SOUTHERN REGIONAL POWER COMMITTEE … AGM, NTPC expressed concern that on 30th April 2013, 220 KV Kayamkulam-Edamon line was taken out from Edamon end without any information whatsoever

SOUTHERN REGIONAL POWER COMMITTEE BANGALORE

MINUTES OF THE 83rd MEETING OF THE OPERATION COORDINATION COMMITTEE OF SRPC HELD AT BANGALORE ON 10TH MAY 2013

1. INTRODUCTION

1.1 The 83rd Meeting of the Operation Coordination Committee was held at Bangalore on

10th May 2013. The list of Participants is given at Annexure-I.

1.2 Shri S.R. Bhat, Member Secretary I/c, SRPC welcomed the Members & other

participants to the 83rd OCC Meeting. He informed that SRPC/TCC meeting was

scheduled to be held in next week, issues needed to be deliberated/finalized in this

meeting. He added that the low generation level at Talcher St-II was a matter of

concern. Two units at Talcher St-II had been taken out due to shortage of coal. He

informed that a meeting with MCL regarding coal supply issues had been conducted

on 12th April 2013 at Hyderabad. MCL had also been requested to attend the SRPC

meeting scheduled for 18th May 2013. He informed that KPCL had submitted the

format for Certificate of healthiness of various protection/defense mechanisms, which

could be deliberated in the meeting. He informed that MAPS, Kalpakkam had

requested the Generators in the region to consider lending a spare Generator

Transformer (GT) for their immediate requirement. The GT of MAPS Unit 2 had

recently been damaged. He informed that the availability of Ramagundam I,II & III and

Neyveli TS I Exp was more than 100 % during April 2013, which deserved due

appreciation. He mentioned that POWERGRID had submitted an agenda item with

regard to pollution mapping. He also mentioned about the recent letter received from

CEA in respect of physical and cyber security.

1.3 MS I/c, SRPC requested Shri Asit Singh, Superintending Engineer to take up the

agenda for the discussions and accordingly the same was taken up.

2. CONFIRMATION OF THE MINUTES OF THE 82nd MEETING OF OCC OF SRPC HELD ON 10th APRIL2013 The Minutes of the 82nd OCC Meeting were confirmed since no amendments were

sought.

Minutes of the 83rd OCC Meeting of SRPC held on 10th May 2013

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3. MONTHLY OUTAGE PLAN

3.1 ISGS/CGS: Generating Units The following outages of generating units were approved:

Station Name Station

Capacity From To No. of days

NTPC Ramagundam STPS Unit 4 500 20-Jun-13 24-Jul-13 35 Kayamkulam RGCCPP GT I 115 30-May-13 6-Jun-13 8 NLC NLC TS I Unit 2 50 1-Jun-13 21-Jun-13 21 NLC TS I Unit 3 50 22-Jun-13 5-Aug-13 45 NLC TS I Unit 1 50 12-Jun-13 2-Jul-13 21

Note: The planned outage of Vallur Unit-I was deferred for this financial year by NTECL

Vallur. OCC suggested that the TG test should be scheduled before November 2013 and plan the normal shut down between Jan-May 2014.

3.2 ISTS/State Sector Transmission Elements 3.2.1 The outage proposals for the month of May and June 2013 of Central and State

Transmission elements were discussed and outage dates were approved. The

same was hosted on the same day in the SRPC website (http://www.srpc.kar.

nic.in/ website/2013/operation/plout10-05-13.pdf).

3.2.2 SE (O), SRPC apprised about the planned maintenance which was scheduled in

the Annual Outage Transmission Planning during the months of April and May, but

were not taken up. It was also pointed out that outages which had been planned

subsequently had been taken up / proposed in the month of April, May and June.

3.2.3 DGM, SR-II, PGCIL replied that the dates proposed for AOTP were tentative dates

while the outages were planned as per requirements.

3.2.4 ED, SRLDC said that the AOTP should be prepared with due care. As such, there

should not be much deviation from the AOTP date, except in the event of

emergency.

3.2.5 DGM, SR-II, PGCIL said that the emergency outages did not arise on account of

not adhering to AOTP but were emergent in nature. He added that AOTP should

be followed for all Transmission elements, whether in the state sector or under

CTU.

3.2.6 MS I/c, SRPC pointed out that the outage planning for generators and

transmission elements should be carried out with due diligence. Generally there


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should be minimal deviation except in the event of any emergency shut down or

approved deferment due to precarious Grid/system conditions. Deviation was

being monitored by higher bodies and assumed significance especially after the

recent Grid Disturbances in NEW Grid. Periodic report was also being submitted to

Hon’ble CERC.

3.2.7 The matter regarding the elements to be covered under AOTP was deliberated.

After discussions, it was agreed that the following elements would be included for

deliberations for approval in the OCC:

All Transmission Lines/ICTs/Bus Reactors/ Line Reactors/HVDC Lines/HVDC Stations/Series Compensators of POWERGRID

All 400 kV Lines / ICTs/Bus Reactors/Line Reactors of STU.

All inter-state lines

All evacuation lines of ISG stations.

Any critical element which SRLDC deems appropriate to be approved through OCC.

3.2.8 After deliberations it was also agreed that the AOTP for other major Transmission

elements of the STU would be furnished separately, for information purposes.

Instances of smaller shut downs of breakers/buses etc. would also be informed to

SRLDC separately since system would be operating with reduced reliability.

3.2.9 AGM, NTPC expressed concern that on 30th April 2013, 220 KV Kayamkulam-

Edamon line was taken out from Edamon end without any information whatsoever

to NTPC Kayamkulam . On the same day 220 KV Kayamkulam –Pallom line was

under OPGW works on hotline. DCE, KSEB said that he would revert back with the

details in this regard.

4. OPERATION OF THE GRID IN MAY AND JUNE 2013

4.1 The Table below furnishes the anticipated availability as given in the 82nd OCC

against the actual availability for the month of April 2013:

(Figures in MU)

State Actuals furnished by States for 83rd

OCC

Anticipated availability as furnished by States in

82nd OCC Variation

Andhra Pradesh 247.03 236.21 8.12 Karnataka 164.62 185.9 -21.28 Kerala 58.88 50.64 8.24 Tamil Nadu 223.14 213.19 9.95


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In respect of the variation of -21.28% between the actual and the anticipated figures,

KPTCL apprised that it was on account of less generation in thermal stations due to

the shortage of coal.

4.2 Anticipated availability and consumption for the months of May 2013 & June

2013 4.2.1 The anticipated availability and consumption as furnished by the states for the next

two months – May 2013 and June 2013 are furnished below.

May 2013 (EX-Bus Figures in MU) STATE AP KAR KER TN SR THERMAL GENERATION 101.85 44.13 57.56 203.54 DIESEL AND GAS 3.36 0.48 2.50 7.26 13.60 HYDRO GENERATION 7.85 22.45 12.32 7.19 49.81 CGS DRAWALS 46.85 32.00 24.19 64.16 167.21 Simhadri TPS 23.50 23.50 ER/NR 4.92 0.00 4.92 Addl. CGS Drawals 0.00 IMPORTS & PURCHASES FROM IPPs etc 14.61 30.00 8.00 75.34 127.95

Proposed Purchase 35.53 30.00 10.50 76.03

TOTAL AVAILABILITY 238.47 159.06 57.52 211.51 666.56

ANTICIPATED REQUIREMENT 291.64 164.00 65.29 255.30 776.23

DEFICIT / DAY -53.17 -7.77 -43.79 -109.67 Restriction & Control Measures 53.17 7.77 25.00 85.94

June 2013 (EX-Bus Figures in MU)

STATE AP KAR KER TN SR

MONTH Jun-13 1st to

15th June

16th to 30th

June Jun-13 Jun-13

1st to 15th

June

16th to 30th

June THERMAL GENERATION 95.60 40.00 45.00 46.05 181.65 186.65 DIESEL AND GAS 3.36 0.60 0.60 2.50 7.26 13.72 13.72 HYDRO GENERATION 6.97 15.47 22.13 13.00 7.59 43.03 49.69 CGS DRAWALS 47.04 35.00 37.00 22.50 61.57 166.11 168.11 Simhadri TPS 23.50 23.50 23.50 ER/NR 1.03 4.07 5.10 5.10 Addl. CGS Drawals 0.00 0.00

IMPORTS & PURCHASES FROM IPPs etc 15.57 30.00 45.00 8.00 117.99 171.56 186.56

Proposed Purchase 36.27 30.00 0.00 10.00 76.27 46.27


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TOTAL AVAILABILITY 229.34 151.07 149.73 60.07 240.47 680.94 679.61

ANTICIPATED REQUIREMENT 274.40 163.00 163.00 61.90 272.81 772.11 772.11

DEFICIT / DAY -45.06 -11.93 -13.27 -1.83 -32.35 -91.17 -92.51

Restriction & Control Measures 45.06 13.27 1.83 25.90 72.79 86.06

4.2.2 In this context, DGM(OS) SRLDC suggested that while furnishing the Availability

and Requirement by the states, the imports/purchases figures should be

considered taking into due account the Inter-Regional ATC/TTC, Intra-State

ATC/TTC, S1-S2 flow gate ATC/TTC margins etc which would be more realistic

in nature.

4.2.3 The constituents agreed to initiate requisite measures to maintain appropriate load

generation balance in their systems, and adhere to the IEGC provisions.

5. REVIEW OF THE POWER SUPPLY POSITION

5.1 Grid Highlights

Frequency remained within IEGC range (49.7-50.2Hz) for 86.10% of time (March 2013 – 86.95%, April 2012 – 91.27%[49.5-50.2 Hz]).

Frequency remained below 49.7 Hz for 12.00% of time and average frequency for the month was 49.84 Hz.

Frequency remained above 50.2 Hz for 1.91% of time. SR Demand touched all time high, 33,377 MW on 16.04.2013

SR Daily consumption touched all time high, 745.33 MU on 16.04.2013

TN met a demand of 11641 MW on 20.04.2013 which was maximum till date.

Puducherry met a demand of 321 MW on 25.04.2013 which was maximum till date.

Andhra Pradesh, Karnataka, Kerala & Tamil Nadu had imported 53 MU, 520 MU, 104 MU & 473 MU respectively inter-regionally through bilateral exchanges.

Utilities located in Andhra Pradesh, Karnataka, Kerala & Tamil Nadu imported 311 MU, 0.22 MU, 40 MU & 150 MU respectively through Power Exchange.

Utilities located in Andhra Pradesh, Karnataka & Lanco exported 81MU, 417 MU & 8 MU respectively through Power Exchange.

Andhra Pradesh & Kerala had imported 217 MU & 142 MU intra-regionally.


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Karnataka IPPs had exported 390 MU intra-regionally.

M E P L declared COD of Unit # 2 (150 MW) on 30-04-2013

400 kV VTS to Malkaram ckt 2 of 260.80 ckm was commissioned by APTRANSCO on 01st April 2013.

Existing 230 kV SC line on SC towers with Kundah conductor was converted into 230 kV DC line with Zebra conductor from Loc. 12-89 of 230 kV Thudiyalur-Othakalmandapam line for Coimbatore Sub station. and commissioned on 20.04.2013.

MoP vide letter No. 3/3/2013-OM dated 23rd April 2013 had allocated 45 MW and 40 MW respectively to Andhra Pradesh and Kerala from Indira Gandhi STPS (1500 MW), Jhajjar w.e.f. 0000 hrs of 26th April 2013.

5.2 LGBR forecasted figures vs. actual figures It was noted that the variations between actual and forecasted availability/

requirements LGBR figures were less than 10% in respect of all the States except in

respect of the following cases:

Forecasted Actual Deviation from Actual

% Variation Reason

Karnataka

Energy Availability (MU) 5593 4903 -690 -12% Purchases effected due to corridor constraints

Kerala

Energy Availability (MU) 1440 1803 363 +25% Higher Purchases

Demand Availability (MW) 2509 3053 544 +22%

Tamil Nadu

Energy Availability (MU) 4798 6769 1971 +41% Infirm power from MTPS, NCTPS new units and Purchases (600MUs)

Demand Availability (MW) 7337 11388 4051 +55%

5.3 MoP targets vs. actuals

It was noted that MoP monthly generation targets for the month of April 2013 in

respect of hydro generation & thermal generation had not been met in Karnataka.

Hydro generation target for Kerala had not been met. Tamil Nadu was lagging in hydro

targets. In respect of CGS generation, target had not been achieved by Talcher Stage-

II and MAPS, Kalpakkam.

5.4 Demand / Energy

5.4.1 The Table below furnishes the details of actual Maximum Demand met (MW) &

Average Energy Consumption per day (MU) in respect of the SR constituents for


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April 2013 vis-à-vis April 2012. The maximum daily consumption by the

respective constituents during April 2013 is also included.

System

Actual Maximum Demand (MW)

Average Consumption/day (MU)

Max. Daily Consumption during April 2013 (MU)

April 2013

April 2012 %-age April

2013 April 2012 %-age

Andhra Pradesh 11867 11798 +0.58 256.71 255.00 0.67 266.06

Karnataka 8299 8449 -1.78 169.04 164.00 +3.07 177.20

Kerala 3065 3071 -0.20 59.08 56.00 +5.49 61.96

Tamil Nadu 11641 10078 +15.51 229.71 197.00 +16.61 244.53

Puducherry 321 311 +3.12 6.88 6.36 +8.15 6.86

Southern Region 33377 31936 +4.51 721.41 678.03 +6.40 745.33

5.4.2 It could be seen from the above that the Peak Demand for Tamil Nadu had recorded

a positive growth rate of 15.51% as compared to April 2012. Southern Region as a

whole had met maximum demand of 33,377 in April 2013, which was 1,441 MW

more than last year’s figure of 31,936 MW. In terms of average daily energy

consumption Tamil Nadu registered a positive growth rate 16.61 %. Southern Region

had registered a growth rate of 4.5% in respect of Maximum Demand & 6.4 % in

respect of average daily energy consumption.

5.4.3 It was observed from the SR Load Duration Curve for April 2013 (Annexure-V A) that the loads had generally increased compared to April 2012 & March 2013. Daily

consumption figures were also presented.

5.5 Hydel Availability

5.5.1 The energy availability in major hydel reservoirs at the end of April 2013 vis-à-vis

that for April 2012 was reviewed, which is detailed below: (Figures in MU)

System

Reservoir Energy at FRL

Storage as on Inflows in April 2013 30.04.13 30.04.12 Anticipated Actual

ANDHRA PRADESH Jalaput Srisailam (MDDL:243.8m) Nagarjunasagar (MDDL:149.3m)

495

269.8*

179.8*

226

829.98* -

252.16* -

158.56*

261

831.52* 14

242.91* 23

156.06*

12 2

18 0

KARNATAKA Linganamakki Supa

4547 3152

979 800

1191

557

20 24

22 26


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KERALA Idukki Kakki Total

2190

916 4131

324 164 738

531 314

1189

41 34

113

18 24 77

TAMIL NADU Nilgiris Total (Excluding Mettur)

1504 2183

271 343

395 521

46 82

35 56

*Levels in meters

5.5.2 DGM, SRLDC informed that the deficit was around 11% and 33 % as compared to

last year same day and 10 years corresponding monthly moving average.

6. MAJOR ISSUES

6.1 C-message issued to TN by SRLDC

6.1.1 TANTRANSCO vide letter dated 09.04.2013 (Annexure-VI A) had submitted that

certain Type C Messages had been issued to TN at frequency above 49.8 Hz from

02.01.2013 to 06.04.2013. They had also informed that on analysis of one minute

frequency-UI data, all the messages mentioned above were found to be sent when

frequency was above 49.8 Hz. Quoting IEGC 5.4.2(a) and 5.4.2(b) and also CERC

RoP dated 14.01.2013 in respect of Petition number No.249/MP/2012

TANTRANSCO had submitted that there were no Grid violations.

6.1.2 In the Meeting, EE, TANTRANSCO pointed that many messages being issued by

SRLDC were not in line with the IEGC regulations 6.4.7 and 5.4.2. Sl. No.9 of

CERC Order dated 14.01.2013 (vide petition No. 249/MP/2012) was also

highlighted

“We have considered the submissions of parties. With regard to the submission of NLDC that overdrawal irrespective of the frequency should not be allowed, we intend to clarify that at present, UI Regulations and Grid Code allow overdrawal within prescribed limits in normal situations and therefore, no such directions can be issued which would be contrary to the regulations.”

SRLDC was requested not to consider it as violation when the frequency was

equal to or above 49.8 Hz. TANTRANSCO further requested SRLDC to issue

messages other than A, B, C which were meant for grid violation.

6.1.3 DGM, SRLDC informed that in the order of Hon’ble CERC, it had been mentioned

‘in normal situations’. SR grid was not operating ‘in normal situations’ on account of

various reasons such as non-availability of all the applicable machines in RGMO,

desired relief not forthcoming through AUFR, high line loadings, poor voltage

profiles etc. Thus the system was in alert condition.


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6.1.4 DCE, KSEB endorsed the views of TN and added that 49.8 Hz to 50.2 Hz being

normal frequency range , system could not be deemed to be in alert stage always.

6.1.5 EE, KPTCL stated that Violation Messages should also be based on Frequency.

He was added that each violation message was being viewed seriously by the

Management.

6.1.6 ED, SRLDC said that in case the RGMO response shows improvement, desired

relief is observed in the feeders for UFR operation and voltage profile improved

SRLDC would reckon the system to be in normal condition from the alert state.

6.1.7 OCC suggested SRLDC may consider issuance of separate messages for

violations specifically not covered in IEGC and for violations stipulated in IEGC

Regulations. In past it was noted that Hon’ble CERC had imposed penalties for

specific IEGC Regulation violations. It was also felt that there was a need for

harmonization in issuance of messages for all the Regions. SRLDC was requested

to consult NLDC and revert back on this matter.

6.2 Coal shortage issues in SR and Low generation levels/shut down due to coal shortage at Talcher Stations

6.2.1 As suggested in the OCC forum, MS I/c, SRPC had addressed letter dated

10.04.2013 (enclosed as Annexure-VI B) to NTPC requesting to arrange

measures for increasing the generation level at Talcher Stage II .It had also been

requested that one unit of Stage I be taken out in place of Unit V of Stage II in view

of the high shortage conditions prevailing in the Southern Region. A meeting was

also held at NTPC Regional office with MCL and Generators to address this issue.

Participants had desired for a special meeting with participation of Railways also.

Minutes of the Meeting dated 18th April 2013 is enclosed as Annexure-VI C.

6.2.2 In the Meeting, MS I/c, SRPC pointed out that the average generation was about

75% for Stage-I and 60% for Stage-II. The average shortages were in the range of

3.5 to 4.8% for ER constituents while it was in the range of 15.5 to 18.8% for SR

constituents. The frequency below 49.7 Hz was for 3.3 % of time in NEW Grid

while it was 11.7% for SR. The issue had been taken up with ED Talcher NTPC

vide letter dated 3rd May 2013 (Annexure-VI D) requesting for improvement in

generation of Talcher Stage II and also preponing the schedule of maintenance of


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Unit III. He requested NTPC to bring back at least one unit into operation, since

two units were under shut down at present.

6.2.3 AGM, Talcher II, NTPC said that there were coal supply constraints NTPC had

been trying its best to improve the generation level and the issue was being

followed up at higher level.

6.2.4 ED, SRLDC informed that on NLDC’s request, NTPC Talcher had released the

corridor for 500 MW. He pointed out that SRLDC had been requesting for release

of corridor and no concrete action had been taken by Talcher, NTPC. Presently

corridor could have been released for 1000 MW since two units were out of bars.

Talcher Stage II may give blanket release of corridor based on the Unit outages.

He stated that all the STOA transactions would be stopped once Talcher Stage II

informed of the revival of the unit one day in advance.

6.2.5 MS I/c, SRPC said that there should be mechanism in place for release of the

corridor so that the top management need not be approached for each and every

case. He added that the concern of the OCC Forum regarding low generation at

Stage-II compared to Stage-I and also releasing of corridor should be

communicated to the NTPC Management.

6.3 Categorisation of Outage of lines/Pollution Mapping

6.3.1 The outage categorization under deemed availability of 400 KV Vijayawada-Nellore

and 400 KV Vijayawada-Vemagiri D/C lines due to pollution deposits was under

discussion from 80th OCC Meeting. In the 82nd OCC meeting, the Committee had

recommended that the issue be put up to Commercial Sub-Committee also for

further deliberations. Consequently the issue had been deliberated in the

Commercial Sub-Committee held on 17th April 2013, in which POWERGRID

informed that in other region deemed availability had been allowed for replacement

of insulators. They reiterated that outage due to pollution falls under force majeure

and requested for deemed transmission availability. Details furnished by PGCIL at

Annexure-VI E. Letter dated 06.05.2013 regarding pollution stretches in respect

of 17 other lines is enclosed as Annexure-VI F.

6.3.2 In the Meeting, representatives of KSEB and TANTRANSCO pointed out that

earlier approval was for two lines and subsequently PGCIL had furnished 17 lines


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whose outages was to be categorized under deemed availability. Decision in this

regard was to be taken up by the higher management.

6.3.3 MS I/c, SRPC said that the issue had been put up in the TCC/SRPC Meeting

scheduled for 17th and 18th May 2013.

6.3.4 AGM (OS&S), SRTS I, PGCIL vide letter dated 25.04.2013 had requested SRPC

to include Pollution Mapping for SR as an Agenda Item. Letter enclosed as

Annexure-VI G.

6.4. Draft Procedure for Outage Planning by NLDC

6.4.1 MS I/c, SRPC vide letter dated 22nd April 2013 had submitted views and comments

of SRPC and SR constituents about the same to NLDC Annexure-VI H.

APTRANSCO vide letter dated 23rd April 2013 had also expressed their views on

the Draft Procedure (copy of comments enclosed at Annexure-VI I).

6.4.2 In the Meeting, it was noted that the approved Procedure for Outage Planning was

awaited.

6.5 Implementation of RRF Mechanism

6.5.1 Hon’ble CERC in its Order dated 16th January 2013 in respect of Suo-motu Petition

No.209/2011 in the matter of implementation of Renewable Regulatory Fund

Mechanism had directed that the RRF mechanism shall come into effect from 1st

February 2013 and Mock exercise for forecasting and scheduling would start w.e.f.

1st February 2013. It was earlier noted that the utilities had not yet completed the

formalities including installation of ABT meters at Pooling Stations. The matter

was discussed in the 21st Meeting of Commercial Sub Committee held on 17th April

2013 in which state utilities submitted that they had a number of queries/doubts

that needed to be addressed and desired for a separate meeting with participation

of NLDC and had agreed to forward queries/doubts to SRLDC. The concerned

utilities were requested vide letter dated 18th April 2013, to submit their

queries/doubts at the earliest enabling SRPC to forward the same to NLDC so that

the deliberations in the meeting on 9th May 2013 would be fruitful (copy of SRPC

letter dated 18th April 2013 is at Annexure-VI J).


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6.5.2 MS I/c, SRPC informed that this issue had been discussed in the Special meeting

held on 8th May 2013. Video conference session for queries was also held in the

2nd session with NLDC. He requested that needful action was to be taken by the

constituents.

6.5.3 KPTCL enumerated the implementation status of RRF mechanism in their system

as below:

Eleven (11) pooling stations come under RRF mechanism, out of which ten (10) from Wind generators and one (1) from solar generators.

All pooling stations have been provided with ABT feature meters.

The mock exercise of all 11 pooling stations had commenced from 01.02.2013.

All coordinating agencies of pooling stations are submitting day ahead schedules & actual injections are taken from pooling stations meters every week; i.e. on Monday.

Comparison of schedules & actual are submitted every Monday.

6.6 Implementation of Enquiry Committee

6.6.1 Status of Implementation of Recommendations of Enquiry Committee may kindly

be compiled and communicated to CEA on fortnightly basis.

6.6.2 MS I/c, SRPC informed that requisite information had to be furnished by the

constituents every fortnight to SRPC for further communication to CEA.

6.7 Comments on the Staff Paper on Ancillary services to be submitted to CERC by 30th April 2013 It had been circulated in the Agenda that the comments on the Staff Paper on Ancillary

Services were to be submitted to CERC by 30th April 2013.

6.8 Reduced Power Flow through HVDC Bhadravathi

6.8.1 The issues regarding the reduced power flow through the HVDC Bhadravathi

without any change in power order made by the Operator and the Transmission

capability Reduction adopted during these instances caused by filter outages etc.

were deliberated in the earlier meetings.

6.8.2 In the Meeting, POWERGRID representative was requested to discuss the issue

with WRTS and revert back in the next Meeting with relevant updates.


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6.8.3 SE (O), SRPC pointed out that ATC/TTC margin were different for import/export on

HVDC Bhadravathi link and it would be better if TCR certification is carried out by

SRLDC.

6.8.4 MS I/c, SRPC said that the information regarding outages for HVDC Bhadravathi

was being furnished beyond 30 days, though the availability certification was to be

completed within 30 days. Internal issues between different regions of

POWERGRID should be sorted out and the information should be furnished before

25th of each month.

6.8.5 ED, SRLDC said that SRLDC would certify the TCR for HVDC Bhadravathi if

relevant information is furnished to them by PGCIL.

6.9 Present generation level at RTPS Unit VII

6.9.1 KPCL had informed that the unit was being run half load i.e. 130 MW. Now ESP

works were being carried out and it would take 6 months to be fully operational.

6.9.2 SE, KPCL informed that the generation level was being maintained at around 3MU

per/day and it would take around 6 months for ESP works to be completed.

7. GRID FREQUENCY

7.1 High frequency

7.1.1 High Frequency Grid Operation It was noted that the Regional Grid had operated above 50.2 Hz for 1.91% of the

time, during the month. It was also noted that the frequency on some of the days

was more than 50.0 Hz for considerable periods as shown below:

Date Percentage of time of frequency

50.0 Hz & < 50.2 Hz More than 50.2 Hz 02.04.2013 13.17 2.78 14.04.2013 21.74 4.03 15.04.2013 12.22 4.17 20.04.2013 13.89 4.51 21.04.2013 14.93 6.53 28.04.2013 18.06 5.63 29.04.2013 17.99 4.31

7.1.2 Constituents were advised to avoid uneconomic operation at high frequencies.


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7.1.3 High frequency excursions w.r.t. 5.2 (j) of IEGC during load change over and remedial measures to arrest such instances

7.1.3.1 SRLDC presented the Summary statement of under drawal & Over Injection at frequency>50.2 Hz.

State No. of Messages

Andhra Pradesh 42

Karnataka 6

Kerala 1

Tamil Nadu 63

Puducherry 12

Total 124

These messages are automatically generated in SCADA when Under Drawal is more than 150 MW in the last 5 minute while f > 50.2 or

when Under Drawal is more than 250 MW in the last 5 minute while f < 50.2

7.1.3.2 Letter dated 17.04.2013 received from APTRANSCO is enclosed as Annexure-VII A.

7.1.3.3 SRLDC pointed out that the issue was regularly followed up and requested the

following remedial measures to arrest high frequency operation in the Grid.

Implementation of staggered Load changeover by the constituents.

Moderating own generation

Restricted Governor Mode of Operation of all eligible machines to be in place.

Proper load management to prevent the sharp rise in frequency

Exploring the possibility of running in pump mode for two to three blocks at Kadamparai and Srisailam

Planned and advance intimation for surrendering of ISGS

7.1.3.4 AGM, NTPC expressed concern over the sudden changes in the requisition by the

states during evening Peak hours for one or two time blocks only. He added that

the units were not designed for such sudden variations. Senior Superintendent,

Ramagundam, NTPC said that the cycling of loads was not advisable and it was

not technically advisable. Chief Manager (Elec), NLC endorsed the views of NTPC

and said that the machines were getting unduly stressed on this account.


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7.2 Low Frequency

7.2.1 It was noted that the frequency of grid operation was in the lower range of IEGC

and had operated below IEGC range for 12% of the time during the month of April

2013, as compared to 7.71% during April 2012 and 11.92% during March 2013. It

was also noted that the frequency on some of the days was less than 49.7 Hz for

significant duration as shown below:

7.2.2 DGM, SRLDC informed that the frequency on some days was about 22% of time

below the IEGC range which was a matter of concern. He stated that proper

demand side management measures had to be taken care by constituents to

curtail low frequency operation. Details of caution/violation messages issued by

SRLDC to the constituents during the month of April 2013 are furnished at

Annexure-VII B. Details of 12% violation messages pertaining to over drawal

/under injection while the frequency was below 49.8 Hz over a time block are

furnished in Annexure-VII C.

7.2.3 OCC placed on record, appreciation for Chief Engineer (LD), KPTCL for not having

received any violation message during the month.

7.2.4 ADE, APTRANSCO informed that the load shedding around 1,474 MU upto 4,178

MW was carried out in AP. Purchases of more than 700 MU were made from other

states/regions. Scheduled load shedding in Hyderabad, Thirupathi, Vizag and

Warangal had been reduced from 3 hours to 1 hour from 17.4.2013. Scheduled

load shedding had been reduced in Corporations and District Head Quarters from

4 hours (in two spells) to 3 hours (in two spells) from 17.4.2013. Scheduled load

shedding had been reduced in Town and Municipalities from 6 hours (in two spells)

to 4 hours (in two spells) from 17.4.2013. Scheduled load shedding had been

Date Percentage of time of frequency

< 49.0 Hz 49.0 Hz & < 49.2 Hz

49.2 Hz & < 49.5 Hz

49.5 Hz & < 49.7 Hz

01.04.2013 0 0 0.49 22.01 02.04.2013 0 0 0.21 16.74 06.04.2013 0 0 0.21 23.47 10.04.2013 0 0 0.00 17.99 11.04.2013 0 0 0.07 18.89 25.04.2013 0 0 0.83 15.63 26.04.2013 0 0 0.56 17.36


16

continued in Mandal HQ at 8 hours (in two spells). R & C measures which were

implemented from 7th November, 2012 had been revised from April to June 2013

vide APERC order dated 17.4.2013.

7.2.5 EE, SLDC, KPTCL said that load shedding around 1,213 MU upto 2,800 MW were

carried out in Karnataka. Purchases of around 550 MU were also made from other

States/Regions. He added that Karnataka was helping the Grid during Low

Frequency operation and their UI which was positive earlier has been reduced and

now it was on negative side.

7.2.6 Dy. CE, Grid, KSEB informed that load shedding around 141 MU upto 500MW

were carried out in Kerala. Purchases of around 300 MU were made from other

States/Regions. He informed that cyclic load shedding of one hour duration was

also implemented during day off-peak hours (0900hrs to 1700 hrs).

7.2.7 EE, TANTRANSCO informed that load shedding around 1387 MU upto 3901 MW

was carried out in Tamil Nadu. Purchases of more than 600 MU were made from

other States/Regions. Energy consumption had been restricted to 75% of their

base average consumption for the previous years for all HT and EHT consumers.

Penal rate was applicable beyond the limit. All domestic consumers attract penal

rate for monthly consumption above 300 units. Energy consumption had been

restricted to 80% of their base average consumption for the previous years for all

non-domestic LT consumers. Penal rate was applicable beyond the limit. Ban on

usage of Grid Electricity for display lighting, hoarding, external illumination of

building and other publicity and sales promotion purposes had been imposed.

7.2.8 EE, ED, Puducherry informed that they were able to maintain the system without

any loading shedding.

7.3 SRLDC presented the Frequency Histogram & Frequency Duration Curve (Annexure-VII D) for April 2013.

8. VOLTAGE PROFILE

8.1 Low voltage 8.1.1 It was noted that Chennai, Bangalore, Trichur, Palakkad and Udumalpet were

facing low voltage situation.


17

8.1.2 SRLDC recommended all the states to provide Under Voltage relays in some of

the low voltage nodes in their control as given below: State Under Voltage relay required at 220kV substations

Andhra Pradesh (Chittoor area)

Chittur, Palamaneru, Kalkiri, Renigunta, Kodur, Rajampet

Karnataka (Bangalore area, Mysore area)

Bidadi, Somanahalli, Subramanyapura, HSR layout Naganathpura, Hoody, Hebbal, Whitefield, HAL, Nelamangala, Peenya, D.B.Pura, Antharasanahally, Dobspet, Basthipura, Hootagalli, Tubinkere, AStation, EDC compound, Kunigal and Kadakola

Kerala (North Kerala)

Kalamassery, Palakkad, Madakkathara, Areakode, Kaniyampet, Shornur, Malaparamba, Vadakara, Kanjirode, Talaparamba, Kasarkode, Phothenkode, Edappan, Kundara

Tamil Nadu (Chennai area)

Siruseri, KITS Park, SPKoil, Sriperumbudur, Gummidipoondi, Koratur, Koyambedu, Kadaperi, Mamambankam, Taramani, Almatti, Manali, Oragadam, Kil Pauk, Todiyarpet, Mylapore

In earlier OCC following was deliberated/noted:

Installation of under voltage (u/v) relays was agreed in principle by the constituents in the SRPC meetings. SRPC & SRLDC desired that some written communication needed to come from states regarding implementation progress of the u/v relays.

In 82nd OCCM, after discussions, it was agreed that the action plan for implementation of U/V relays would be furnished by the constituents within 15 days.

8.1.3 It was noted the detailing could be deliberated in detail in PCC meeting. SRPC &

SRLDC reminded that in principle the UV Relays had been agreed in SRPC

Meeting and hence the implementation schedule needed to be finalized at the

earliest.

8.1.4 Installation of Shunt Capacitors

Sl. No. Description AP KAR KER TN Pudu Total

1. Total Installed as on 31.03.2013 6593.40 4459.20 995.00 4055.90 77.017 16180.51

2. Carryover of 2012-13 55.00 81.44 10.00 2.60 -- 149.04

3. Capacitors installed during April 2013 0 0 0 4.8 0 4.8

4. Total Cumulative installed for 2013 -14 0 0 0 4.8 0 4.8

8.2 High Voltage

8.2.1 It was noted that the nodes at Vijayawada, Nagarjunasagar, Hyderabad, Gooty,

Karnool, Khammam, Vemagiri, Srisailam, Hiriyur, Guttur, Raichur, Kaiga,

Thiruvanthapuram and Narendra were facing high voltages. A number of lines had

tripped/hand tripped due to high voltage.


18

8.2.2 SRLDC presented the following table highlighting the severity of the problem

Station Max Voltage in kV

Average duration per day When V > 420 kV

Vijayawada 434 1372 N’Sagar 426 48 Hyderabad 429 229 Gooty 430 285 Kurnool 439 1222 Khammam 429 420 Vemagiri 428 881 Srisailam 444 1387 Hiriyur 424 73 Guttur 431 612 Raichur 433 663 Kaiga 427 194 Narendra 434 1042

Copy of few sample messages is enclosed as Annexure-VIII A. MVAR absorption

details by generating stations near High voltage zones on some specific instances

(Annexure-VIII B) were also presented.

8.2.3 Hon’ble CERC Order dated 23.12.2009 merited attention in this regard. It had been

stated in the Order that all agencies needed to provide required reactive

compensation thus avoiding the need for exchange of reactive power to/from ISTS

and maintain ISTS voltage within specific range.

8.2.4 Following remedial were reiterated:

Maximize the MVAR absorption by generators near high voltage zones Concerted action/follow up by SLDC was required at Vemagiri complex, VTPS, KTPS, Srisailam, Kaiga, UPCL and Raichur.

Operation of machines in synchronous condenser mode wherever feasible

Installation of Bus reactors as recommended by Standing Committee on Power System.

Maintaining Tap Position close to 400kV of all GT’s / ICT’s. Ensuring tap position of new generating units corresponding to 400kV before COD

Capacitors Banks to be taken out

Line opening would be the last resort by SRLDC after receipt of message from the constituents.

8.2.5 Status of commissioning of Balance Bus & Line Reactors as agreed in the 22nd Standing Committee meeting

8.2.5.1 The updated information on schedule of commissioning of reactors as originally

agreed in the Standing Committee on Power System Planning of Southern Region


19

is given at Annexure-VIII C.

8.2.5.2 Senior Superintendent, NTPC Ramagundam informed that the Bus Reactor at

Ramagundam was commissioned but COD was yet to be declared.

8.2.5.3 KPCL informed that Bus Reactor had reached Raichur TPS. However, the Bay

work for the Reactor was yet to be completed.

8.2.6 Status of Bus/Line reactors commissioning at Guttur

8.2.6.1 In the 20th TCC meeting held on 01.02.2013, high voltage conditions prevailing in

Guttur node were specifically brought to the attention of the forum. NPCIL vide

letter dated 18-02-2013 had cautioned about the more aggravated situation which

they anticipate in coming monsoon.

8.2.6.2 SRLDC reiterated that Guttur should have both bus and line reactor. It was

reminded that the Standing Committee on Power System Planning had approved

2 reactors at Guttur.

8.2.6.3 EE, KPTCL informed that shifting of Line Reactor from Hoody to Guttur was under

deliberation and decision could be taken shortly.

8.2.7 High Voltage at Vemagiri Complex

8.2.7.1 At various forums, SRLDC had raised concern over high voltage issues in respect

of Vemagiri complex as given below:

Inadequate absorption of reactive power by the generating units in addition to non-nominal tap setting of Generator Transformer.

Non utilization of 80 MVAR bus reactor at GMR Extension plant.

8.2.7.2 APTRANSCO had earlier informed that they had requested its Power System Wing

to examine this issue and take further necessary action in this regard. The

commercial issues also needed to be studied in this regard, since there was no

PPA with that particular stage of the GMR plant.

8.2.7.3 ED, SRLDC stated that many meetings were conducted with AP on high voltage

issues at various locations (specifically at Vemagiri Complex) under APSLDC.

There has been no noticeable improvement and AP has not been able to

implement SRLDC instructions to control over voltage. He added that in case the

voltage profiles are not improved in one month time, SRLDC may be constrained

to go for petition.


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9. SYSTEM SECURITY MEASURES

9.1 U/F & df/dt Relays Schemes 9.1.1 AUFR/(df/dt) quantum implemented/expected by states at various stages is given

as Annexure-IX A.

9.1.2 However, as per the ROP w.r.t. Petition 263/MP/2012 the loads available for relief

in the identified feeders were far below the value declared by the constituents. It

was noted that the Commission had directed that the issue be discussed in RPC

level meeting to decode the quantum of load which should be increased to give

desired result in a time bound manner. It was also noted that quarterly report had

to be submitted to CERC by SRLDC. The adequate load relief issue was

deliberated in PCC Meeting held on 27.03.2013 wherein all constituents had

agreed to continue with present quantum of relief proposed earlier i.e 9912 MW.

Above relief shall be ensured based on average loading of the feeder.

Subsequently RoP on hearing dated 09.04.2013 w.r.t Petition 263/MP/2012 had also been issued and the Commission had reserved the Order.

9.1.3 It was noted that Andhra Pradesh (vide letter dated 04.03.2013) added additional

feeders of average quantum of relief 89 MW for 1st stage(49.0Hz), 157 MW for 2nd

stage(48.8 Hz) and 148 MW for 3rd stage(48.6 Hz),in order to obtain the expected

load relief under UFR scheme (Annexure-IX B).

9.1.4 It was also noted that Tamil Nadu (vide letter dated 20.04.2013) had identified

additional feeders of the quantum of relief 246 MW for Stage I (49.0 Hz), 77 MW

for Stage-II (48.8 Hz) and 234 MW for Stage –III (48.6 Hz) in order to obtain the

expected load relief under UFR scheme and Procurement of UF relays were in

process and would be commissioned within 4 months (Annexure-IX C).

9.1.5 It was also noted that Kerala (Letter 06.04.2013 enclosed as Annexure-IX D) had

initiated the action plan in order to obtain the average load relief of 1032 MW (UFR

857 MW + df/dt 175 MW) to extend the trip signal to selected 11 kV feeders by

utilizing the under frequency setting available in the numerical relay installed at

substations. The substations having numerical relays had been identified.

Identification of 11 kV feeders considering the load profile and relocation of UF

relays to new stations was in process for administrative approval. The action plan

is as below:


21

Sl. No.

Probable date of completion of work Description of work Progress of Status

1. 30.04.2013 Identifying the 11 kV feeders

Initiated the process for administrative approval

2. 31.05.2013 Installation of necessary control circuits and wires

3. 15.06.2013 Testing the circuit with relevant settings of UFR

4. 30.06.2013 Final implementation of the scheme

9.1.6 KPTCL had furnished the Load relief details feeder-wise for UFR & df/dt as on

20.04.2013 (Annexure-IX E). 9.1.7 ED, SRLDC said that there were number of issues like average relief/maximum

relief/minimum relief/additional relief etc which were to be sorted out. He requested

all the constituents to furnish feeder wise details which are connected for UFR &

df/dt presently within 15 days. SRLDC would monitor from SCADA the

Max/Min/Average loadings to assess the actual relief that could be obtained.

9.1.8 It was noted that Andhra Pradesh only had implemented the additional stage for

df/dt protection scheme and other states were at various stages of implementation.

9.1.9 Details of Load Relief obtained through various defense schemes is enclosed as

Annexure-IX F.

9.1.10 As per clause 9(2) of CEA (Grid Standards) Regulations, 2010, all constituents

shall submit a detailed report of operation of AUFR at different frequencies to

SRLDC and SRPC on daily basis. KSEB and PED were only submitting the daily

report of operation of relays.

9.2 Automatic Demand Side Management Scheme (Petition No. 250/MP/2012) & GSES (Petition No. 265/MP/2012)

9.2.1 Automatic Demand Management Scheme in line with clause 5.4.2 (d) of the IEGC

was to be provided by all the constituents by 01.01.2011.

9.2.2 With respect to Petition (No. 250/MP/2012) Hon'ble CERC had issued an order

dated 14th January 2013 & RoP for 07.03.2013. Para 4 of RoP is reproduced

below:

“In response to Commission`s query whether both Grid Security Expert System (GSES) and Automatic Demand Management scheme are required or it may be duplication of facilities, the representative of the NRLDC submitted that both the schemes are separate and need to be implemented with the GSES would be operated from SLDC and RLDC level and would be at higher voltage level, Automatic Demand Management Scheme (ADMS) will be at 11 kV, 33 kV feeder level. The objective of ADMS is to control the demand as per availability and at the same time objective of GSES is for action when action by ADMS is not sufficient.”


22

9.2.3 With respect to Petition (No. 265/MP/2012) Hon'ble CERC had issued an RoP on

10th January 2013 and subsequently a special TCC was held on 11th and 12th

February 2013 and views were communicated to Hon’ble CERC. CERC had

passed order dated 5th March 2013. Para 8 (a) & (b) are reproduced below.

“8. The Commission directed to CTU to submit the following on affidavit by 16.4.2013:

(a) Clear demarcation between Automatic Demand Management Scheme and GSES, indicating voltage level at which both the schemes will operate; and

(b) Duplicity, if any, between the two schemes, in general and particularly with reference to optic fibre network proposed in Unified Load Despatch and Communication scheme.”

9.2.4 ED, SRLDC said that the time frame for GSES implementation should be finalized.

9.2.5 MS I/c, SRPC pointed out that the Final Order on Petition for GSES was still

awaited. GSES was to be implemented by POWERGRID and the issue had also

been put up as an agenda item for TCC/SRPC Meetings scheduled for 17th and

18th May 2013.

9.3 Status Review of Automatic Load Disconnection Scheme for overdrawing constituents (IEGC clause 5.4.2 (c))

It was noted that SRPC in its 14th meeting held on 27th August 2010 had agreed to

implement Automatic Load Disconnection Scheme for overdrawing constituents with

the following relief:

Sl.No. Constituents Load Relief 1 APTRANSCO 450 MW 2 KPTCL 350 MW 3 KSEB 125 MW 4 TNEB 650 MW 5 Puducherry 25 MW

The issue was noted for compliance by the concerned utilities.

9.4 Grouping of loads (IEGC clause 5.4.2 (e))

As per IEGC, to maintain the frequency within stipulated band and also to ensure

network security, the interruptible loads were to be arranged in four groups of loads,

This was for the purpose of scheduled power cuts/load shedding, loads for

unscheduled load shedding, loads to be shed through UF relays, df/dt relays and


23

loads to be shed under any SPS scheme. These loads are to be grouped in such a

manner that there is no overlapping between different groups of loads.

The issue was noted for compliance by the concerned utilities.

9.5 Tripping Details/Reports

It was pointed out that Tripping Details/Reports which were not being communicated

as per IEGC Regulations. Status is enclosed as Annexure-IX G. Trip Analysis

Reports along with supporting information in line with IEGC Regulation 5.9.6 (a) to be

furnished to SRLDC/SRPC within 24 hrs.

9.6 Declaration of availability and healthiness of various protection / defense mechanism

9.6.1 The declarations are to be submitted on monthly basis. As decided in 82nd OCCM,

KPCL had furnished proforma for consideration.

9.6.2 After discussions, it was decided to continue with existing format. SRLDC

requested the constituents to submit the healthiness certificates for protection

system regularly.

9.7 Special Protection Schemes 9.7.1 SPS for 400 kV Vijayawada-Nellore D/C line

APTRANSCO & PGCIL were requested to expedite implementation.

9.7.2 SPS for HVDC Kolar and Kudankulam

In the 82nd OCC Meeting, it was noted that loads identified for both schemes were

the same and was also suggested that preliminary identification of exclusive load

for Kudankulam SPS could commence. Details in this regard were awaited. DGM

SRTS-II informed that the Mock exercise for Kudankulam SPS was scheduled for

15th May 2013.

9.7.3 Status of SPS under implementation

Ongoing SPS scheme status is enclosed as Annexure-IX H. Respective utilities

were requested to expedite.

9.8 Status of Contingency Plan by TN to overcome variability of wind generation 9.8.1 In earlier OCC meetings SRLDC had been stating that TN may implement

automatic load reduction measures to take care of reduction in wind generation.

SRLDC had suggested SPS for containing overloading of 220 kV lines.


24

9.8.2 TANTRANSCO was requested to expedite the same.

10. SCADA & COMMUNICATION ISSUES 10.1 In the Meeting, SRLDC presented the status of data, voice and internet communication

and pending field inputs. Details enclosed as Annexure-X A.

10.2 SRLDC pointed out the following:

Jindal Generating Station complete RTU/SAS data not available at SRLDC. KPTCL may take up the issue with concerned for rectification purpose.

Dedicated voice communication from Talcher NTPC to RLDC to be provided by Talcher NTPC as MOM.

Stand by Data channel from NTCL Vallur to SRLDC. Voice communication which was out of order to be rectified.

Exercise for validation for SCADA data between RLDC and SLDCs to be carried out. SLDCs requested to get in touch with SRLDC ULDC wing.

10.3 Dy. CE, KSEB said that it was difficult to provide Tap Position for Off load Tap

changers. SRLDC pointed out that the same was required.

10.4 EE, KPTCL informed that RTUs had been installed at JSWEL and the Data availability

at SLDC was being stabilized. Once reliability of data was established it would be

extended to SRLDC. SRLDC pointed out that the LT side inputs of GT were also

required.

11. PHYSICAL AND CYBER SECURITY/CRISIS MANAGEMENT PLAN/BLACK START PROCEDURE

11.1 Physical and Cyber Security 11.1.1 Status update on Crisis Management Plan(C&DMP) of Power Sector is to be

furnished every quarter. The information is to be furnished to CEA with a copy to

SRPC secretariat.

11.1.2 SE (O), SRPC said that regular information was not being received from the

constituents. Utilities including SRLDC/SLDC were requested to furnish requisite

information every quarter. He informed that a number of presentations on

CMP/DM/Cyber Security were available on CEA website and interested

constituents could down load the same.

11.1.3 MS I/c, SRPC informed about the letter dated 23.04.2013 (Annexure-XI A) from

CEA about status of preparation of CMP for Cyber security in Power Sector. He

added that timely information was required to be furnished.


25

11.1.4 DGM, SRLDC stated that change if any, of Nodal Officers for Disaster

Management should be communicated to SRLDC.

11.2 Black Start Procedure

11.2.1 Updated information on Mock exercise is enclosed at Annexure-XI B. Constituents

were requested to furnish the schedule for July –Dec 2013.

11.2.2 DGM, SRLDC said that development of mock exercise procedure for Individual

Stations/Systems was still awaited from Karnataka & Tamil Nadu.

11.2.3 Dy. CE, KSEB informed that point to point Mock Drill for Poringal-Sholayar-

Idamalayar Chalakkudy was planned for 17.05.2013 and KDPP-Kuttiyadi-

Chevvayur for 27.05.2013.

11.2.4 SRLDC informed that Mock Drill for Gazuwaka HVDC bypass was to be planned.

NTPC informed that the exercise could be taken up during August 2013. SRLDC

stated that they would consult ERLDC and revert back.

11.2.5 Synchronizing facility was to be provided at some of the stations as furnished in

Annexure-XI C.

12. RGMO

12.1 RGMO response details for few incidents were projected (Annexure-XII A) ED,

SRLDC said that the RGMO performance in the region was far below the expectation.

12.2 Senior Superintendent, NTPC Ramagundam presented the RGMO analysis summary

for the dates 6th April, 16th April, 19th April, 24th April & 28th April (Annexure-XII B).

12.3 NTECL, Vallur also presented the RGMO response. It was pointed that the graphs

were of loads w.r.t. speed and in future graphs could be made of load w.r.t. frequency.

12.4 ED, SRLDC said that there were considerable mismatch between NTPC data and

SCADA data as received by SRLDC.

12.5 Senior Superintendent NTPC said that they would check the data again and find the

cause of mismatches. There could be some mismatch due to time synchronization and

data scanning in SCADA.

12.6 MS I/c, SRPC said that data mismatch needed to be rectified. Validation of data for

other generators was also required. SRLDC and NTPC agreed to carry out


26

reconciliation of RGMO data on 20th May 2013. He said that this issue was being

pursued at highest level and the details of RGMO status in Southern Region were

communicated to CEA recently (Annexure-XII C). He informed that CERC had passed

Order dated 29.04.2013 in respect of APGENCO Stations.

13. LGBR & OUTAGE PLANNING

13.1 Status Review on development of load forecasting tools by SLDCs as per IEGC Clause 5.4.2

The issue was noted for compliance by the states/SLDCs.

13.2 Draft Outage Deviation for the year 2012-13 in respect of Generating Units/Transmission Elements of Southern Region

SE (O), SRPC informed that the Draft Outage Deviation Report had been uploaded on

SRPC website and lot of information was still pending. The Report is to be

communicated to Hon’ble CERC. A reminder in this regard has been addressed to all

the constituents. All the utilities were once again requested to fill their portion of the

Report along with reasons for deviation and communicate to SRPC at the earliest.

14. TRANSMISSION NETWORK ISSUES AND SYSTEM OPERATION ISSUES

14.1 Following Prolonged Outages were reported to CERC.

Major Generating Unit Outage details as on 08.05.2013

SI. No. Station Unit No. Capacity

(MW) Constituent Outage

Current Status

Scheduled Revival Time

Reason Time hrs:min Date Time

hrs:min Date

1 Srisailam Pump Mode

II,III,V&VI 4X150 APGENCO 10-Aug-09

OUT June 2012

SICKLE PLATE PROBLEM. The units are not operated in pump mode as per the advice of Expert Committee until remedial measures are decided.Pump mode operation was expected to be ready by end of 2011.The Expert Committee met on 8th, 9th&10th June 11 and suggested operation in generation mode only till sickle plate is rewelded at the joint.The pump mode operation is expected to be ready after May 2012.


27

2 Ennore TPS V 110 TANGEDCO 2:15 3-Mar-12 OUT 30-April-2013

Boiler Tube Leakage. Present condition of the Unit -V Boiler Water Wall Tubes is that the Boiler is not fit for continuous operation of the Unit. Many trial operations were found to be not successful. Revamping of Unit-V is not contemplated since ETPS is to be decommissioned and new 660 MW Unit is being proposed as a replacement in the existing ETPS Units.

3 Kadamparai Pump Mode II 100 TANGEDCO 1-Apr-12 OUT Blow down Problem

4 Madras APS II 220 NPCIL 7:21 15-Apr-

13 OUT Tripped due to fire accident in GT

5 Simhapuri II 150 SEPL 13:31 18-Apr-13 OUT Loop-Seal Refractory

damaged

6 Ennore TPS I 60 TANGEDCO 21:29 19-Apr-13 OUT High chloride

formation.

Outages of Major Transmission Lines& ICTs as on 09.05.2013

SI No Description Constituent

Outage Current Status

Scheduled Revival Time Reason Time

hrs:min Date Time hrs:min Date

1 400 kV Vemagiri-GVK (JPD) I APTRANSCO 10:27 27-Mar-

2013. OUT Refused close by IPP after opening to contain O/V

2 400 kV Khammam - Kalpakka 1 APTRANSCO 17:01 16-April-

2013 OUT Tripped due to Bushing Failure at L/R

Outages of Reactors, FSCs & HVDC Filters as on 09.05.2013



Scheduled Revival Time

Reason Time hrs:min Date Time

hrs:min Date

1 Line Reactor at Guttur for Guttur-Hiriyur I KPTCL 28-May-

05 OUT

No action Plan is furnished by KPTCL. The issue would be taken up in the SC since KPTCL is in the process of procurement of BR at Guttur

2 Line Reactor at Ramagundam-N'sagar I line at N'sagar end

POWERGRID 7:09 08-Jul-12 OUT

Diversion of 50 MVAR Shunt Reactor from Waradha to N'sagar is approved. Award for Transporataion of the same is in progress. Expected to be commissioned in March 2013.

3 LANCO Bus Reactor LANCO 12-Oct-12 OUT Wnding Temperature high.

4 Kalpakka Bus Reactor 2 APTRANSCO 28-Jan-2013 OUT

Bus Reactor at Kalpakka is shifted to Khammam and connected as line reactor.


28

Major Generating units which were under Prolonged Outage and were revived during April 2013 (Till 08.05.2013)

SI. No. Description Unit

No. Capacity

(MW) Constituent Outage

Current Status

Actual Revival Reason Time


1 Bellary TPS 1 500 KPCL 22:00 17-Mar-13

Revived

18:37 7-Apr-13 Cable Fire observed

2 Ennore TPS 3 110 TANGEDCO 12:32 21-Jan-12 23:04 18-Apr-

13 Turbine Vibration

3 Vijayawada TPS 1 210 APGENCO 6:09 5-Apr-

13 20:14 17-Apr-13 Boiler Tube Leakage

4 Meenakshi 2 150 MEPL 9:28 19-Apr-13 19:41 29-Apr-

13 Steam Leakage

5 Ennore TPS 4 110 TANGEDCO 4:27 18-Apr-13 17:40 2-May-

13 H/T due to fire noticed in unit aux transformer

Major Transmission Lines, ICTs & Reactors revived during April 2013 (Till 08.05.2013)



Actual Revival Reason Time


1 400/220 kV ICT-1 at Shankarapally

APTRANSCO 14:23 7-Mar-13

Revived

14:50 13-Apr-13

AC supply to Breaker problem

2 400 kV VTPS IV - Srisailam 2 APTRANSCO 13:49 29-Mar-13 16:07 9-Apr-

13 Tripped during Grid Disturbance

3 400 kV Srisailam-Mamidipalli 2 APTRANSCO 8:44 30-Mar-13 12:53 9-Apr-

13 Opportunity S/D by AP

4 400 kV Gajwel - Shankarpally 2 APTRANSCO 1:44 26-Apr-13 16:53

7-May-13

Tripped due to R-N fault

5 400 kV Vijayawada - Lanco 2 APTRANSCO 16:26 14-Apr-13 13:33

23-Apr-13

Tripped due to Breaker problem at Lanco

14.2 MS I/c, SRPC said that reports on revival were not being received from the concerned

utilities. He requested the constituents to furnish the revival status in time for reporting

to the Commission.

14.3 ED, SRLDC said that some of the Prolonged Outages for continuing and constituents

should furnish realistic action plan with details of activities involved.

15. OTHER ISSUES

15.1 ATC/TTC calculation by SLDCs SRLDC pointed out that ATC / TTC computations needed to be furnished by State

utilities. LGBR for the next five months was also needed to be furnished by all the

constituents before 5th of every month for the purpose of ATC computations.

15.2 Minimum/Maximum Demand Ratio of Constituent States It was noted that Members were aware that the matter regarding wide variation

between maximum demand and minimum demand was being regularly taken up with


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the constituents in the OCC meetings. The details of percentage variation between

maximum and minimum demand for the month of April 2013 are given below:

State Maximum to Minimum Demand Variation % Highest Lowest Average

Andhra Pradesh 33.13 21st(Sunday)

9.44 6th(Saturday) 18

Karnataka 33.12 26th(Friday)

15.68 22nd (Monay) 21

Kerala 38.55 29th(Monday)

20.25 26th(Friday) 28

Tamil Nadu 24.68 17th(Wednesday)

10.03 3rd(Wednesday) 16

Puducherry 29.92 2nd(Tuesday)

14.31 21st (Sunday) 23

Southern Region 18.66 14th(Sundday)

9.71 30th(Tuesday) 13

Note: Highest and lowest have been computed from daily values over the month.

15.3 Forced outages of thermal units OCC was apprised of the forced thermal outages of more than 24 hours duration

during the month of April 2013. OCC recommended that the planned/preventive

maintenance be carried out as per schedule to reduce the instances of forced outage

15.4 Status of Srisailam/Kadamparai pump mode operation It was noted that Kadamparai machines had consumed about 13.64 MU in pump mode

during the month.

15.5 Data/ Information requirements of SRLDC SRLDC requested timely reporting of the following:

Loss of generation due to coal shortage / technical problems needs to be furnished for on ward transmission to NLDC by 1000 hrs on daily basis.

Providing split-up details of Non Conventional Energy Sources generation for SOLAR, BIOMASS, WIND, BIOGASSE & SMALL HYDELS in monthly data

Load Forecasting Day wise Block wise

Power Supply Position Report: Hourly Load Shedding & Daily L.S in MU to be submitted before 03:00 hrs for previous day for calculating correct shortage.

15.6 Wind Generation

DGM, SRLDC presented the day-wise Wind Generation pattern in Karnataka & Tamil Nadu during the period 1st April 2013 to 30th April 2013. Wind generation in Tamil Nadu had varied between 33.207 MU (16th April 2013) to 2.178 MU (26th April 2013). Wind generation in Karnataka had varied between 13.03 MU (18th April 2013) to 3.120 MU (3rd April 2013). Details are furnished in Annexure-XV A.


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DGM, SR II PGCIL said that Thirunelveli ICTs were getting overloaded and hence SPS was required to be in operation. It was suggested that the issue be taken up in PCC meeting.

15.7 Monthly generation data in respect of Renewable Energy Sources MS I/c, SRPC said that Monthly generation data in respect of Renewable Energy

Sources was to be sent to CEA with a copy to SRPC

15.8 Annual Report of SRPC/SRLC

All constituents who had not furnished data for Annual Report of SRPC and SRLDC

were once again requested to furnish the same.

15.9 Operating Procedures

DGM, SRLDC said that the operating procedure 2013 would be put in the web group

shortly. Suggestions/Comments could be sent to SRLDC by 24th May 2013. Operating

procedure would subsequently be finalized and put on website.

15.10 Installed Capacity variations

DGM, SRLDC requested all constituents to follow the CEA methodology/norms of commissioning and add to Installed Capacity while furnishing the figures. This was having a bearing on Thermal PLF of the States in the various reports.

EE, TANTRASCO said that the Units could be added to Installed Capacity only after COD.

It was suggested that States could include in Installed capacity with a foot note indicating that the particular Unit was yet to be declared on COD.

15.11 Coal Stock Position

It was noted that as per CEA norms, coal stock position is termed as critical (< 7 days)

or super critical (< 4 days) of coal stock. The daily Coal stock position report as on 9th

May 2013 as downloaded from CEA website is furnished at Annexure – XV B. It was

noted that the coal stock position in the following thermal stations was less than that

for 7 days generation:

Rayalaseema TPS 6 days Simhadri 1day Raichur TPS 4 days North Chennai TPS 4 days Vallur TPP 6 days Talcher STPS 1 day


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As coal stock position continued to be low, states were requested to implement

appropriate demand side management considering lower availability due to coal

shortage.

The Coal Stock status received from Generators/Constituents is enclosed as

Annexure-XV C.

15.12 Normative vs. average actual ex-bus generation SRLDC presented the details of normative and average actual ex bus generation in

respect of ISGS during the month of April 2013 (Annexure-XV D).

15.13 Utilisation of inter-regional links

SRLDC presented the utilization of inter-regional links (Annexure-XV E). It was noted

that Gazuwaka link had imported more power compared to the previous year.

15.14 Drawal Extremes DGM, SRLDC presented the statement of Drawal Extremes for the month of April

2013. The maximum till date are given in the table below:

State Extremes April 2013 Extremes till date

Max (MW) Date Time

Block Min

(MW) Date TimeBlock

Max(MW) Month Min

(MW) Month

AP 3468 21.04.13 38 1778 21.04.13 73 4005 Aug. 08 -1280 Aug. 06 KAR 1536 23.04.13 71 491 15.04.13 71 2722 Sep. 10 - 947 Sep. 09 KER 1763 17.04.13 91 1129 04.04.13 46 2024 Jul-12 -610 Oct. 07 TN 3734 12.04.13 73 2439 06.04.13 13 4315 May 11 -100 Oct. 03 PUDU 320 20.04.13 50 215 01.04.13 17 319 Feb. 13 8 Dec. 11

Andhra Pradesh, Karnataka, Kerala & Tamil Nadu had variations of 1690 MW,

1045MW, 634 MW & 1295 MW respectively.

15.15 Stranded Capacity MS I/c, SRPC informed that a Committee headed by Chairperson, CEA with two JS

from MoP as Members to explore the possibility of utilizing Stranded Capacity had

been set up. One Meeting had already taken place while the second meeting was

scheduled shortly. He requested the constituents to furnish the requisite information

as and when requested.

15.16 PSS software Training

SRLDC informed that one more advanced System Studies Software (PSS/E) Training

was likely to be held shortly. Nominations were requested.


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15.17 ATC/TTC Computations

SRLDC informed the ATC/TTC computations for the States had been put on SR

Power System Web group. States were requested to study and revert back with their

observations.

15.18 Other information

Planned and Forced outages of Generating Stations are enclosed as Annexure-XV F.

Status of upcoming Generating and Transmission Schemes in Southern Region are enclosed at Annexure-XV G.

Variable Cost of ISGS/CGS Stations is enclosed as Annexure-XV H. Details of Bilateral exchanges(as per PSP) and Power Exchange(as

furnished by States) are enclosed at Annexure-XV I. PLF of Major IPPs is enclosed as Annexure-XV J. Details of Maintenance of Transmission Elements are enclosed as

Annexure-XV K. 16. MEETING SCHEDULE

It was observed in the Meeting that a number of participants left the meeting before

scheduled closure. MS I/c, SRPC said that at times certain issues were not fully

deliberated as the concerned Member had left. OCC Meeting had been compressed to

one day (in place of two days) on the request of the constituents. All the participants

were requested to appraise their management and also kindly be present between 10

hrs to 18 hrs for fruitful deliberations. It was also noted that KKNPP was not attending

the OCC meeting and the issue could be taken up accordingly.

17. It was noted that Hon’ble CERC had issued an Order on FRC computations. A new

procedure on Congestion Regulation had also been approved by CERC vide its order

dated 22.02.2013. It was decided that a Workshop be conducted by SRLDC on 28th May

2013. Officers of concerned Departments could be nominated to attend this Workshop.

SRLDC pointed out that the Reliability Coordinators for Congestion Management were to

be nominated by SLDCs and hence they could be nominated for the Workshop.

18. VOTE OF THANKS

MS I/c, SRPC thanked the delegates for their active participation in the meeting.


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19. DATE & VENUE OF THE NEXT MEETING

The schedule for next OCC Meeting is as follows:

Meeting : 84th OCC of SRPC

Date : 12.06.2013 (Wednesday) Time : 10:00 Hours Venue : SRPC, Bangalore

***

Documents

SOUTHERN REGIONAL POWER COMMITTEE … AGM, NTPC expressed concern that on 30th April 2013, 220 KV Kayamkulam-Edamon line was taken out from Edamon end without any information whatsoever