal not received at

Madurai, Pasumalai, and

Kurugurapilli S/Ss. PGCIL to

update the status .

Kerala -

170 120

Load at that time was only 70 %.

Total 836 830 780

11.4 SPS for Raigarh–Pugalur

A. All the states except UT of Puducherry have submitted the details.

B. TANTRANSCO vide their letter dated (Annexure-11.4.A) had furnished the

details of feeders, port no/DTPC location at which the SPS signal is required

along with rout diagram.

C. PGCIL vide E-mail dated 24.09.2020 (Annexure-11.4.B) have informed that

Raigarh-Pugalur SPS-1 signal has been taken into service w.e.f 16:00 hrs of

24.09.2020 vide NLDC Code 1150 and SRLDC code 2169.


11.5 Load relief details of 335 MW for Raigarh - Pugalur SPS in TSTRANSCO

a) TSTRANSCO had raised the issue of difficulty in identification of new loads

for HVDC Raigarh - Pugalur SPS.

b) In the 170th

OCC Meeting, TSTRANSCO had expressed the discrepancies

with SRLDC analysis and also expressed difficulties in identifying the loads

since huge quantum of loads had already identified for different

protection/SPS schemes. After deliberations it was suggested that the issue

would be discussed in a separate Meeting(VC).

c) In the Meeting it was noted that a meeting was convened on 23.09.2020

through WebexVC. MoM is available at SRPC website. TSTRANSCO had

furnished the details on 09.10.2020. The same will be analyzed in

coordination with SRLDC and may be discussed in the Next OCC Meeting.

11.6 SPS for Pugalur–Trichur

It was agreed that KSEBL will wire 80 MW at Madakkathara and 135 MW

at Palakkad identified for Udumalpet – Palakkad line SPS for Pugalur –

Trichur HVDC SPS.

11.7 RGMO/FGMO

a) As per 5th Amendment to IEGC, gas stations above 50 MW Installed Capacity

were also to come under RGMO/FGMO Operation w.e.f. 1st October 2017.

b) Inadequate response was needed to be taken up by SLDCs with respective

SERC’s in line with Hon’ble CERC Orders in respect of Petition No.

84/MP/2015 and 302/MP/2013.The non-performance of the generators under

SRLDC control would be taken up by SRLDC with the respective generators.

c) In the Meeting SRLDC informed that the final RGMO response from May

2020 to August 2020 incorporating all the observations had been furnished

which is at Annexure-11.7.A


12 Automatic Demand Side Management Scheme

(Petition No. 250/MP/2012) & GSES (Petition No.

265/MP/2012) a) It was noted that all states had implemented revised ADMS logic. (Alarm at

49.90 Hz and below for 10 minutes, Trip at 49.85 Hz, Min DSM limit for 15

Minutes).

b) ADMS feeders may also be mapped, for enhanced visualization and analysis of

ADMS operation.

c) All states were requested to identify additional feeders which could be tripped

through SCADA rotationally with load relief of (OD-Max dev limit). Any loads

tripped under ADMS should be brought back only under the directions of SLDC

keeping in view the frequency, overdrawal etc.

d) SRLDC vide E-mail dated 05.10.2020 (Annexure-12.A) had furnished the

ADMS operations during September 2020. It was noted that there was tree

incidences w.r.t KPTCL(3rd

, 24th

& 28th ), 1 incidence w.r.t AP (on 8

th), 1

incidence w.r.t TN9on 3rd

), 3 incidences w.r.t AP (on 8th

(2), 19th

) and one

incidence w.r.t TS(on 19th

)


i) SRLDC expressed concern that ADMS operation was not observed from

SCADA drawal in most of the incidences.

ii) KPTCL informed that on 3rd

Sep, the error in ADMS program was rectified.

On 24th , 349.58 MW load relief was obtained &on 28

th ,249.87 MW load relief

was obtained.

iii) It was noted that the States could support the ADMS relief (feeder tripping)

through SoE. Incidence can be validated accordingly.

iv) All the states are requested revert back on the non tripping of ADMS for the

incidents in September 2020.


13 Grouping of loads (IEGC clause 5.4.2 (e)) Regulations in respect of Grouping of loads to be complied by all the

concerned utilities.

14 LVRT Implementation a) Status review of Pending points as discussed in 4

th RE/LVRT meeting

b) Quarterly reports of the SR constituents jointly validated by SRLDC/SRPC

Secretariat are being communicated to Hon’ble CERC in respect of the

installation and performance of LVRT installed on existing WTGs as per the

directives of Hon’ble CERC.


i) SRPC requested all the SLDCs to furnish the LVRT status(33 kV & above) for

the WTGs being commissioned w.e.f. 06.08.2019.

ii) AP, TN & KER are requested to furnish the WTG details as per the standard

format (WTGs which was installed before April 2014 and after April 2014 and

status of LVRT implemented).

15 Emergency Restoration System (ERS) Deliberations /Updates

i) AP: 3rd

ERS is under progress.

ii) TS: Tender is extended till 23.06.2020.

iii) KER: Retendering is under progress.

iv) TN: Tender opened, not considered due to high cost. Retendering is under

process

16 SCADA AND COMMUNICATION The following SCADA/Communication issues were to be brought to the notice

of the forum.

a) KGS Issue: KGS vide E-mail dated 18.09.2020(Annexure-16.A) had informed

regarding the non-working of PLCC in KGS 1 to 4. It is a long pending issue

and the following are the deficiencies.

i. PLCC for GUTTUR a. Carrier fail Window Annunciations is there continuously.


b. LED indication on Channel -2 failure is glowing continuously.

c. There is no speech communication.

ii. PLCC for Kadra and Kodasalli a. Carrier fail Window Annunciations is there continuously.

b. There is no speech communication.

iii. Also there is only one charger and there is no stand by. KPTCL help is required for connection and synchronization of 1 No standby charger which is kept ready for connection at the location.

iv. It is requested that team of M/s KPTCL may please be deputed at the earliest to check this problem and communicate on above and send the details of officials coming to KGS KAIGA for attending above problem so as to make gate pass.

v. In the Meeting, SRLDC informed that the issue had been solved.

b) SEIL issue

SR I informed that the works will be taken up in November 2020. Shut down

of line is required and in consultation with SEIL works would be planned. Two

days shutdown will be required for rectification works.

c) Mytrah issue

SRLDC informed that SCADA points were yet to be integrated for Phase – III

of Mytrah.

d) NTECL Issues

i) OPGW cable laying and completion status of Vallur- Kalavathapattu lines (

redundant Path communication) for AGC implementation.

PGCIL had informed that the works are pending. At present

people are working at KSEB side and after completing that work

this will be carried out.

ii) NTECL Vallur - Alamathy Line-1 channel PLCC communication failure

remain unattended more than two year.

NTECL stated that for checking at Almathi side, no officials were

available. NTECL and PGCIL would coordinate mutually to solve

the issue. .

iii) SEMs meter replacement with new GPS synchronized meter at NTECL

Vallur as time drift is gradually increasing.

PGCIL informed that the details from field were awaited.


17 REMC Project in SR SLDCs Deliberations /Updates

a) KPTCL had furnished the issues in respect of FSPs.

b) APTRANSCO, TANTRANSCO & SRLDC were requested to furnish the

issues in respect of FSPs after discussing with REMC wings.

c) A separate meeting with SLDCs/SRLDC and REMC FSPs would be convened.

18 Periodical Audit and Vulnerability Assessment &

Penetration Testing (VAPT) of Infrastructure

a) CISO MoP vide letter dated 31.01.2019, 20.02.2019, 22.04.2019 and

29.05.2019 had requested all stake holders to carry out Cyber Security Audit

and VAPT of ICT Infrastructure, website, web application etc in defined

intervals by CERT-IN empanelled cyber security audit agencies to avoid

vulnerability and report to CISO MoP along with the key findings of the audit.

The above details may kindly be sent to [email protected] with a copy to

[email protected].

b) All the entities are requested to complete the periodical audit and VAPT

of ICT infrastructure for the year 2020-21.

c) In the 169th

OCC Meeting w.r.t. TSTRANSCO letter dated 04.08.2020,

SRLDC had informed that he will discuss with IT wing and revert back. SRPC

stated that a workshop in this regard would be convened in consultation with

SRLDC. MS SRPC had informed that the issue would be referred to CE(IT),

CEA and CISO, MoP. Subsequently issue was taken up with Sectoral CERTs

vide letter dated 10.08.2020.

d) Identification of Critical Information Infrastructure(CII) in respect of Stake

holders under the purview of SRPC:

i) SRPC vide letter dated 22.07.2020 had taken up the issue with CERT-Hy, CERT-

Th, CERT-Trans, CERT-Distribution

ii) CISO(Distribution) vide E-mail dated 22.07.2020 had informed that as far as the

Distribution sector is concerned, it may please be noted that information on the

status of cyber security measures taken by various DISCOMs including their

updated CISO details & CII details is being furnished to MoP and NCIIPC by

CERT-D on regular basis.




iii) Reply from other CERTs is awaited.

A. OCC noted the above.

19 Communication Audit

a) For Annual Audit for FY 2020-2021 all entities to maintain the data/information

systematically.

b) Due to Covid -19 pandemic, SRPC is unable to Audit the Sub-Stations.

Therefore, as discussed in the COM SR October 2020 meeting held on

17.09.2020, a list of Sub-Stations comprising 2 from each Entities were selected

for Audit. SRPC vide letter dated 18.09.2020, had requested that the Nodal

Officers may kindly arrange to conduct the audit in respect of their Sub-Stations

listed in the Annexure of the said letter, fill the Audit Format attached , which

is also available in the SRPC Website http://www.srpc.kar.nic.in under

Communication / Other Documents and submit to SRPC e-mail

([email protected]) by 30.11.2020.

c) PED, Puduchery submitted the report in the format. TANTRANSCO informed

that they were preparing the same.

d) APTRANSCO, KPTCL, KSEBL, TANTRANSCO, TSTRANSCO, PGCIL

SR 1 & SR 2 were requested to conduct Communication Audit and submit

the Audit report at the earliest.

20 VC Facility at SLDC In the Meeting, Puducherry ED informed that VC facility would be commissioned

by March 2021.

21 Compliance of CEA Regulations for Grid connectivity

of Renewable Energy Sources

a) The following is the updated status on RE SCADA availability as noted in the

171st Meeting of OCC:

State SCADA availability as on 30.09.2020

Mapped Vs I/C

Remarks

AP Wind: 4079.37/3991.64MW (97.85%)

Solar: 3470.99/3227.1 MW (92.97%)

Total: 7550.36/7218.74 MW (95.61)

Pending SCADA availability

was for RE connected

distribution level and for

http://www.srpc.kar.nic.in/


which action had been taken

for compliance.

TS Wind: 100.8/100.8 MW (100%)

Solar: 3494.47/3473.86 MW (99.41%)

Total: 3595.271/3574.66 MW (99.43%)

Action for balance SCADA

availability at 33 kV and

below was being followed up

and notices had been issued.

KA Wind: 4813.65/4793.85 MW (99.59%)

Solar: 7072.70/6365.70MW (90%)

Total: 11886.35/11159.55 MW (93.89%)

KE Wind: 70.28/27.0 MW (38.42%)

Solar: 95.20/87.20 MW (91.60%)

Total: 165.47/114.20 MW (69.01%)

TN Wind: 9195.78/8768.13 MW (95.35%)

Solar: 3836.58/648 MW (16.89%)

Total: 13032.36/9416.13 MW (72.25%)

SR Wind: 18259.88/17681.4 MW (96.83%)

Solar: 17969.94/13801.86 MW (76.81%)

Total: 36229.82/31483.28MW (86.90%)

22 Black Start Procedure a) Point to point mock exercise for black start to be carried out by all constituents.

b) Details of Mock drills conducted in September2020 were to be furnished.

c) Mock drills scheduled for October 2020 and from November 2020 to December

2020 were to be furnished.

d) SRLDC informed that the workshop dates would be finalized and

communicated.

e) SE(O), SRPC requested all concerned to furnish the mock test reports in regular

manner in the specified Format.

23 Wind/solar Generation

SRLDC presented the day-wise Wind Generation pattern in Andhra Pradesh,

Karnataka & Tamil Nadu (Annexure-23A) & day-wise Solar Generation

pattern in Andhra Pradesh, Telangana, Karnataka& Tamil Nadu during the

period 1st September 2020 to 30

th September 2020 (Annexure-23B).


State Max(MU) Day Min(MU) Day

WIND

Andhra Pradesh 41.97 21.09.2020 4.72 03.09.2020

Karnataka 49.65 23.09.2020 3.96 03.09.2020

Tamil Nadu 96.59 19.09.2020 6.16 02.09.2020

SOLAR

Andhra Pradesh 15.64 06.09.2020 3.71 26.09.2020

Telangana 21.08 06.09.2020 5.77 26.09.2020

Karnataka 27.86 06.09.2020 8.82 26.09.2020

Tamil Nadu 20.04 23.09.2020 7.3 02.09.2020

24 Any other issues with the permission of the Chair

MS, SRPC congratulated Shri Asit Singh, SE(O), SRPC on his promotion to Chief

Engineer and informed the forum that he would be joining Polavaram Project

Authority at Hyderabad. MS thanked him for his excellent contribution and

valuable services to SRPC in operation division and called him as an outstanding

power engineer. He was felicitated and given ovation by all the members of the

OCC forum thanking him for his services and wishing him success in his new

assignment. MS informed that Mr. R M Rangarajan, SE(Protection) was given the

additional charge of SE (Operation).

25 Vote of Thanks

Member Secretary, SRPC thanked all the participants for their valuable inputs

during the deliberations in the Meeting. Actionable points will be posted and

requested all to go through the same and take adequate actions. Category-wise

consumption/load details may be submitted in time without fail.

37th TCC Meeting of SRPC is scheduled on 28.10.2020 through WebexVC. He

requested all to furnish the agenda items if any, at the earliest. Many training

programs on various power system subjects are being conducted regularly by

PSTI, Bangalore & HLTC at Somanahalli which are Govt. of India organizations

under NPTI. He requested all to make use of these institutes, which is cost

effective also. He requested all SLDCs/GENCOs/Generators to come up with

firm proposal w.r.t outage planning of the Generating Stations. For ensuring

electrical safety & quality of work, he stressed that qualified

contractors/supervisors, who are authorized by State Electrical Licensing Board,

should be engaged in O&M work of the plants, substations and lines. He

requested the members to avoid unwanted trippings of electrical equipment


during maintenance. He informed that CEA’s electrical safety regulations, 2010

specifies syllabus for various training requirements of engineers, supervisors and

technicians engaged in O&M of power plants, transmission and distribution

systems. The training can be either at their own training institutes or recognized

institutes such as NPTI, PSTI etc. For fruitful discussions/and conclusion in the

Meeting, he requested all participants to go through the agenda and attend

meeting well prepared. He thanked all the SR constituents for the cooperation

extended to smooth grid operation.

26 Date & Venue of the next Meeting

The 172nd

OCC Meeting would be held trough VC (Web meeting) at 10:00 hrs

of 11.11.2020 (Wednesday).

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