SOUTHERN REGIONAL POWER COMMITTEE - Karnataka · 2014-07-02 · Southern Regional Power Committee...

Minutes of the 96th OCC Meeting of SRPC held on 11th June 2014

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Southern Regional Power Committee Bangalore

Minutes of the 96th Meeting of Operation Coordination Committee of SRPC held at Bangalore on 11th June 2014

1. Introduction

1.1 The 96th Meeting of the Operation Coordination Sub Committee was conducted at Bangalore

on 11th June 2014. The list of Participants is furnished at Annexure-1A.

1.2 Shri S.R. Bhat, Member Secretary I/c, SRPC welcomed all the participants to the Meeting.

He informed that Secretary (Power) had taken a meeting on 6th May 2014 to discuss the

preparedness of the power sector in view of predicted sub normal monsoon and the Minutes

of the Meeting had been circulated. There were certain actionable points like

deferring/rescheduling of planned shutdown of thermal generating units, optimal utilization of

hydro sources etc. Review meetings were also being conducted in this regard and next

review meeting was scheduled on 09th June 2014. It had been noted that there was a strong

probability of deficient monsoon which could be about 95% of Long Period Average (LPA).

Issue regarding operationalization of 220 kV Upper Sileru – Balimela line so as to augment

transfer of power from NEW grid to SR grid had also been discussed. He emphasized that

other 220 kV inter regional line Chikodi-Talangade/Mudsinghi (Kolhapur) line should also be

closed . A team of officers from SRPC, SRLDC, PowerGrid, KPTCL, WRLDC & MSETCL

was visiting Chikodi (Kar) Talangade/Mudsinghi (MSETCL) stations for reviewing equipment

and other protection availability, healthiness etc. He stated that operational healthiness was

to be ensured prior to operation either on radial/parallel mode. Legal/commercial/scheduling

issues could be discussed and finalized taking in view concerns of all stakeholders. He also

informed that the day before a Meeting of Study Committee of National Reliability Council

had been conducted. Certain suggestions/views given by SRPC which had been discussed

would also be discussed during the course of this Meeting. He stated that realization of relief

from AUFR and df/dt schemes had been low and SRLDC had been taking up the issue

under section 1.5 of IEGC Regulations. He expressed concern that the quantum of relief was

not up to desired extent. Issue regarding coal supply shortages in thermal stations had also

been discussed in the Meeting chaired by Secretary (Power) . Ramagundam & Simhadri

power stations had achieved monthly availability of more than 100 % during May 2014

despite tighter norms, which deserved appreciation. He informed that the shutdown

proposals of HVDC Talcher- Kolar Bipole and Ramagundam-Bhadrawathi HVDC had been


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received which had already been approved in ERPC / WRPC. The same needed to be

deliberated in the Meeting.

1.3 Superintending Engineer (O), SRPC took up the Agenda for discussions.

2. Confirmation of the Minutes of the 95th Meeting of OCC of SRPC held on 9th May 2014 Following amendment in para 10.4 requested by NTECL, Vallur was agreed by OCC:

“10.4 AGM, NTECL Vallur informed that they had procured four converter cards and

handed over to PGCIL for installation. PGCIL stated that the connector chords

would be required for installing those cards and it would take 2 weeks to install

after receipt of those connector chords.”

3. Monthly Outage Plan

3.1 ISGS/CGS Units

3.1.2 MS I/c, SRPC informed that as per Minutes of the Meeting in MOP (MOM at Annexure- 3A),

NTPC stations had been suggested to postpone planned shutdowns till September/October

2014 i.e from monsoon period to subsequent lean period in anticipation of weak monsoon.

NTPC had also been directed to maintain adequate stock of liquid fuel in RGCCP,

Kayamkulam and keep the plant in readiness for operation. All hydro generating stations in

the Region had also been directed to optimize hydro generation and not to avail any shut

down before October 2014.

3.1.3 After discussions, NTPC, Ramagundam agreed to defer planned shutdown of Unit 6 to

23.09.2014 for duration of 55 days. NLC stated outage of either U5 or U7 of NLC TS II could

be postponed to October 2014. NTPC, Simhadri also agreed to postpone planned outage of

unit 4 till November 2014. However, if coal stock remained critical, it may be prudent to avail

maintenance as per schedule.

3.1.4 SRLDC vide letter dated 05th June.2014 (Annexure-3B) had stated that the rescheduling of

outage of Vallur unit should not be allowed.

3.1.5 MS I/c, SRPC said that as already noted the issue regarding coal supply had been

discussed in the MOP meeting. Any issue in this regard could be brought to the kind

attention of MoP/CEA.

3.1.6 AGM, Simhadri, NTPC stated that there had been no improvement perceived in the coal

supply. Presently, coal stock in Simhadri TPS was adequate for 0.67 days only. NTPC

Simhadri was having Coal Linkage from MCL and the coal supply materialization was only

about 54% of the programme. Diversion of Coal from Farakka, Kahalgaon etc was also


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carried out in the last few days.

3.1.7 MS I/c, SRPC suggested NTPC Simhadri may raise their concerns on current coal stock

position/supply which could be taken up OM division of CEA. Subsequently, SRPC vide

letter dated 16th June 2014( Annexure-3C) had taken up the issue with CEA.

3.1.8 NTPC, Ramagundam vide letter dated 13th May 2014 ( Annexure- 3D) had informed that

Unit 5 (500 MW) of Ramagundam STPS had been stopped at 01:14 Hrs on 10th May 2014

on account of high turbine shaft vibrations. Subsequently, it had been decided to go ahead

with opening of HP & IP Turbines for inspection and repair. Accordingly, the unit had been

declared under Annual Shut down from 00:00 Hrs of 13.05.2014 to 13.06.2014. Vide letter

dated 02.06.2014 (Annexure- 3E) NTPC, Ramagundam had submitted the revised overhaul

schedule taking into account the above.

3.1.9 NTPC, Talcher vide letter dated 16th May 2014 (Annexure-3F) had communicated that as

per the approved LGBR of SRPC for 2014-15, shut down for AOH of Unit 6 of NTPC,

Talcher would be availed for 30 days from 08.06.2014 to 07.07.2014.

3.1.10 NTECL, Vallur vide letter dated 14th May.2014 (Annexure-3G) had communicated revised

outage plan. It had been planned to extend the duration of overhaul of Unit 1from 30 days to

40 days due to more tube leakages .The shutdown had earlier been planned to be availed

during the period 16.06.2014 to 25.07.2014. Unit 2 had been programmed for shut down (

condenser jet cleaning ) for a period of one week during June 2014 before taking out Unit 1

for annual overhaul. Unit 3 shut down for PG test preparation would be availed in October

2014.

3.1.11 DGM, NTECL, Vallur said that outage of unit 1 had been rescheduled based on the request

of TANGEDCO.

3.1.12 EE, TANTRANSCO said that the rescheduling of the Vallur unit had been requested

keeping in the view the proposed shutdown of KKNPP unit during that period.

3.1.13 ED, SRLDC pointed out that the rescheduling of planned outage by NTECL, Vallur was

unilateral (on request of one constituent only i.e. TN). ISG stations rescheduling could only

be done in OCC forum only after approval of all stakeholders. Outage plan was required to

be necessarily adhered since ATC/TTC was being calculated considering the outages as

per the approved outage plan . Any rescheduling could lead to changes in ATC/TTC which

in- turn impacted already approved shutdowns. Constituents plan their purchase, demand

side management measures according to the outage planning, hence the views of all the

constituents are required to be considered.

3.1.14 AGM, SRLDC pointed out that rescheduling of planned outage of any ISGS unit should be


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discussed in the OCC forum. STOAs had been approved based on the outage planning of

the generating units. STOAs of Kerala may be affected because of the proposed reschedule

of maintenance of Vallur Unit. On a query, he informed that the KKNPP generation had not

been considered for ATC/TTC calculations since it was infirm power.

3.1.15 DCE, KSEB expressed concern that Kerala was staring at huge deficit and they were

depending on STOA transactions to meet the demand. STOA curtailment would further

affect LGBR in the state since weak monsoon was anticipated.

3.1.16 MS, I/c SRPC stated that the issues should have been discussed in the OCC forum to

obtain consent of all beneficiaries. There were implications with regard to ATC/TTC,

STOA/MTOA curtailments etc. He suggested NTECL, Vallur may consider postponement of

shutdown to next year (after May 2015) in case they were unable to adhere the original

schedule.

3.1.17 DGM, NTECL clarified that the boiler license for Unit I had already been extended for 3

months and further extension would not be possible. He also informed that 7 days shut

down would be required for Unit II of NTECL in which 4 days simultaneous SD of Unit I & II

was required for maintenance of common system prior to Unit I shutdown.

3.1.18 OCC expressed serious concern that simultaneous shut down of both units had not been

informed to the forum earlier.

3.1.19 After deliberations, OCC forum (except TN) requested NTECL, Vallur to adhere to the

outage plan so that there would be no curtailment of STOA of S2 constituents on this

account.

3.1.20 ED, SRLDC informed that in case of non-compliance of the above in real time, SRLDC may

be constrained to issue non-compliance messages, curtailment of STOA and take action as

per prevailing Regulations.

3.1.21 On a query SRLDC clarified that ATC/TTC would be revised (downward/upward) according

to NTECL units on bars.

3.1.22 KGS vide letter dated 03rd May.2014 (Annexure-3H) had informed that biennial shut down

of Unit 2 of KGS was planned from 16th November 2014 to 17th December 2014 to carry out

mandatory surveillance tests and major maintenance works.

3.1.23 Details of Outages of CGS/ISGS stations approved for the month of May/June 2014 is

furnished in Annexure- 3I .

3.2 ISTS/State Sector Transmission Lines and Elements

3.2.1 Outage proposals for the months of June/July 2014 in respect of Central and State

Transmission lines and elements were discussed in the Meeting and the outage dates


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approved. Details of the same were hosted on SRPC website

(http://www.srpc.kar.nic.in/website/2014/operation/plout11-06-14.xls).

3.2.2 SE (O), SRPC pointed out that shutdown requests for the same month were also being

furnished which was to be avoided. Except KSEB, no other state had furnished the planned

shutdown of the STU lines/elements for the year 2014-15. He requested the other states to

furnish the requisite information.

3.2.3 MS I/c, SRPC informed that the shutdown requests of Bi-Poles of HVDC Talcher - Kolar and

HVDC Bhadrawathi had been received which had already been approved ERPC and

WRPC.

3.2.4 SRLDC recommended that 765 KV Raichur -Sholapur line may also be taken out during

Talcher - Kolar Bi-Pole shutdown. Constituents requested NLDC to take appropriate call on

taking out Raichur - Sholapur line during the shutdown. Forum approved the shutdowns with

a request for the dates 22.06.2014 to 23.06.2014 instead of 23.06.2014 to 24.06.2014.

However, if not possible the outage may be concurred for 23.06.2014 to 24.06.2014.

3.2.5 Regarding the Bi Pole outage at Bhadrawathi, the forum felt that the outage be availed

keeping in view the provisions of MoM held on 6th May 2014 in MOP.

4. Availability and Requirement

4.1 Table below furnishes anticipated availability as furnished in the 95th OCC against

actual availability for the month of May 2014. :

(Figures in MU)

4.2 DE, APTRANSCO informed that the actual consumption in the state was lesser on account

of strike .

4.3 EE, TANTRANSCO informed that the actual consumption had increased on account of

higher demand which was met through higher quantum of purchases and wind energy.

STATES

Actuals furnished by

States for 96th OCC

Anticipated availability furnished by States in

95th OCC Variation

Andhra Pradesh 242.69 255.97 -13.28

Karnataka 163.44 165.00 -1.56

Kerala 61.41 62.00 -0.59

Tamil Nadu 257.44 252.02 5.42


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4.4 Anticipated Availability and Consumption

4.4.1 SE(O), SRPC informed that based on the IMD forecast, the South West monsoon was likely

to be 95 % of Long Period Average (LPA) with a model error of +/- 5%. SRPC Secretariat

had made an analysis (Annexure-4A) based on the MoP targets set for hydro generation

considering 85% and 70% of hydro availability. Constituents had been suggested to

consider the 70% hydro generation for the purpose of upcoming LGBR.

4.4.2 Anticipated availability and consumption as furnished by the states for the next two months

– June 2014 & July 2014 are furnished below.

JUNE 2014 (EX-Bus Figures in MU)

State Andhra Pradesh

Telangana Karnataka Kerala Tamil Nadu

SR

Thermal $ 50.70 59.26 46.30 56.72 212.98

Diesel and Gas 1.55 1.81 0.00 0.19 5.17 8.73

Hydro 1.12 1.30 23.80 12.97 8.70 47.89

CGS Drawals 21.48 24.37 38.63 11.50 73.31 169.29

Simhadri TPS 10.84 12.66 23.50

ER/NR 2.50 2.93 1.43 6.86

Imports & Purchases from IPPs etc

5.81 6.79 44.77 6.30 97.30 160.97

Proposed Purchase

20.64 21.51 16.97 59.12

Total Availability 114.64 120.90 150.00 32.39 241.21 659.14

Anticipated Requirement

138.44 120.90 150.00 54.57 253.26 717.17

Deficit/ Day -23.80 -22.17 -12.06 -58.03

Surplus/ Day** 9.73 20.47 30.20

R & C Measures 23.80 0.00 23.80

** Hydro and other generation/purchases would be regulated to meet the demand.

$ Includes Krishnapatnam JV inform power injection


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JULY 2014 (EX-Bus Figures in MU)

State Andhra Pradesh

Telangana Karnataka Kerala Tamil Nadu

SR

Thermal $ 46.74 54.62 43.00 64.57 208.93

Diesel and Gas 1.55 1.81 0.00 0.19 5.57 9.12

Hydro 3.94 4.61 22.90 17.32 10.80 59.57

CGS Drawals 18.33 21.43 38.29 12.90 69.42 160.37

Simhadri TPS 10.84 12.66 23.50

ER/NR 2.50 2.93 1.45 6.88

Imports & Purchases from IPPs etc

5.81 6.79 53.06 8.19 74.95 148.80

Proposed Purchase

21.17 21.92 10.81 53.90

Total Availability 110.88 126.77 150.00 40.06 225.31 653.02

Anticipated Requirement

137.82 130.11 150.00 55.23 247.14 720.30

Deficit/ Day -26.94 -3.34 -15.16 -21.83 -67.28

Surplus/ Day** 18.06 18.06

R & C Measures 26.94 3.34 0.00 30.28

** Hydro and other generation/purchases would be regulated to meet the demand.

$ Includes Krishnapatnam JV inform power injection

Constituents agreed to initiate requisite measures to maintain appropriate load generation balance in their system, and adhere to the provisions of IEGC Regulations.

4.4.3 DE, APTRANSCO informed that the deficit would be met through purchases and the

balance through R & C measures. Upon enquiry, he clarified that infirm power injection of

about 3.32 MU (138 MW) from Krishnapatnam JV had been included in the availability for

the month of June/July 2014.

4.4.4 DCE, KSEB informed that the deficit would be met through purchases from power exchange

and balance through load shedding.

4.4.5 EE, TANTRANSCO informed that they were purchasing around 800 MW from the CPPs


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located in the state. They were anticipating more wind energy availability with which the

deficit would be reduced to some extent.

4.4.6 LGBR for real time ATC/TTC

4.4.6.1 SRPC Secretariat had presented the points/views (Annexure-4B) submitted to Study

Committee of National Reliability Council. The need for having quality node wise data from

the constituents (for 96 time blocks / different scenario like peak / off-peak) was also

emphasized before computation of ATC for optimal utilization of transmission system . SR

constituents were requested to submit the validated data in this regard.

4.4.6.2 On a query from KSEB about considering real time flows for revision of ATC, it was stated

that ATC declaration was for future time horizon. The constituents had to assure about the

changes in Load Generation Balance which had contributed to under utilization of ATC and

similar conditions would prevail which may be utilized. In case margins are released and

subsequently there is change in Load Generation Balance, all the STOA transactions would

need to be curtailed on prorata basis.

4.4.6.3 SRLDC stated that due to dynamics of the power system, there may be high uncertainty in

real time LGB. In case of significant change in LGB for longer duration, the responsible

constituent/s may submit revised LGB for a specific period, preferably on day ahead basis

for validation of SRPC and subsequent revision of ATC by SRLDC. Such margins created

would be made available for short-term transactions including power exchanges as per

applicable CERC Regulations. However, for any change of status in Transmission line,

Generator etc which was not considered while computing ATC, SRLDC would carry out

studies accordingly and revise ATC for the rest of the period.

4.4.6.4 SRPC clarified that there was no role of SRPC Secretariat for validation in real time or on

day ahead basis. Neither any regulation mandated such requirement nor did they have the

infrastructure (24 hrs Control Room) to take up such works. Clause 4.5 of Detailed

Procedure for Relieving Congestion in Real Time Operation was brought to kind notice as

given below:

“ NLDC may revise the TTC/TRM and ATC due to change in system conditions (including

commissioning of new transmission lines/generation), vis-à-vis earlier anticipated conditions

which included change in network topology or change in anticipated active or reactive

generation or load at any of the nodes in the study. Revisions may be done by NLDC based

on its own observations or based on inputs received from SLDCs/RLDCs. Revised TTC,

TRM and ATC shall be published on website of NLDC and RLDCs along with reasons

thereof. ”


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On perusal of the above, it can be seen that ATC/TTC may have to be revised in real time

even for Load Generation Balance change. There was no role of SRPC Secretariat after

LGBR validation on monthly basis.

4.4.6.5 SRLDC stated that real time revision of ATC/TTC for changes in Load Generation Balance

would not be carried out by SRLDC unless LGBR is vetted by SRPC.

4.4.6.6 The following was also noted from Para 54 of Order dated 22.02.2014 in respect of Petition

No. 167/Suo-Motu/2012 as given below:

“ NLDC further states that Enquiry Committee has recommended the following:

NLDC and each RLDC should have one real-time security desk in all the shifts to

be manned by engineer capable of carrying out TTC calculations. To facilitate this,

manpower at NLDC and RLDCs need to be enhanced with regulatory support to take

care of financial aspects. Till this arrangement can be firmed up, various scenarios of

outages could be built, which then can be used by despatcher in real time. Faster

algorithm for calculation of TTC may be adopted by the load despatchers to update it in

real time under outage conditions. Post disturbance NLDC/RLDCs are taking up the

above recommendation for manning of security desk at each RLDC and NLDC by

engineers capable of carrying out TTC calculations….”

4.4.6.7 SRLDC observed that System Studies / Security analysis being carried out in real time are

primarily meant for demand management, clearance of emergency outages, averting any

eventuality due to lack of meeting n-1 criteria etc.,

4.4.6.8 MS I/c, SRPC suggested that the issue regarding real time ATC may be taken up with

National Reliability Council for Electricity.

4.4.6.9 ED, SRLDC informed that base case for ATC calculation would be provided by SRLDC and

requested SLDCs to update the data of their respective control area for each node for

different scenarios. SLDCs should give LGBR data in 4 month advance for example for the

month of October 2014 in June 2014. On vetting by SRPC, the data submitted by

constituents in PSSE format of base case, would be stitched / combined together. The

consolidated system studies would be carried out by SRLDC for arriving optimal solution

and declaration of ATC accordingly.

4.4.6.10 It was clarified by SRPC that validation of LGBR would be carried out in OCC forum on

monthly basis only as mandated in the Regulations. The vetted data could be utilized for

TTC/ATC computations. For subsequent period, SRLDC would interact with states for

vetting/validation of data.


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4.4.6.11 SRLDC suggested having Study Committee meeting on monthly basis to discuss the LGB

and get expertise by the SLDCs in furnishing node wise accurate data in the base case /

PSSE format, running studies for the respective control area etc.

4.4.6.12 SE(O), SRPC pointed out that as per provisions of Congestion Regulations, States/SLDCs

were to carry out proper analysis of data and pass it to RLDC as given below:

“State Load Despatch Centre(SLDC) shall assess the Total Transfer Capability(TTC),

Transmission Reliability Margin(TRM) and Available Transfer Capability(ATC) on its inter-

State Transmission Corridor considering the meshed Intra-State Corridors for exchange

(import/export) of power with inter-State Transmission System(ISTS). These figures along

with the data considered for assessment of TTC would be forwarded to respective RLDC for

assessment of TTC at Regional level.”

Thus, there was need for high involvement/commitment from the SLDCs.

4.4.6.13 TANTRANSCO and KPTCL expressed that it may not be possible for them to provide LGB

for 96 time block. EE, KPTCL said that the hydro reservoir levels would not be known 4

months in advance and the generation from NCE sources was to be allowed as per the

Regulations. The data in advance of 4 months may not be accurate. EE, TANTRANSCO

expressed that the LGBR data being suggested could not be given immediately by SLDCs

and proper framework had to be developed by SLDCs in this regard. SRPC/SRLDC

mentioned that in the absence of quality data submission by the constituents, it may not be

appropriate to give any comments on the ATC declaration of SRLDC. Accordingly, SRLDC

suggested that till the submission of fairly accurate node wise data by all the SR

constituents, the constituents may kindly avoid any adverse comments / questions.

4.4.6.14 After deliberations, it was concluded that the provision of Node wise and block wise LGB

data by states should commence within a period of three months . Till such time, the states

may furnish upcoming 5 months LGB data which would be discussed in OCC for validation.

5. REVIEW OF THE POWER SUPPLY POSITION

5.1 Grid Highlights

Frequency remained within IEGC range during May 2014 (49.90 -50.05 Hz) for 51.54 % of time.

Frequency remained below 49.90 Hz for 26.88% of time for the month of May 2014. Average frequency for the month was 49.97 Hz.

Frequency remained above 50.05 Hz for 21.58% of time during the month of May 2014.

Andhra Pradesh, Kerala, Karnataka & Tamil Nadu imported 285 MU, 145 MU, 13 MU & 345 MU respectively inter-regionally through bilateral exchanges.

Utilities located in Andhra Pradesh , Karnataka & Tamil Nadu imported 288 MU, 34 MU


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& 0.83 MU respectively through Power Exchange.

Utilities located in Andhra Pradesh, Karnataka, Kerala, SEPL & MEPL exported 38 MU, 133 MU, 0.852 MU, 18 MU & 0.81 MU respectively through Power Exchange.

Andhra Pradesh, Kerala & Tamil Nadu imported 623 MU, 117 MU & 56 MU intra-regionally.

Utilities located in Andhra Pradesh, Karnataka, Kerala & Tamil Nadu exported 347 MU, 384 MU, 56 MU & 10 MU intra-regionally.

Puducherry met a day energy consumption of 7.39 MU on 30th May 2014 which was maximum till date.

Wind mills of capacity 2.2 MW had been added in Tamil Nadu during the month of April 2014

LILO of one ckt of 400 kV Neyveli-Trichy DC line at Nagapattinam Pooling station under common transmission scheme associated with ISGS projects in Nagapatiinam/Cuddalore area of Tamil Nadu was ready for the intended use wef 03.05.2014

5.2 LGBR forecasted figures vs. actual figures

It was noted that the variations between actual and forecasted availability/ requirements

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

following cases:

Forecasted Actual

Deviation from Actual

% Variation

Reason

Andhra Pradesh

Energy Requirement (MU) 9086 8110 976 -11 Due to strike in AP

Demand Requirement (MW) 13722 12305 -1417 -10 Growth not as anticipated.

Kerala

Energy Availability (MU) 1580 1944 364 23 Increase due to higher purchases. Demand Availability(MW) 2337 3388 1051 45

Tamil Nadu

Demand Availability (MW) 11343 12671 1328 12 Increase due to higher purchases

5.3 MoP targets vs. actual

5.3.1 It was noted that MoP monthly generation targets for the month of May 2014.

Constituent

Deficit in May 2014 target

Reason Cumulative in

the year 2014-15

Reason

Andhra Pradesh

Coal Due to strike in the state


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Private sector Due to less availability of gas

Private sector Due to less availability of gas

Karnataka

Hydro Due to conservation of hydro

Hydro Due to conservation of hydro

Thermal Forced outages of BTPS U1 and RTPS U5

Thermal Due to forced outages

Kerala Hydro Conservation of

Hydro Hydro Conservation of

Hydro

Tamil Nadu

Thermal Backing down of thermal generation due to transmission constraints and forced uotages.

Thermal Backing down of thermal generation due to transmission constraints

Wind Less than anticipated

Wind Less than anticipated

NTPC, Ramagundam STPS

Ramagundam STPS

Due to rescheduling of Shut downs

Ramagundam STPS

Due to rescheduling of Shut downs

MAPS Nuclear Due to 3 days forced outage

Nuclear Due forced outage

5.3.2 In 94th Meeting of OCC, it had been pointed out that TN wind generation was less by around

5,200 MU than anticipated. Generally the wind generation in Karnataka and TN followed the

same pattern. The issue was to be studied by TNSLDC and revert back with reasons.

Analysis was awaited.

5.4 Demand / Energy

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

Consumption per day (MU) in respect of the SR constituents for May 2014 vis-à-vis May 2013.

The maximum daily consumption by the respective constituents during May 2014 is also

included.

System

Actual Maximum Demand (MW)

Average Consumption/day (MU)

Max. Daily Consumption during

May 2014 (MU)

May 2014

May 2013

%-age May 2014

May 2013

%-age

Andhra Pradesh

11766

11823 -0.48 251.36 249.00 +0.95 264.96

Karnataka 8712 8072 +7.93 167.27 160.00 +4.54 193.17

Kerala 3399 3093 +9.90 61.66 57.00 +8.17 67.41

Tamil Nadu 12991 12035 +7.94 264.62 257.00 +2.96 284.79

Puducherry 348 332 +4.95 7.02 6.89 +1.88 7.39


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Southern Region

35342 32927 +7.33 751.47 729.89 +2.96 817.78

5.4.2 It could be seen from the above that Peak Demand for all constituents except AP had showed

a positive growth rate which had varied between 8% and 10% as compared to May 2013.

Southern Region as a whole had met maximum demand of 35,342 MW in May 2014, which

was 2,415 MW more than last year’s figure of 32,927 MW. In terms of average daily energy

consumption all the states registered a positive growth rate of around 1- 8%. Southern Region

had recorded growth rate of around 3 %.

5.4.3 It was also observed from the SR Load Duration Curve for May 2014 (Annexure-5A) that the

loads had substantially increased when compared May 2013 while the loads had been

decreased when compared to April 2014.

5.5 Hydel Availability

5.5.1 Energy availability in major hydel reservoirs at the end of May 2014 vis-à-vis that for May

2013 was reviewed, which is detailed below:

(Figures in MU) System

Reservoir

Energy at FRL

Storage as on Inflows in May 2014

31.05.14 31.05.13 Anticipated Actual

ANDHRA PRADESH Jalaput Srisailam (MDDL:243.8m) Nagarjunasagar (MDDL:149.3m) *Level in meters

495

269.8*

179.8*

250

831.16* 146.80

254.66*

71.984 157.73*

116.74

826.25* 38.76

247.77*

108.53 158.37*

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2

46 0

KARNATAKA Linganamakki Supa

4547 3152

540 936

683 685

22 26

18 95

KERALA Idukki Kakki Total

2148 916

3843

458 46

635

260 85

504

69 39 179

77 46 179

TAMIL NADU Nilgiris Total (Excluding Mettur)

1504 2183

255 378

271 343

43 85

71 142


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5.5.2 SRLDC informed that hydro storage as on 30th May 2014 was about 32.84 % more compared

to last year while 0.17% less compared w.r.t 10 years monthly average.

6. MAJOR ISSUES

6.1 Migrating to flow gate based TTC methodology for S1-S2 area.

6.1.1 SRLDC vide letter dated 15.05.2014 (Annexure-6A) had communicated that the computation

of ATC/TTC would be done flow gate wise from the month of May 2014 rather than the

scheduling limit which was in vogue due to large variations in LGB, variability of wind

generation and frequent outage of units. Accordingly, the ATC/TTC for May 2014 to Aug 2014

had been revised flow gate basis and is available at NLDC website. Salient points of the

computations/procedures under this methodology are as below:

The actual prevalent LTA & MTOA had been considered for May 2014(from 16.05.2014)

Normative ex-bus excluding the units under prolonged outage had been considered for LTA calculation

In case of real time congestion of S1-S2 flow gate, the following measures had been proposed.

The constituents would be directed to make the injection/drawal deviations to ‘Zero’

If deviation of injection/deviation persisted, congestion charges as per CERC (Measures to relieve congestion in real- time) Regulations 2009 would be kicked in.

When no significant deviation of injection/drawal but congestion existed, curtailment of transactions would be effected in the following order:

a) URS power from generating station of S1(on pro-rata basis) to S2 constituents

b) STOA(on pro-rata basis) of S2 constituents

c) After exhausting STOA curtailment, MTOA (on pro-rata basis) of S2 constituents.

Reallocation of URS power followed by Contingency Applications would be considered based on ATC declared on NLDC website subject to margins available.

Revision of ATC would be done in case of ISGS unit outage for longer duration and sustained LGB changes (to be intimated in writing by constituents) which may necessitate a relook into ATC/TTC. The same would be published as a revision in NLDC website.

Any condition like line outage/tripping which necessitates downward revisions of ATC/TTC for the period of outage would be displayed on the home page of SRLDC website as a marquee and curtailment would be effected.

6.1.2 SRLDC informed that Real Time TTC/ATC would not be computed by them and the matter

was to be taken up with NLDC. Constituents were requested to furnish Block wise/Day-wise

LGBR figures (Node-wise) for the coming five months and the system should be in place


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within three months. In the mean while SRLDC TTC/ATC figures along with assumptions and

LGBR would be circulated for validation.

6.1.3 NLDC vide letter dated 04.06.2014 (Annexure-6B) had communicated clarifications on S1-S2

TTC/ATC for May 2014 as per revised methodology. SRPC pointed out that reduction of

margin though the TRM had been reduced had not yet been clarified .

6.2 Line loading/ Infirm Injection/ Injection into ISTS by State Generators

6.2.1 Issue regarding high loading of ISTS lines likes 400 KV Kolar-Hosur, SV Chatram- Puducherry

etc & evacuation issues of North Chennai II & Krishnapatnam JV had been deliberated in the

95th Meeting of OCC. Number of issues was summarized and Recommendations were

finalized in the Meeting

6.2.2 AGM, SRLDC informed that there had been some improvement in line loadings in Tamil Nadu

since wind generation had picked up. In case of AP, during one instance the under drawal by

AP was around 177 MW and Krishnapatnam JV infirm power injection was around 400 MW.

As stressed earlier, APSLDC/TGSLDC should control the under drawal to ensure

Krishnapatnam injection.

6.2.3 DE, APTRANSCO informed that since the SLDCs had been divided recently, there were some

scheduling issues due to software related problems. During Telangana surrender, there was

lesser flexibility of backing down of Hydro generation for controlling the scheduled drawal from

ISTS since only Upper Sileru was on bars. ED, SRLDC pointed out that AP should back down

thermal generation in such a scenario.

6.2.5 MS I/c, SRPC requested the constituents to kindly adhere to the recommendations

finalized in the Special Meeting conducted on 30th May 2014.

6.3 Reliability Margin fixed for S1-S2 corridor-KSEB

6.3.1 KSEB vide letter dated 12th May 2014 (Annexure- 6C) had stated that since Mettur and

Kudankulam had commenced firm generation, the Reliability Margin for S1-S2 corridor

could be reduced from 400 MW so that the curtailed STOA is restored to KSEB. It was

also requested to suitably revise the RM for the month of June 2014 from 500 MW so

that the approved STOA quantum to KSEB do not get curtailed during June 2014.

6.3.2 It was noted that Reliability Margin (RM) had been revised from 400 MW to 280-295 MW.

6.4 Denial of STOA application on ‘no margin’/Denial of URS/ TTC/ATC declared for

S1-S2 corridor- KSEB

6.4.1 KSEB vide letter dated 15.05.2014 (Annexure-6D) had communicated that there was

denial of STOA applications on ‘no margin’. It was also informed by KSEB that

consequent to the tripping of Ramagundam Unit 5, additional margin was created in the

S1-S2 corridor from 10.05.2014 onwards. KSEB had requested to reinstate the curtailed

STOA for the month of May 2014 and traders were requested to put up the STOA

applications. Subsequently, upon tripping of Talcher Unit 6 on 13.05.2014, ER-SR and

S1-S2 corridors were further relieved. However, the additional request for STOA was not

considered. It was also mentioned in the letter that the request for URS from Jhajjar

(unutilized capacity of NR constituents) was also not considered immediately and only


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100 MW was scheduled from18:00 hrs on14.05.2014 against the KSEB request of 300

MW when there was a clear margin of 150 MW in S1-S2 corridor as per the revision

No.19 of TTC for May 2014 issued by NLDC on 13.05.2014 at 12:30 hrs. It was also

informed that some of the STOA applications were rejected by SRLDC citing ‘rejected

due to line constraints” without mentioning the specific elements that are critically loaded.

Sometimes the corridor availability was not seen considered for power exchange

transactions when margin available through S1-S2 was revised to 250 MW from 100

MW.KSEB also informed in the letter that the above issues had resulted in a shortfall of

4.24 MU of energy in S2 area from 00:00 hrs on 14.05.2014 to 12:00 hrs on 15.05.2014

which led to resort to load shedding and additional utilization of hydro resources.

6.4.2 KSEB vide letter dated 02.06.2014 (Annexure-6E) had sought for clarification regarding

the transfer capability declared for S1-S2 corridor for June 2014 and requested for

upward revision of the corridor STOA through S1-S2 at the earliest so as to enable

utilization of the ISTS capability to the extent possible.

6.4.3 Subsequently, KSEB vide letters dated 09.06.2014 (Annexure-6F) had communicated

about the instances of denial of URS power on 08.06.2014 and 09.06.2014.

6.4.4 DCE, KSEB pointed out that many times the URS power was not being granted even

during lightly loaded condition. He requested that URS power should be allocated to

requesting state immediately considering system conditions at that instant since the

monsoon was less than anticipated.

6.4.5 DGM, SRLDC informed that the margin available on 08.06.2014 and 09.06.2014 had

been given to Power exchange transactions. From 10.06.2014 onwards the margin had

been released to STOA/PX and the same had also been put on NLDC website under

revision 14 on 11th June 2014 due to Talcher Unit V AMP.

6.4.6 AGM, SRLDC informed that with regard to the curtailment procedure, the request of

STOAs to be curtailed before URS power was to be taken up with NLDC.

6.5 Detailed Tripping report to be submitted by MAPS/PSS tuning of generators required urgently as per IEGC

6.5.1 In 95th OCC Meeting, the following had been noted

Oscillations were observed in Raichur-Sholapur 765kV line during tripping of

MAPS Unit 2 at 5:23 Hrs on 06.05.2014 posing threat of grid disturbance.

It was observed oscillation of 0.23 Hz through analog trend of

synchrophasors for nearly 40 to 50 seconds throughout the grid

The oscillation subdued after the MAPS unit tripped.

SRLDC had suggested that to prevent such instances it is very much

essential for reviewing / re-tuning of PSS of all the major generators in the

region. SRPC / CTU were requested for a suitable action plan in this regard

and avail the services of experts if required on urgent basis.

6.5.2 Subsequently, a team of Officers from SRLDC, SRPC & TN had visited MAPS,

Kalpakkam on 20.05.2015 to hold discussions on this issue.


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6.5.3 AGM, SRLDC reiterated the need for reviewing / re-tuning of PSS of all the major

generators in the region.

6.6 Supply of Coal to NTPC-Simhadri (4x500 MW) 6.6.1 NTPC, Simhadri vide letter dated 15.05.2014 (Annexure-6G) addressed to

Director(Technical & Operation), MCL had informed that Simhadri STPS was facing

acute coal shortage with critical coal stock of less than one(1) day’s consumption.

Simhadri is linked to MCL mines only and the supply level from MCL had reduced during

Apr-May 2014 with materialization of 56% only. In the month of April 2014, only 136

rakes were received from MCL(average 4.53 rakes/day) as against the programme for

199 rakes(average 6.2 rakes/day). Also in the month of May 2014, 49 rakes were

supplied upto 15.05.2015(average 3.5 rakes/day). It was also mentioned that due to

short fall in domestic coal supplies in FY 2013-14, Simhadri STPS had not been able to

meet the demand of SR states. During the periods April 13 to July 2013 & October 2013

to December 2013, the units were forced to operate at partial loads resulting in

generation loss of 840 MUs. Also Unit 4 was taken out on reserve shut down for 452.73

hours in the months of October and November 2013 and Unit 2 was also taken on

reserve shut down for 45.62 hours in the month of December 2013 resulting in

generation loss of 248.78 MUs due to domestic coal shortage. Hence total generation

loss due to domestic coal shortage in FY 2013-14 was 1089 MUs. NTPC had requested

MCL to increase coal supply and ensure loading of rakes at MCL mines as programmed

on regular basis.

6.6.2 MS I/c, SRPC requested NTPC Simhadri to furnish the details of coal supply receipts during

the last month to take up with the CEA.

6.6.3 Subsequently, NTPC Simhadri vide letter dated 11.06.2014 had communicated (Annexure-

6H) the details of coal supply receipts for the period 1st April 2014 to 10th June 2014. MS I/c,

SRPC vide letter dated 16.06.2014 (Annexure- 6I) had taken up with CEA for improvement of

coal stock position at NTPC, Simhadri.

6.7 FRC Computations

6.7.1 In 95th OCC meeting, it had been noted that SRLDC may appraise the OCC about the response of other regions for 12th March, 2014 incident. SRLDC was to revert back with NLDC’s view on the following issues:

Considering 40% reserve of generating units similar to NERC methodology, for computing ideal response may not be appropriate in the Indian scenario.

1,000 MW loss may not give adequate frequency change for accurate FRC computations, keeping in view the NEWS grid and this could be raised.

6.7.2 AGM, SRLDC informed that details were yet to be received from NLDC in this regard. He

added that the response in other regions had been discussed in the CERC hearing on

RGMO Petition No. 302/MP/2013 05.06.2014. He expressed concern that the response

in Southern Region was minimal and hoped that there would be higher commitment by

generators/SLDCs in this regard.


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6.7.3 It was noted that this issue would be deliberated in the Special Meeting on RGMO/MVAR

to be held on 23.06.2014. All the SLDCs had been requested to carry out unit wise

analysis on the RGMO instances posted by SRLDC and make presentations.

6.7.4 MS I/c, SRPC informed that participation of CERC staff in the Meeting had been

requested.

6.8 Over Loading of 230 kV Hosur-Shoolagiri line

6.8.1 It was noted that KPTCL was planning alternate arrangements for Yerrandahally which

was likely to be in place by July 2015.

6.8.2 EE, TANTRANSCO informed that higher line loading on Hosur-Shoolagiri continued and

the flow on Hosur-Yerrandahalli was going above 40 MW in certain instances. He

informed that 3rd ICT at Hosur had also been charged. KPTCL should make alternate

arrangements at the earliest.

6.8.3 EE, KPTCL informed that 400 kV Mylasandra SS had been planned as part of alternate

arrangement. Contract had also been awarded however there were some disputes in

land acquisition. Another 66 kV line was also planned. With the commissioning of

Mylasandra SS, the loading on Somanahally-Hosur would get reduced.

6.9 Timely Maintenance/Area of Control

6.9.1 During the deliberations of tripping of 230 kV Neyveli TS II-Bahoor line on 22.03.2014, It

had been suggested that necessary directions be issued for timely maintenance in

Generators switchyard / other STU switchyards. PGCIL would also take up the issue with

the concerned since number of its lines was terminated in other utilities Switchyards. The

area of control should be clearly defined.

6.9.2 SE(O), SRPC informed that the same had been incorporated in Patrolling

Guideline/Protocol and enquired about the actions taken by the constituents/utilities.

6.9.3 PGCIL and NLC stated that the tripping which happened on 22.03.2014 was unforeseen

and clarified that the substation and the line were being maintained as per the norms and

within defined areas of control only.

6.9.4 PGCIL and STUs were suggested to issue necessary directions for timely maintenance

in generator switch yard/other utilities switch yards and the area of control should be

clearly defined.

6.10 Implementation of URTDSM (PMU) project in Southern Region

6.10.1 It was noted that nomination of coordinators from constituents for smooth implementation


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of URTDSM (PMU) project in Southern Region had been received by most of the

constituents. It was requested all the constituents/utilities the nomination of coordinators

wherever due needed to be expedited.

6.11 Non-availability of NLC-TS II Real Time data

6.11.1 In the 95th OCCM SRLDC vide letter dated 22.04.2014 had informed that there were

about 18 measurands (telemetry) of Neyveli TS – II which are not updating and it was

informed by NLC that transducers are faulty. Quoting IEGC Clause 4.6.2, SRLDC

requested NLC (as a user connected to Grid) to address the issue and make reliable

telemetry to SRLDC for better grid operation. It was also noted that PGCIL was claiming

O&M expenses for ULDC and it was to be ascertained whether the above works were

under scope of PGCIL

6.11.2 AGM, SR-II, PGCIL informed that 18 Nos. of RTUs/transducers were required at NLC II

station and the procurement of spares was under progress by ULDC wing as all the

spares exhausted.

6.11.3 It was requested that PGCIL may expedite procurement and handing over the spares to

NLC. AGM, SRLDC stated that the real time availability of data should be ensured at the

earliest.

6.12 Providing DC Current Blocking Devises for 3rd 500 MVA ICT at Hoody station and for 1st , 2nd & 3rd ICTS in 400 kV Nelamangala Station.

KPTCL vide letter dated 11.04.2014 had informed that during GRM operation for

harmonic measurements done on 13th July 2013 a very high humming noise was

observed in ICT 1 & 2 at Nelamangala 400 kV S/S and the vibration level of the

transformers was also more. KPTCL had requested Powergrid SRTS II to kindly make

arrangements to provide DC Current Blocking Devices for 500 MVA, 3rd ICT at Hoody

substation and for 1st , 2nd & 3rd ICTS in 400 kV Nelamangala Station at PGCIL. PGCIL

had stated that GRM operation was limited and was further being restricted to 150 MW.

Therefore there was no need to provide DC current blocking devices.

OCC noted the above.

6.13 Usage of Bus Reactor at LANCO for Voltage Regulation

6.13.1 A Meeting was held at SRPC, Bangalore on 21st April 2014 regarding the usage of bus

reactor at LANCO for voltage regulation.


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6.13.2 CM, SR I, PGCIL informed that the SEM at LANCO had been installed on 10.06.2014.

6.13.3 LANCO and SRLDC were requested to kindly expedite taking the reactor into service at

the earliest.

6.14 Frequent tripping of Vallur-Kalivanthappattu & Vallur-Almathy line

6.14.1 In 95th OCCM, the issue regarding frequent tripping of 400 kV Vallur- Kalvinthapattu 1 &

2 and 400 kV Vallur – Almathy 1& 2 due to heavy pollution/fog was deliberated. A

Meeting was held on 19.05.2014 at NTECL Vallur and number of action points were

finalized.

6.14.2 CM, SR I, PGCIL informed that the dates proposed in Meeting held on 19.05.2014 for

replacement of insulators were postponed by one week due to bad weather conditions.

6.14.3 TANTRANSCO was requested to allow PGCIL to avail shut down for replacement of

insulators as per the request of PGCIL as huge manpower was being mobilized.

6.14.4 MS I/C SRPC requested the concerned constituents to kindly expedite action in

accordance with the recommendations finalized in the Meeting held on 19.05.2014.

6.15 Sudden changes in Load in the SR grid

6.15.1 SRLDC vide letters dated 14.05.2014 and 23.05.2014 had communicated to all the

states the instances of sudden load change over under violation of the Clause 5.2(j) of

IEGC and requested to take necessary measures in this regard.

6.15.2 AGM, SRLDC stated that the issue of sudden change in drawal pattern to extreme level

was being continuously taken-up under IEGC clause 1.5 but the improvement of

situation was not to the desired level. He also added that during load changeover, it was

observed the drawal deviation vary between – 300 MW to +300 MW in many instances.

Proper implementation of ADMS and staggering of loads was essential to avoid sudden

changes in load. In the absence of effective RGMO / FGMO, the changeover impact was

getting reflected in inrush of flow on critical lines and was posing threat to security of the

grid. Therefore, the constituents were requested to kindly ensure strict compliance of

IEGC by ensuring the changes not more than 100 MW and also to ensure smooth load

changeover in a staggered manner to avoid sudden changes. In case, the situation did

not improve to the mandated level, SRLDC may be constrained to approach Hon’ble

CERC in this matter.

6.15.3 SRLDC also pointed out that AP & TN were under drawing at times and over drawing of


21

the range of plus or minus 400 MW causing sudden changes within few minutes.

6.15.4 SRLDC/SRPC reiterated that during the Meeting held on 30.05.2014, AP had been

asked not to underdraw for facilitating infirm injection by Krishnapatnam. However, it is

observed that AP was significantly underdrawing during infirm power injection by

Krishnapatnam. Therefore AP/Telangana were suggested not to under draw significantly

else SRLDC would be forced to limit infirm injection.

6.15.5 MS I/c, SRPC requested all constituents to initiate necessary measures to avoid the

instances of sudden load change over.

6.16 Upcoming LGBR and Transmission Scheme details

6.16.1 In the 24th SRPC meeting held on 15th March 2014 SRPC Secretariat was to present

‘Big Picture’ of the upcoming LGBR and Transmission issues. In this regard the details of

Status of Transmission schemes along with forest clearance/ROW issues etc, comments

on Draft LGBR for upcoming 5 years (Draft available on SRPC website), comments on

Operational feedback on transmission constraints for the last quarter (January –March

2014) and future expected constraints in SR Grid submitted to CEA, CTU & CERC by

NLDC were still awaited from most of the constituents.

6.16.2 SE (O), SRPC informed that the draft LGBR for upcoming 5 years and the short term

and long term transmission constraints in SR had been prepared by SRPC Secretariat

and were available in the SRPC website. He requested all the utilities to kindly go

through it and furnish the comments, if any, by 23.06.2014.

6.17 Demand Forecast to be displayed at SLDC website

6.17.1 In the 93rd OCC Meeting it had been noted that as desired by MoP and as per decision

taken in the Special meeting held on 18th January 2014 at Hyderabad, SLDCs were to

carry out block-wise demand forecast and make arrangements to ensure that forecasted

15 minute demand graph with the portfolio management be displayed along with the

actual graph (demand met from various sources and load shedding) in each 15 minutes

block. In the 95th OCCM constituents had raised the apprehension about displaying the

block wise demand along-with portfolio management in public domain. Username and

password could be shared with concerned officials to view this information.

6.17.2 It was noted this was requirement of MoP and was needed to be complied.

Apprehensions, if any, in this regard could be raised by Senior Management


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appropriately.

6.18 Low Voltage in Bangalore area/UV Relay

6.18.1 In the earlier OCC Meetings the following had been noted:

• SRLDC had expressed concern about the low voltages in Bangalore area. It was requested that urgent action be taken to improve the voltages in Bangalore area by taking capacitors at sub transmission and distribution level, optimal rearrangement of loads to decrease line loadings etc.

• KPTCL informed that higher management had been apprised of the UV relays requirement. In order to maintain the voltages, they were taking immediate actions and all the circles had been directed to rectify/replace faulty capacitor banks and directives had been issued in this regard.

• KSEB had informed that a scheme to implement the UV relays had been prepared and would be finalized within a couple of weeks. Details would be furnished once the scheme was finalized.

• SRPC and SRLDC had suggested that the specifications mentioned in the NLDC document (Stage I : V < 200 or 198 (IEGC) KV for more than 5 Minutes, Stage II : V < 185 KV for 30 seconds) for GSES be followed in this regard.

• It was noted that the revised list of low voltage nodes in the region could be furnished by SRLDC. This would facilitate constituents to come out with time bound action plan to implement the UV relay scheme. The settings would be reviewed with operational experience.

6.18.2 DGM, SRLDC informed that the nodes at Mysore, Bangalore, Udumalpet, Madakathara,

Palakkad, Kochi and North Kerala were facing low voltages at 400 kV & 220 kV levels.

States should come out with details of low voltage at 220 kV level and below. The

updated list of low voltage nodes is given at Annexure-6J

6.18.3 EE, KPTCL informed that tenders had been floated for procurement of 500 MVAR

Capacitor banks for which budget provisions was also made.

6.18.4 EE, TANTRANSCO informed that 1,005 MVAR of capacitors at distribution level were

under various stages of installation.

6.18.5 DCE, KSEB informed that a proposal for scheme to implement UV relays had been

prepared and put up to their higher management.

6.18.6 AGM, SRLDC requested KPTCL for urgent action to be taken to improve the voltages in

Bangalore area by taking capacitors at sub transmission and distribution level, optimal

rearrangement of loads to decrease line loadings etc. He requested all constituents to

take similar action initiated by KSEB for moving forward. Till such period, all the SR

constituents were requested to make proper demand disconnection in low voltage


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pockets for maintaining good voltage profile. In the absence of both, it may be inevitable

for physical regulatory measures by SRLDC to limit drawal in such low voltage

conditions.

6.18.7 After deliberations, it was concluded to identify the list of feeders that may be suitable for

physical regulatory measures by SRLDC in case of consistent low voltage situation at

specific nodes since there was delay in implementation of Under Voltage Relays which

was IEGC mandated provision. This interim measure of physical regulation may be

implemented till installation of sufficient capacitors / UV relays. SRLDC agreed to submit

the identified feeder list within a month.

6.18.8 All the constituents were requested to give action plan for installation of UV relays by

26.06.2014, else physical regulations may be taken up for system security.

6.18.9 In 93rd /94th OCC meetings, it had been pointed out by SRLDC that Kolar Control Room

was refusing to switch on the filters (capacitors) on being directed by SRLDC in order to

control low voltages in Bangalore areas. SRLDC had suggested PGCIL to switch on the

filter banks at Kolar HVDC when the Kolar bus voltage falls below 395 kV as per the real

time directions of SRLDC as was being done earlier. PGCIL had reiterated that the set

point of capacitor filters were set in 20 kV band in the range 390 – 410 kV. All the logics

were in auto mode and there was no scope for manual intervention. Manual intervention

had earlier lead to failure of number of capacitor bank and manual switching was not

recommended. Issue of changing the range to 395-415 KV would be referred to M/s

Siemens and they would revert back with expert opinion. After deliberations, it had been

decided that a Meeting could be held with HVDC Kolar for better understanding about

the operation of capacitor filter bank.

6.18.10 AGM, SR II, PGCIL informed that the issue regarding changing the range to 395-415 kV

and changing the band of 20 kV to 15 kV had been referred to M/s Siemens. The OEM

had not accepted for the recommended changes. OEM had expressed that there could

be damages to breakers, filters etc at higher level of the band.

6.18.11AGM, SRLDC requested POWERGRID to kindly furnish details of manufacturer’s

response before next OCC. The case needed to be understood at par with generator’s

capability curve, performance possibility etc. This would facilitate to understand/suggest

any modification / additional requirement of software / hardware items that would help

the power system to operate in an efficient manner.


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6.18.12 It was agreed that this issue could be put to TCC/SRPC.

6.19 KKNPP Related Issues.

6.19.1 Special Meeting was held on 12th March 2014 at SRPC Bangalore to deliberate on the

issues related to KKNPP. The following issues had been discussed.

• Implementation of SPS during Tripping of ATS: KKNPP vide letter dated 06.06.2014(Annexure-6K) had informed regarding the manual reduction of generation of KKNPP at 50 MW/Min. It was once again pointed out the scheme of 50MW/min reduction may not be adequate to ensure the unit survival. It was once again requested that KKNPP/NPCIL review the scheme.

• Auto reclose with 11/2 Breaker scheme. SRLDC stated that A/R scheme needs to be implemented before CoD of unit.

• Hot line link between KKNPP and SRLDC: KKNPP had informed that approval for hotline link to SRLDC had been received and the same would be commissioned shortly.

• Communication link between KKNPP and Tirunelveli /Madurai: It was noted that both the links were established.

• SCADA Inputs to be ensured from KKNPP: Regarding the pending SCADA input to SRLDC, alternate method was being studied by KKNPP and they would revert back. SRLDC stated that A/R scheme needs to be implemented before CoD of unit.

• Spurious generation of SPS signal at KKNPP.

• Interpretation of Capability Curve(limiting MVAR absorption to 100 MVAR)

• Status review of changing GT tap position at Kudankulam NPP corresponding to 400

KV & Review of absorption / injection of MVAR.

6.19.2 SCE, KKNPP informed that presently the unit was under shut down and would come

back after 3-4 days. Six tests had been planned at full load generation and would be

completed during the period of 10 days. Subsequent to that there would be mandatory

shut down for 20 days. The unit would likely be commissioned by end July 2014. He

added that that all the possible efforts would be put to ensure the A/R scheme & pending

field inputs. The issue of auto ramp down rate of 50 MW/min for SPS operation was

under discussion with designer and the NPCIL regulator.

6.19.3 Regarding spurious generation of SPS signal at KKNPP, SR II, PGCIL informed that they

had completed the necessary modifications.

6.19.4 AGM, SRLDC requested KKNP to furnish the steps taken for obtaining clarification on

Interpretation of Capability curve (limiting MVAR absorption to 100 MVAR), changing of

GT tap position etc. KKNPP stated that the issues had been taken-up with concerned


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and would revert back soon.

6.19.5 It was noted that Hon’ble CERC had accorded approval for infirm power injection up to

22.07.2014. In case COD was expected beyond that date, KKNPP was suggested to

approach CERC at an early date.

6.20 Collection of data regarding Power Supply to Rural Areas

6.20.1 CEA vide letter dated 09.04.2014 had informed that in the Meeting held at MoP on

09.04.2014 it had been decided to collect the data invariably from DISCOMs in a

simplified format. SRPC vide letter dated 11.04.2014 enclosing CEA letter dated

09.04.2014 had requested that the data in this regard in the enclosed format may please

be arranged to be communicated to SRPC Secretariat at the following E-mail addresses:

[email protected]

[email protected]

Data to be communicated by first week of the month for previous month. .

6.20.2 MS I/c, SRPC requested the constituents to furnish validated data in a timely manner.

6.21 Review of SPS operation in respect of 765 kV Raichur-Sholapur line

6.21.1 In the earlier OCC meeting it was noted that SPS for Raichur-Sholapur line had operated

for overloading of Warda-Parli line in WR and SPS needed to be reviewed. The SPS

which had acted (flow threshold violation, dp/dt, SPS due to line imp.) and its source (i.e.

Sholapur/Raichur, Wardha & Parli) were not discernible. The source and type of signal

initiation was needed to be ensured to SRLDC/Constituents. It was noted that the

proposed revisions/modifications suggested by NLDC in respect of Raichur-Sholapur

SPS had been discussed and approved in the 31st Meeting of PCSC. SRLDC vide letter

dated 20.05.2014 (Annexure-6L) had furnished the load relief during SPS operation.

SRPC vide letter dated 23.05.2014 (Annexure-6M) had requested TANTRANSCO to

normalize the trip links as relief obtained from TN on 14th, 15th & 18th May 2014 was ‘Nil’.

SRLDC vide letter dated 27.05.2014 (Annexure-6N) had brought to non operation of

SPS in TN on 26.05.2014. TANTRANSCO vied letters dated 03.05.2014 & 10.06.2014

(Annexure-6O) had expressed concern over frequent/spurious SPS signal generation. It

was also enquired whether SPS action of SR was for Raichur-Sholapur line overloading

or Wardha-Parli line, was there any operation in WR for Wardha-Parli line , whether SPS

relief in WR has been provided for the overloading of SR lines.


26

6.21.2 AGM, SRLDC stated that synchronizing facility was required at Raichur end of 765 kV

Raichur – Sholarpur line to avoid delay in restoration of vital inter-regional link. Separate

synchronizing facility had to be provided for both the lines by PGCIL at both ends and

requested SR I, PGCIL to appropriately take up the issue. The relief obtained in some of

the instances was not as per expected relief and the same has to be re-looked. On a

query from SRPC for reviewing the SPS operation under export mode, SRLDC clarified

that the operation of SPS was as per approved logic. SRLDC had given feedback to

NLDC in this regard and SRPC could also take up with NLDC.

6.21.3 CM, SR I, PGCIL informed that the process for providing the synchronizing facility had

already been initiated and taken-up with the manufacturer. He added that SPS

modification could not been implemented at Raichur on scheduled date (09.06.2014).

6.21.4 PGCIL was requested to expedite for provision of synchronizing facility and furnish the

status by month end.

6.21.5 It was noted that SPS in SR had been implemented while SPS

implementation/modifications in other regions were pending. SRLDC/NLDC/PGCIL were

requested to coordinate with other regions to complete the same.

6.22 Taking all available Inter-Regional lines into service

6.22.1 Lower Sileru- Balimela line had been tested with two units of Balimela in service.

APTRANSCO had expressed concern that it had taken more than ½ hour for exchanging

the code and for Odisha SLDC to take necessary action. It was noted that as agreed in

the 24th SRPC Meeting, APTRANSCO had agreed for the proposal provided there would

not be any generation loss or demand cut in AP system. It was noted that matter of

keeping the line in to service was pending with some issues on GRIDCO side. SRLDC

had stated that the issues would be taken-up with NLDC / ERLDC for speedy code

exchange implementation as well as address the issues of GRIDCO through ERLDC.

KPTCL had agreed for closing the Chikkodi – Mudsinghi / Tandlade ( Kolhapur) line in

the Special TCC Meeting held on 08.05.2014.

6.22.2 ED, SRLDC pointed out that AP and Telangana were applying for 300 MW of STOA

purchases through GRIDCO, but only 150 MW was being approved. He added that 300

MW may be approved if 220 kV Upper Sileru- Balimela was closed. In the interest of all

the constituents in the region, all the inter-regional and inter-state tie lines should be in


27

service. This would enhance system reliability as well as transfer capability between the

Regions/States. Accordingly, SRLDC requested all possible efforts of AP and Karnataka

TRANSCOs & SLDCs to keep the Upper Sileru – Balimela line and Chikkodi – Mudsinghi

/ Tandlade (Kolhapur) line in service. NLDC was insisting to put all inter regional lines in

service.

6.22.3 DE, APTRANSCO said that Upper Sileru- Balimela line had been tested successfully

with two units of Balimela in service. He expressed concern that it had taken more than

½ hour for code exchange for Odisha SLDC to take necessary action. Minimizing the

code exchange time was necessary for proper operation.

6.22.4 SRLDC assured for review of the process & stated they would take-up with NLDC /

ERLDC for quick exchange of codes. Operational difficulties could be understood/

analysed only if the line was kept in service continuously.

6.22.5 After deliberations, it was noted that Chikkodi – Mudsinghi / Tandlade (Kolhapur) lines

should also be closed at the earliest as agreed in the Special meeting on 08.05.2014.

The technical feasibility of utilizing the lines may be established on immediate basis and

other issues like commercial, legal etc., if any could be considered/taken up

appropriately.

6.22.8 Minutes of the meetings on rejuvenation of Chikodi-Kolhapur (Talandage & Mudshungi)

held on 12th June 2014 are enclosed at Annexure-6P

6.23 Compiled Telemetry status – Utility wise- as directed by Hon’ble Commission

6.23.1 Vide order dated 19.12.2013 on Suo-moto petition No. 56/5M/2013 Hon’ble Commission

had directed all the utilities to provide the required telemetry within six months of this

order. Progress of compliance in this regard by various utilities w.r.t. the report submitted

on 25.09.2013 was compiled and submitted to Hon’ble Commission in March 2014

furnished by POSOCO, a copy of the same was forwarded to SRPC. It was requested

that necessary action to communicate the status of the pending field inputs as well as

action plan/action taken to rectify the same may please be communicated to this office

by 08.04.2014.

6.23.2 AGM, SRLDC pointed out that 3 months time schedule given by Hon’ble CERC was

getting over. It was requested that necessary action to communicate the status of the

pending field inputs as well as action plan/action taken to rectify the same be furnished

within 15 days.

6.23.3 AGM, SR II, PGCIL informed that DCPC for Talcher Stage II data had been installed and

extended to SRLDC end. Only integration works at SRLDC end were pending.


28

6.23.4 UPCL representative informed that they were awaiting for manufacturer M/s Alstom T &

D to complete the pending SCADA inputs.

6.23.5 MAPS and KGS were requested to follow the procedure being followed by KKNPP in

respect of pending SCADA inputs.

6.24 Implementation of RRF Mechanism

6.24.1 In the 22nd TCC Meeting held on 25th October 2013 the following was noted:

States were requested to submit the ‘White Paper’ containing information relating to Pooling Stations, Coordinating Agency etc as agreed in the meeting held on 25th September 2013.

It was also suggested to the States to jointly identify the common issues such as those relating to treatment of schedule during backing down and appropriately take up the same with Implementing Agency/SERC/CERC.

The need for timely submission of data for preparation of RRF account also emphasized.

In the 91st OCC Meeting provisions of CERC Order dated 07.01.2014 in respect of Petition No. 356/SM/2013 were noted.

6.24.2 All the constituents were requested to continue forecasting and scheduling of wind

generation and furnish validated data needed in a timely manner.

6.25 GRM operations of Talcher-Kolar Link

KPTCL had informed that third set of reading was yet to be taken. Forum had suggested

that all the testing should be completed at the earliest and KPTCL should revert back

with the recommendation within specified timeframe.

6.26 Pollution Mapping

6.26.1 Training for all the coordinators had been completed and fitting of insulators was under

progress by all the constituents.

6.26.2 In the meeting SE(O), SRPC reminded that in the meeting at NTECL, Vallur it had been

agreed to put more number of dummy insulators in that area to assess the pollution

levels more accurately. SR I, PGCIL and TANTRANSCO were requested to take

appropriate action.

6.27 Transmission Line Patrolling Protocols/ Guidelines

6.27.1 Transmission Line Patrolling Protocols/ Guide Lines had been furnished to Hon’ble

CERC vide letter dated 21.05.2014. Communication has been addressed to the

constituents vide letter dated 21.05.2014 for implementation/necessary action.


29

6.27.2 It was noted that Transmission Line Patrolling Protocols/ Guide Lines were to be

followed. Categorization of the lines had to be done and monthly compliance report of

the Patrolling is required to be furnished. SE(O), SRPC requested the constituents to

revert back with details.

6.28 NPC related Issues

6.28.1 Implementation of measures to prevent Grid Disturbance

A. Third party Protection Audit

i. In 94th OCC Meeting, MS I/c SRPC had reminded that as per Order of Hon’ble

CERC in respect of Petition No. 146/MP/2013 with I.A 36/2013, Phase I

activities were to be completed by 01.05.2014. He had requested the

constituents to put all the efforts to ensure compliance. He had requested them

to furnish status as on 01.05.2014 to SRPC/SRLDC within one week after

CERC timeline and also status of implementation of phase II activities to be

communicated to SRPC/SRLDC on bi-monthly basis.

ii. Subsequently SRPC vide letter dated 10.04.2014 & 30.04.2014 had taken up

the issue with all the utilities for Status update of Phase I & Phase II activities.

iii. In 95th OCCM, SRLDC pointed out that in the compliance report submitted by

the states for CERC compliance, constituents had indicated status as ‘

Tendering in Process’ / ‘Items to be procured’ etc., This nature of indication of

status does not show any time line / type of tendering / important or urgency

attached by the constituents / commitment of constituents for compliance.

Therefore, all the constituents were requested to indicate the break-up details

of individual activities involved in a particular recommendation with target time

schedule of completion.

iv. EE, TANTRANSCO had stated that as the issue was having commercial

implications and involve other protection wings, generating stations etc it would

be better to call separate meeting.

v. AGM, SRLDC opined that as the progress of implementation of many items of

Enquiry committee recommendations including Protection Audit findings were

almost ‘Nil’ and it would be better to conduct a separate meeting for discussing

the progress of implementation.


30

vi. It was noted that as per CERC order, phase-I activities were to be completed

by 01.05.2014 and phase-II activities were to be completed within a specified

time schedule and the status was to be communicated to SRPC/SRLDC

bimonthly. It was decided that a separate meeting could be held in this regard

in which all the constituents were to come up with specific details like tendering,

time schedules etc.

B Reactive Power Planning

i. In the 23rd SRPC meeting held on 26th October 2013, Utilities had agreed to

furnish the schemes relating to Reactive Power Planning including at

distribution level within one month. The time schedules for implementation

would also be indicated.

ii. It was requested that all the constituents may furnish the schemes relating to

Reactive Power Planning including at distribution level.

.

C Ensuring proper functioning of UFRs and df/dt relays

i. In the Second NPC Meeting, it had been decided that all SLDCs and RLDCs

would upload the details of feeders to be tripped through the UFRs and the

expected load relief at different frequency levels in their respective

States/Regions on operations of UFRs. It was also decided that RPCs would

send inspection report of healthiness of UFR and df/dt regularly on a

quarterly basis to NPC Secretariat.

ii. It was noted that as per CERC orders, certified relief quantum by SRLDC

and SRPC had been furnished to the constituents. Observations in this

regard had also been communicated earlier. Subsequently vide letter dated

23.04.2014 compliance report in respect of the following certified by SRLDC

and SRPC was communicated to CERC:

Status of the additional identified loads which were to be implemented

Status of additional loads to be identified and implemented

Status of SCADA mapping and the action plan to achieve 100 %

mapping

iii. SRPC vide letters dated 22.05.2014 & 04.06.2014 (Annexure-Q ) enclosing

copies of letters dated 16.05.2014 & 27.05.2014 received from SRLDC


31

furnishing the observations(SCADA visibility/Relief) for the period 01.05.2014

to 10.05.2014 and 11.05.2014 to 20.05.2014 had forwarded to all the

concerned. It was requested that the matter may kindly be arranged to be

examined urgently and remedial action arranged so that the available relief is

in line with the declared relief.

iv. MS I/c, SRPC informed that the compliance report duly certified by SRPC

and SRLDC had been submitted to Hon’ble CERC. He requested all the

constituents to implement the additional feeders in order to make the

declared relief available and also to achieve 100% SCADA mapping to

SRLDC.

v. AGM, SRLDC mentioned that the time schedule granted by Hon’ble CERC

vide direction on petition no. 263 / MP / 2013 for implementation of AUFR

and df/dt for the quantum decided by SRPC & ensuring visibility to SRLDC

SCADA was already over. Despite regular follow up, there was significant

backlog by all the SR constituents. Only KSEB had approached CERC

seeking time extension with detailed action while other constituents had not

responded with any details on status of implementation. The scenario

amounts to non-compliance of directions of Hon’ble Commission and all the

constituents were requested to appraise the Hon’ble Commission urgently.

vi. SRLDC stated that only APSLDC had created a monitoring table in their

SCADA while all the other SLDCs also need to create such monitoring table

in their SCADA. The details are to be regularly monitored by the respective

SLDCs. The same table may be mapped to SRLDC SCADA system.

vii. It was noted that there was no improvement in the quantum connected /

mapped with SCADA. All the constituents were requested to ensure that the

quantum available for relief be as per the SRPC recommended value and

mapped in SCADA for monitoring as per the CERC order.

viii. Andhra Pradesh and Telangana SLDCs were requested to segregate the

feeders of the Andhra Pradesh and Telangana. Subsequently SRPC had

communicated (Annexure- 6R) the quantum to be provided by Andhra

Pradesh and Telangana under UFR and df/dt and the ratio for other

protection schemes. Andhra Pradesh and Telangana were requested to

submit the details to SRLDC and SRPC on urgent basis.


32

D Islanding schemes

It was noted that all the works related to Islanding schemes were completed. .

6.28.2 Reporting the Status of implementation of the recommendations of the Enquiry

Committee

6.28.2.1 All RPCs are requested to update and forward the status of implementation of

recommendations of the Enquiry Committee on Grid Disturbances on 30th and 31st

July 2012 to CEA in the prescribed format on fortnightly basis regularly i.e. the status

as on last day of the month to be forwarded by the 3rd day of the following month and

that as on 15th of the month to be forwarded by 17th of the month. All members agreed

to submit the above information on fortnightly basis through RPCs.

6.28.2.2 MS I/c, SRPC requested all the constituents to update and forward the status in a

timely manner.

6.28.3 Review of Zone 3 Philosophy

It was noted that the issue had been deliberated in Protection Sub-Committee

Meeting held on 21st November 2013 and settings for critical 400 kV lines had been

finalized for implementation.

6.28.4 Ring Fencing of Load Dispatch Centers

In the Meeting, it was reminded that the status report on this was to be submitted

every month to the NPC Secretariat. The report had not been received from any of

the SLDCs/Transcos. It was requested to kindly submit the status updates in a timely

manner.

6.28.5 Implementation of CEA Regulation

6.28.5.1 In 23rd SRPC Meeting held on 26th October 2013, the following had been noted:

TCC had suggested that CEA be kindly requested to send its Officers to the RPC

forum to help improve awareness of the Regulations through Workshops,

Seminars etc.

Chairperson, SRPC had opined that increased awareness could be created in

this Workshop, during which the experts go into issues threadbare.

6.28.6 Number of Stages for AUFLS

All the four stages (49.2, 49.0, 48.8 & 48.6 Hz) of UFR had been implemented in


33

Southern Region.

6.28.7 Methodology for determination of quantum of load for AUFLS in different

region.

6.28.7.1 Based on the communication received from CEA vide letter dated 6th August 2013,

State-wise Break-up of the UFR quantum to be provided at each stage had been

agreed for implementation.

6.28.7.2 In the 95th OCCM, SRPC informed that revised computations had been worked based

on 2013-14 data .Since there was only minor shifting among the constituents, the

forum agreed for existing quantum till further directive from NPC.

6.28.8 Implementation of Demand management Scheme (IEGC 5.4), Grid Security Expert System and Demand Estimation

Hon’ble CERC vide order dated 20.02.2014 had passed orders for monitoring of

parameters for 6 months before considering the GSES scheme.

6.29 Generation level at RTPS Unit VIII

KPCL informed ESP related works were going on and the unit was likely to achieve

full load by July 2014.

6.30 Energy Generation data Management from Renewable Energy Sources

6.30.1 Energy Generation from RES connected to Grid is being collected by CEA from

SLDCs from April 2012 onwards. It had been decided that CEA would bring out a

monthly report of RES containing data of generation in MU from RES Month-wise,

State-wise, Sector-wise and Category-wise etc including details like Peak Generation

from RES, time of occurrence etc. Action taken w.r.t to Minutes of the meeting held on

8th November 2013 was awaited (Minutes annexed with 90th OCC minutes).

6.30.2 MS I/c, SRPC observed that despite repeated reminder/follow ups there was no

status update from any of the constituents. He requested that the constituents to

furnish the status by next OCC. He suggested that the SLDCs may obtain the inputs

from concerned division.

6.31 Upcoming Generating Stations

6.31.1 In earlier Meetings, it was noted that scheduling of infirm power of KKNPP had

commenced from 1300 hrs of 21st January 2014.

6.31.2 SCE, KKNPP informed that the Unit had achieved 1000 MW on 07.06.2014 at 1320


34

hrs.. Presently the unit was under shut down and would come back after 3-4 days.

Six tests had been planned at full load/partial generation and would be completed

during a period of 10 days. Subsequently there would be mandatory shut down for 20

days. The unit was likely be commissioned by July 2014.

6.31.3 DGM, NLC informed that the Unit-1 NLY TS2 – Expansion had been synchronised

with the grid and the generation level had gone upto 150 MW. Presently the unit was

out because of economiser tubes puncture. BHEL had planned minor modifications ,

and the report was awaited.

6.31.4 DGM, NTECL, Vallur informed that the CoD of Unit III of Vallur TPS was expected

by August 2014.

6.32 Islanding Scheme: Priority for Railways in the matter of Restoration of Supply

6.32.1 Four Special meetings had been held in this regard on 23.07.2013, 23.09.2013,

22.11.2013 & 12.02.2014. Minutes of the meeting held on 12.02.2014 are available

at http://www.srpc.kar.nic.in/website/2014/meetings/special/mnsm-cmp-12-02-

14.pdf.

6.32.2 In 95th OCCM, SRLDC pointed out that all the SLDCs had finalized the Operating

procedure with respect to traction feeders except Karnataka SLDC It had been

requested that KPTCL may finalize the same immediately. It was noted that KPTCL

had furnished the draft to Railway/BMRCL for comments.

6.32.3 EE, KPTCL informed that the operating procedure with respect to traction feeders

had been finalized and would be notified soon.

6.33 ATS for Mettur Stage II and North Chennai Stage II

6.33.1 The issue regarding over loading of lines of Kolar - Hosur and SV Chatram-

Puducherry lines, load generation balance in Chennai area and associated

transmission/generation evacuation issues had been deliberated in various forums

of SRPC

6.33.2 TANTRANSCO vide letter dated 24.05.2014 (Annexure-S) had stated that the

commercial operation of the 600 MW NCTPP, Stage II (Unit II) has been declared

on 08.05.2014.

6.33.3 MS I/c SRPC stated that decisions taken in the Special TCC Meeting held on

08.05.2014 and Special meeting held on 30.05.2014(in which CEA and CTU had


35

also participated) were needed to be adhered.

6.33.4 TANTRANSCO/PGCIL informed about the status/ commissioning dates of

transmission elements as below:

Tiruvalam-Melakottiyur(PGCIL): July 2014.

Pugalur-Kalavindapttu(TANTRANSCO) : Almost complete. PGCIL bay works

by month end.

Mettur-Singarpettai-Tiruvalam(TANTRANSCO): Work awarded stage.

Almathy-Tiruvalam (TANTRANSCO): July 2014.

Tiruvalam SS and downstream system (TANTRANSCO) : Would revert back.

6.33.4 TANTRANSCO and PGCIL were requested to ensure that the projects are

expedited and there is no further delay.

6.34 Reconciliation of schedules within the same shift by Regional Entities.

AGM, SRLDC informed that they had been receiving letters daily from constituents

regarding difference in final schedule and implemented schedule (uploaded next day

of operation). To avoid the discrepancy in the implemented schedule, it would be

better to reconcile within same shift on the day of operation. To minimize the post

facto changes he requested co-operation of all the constituents for re-conciliation of

schedule in each shift.

6.35 Over loading of 400 kV/765 kV lines

6.35.1 All the constituents were requested to take appropriate actions to avoid over loading

of Kolar - Hosur, Raichur - Sholapur and Nagarjunasagar - Cuddapah lines by

maintaining their LGBR, restricting their over drawal/under drawal and adhering to

SRLDC instructions.

6.35.2 TANTRANSCO vide letter dated 29.05.2014 (Annexure-6T) had informed that on

22.05.2014 and 23.05.2014 during peak hours SRLDC had requested Tamil Nadu to

remove the Kadamparai pumps to avoid overloading of the 400 kV Kolar-Hosur

feeders. TANTRANSCO had requested that SRLDC may approach these kind of

issues uniformly without any disparity.

6.35.3 It was pointed out that such restrictions were not being imposed during normal grid

operating conditions. Only during over loading of 400 KV Kolar-Hosur and SV

Chathram- Puducherry and improper load generation balance in Chennai area such


36

instructions were being issued in the interest of the security of the Grid. It was also

pointed out that such provisions had already been advised by Hon’ble CERC in its

order on Petition No. 167/Suo-Motu/2012(Grid Disturbance) .

6.36 Charging/Synchronizing of elements without intimation to SRLDC

6.36.1 It was noted that Hoody ICT had been charged by KPTCL without exchanging code

from SRLDC.

6.36.2 EE, KPTCL informed that the switching was done on emergent basis and SLDC had

communicated to SRLDC immediately after the operation.

6.36.3 AGM, SRLDC pointed out that Charging/Synchronising of elements without intimation

to SRLDC should not be done except in case of emergencies as defined in IEGC. For

such instances that warranted switching operation without waiting for consent of

SRLDC, detailed report explaining the situation, EL&DR printouts, etc. needed to be

submitted by the respective constituent within 24hours of the instance. However, in

the instance of Hoody ICT synchronization, no such details had been received from

KPTCL so far which was a matter of concern. KPTCL was requested to submit the

detailed report in the specified instant on immediate basis.

6.37 Tripping of MAPS Unit due to sudden dip in Grid Frequency

6.37.1 On 22nd May 2014 at 1308 hrs both the units of MAPS went on House Load operation

due to sudden dip in grid frequency resulting in loss of 230 kV Grid supply. MAPS

vide letter dated 06.06.2014 (Annexure- 6U) had requested for discussion on this

issue in the 96th OCC meeting.

6.37.2 OS, MAPS informed that on 22.05.2015 at 13.08 hrs both the units of MAPS came on

house load mode of operation due to sudden dip in grid frequency and 230 kV

connectivity was completely lost. He expressed concern over the weak connectivity

(due to number of elements being taken out/split bus operation) from nuclear plant

and which had caused 3 days of generation loss from one unit. He requested the

forum to discuss the reasons for dip in frequency resulting in tripping of the units at

MAPS and also to finalize remedial actions.

6.37.3 SRLDC informed that TN had not furnished SOE & detailed report about the incident

(within 24 hours) which was still awaited. SRLDC observed that keeping some of the

230 kV lines out and clearing outage without satisfying N-1 criteria in STU network


37

had led to islanding of MAPS unit. Also, lack of appropriate demand management

prior to availing outage had led to non-surveillance of islanding condition and thus it

had endangered system security.

6.37.4 EE, TANTRANSCO informed that on that day 400 KV Vallur-Kalvindapattu lines were

under shut down and MAPS- Acharapakkam lines were in open condition. Upon

tripping of Sriperumbudur- Arni feeder, there was a mismatch of load and generation

in the island which was formed due to tripping. This had resulted in dip in frequency.

6.37.5 OS, MAPS pointed out that they were not aware of outage of MAPS-Acharapakkam

line and MAPS was operating with depleted network. He expressed that it was a

matter of serious concern that tripping of one line had led MAPS unit outage.

6.37.6 It was noted that many 230 kV lines were being kept opened in MAPS area viz SP

Koil- Thiruvalam, Arni- Singarpet, Acharapakkam-Villupuram and Tiruvalam-Mosur

by TANTRANSCO.

6.37.7 EE, TANTRANSCO stated that they were taking care to avoid such incidents in future.

6.37.8 After deliberations, OCC recommended that a Committee consisting of officers from

SRPC, SRLDC, MAPS and TANTRANSCO be formed to study the incident. The

committee would come out with detailed analysis and finalise recommendations to

avert such instances in future.

6.38 TANTRANSCO- Curtailment of MTOA (160 MW) to Tamil Nadu on 30.05.2014.

6.38.1 TANTRANSCO vide letter dated 30.05.2014 (Annexure-6V) had informed that on

30.05.2014 SRLDC had curtailed MTOA transaction of Tamil Nadu from 0730 hrs

onwards by about 160 MW stating ATC flow gate restriction/Pondy-Suguvachathram

shutdown.

6.38.2 EE, TANTRANSCO said that in real time the flows were within limits on S1-S2 flow

gate and the curtailment should have been carried out judiciously.

6.38.3 SRLDC vide letter dated 05.06.2014 (Annexure-6W ) had replied to TANTRANSCO

on this issue. It was clarified that the curtailment of MTOA of about 160 MW was done

assuming full generation at NCTPS as assessment of load generation balance. DGM

SRLDC pointed out that 650 MW curtailment was envisaged during the 400 KV SV

Chatram-Puducherry shut down approval in the OCC.

6.38.4 ED SRLDC said that after assurance by TN that North Chennai generation would be


38

maintained below 200 MW, MTOA had been restored at 1100 hrs.

6.38.5 It was noted that such changes in load & generation needed to be informed by the

respective utilities to SRLDC as early as possible to ensure judicious decision making

by SRLDC.

6.39 Gradation of settings for over voltage protection for new feeders at Hosur and Tiruvalam 400 kV sub stations.

6.39.1 PGCIL, SR II letter dated 02.06.2014 (Annexure-6X ) for gradation of over voltage

protection settings for new feeders at Hosur and Tiruvalam 400 kV SS.

6.39.2 SE (O), SRPC informed that the proposed settings were furnished to constituents by

E-mail for all the lines where there were changes in network configurations for

comments. All the constituents were requested to revert back on the suggested

settings by month end.

6.40 Connectivity for Kudankulam NPP Unit 3&4 with ISTS

6.40.1 NPCIL vide letter dated 19.05.2014 (Annexure- 6Y ) had requested for review of the

connectivity of Kudankulam NPP Unit 3&4 with ISTS.

6.40.2 It was noted that this issue would be dealt by Transmission Planners CEA and CTU.

6.41 Addressing the prolonged issues in an effective manner

AGM, SRLDC had suggested that any issues which could not be converged /

consensus could not be evolved / implementation progress could not be seen and

etc., even after deliberating in more than three OCCs be escalated to senior level

forum and subsequently to forum like CERC/ SERC etc., to ensure appropriate

solution for such issues and proper implementation. It was mentioned that

implementation of many of the mandated / CERC directed items are having significant

deviation and to make better monitoring system a table of such items may be included

in the minutes of meeting.

6.42 Snapping of power conductors over traction lines- Sothern Railway 6.42.1 Southern Railways had raised the issue of snapping of earth conductor in KSEB

system between Kazhakuttam-Kochuveli stations on 25.05.2014 and snapping of

TANTRANSCO 230 kV NCTPS-ETPS phase conductor crossing Railway traction

lines of all four tracks between Ennore-Attippattu on 18.04.2014 at about 1003 hrs.

6.42.2 DCEE, Southern Railways informed that the matter had been taken up with KSEB and

TANTRANSCO at Chairman level vide letters dated 26.05.2014 and 22.04.2014

(Annexure-6Z ) respectively. He informed that in case of TANTRANSCO the fallen


39

wire had caused permanent earth fault and had resulted in snapping of catenary on

down line and damage to traction conductors on up line and third line. It appeared that

the failure was due to conductor melting and snapping at jumper clamp point near

termination tower. In case of Kerala it took 2.20 hrs for restoration. He requested for

timely maintenance of power line crossings to ensure healthiness by periodic

inspections. He informed that they were planning for guarding for all power line

crossings.

6.42.3 DCE, KSEB pointed out that Kerala SLDC was not aware of this issue. EE,

TANTRANSCO informed that when TANTRANSCO officials approached Railways for

maintenance of snapped conductor, some administrative/commercial

issues/procedures had been raised by Southern Railways and the procedure had

taken more than 3 days.

6.42.4 ED, SRLDC pointed out operational matters should not be linked with the commercial

matters.

6.42.5 EE, KPTCL informed that they were using cables for traction crossings at many

locations. Double tension/double clamps were being used for traction crossings.

6.42.6 MS I/c, SRPC stated that this type of operational issues should be intimated in

advance to OCC forum so that it can be included in Agenda. He pointed out that even

there was no communication to SLDCs.

6.42.7 Railways were requested to give such type of operational issues in advance for fruitful

deliberations. It was also pointed out that the Railways should allow restoration of

lines at the earliest and commercial matters could be settled subsequently. For

restoration hot line was available between SLDCs and TPCs which could be utilized

for expediting the works. The TRANSCOs were requested for periodical

inspections/timely maintenance of line crossings railway traction lines. SLDCs were

requested to give similar instructions to DISCOMs.

6.43 Lower Schedule to UPCL

6.43.1 UPCL vide letter dated 09.06.2014 (Annexure-6AA) had informed that for last few

days UPCL had been instructed by SLDC to run the station at 600 MW against

their DC of 1110 MW..UPCL had expressed concern that running the units at

lower levels was adversely affecting the health of the units and there were

commercial implications also.

6.43.2 EE, KPTCL said that the management was aware of the issue and requested

UPCL to take up the issue appropriately.


40

6.44 Integration of New elements into Grid:

SRLDC vide letter dated 26.05.2014(Annexure-6AB) had circulated the Draft

Procedure for integration of new elements of a transmission licensee into the grid

and issuance of certificate by RLDC for successful trial operation of a transmission

element to CERC.

7.0 GRID FREQUENCY

7.1 High frequency

7.1.1 High Frequency Grid Operation

It was noted that the Regional Grid had operated above IEGC range i.e. 50.05 Hz

for 21.58 % of the time. It was also noted that the frequency on some of the days

was higher for considerable periods as shown below:

Date

Percentage of time of

frequency

50.05 Hz

&< 50.2 Hz

More than

50.2 Hz

01.05.2014 20.63 5.97

04.05.2014 27.01 7.36

08.05.2014 22.36 7.64

13.05.2014 25.69 9.17

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

7.1.2 High frequency excursions w.r.t. 5.2 (j) of IEGC during load change over and

remedial measures to arrest such instances

7.1.2.1 Summary of statement of instances of sudden Change in Demand above 100 MW

given by SRLDC is at Annexure- 7A

7.1.2.2 Summary of deviation statement on UD/OI by States/Stations and Max MW when

frequency was >50.05 Hz is at Annexure-7B.

7.1.2.3 SRLDC pointed out that this issue was regularly being followed up and requested 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.


41

Proper load management to prevent the sharp rise in frequency.

Implement ADMS

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

Planned and advance intimation for surrender of ISGS.

7.1.2.4 In the earlier OCC Meetings, all the SLDCs (AP, KAR and TN) had been

requested to furnish the load change over details along with timings and

quantum to SRLDC/SRPC. The issue of simultaneous change over by the state

utilities would be studied and recommendations would be identified. It was also

suggested that SLDCs may conduct regular meetings with the DISCOMs to

ensure that the staggering is implemented effectively. It was noted that APSLDC

had conducted 3 to 4 meetings with DISCOMS regarding the load staggering

(grouping of loads) within/across DISCOMS and minimize the effect on Regional

Grid. It was requested other constituents may carry similar exercise as in

APSLDC.

7.1.2.5 AGM, SRLDC expressed serious concern that for a particular instant t despite taking

up for more than half an hour, AP was in continuous under drawl. On many

instances, similar approach has been found with other constituents too and

messages were issued from SRLDC control room. Co-operation of all the

constituents was requested to strictly avoid such instances.

7.2 Low Frequency

7.2.1 It was also noted that the frequency of grid operation was at times in the lower

range of IEGC. The grid had operated below IEGC range i.e 49.90 Hz for 26.88% of

time. It was also noted that the frequency on some of the days was less than 49.9

Hz for significant duration as shown below:

Date

Percentage of time of frequency

<49.2 Hz 49.2 Hz&

<49.5Hz

49.5 Hz &<

49.7 Hz

49.7 Hz &<

49.8 Hz

49.8 Hz &

< 49.9 Hz

16.05.2014 0 0.07 5.97 18.26 33.54

17.05.2014 0 0.14 7.08 18.06 24.10

18.05.2014 0 0 7.71 21.74 31.74

19.04.2014 0 0 5.90 19.17 34.58

20.04.2014 0 0.21 1.67 13.26 34.03


42

7.2.2 AGM, SRLDC stated that proper demand side management measures had to be

initiated by the constituents to curtail low frequency operation. Summary of violation

messages to Beneficiaries and Generators are furnished at Annexure-7C and

Annexure-7D respectively. He also informed that deviation messages were being

issued based on the actual under drawal / overdrawal. Based on the directions from

NLDC the frequency correction factor would be incorporated for working out net

under drawal and over drawal values and the deviation messages would be issued

on net UD/net OD only.

7.2.3 EE, APTRANSCO informed that load shedding around 558.76 MU up to 4,243 MW

had been carried out in AP. Bilateral Purchases of more than 1,176 MU had also

been made from other states/regions/MPPs. There was three hours (in two spells,

1½ hour each) scheduled load shedding in Hyderabad, Thirupathi, Vizag &

Warangal. Three hours (two spells, 1½ hour each) scheduled load shedding in

Corporations and District Head Quarters, Four hours (two spells, two hour each)

Scheduled load shedding in Towns and Municipalities and 6 hours scheduled load

shedding in Mandal HQs throughout the month. One day power holiday per week

was also implemented for Industries upto 08.05.2014 which was reduced to half a

day during 09.05.2014 to 13.05.2014 and from 14.05.2014 the power holiday had

been lifted. Lighting supply from 6 PM to 6 AM and day supply along with

agricultural supply was being given to the rural areas during May 2014.

7.2.4 EE, KPTCL informed that load shedding around 369 MU up to 1,100 MW had been

carried out in Karnataka. Bilateral Purchases of around 54 MU were also made from

other States/Regions.

7.2.5 DCE, KSEB informed that load shedding around 36 MU up to 580 MW had been

carried out in Kerala. Bilateral Purchases of more than 258 MU were made from

other States/Regions. He informed that from 22.05.2014, ½ hour cyclic load

shedding had been imposed during evening peak on Northern and Southern parts of

Kerala on alternate days.

7.2.6 EE, TANTRANSCO informed that load shedding around 292 MU up to 2,019 MW

had been carried out in Tamil Nadu. Bilateral Purchases of around 400 MU were

made from other States/Regions. Scheduled load shedding in Chennai had been

continuing at two hours (in two spells between 0800 to 1800 hrs) and 3 hours

(between 0600 to 1800 hrs) for Urban and Rural areas. 20% & 90% cut on base


43

Demand and Energy consumption in respect of HT Industrial and Commercial

consumers during day time and evening peak hours had been continuing from 1st

October 2013.

7.2.7 MS I/c, SRPC requested the constituents to plan the Load Generation Balance

block-wise to avoid any operation below 49.9 Hz.

7.2.8 SRLDC presented the Frequency Histogram & Frequency Duration Curve

(Annexure-7E) for May 2014. It was observed that the Frequency Duration Curve

for May 2014 was in between May 2013 & April 2014 for 30 % of the time and rest

of the time it was above to both May 2013 & April 2014.

8. VOLTAGE PROFILE

8.1 Low voltage

8.1.1 It was noted that the following nodes were facing low voltages:

Station Min Voltage

in kV

Average duration in minutes per day when V <390 kV

Bangalore 369 478

Trichur 367 320

Palakkad 367 143

Udumalpet 380 201

Cochin 369 226

Trivandrum 379 53

8.1.2 States were to provide Under Voltage relays in some of the low voltage nodes in

their control area (List would be furnished by SRLDC). In earlier OCC it had been

noted that Installation of under voltage (U/V) relays was agreed in principle by the

constituents in the SRPC meetings. SRPC & SRLDC had desired that some written

communication needed to come from states regarding implementation progress of

the U/V relays.

8.1.3 Installation of Shunt Capacitors

Sl.No. Description AP KAR KER TN Pudu Total

1. Total Installed as on 30.05.2013

6622.20 4484.324 995.00 3590.41 77.017 15768.951

2. Additional Requirement * during 2013-14

26.2 56.31 10.00 122.4 -- 214.91


44

3. Actual Addition during 2014-15 up to 30.05.2014

0.00 0.00 0.00 0.00 0.00 0.00

4. Balance 26.20 56.31 10.00 122.4 0 214.91

* Carry forward for earlier years

8.1.4 SRLDC requested that installation of Under Voltage Relays should be done on

priority without further delay. Also, installation & ensuring healthiness of capacitor

banks at distribution level shall be ensured by all the constituents. SRLDC

mentioned that time bound action plan with break-up details of mile stones was not

furnished by the constituents for effective monitoring by the forum. Repeated

confirmation that action was being taken may not bring any appreciable progress in

this regard. Thus, there was huge back log in this regard which was to be attended

by the constituents.

8.2 High Voltage

8.2.1 SRLDC presented the following table, highlighting the severity of the problem:

Station Max Voltage

in kV

Average duration in minutes per day when V > 420 kV

Vijaywada 435 1290

Nagarjuna Sagar 426 91

Hyderabad 435 525

Kurnool 430 371

Khammam 431 169

Vemagiri 429 245

Srisailam 434 863

Hiriyur 430 46

Guttur 429 166

Narendra 430 136

8.2.2 SRLDC mentioned that the GT tap changing at many locations as recommended by

SRLDC studies were yet to be done. Considering the upcoming monsoon, it had to

be done urgently. For reviewing implementation status, SRLDC requested all the

constituents to furnish the present tap position details and the changes made during

the past one / two months within 15 days.

8.2.3 SRLDC also requested co-operation of VTPS and Srisailam to absorb MVAR as per


45

capability curve limit. Also, during MVAR capability testing at Srisailam LB, the

station mentioned that they would take-up with manufacturer regarding limiting level

of MVAR absorption in synchronous condenser mode operation. However, feedback

was yet to be received and the same needed to be expedited.

8.2.4 MVAR absorption details by generating stations near high voltage zones in some

specific instances (Annexure-8A) were also presented. GT tap position at VTPS &

less MVAR absorption at Srisailam were the reasons for high voltage in Vijayawada.

8.2.5 MS I/c, SRPC informed that a Special Meeting on RGMO/MVAR interchange had

been planned on 23.06.2014 and requested all SLDCs to analyze the MVAR

interchange of its control area generators and present the same. Tap changing had

to be done as per the recommendations finalised in the earlier Meetings. The

recommendations finalized in the Special TCC meeting held on 21st August 2013

and also in the Meetings held on 29th June 2013, 25th July 2013, 30th Sep 2013 &

29th Jan 2014 were required to be implemented. Status in this regard was required

to be communicated to SRPC/SRLDC. Information regarding MVAR interchange

had to be furnished to [email protected].

8.2.6 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.

8.2.7 Following remedial measures had been reiterated:

Maximize the MVAR absorption by generators near high voltage zones Concerted action/follow up by SLDC was required at High Voltage nodes. Operation of machines in synchronous condenser mode wherever feasible Installation of Bus reactors as recommended by Standing Committee on

Power System. Optimizing Tap Position of all GT’s / ICTs to ensure that the Grid Voltages

remain close to 400 kV. Tap position of new generating units (before COD) were also required to be optimized.

Optimising GT Tap position to ensure that the Grid Voltages remain close to 220/230 kV or as applicable (where the generating stations were feeding to the grid).

Capacitors Banks to be taken out. Line opening would be the last resort by SRLDC after receipt of message

from the constituents.

8.3 Status of Bus/Line Reactors commissioning at Guttur & shifting of Hoody reactor


46

8.3.1 In the 22nd TCC Meeting held on 25th October 2013, KPTCL had informed that

decision had been taken to shift the line reactor from Hoody to Guttur and works

were scheduled to be completed within 5 months.

8.3.2 In 91st OCC Meeting, it had been noted that the bus reactor for Guttur had been

received at site and commissioning activities had been initiated.

8.3.3 KPTCL had been requested to expedite the shifting Hoody reactor. It was noted that

the delay in shifting was being reported to CERC under prolonged outages.

8.4 Status of commissioning of Balance Bus/ Line Reactors/STATCOM as agreed in the Standing Committee meeting

8.4.1 The updated information on schedule of commissioning of Reactors as agreed in

the Standing Committee on Power System Planning of Southern Region is furnished

at Annexure –8B.

8.4.2 In earlier Meetings, APTRANSCO had informed that GMR was not responding

positively on the proposal. KPCL informed that Reactor at Raichur would be

commissioned by June 2014.

9. SYSTEM SECURITY MEASURES

9.1 U/F &df/dt Relays Schemes

9.1.1 Updated AUFR / df/dt quantum implemented/expected by states at various stages is

furnished as Annexure-9A.

9.1.2 Details of Load Relief obtained through various defense schemes are enclosed as

Annexure-9B.

9.1.3 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. It was noted that only KSEB and PED were submitting the

daily report regarding 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. 265/MP/2012) Hon'ble CERC had issued final Order

dated 20th February 2014. Para 57 is reproduced below.

“57. …… the view that the performance of Grid in regard to parameters

envisaged to be controlled under GSES scheme should be monitored for six


47

months before considering the scheme for implementation of GSES. The

petitioner is directed to file performance of Grid after 6 months from the date of

issue of the order indicating necessity of GSES, even after implementation of

ADMS, SPS, AUFRS. If the situation warrants need for implementation of

GSES, the petitioner is at liberty to approach the Commission along with

technical details of defense mechanism equipment, comprehensive scheme of

OPGW, etc in accordance with law.”

9.2.3 It was noted that CERC had issued show cause notice under section 142 to many

constituents (all the SLDCs of SR) in its ROP in Suo motu Petition No.

007/SM/2014 which was listed for hearing on. 22.05.2014. It was also noted that

because of the affidavits and requests by various constituents in the country, CERC

had deferred the implementation of GSES.

9.2.4 KSEB vide their letter dated 20.05.2014 has informed that ADMS has been

implemented (Annexure -9C).

9.2.5 AGM, SRLDC stated that in Southern Region, though all the constituents informed

CERC through affidavit that Automatic Demand Management system was in place,

but in none of the SLDC the scheme was made automatic. Only proto type

successful trial operation had been confirmed by KSEB. As on date the facility of

remote tripping through manual tripping was only followed by the constituents.

Therefore, it was imperative to implement the scheme as directed by the Hon’ble

Commission on urgent basis. He clarified that because of the affidavits and requests

by various constituents in the country, CERC had deferred the implementation of

GSES. This had led to a situation of neither ADMS nor GSES being in place.

9.2.6 In response to a query by TN and AP that a uniform logic for all the constituents to

be finalized in the OCC forum, it was clarified that the logic to be implemented was

clear with the details of Deviation Settlement Mechanism Regulation, IEGC

amendment 2014 and the OCC consented message issuing procedure of SRLDC.

The constituents had to develop appropriate logical steps in this regard.

9.2.7 MS I/c, SRPC said that IEGC Regulations had been notified in 2010 and ADMS was

to be implemented by 01.01.2011. It was also pointed out that ADMS was not

restricted to Automatic Load Shedding Scheme but had wider scope like demand

response (TOD metering etc) which could be different for each utility/DISCOM. He


48

said that the control area variations should not affect the regional grid . The system

parameters/volume limits as specified in IEGC/Deviation Settlement Mechanism

should not get violated.

9.2.8 KSEB informed that proto type ADMS has been made operational. Kerala was

requested to demonstrate the functioning of ADMS to SRPC/ SRLDC. The suitable

date may be intimated by KSEB. Other constituents may discuss with KSEB

regarding the implementation process/logic to ensure compliance of Regulations.

9.2.9 All the SLDCs except KSEB had been requested to finalize the scheme and get it

approved through their management for implementation by month end.

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))

9.4.1 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

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.

9.4.2 The issue was noted for compliance by the concerned utilities.

9.5 Tripping Details/Reports

9.5.1 In the 23rd TCC meeting held on 14th March 2014, SRLDC had raised concern that


49

SRLDC was not getting tripping information/data within 24 hrs as per IEGC and

sometimes the information from both the ends was not being received. Also at times

line details only were being received without DR&EL details. SRLDC was unable to

analyze events on account of non-receipt of details of tripping in a timely manner.

The status of information being received is enclosed as Annexure- 9D. SRLDC also

said that all tripping details should be uploaded on the SRLDC web portal.

9.5.2 SRLDC stated that all tripping related information and analysis needed to be

furnished with DR & EL report within 24 hours in line with IEGC/CEA regulations.

9.5.3 As per the CERC RoP on Petition No. 146/MP/2013 with IA 36/2013(for date of

hearing 19.12.2013) the following was noted:

“7 The Commission also noted that the petitioner raised the issue of Non-

compliance of the Regulation 5.2(r) of the Grid Code which mandated all users to

report the disturbance/fault to RLDCs within 24 hours of occurrence. The

Commission directed the Petitioner to submit the instances of non-compliance by

SLDC/Users by 10.01.2014.”

Subsequently CERC had issued the Final Order dated 20.02.2014 for Petition No.

146/MP/2013. Para 29 from the order is reproduced below:

“29. …... We administer a strong warning to the respondents to take all possible

measures permissible under the Act and the Grid Code to provide data /information

to RLDC and RPC for maintaining reliability and security of the grid. We also make it

clear that failure in this regard will amount to non-compliance of the directions of this

Commission and render the constituent liable for proceedings under Section 142 of

the Electricity Act, 2003 and other relevant provisions. We also direct the petitioner

and SRPC to coordinate and monitor the progress and compliance of Commission's

directions and ensure compliance of Regulations 5.2 (r) of the Grid Code and report

instances of non-compliance to the Commission...”

9.5.4 MS I/c, SRPC reiterated that non furnishing of timely tripping details would be

treated as non compliance. Procedure for timely furnishing information was needed

to be streamlined by the utilities.

9.6 Declaration of availability and healthiness of various protection / defense

mechanism

9.6.1 AGM SRLDC pointed out that the healthiness certification received from


50

constituents gives an impression that the focus on proper site level checking before

issuance of certificate was missing. Number of instances of multiple trippings due to

protection system lapses endorsed the observation of SRLDC. Therefore, to avoid

any big mishaps, it was requested all the constituents to ensure thorough checking

of all the equipments and their protection system before issuing healthiness

certification.

9.6.2 KPCL and NLC observed that the table was not to be filled up during healthy

conditions.

9.6.3 MS I/c, SRPC noted that healthiness certificates and other reports were being

requested as per directives of higher bodies.

9.7 Special Protection Schemes

9.7.2 Status of SPS under implementation

9.7.2.1 Status of ongoing SPS scheme is enclosed as Annexure-9E. Respective utilities

were requested to expedite the same.

9.8 Status of Contingency Plan by TN to overcome variability of wind generation

9.8.1 In the Meeting held on 7th June 2013 at SRPC, Bangalore TANTRANSCO had

agreed to take up the LVRT settings and Reactive Power Compensation issues with

wind generators. Study of SPS requirement in the contingency of tripping of any

one of the 230 kV lines terminating at Tirunelveli etc. was also to be undertaken. In

the meeting held at Kudankulam on 22nd July 2013 the urgent need for having the

scheme was emphasized on the view that wind generation was currently at a high

level coupled with injection from KKNPP during August 2013.

9.8.2 In 88th meeting of OCC, SRLDC had observed that the earlier/above

recommendations were required to be implemented by TN .The wind generation

was varying from 300 MW to 3000 MW and hence it was imperative that the

automated defense plan be implemented. Substantial quantum of wind generation

had also been added in Karnataka Grid and they should also implement automated

defense plan to counter the wind generation variability. TANTRANSCO had stated

that matching load curtailment/generation addition was being carried out by TN

SLDC during fall in wind generation. During rise in generation if evacuation

constraints were being observed wind generation was being backed down. The wind

generation was dominant only for 4 months in a year and hence automated scheme

may not be necessary for such short period. MS I/c, SRPC had observed that 4


51

months was relatively long period and Wind generation in TN was going beyond

3,000 MW on certain occasions. There were instances of loss of wind generation

due to suspected low voltages (no LVRT features) and it becomes necessary to

implement automated defense plan and also implement the earlier

recommendations.

9.8.3 As per the final CERC order dated 22.02.2014 in respect of the Petition No.

120/2011, CERC had directed TANTRANSCO to take necessary steps to implement

automatic demand side management scheme to deal with the emergency situations

such as sudden variation of wind generation or forced outages etc. and submit the

monthly progress report to SRLDC and SRPC in this regard.

9.8.4 In 94th OCC meeting, TANTRANSCO had informed that they had identified the

feeders of quantum of 650 MW and the P&C wing of TANTRANSCO was

implementing the scheme. MS I/c, SRPC requested TANTRANSCO to submit the

details of ADMS along with the implementation schedule to SRLDC/SRPC by

15.04.2014. Subsequently, SRPC vide letter dated 10.04.2014 to TANTRANSCO

had requested for the details and for monthly status report in this regard.

9.8.5 TANTRANSCO vide letter dated 26.04.2014 had stated that a uniform methodology

and systematic logic may be evaluated for implementing ADMS scheme since the

scheme is of common one for all the constituents in Southern Region and requested

to take up in the OCC meeting for detailed deliberation. Subsequently vide letter

dated 30.04.2014, SRPC had clarified to TANTRANSCO that as per IEGC clause

5.4.2(d) each SLDC had to implement ADMS through respective SEBs/DISCOMs

which could include load shedding, demand response etc. which may be unique to

respective state. Also ADMS should be able to deal with the emergency situations

such as sudden wind variation or forced outages etc. and ensure that the system

parameters/volume limits as specified in IEGC/Deviation Settlement Mechanism

were not violated. It was also requested that the details of the ADMS along with

implementation schedule be furnished to SRLDC/SRPC by 9th May 2014. Monthly

status report was to be furnished to CERC as part of regulatory compliance.

9.8.6 In 95th OCCM, TANTRANSCO had stated loads had been identified for ADMS and

was being implemented by P&C wing of TANTRANSCO, but the logic part was to be

finalized for implementation.


52

10. SCADA & COMMUNICATION ISSUES

10.1 In the Meeting, SRLDC presented the status of data, voice and internet

communication and pending field inputs. Details are enclosed as Annexure-10A. It

was stated that the Standby data channel and Voice Communication from NTECL

Vallur to SRLDC was frequently going out of order. Standby data channel from 400

kV SS (SR-1 and SR-2) was to be made through. Talcher Stage II data was still to

be configured. Non availability of data in real time from NLC Stage II was yet to be

rectified. Reliable and dedicated internet communication was to be ensured by all

the users.

10.3 CM, SR I PGCIL informed that regarding the provision of standby data channels

from 400 kV SS, works were underway.

10.4 AGM, NTECL Vallur informed that they had procured four converter cards and

handed over to PGCIL for installation. PGCIL/NTECL were requested to complete

the pending works at the earliest.

10.5 AGM, SRII, PGCIL informed that DCPC for Talcher Stage II data had been installed

and extended to SRLDC end. Only integration works at SRLDC end were pending.

10.6 DE, APTRANSCO informed that they were facing difficulty in computing the state

drawals/demand as data was not available from unmanned stations like Khammam,

Vijayawada etc.. It was clarified that operational data (SCADA) was being used by

other states for computation of drawl/demand and similar procedure could be

adopted by AP and Telangana SLDCs.

10.7 It was noted that CERC vide Order dated 25.04.2012 on Suomoto Petition no.

SM/007/14 had issued show cause notice under section 142 to many constituents

(KPTCL in SR) for non compliance of Commissions direction dated 26.09.2012 in

Petition No. 168/MP/2012 and was listed for hearing on 22.05.2014.

10.8 SE (O), SRPC stated that regarding the validation of SCADA data between

generating stations & SLDC and SRLDC & ISGS as decided in the Special Meeting

on RGMO & MVAR held on 29th January 2014, compliance report of validation to be

furnished and to be done regularly.

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


53

furnished every quarter. The information regarding Cyber Security was to be

furnished to Chief Engineer, DPD, CEA, Sewa Bhavan, and New Delhi-110066.

Report on Physical Security, other Mock Drills for CMP, Mock Drill for Black Start

Restoration was to be furnished Chief Engineer, DMLF, CEA, Sewa Bhavan, New

Delhi-110066. A copy of the reports was to be sent to SRPC Secretariat

([email protected] and [email protected]).The practices being followed

in respect of Cyber Security/Physical Security/CMP/Mock Drills w.r.t. Black Start

was also required to be communicated once a year.

11.1.2 CEA, vide letter dated 26.11.2013 had enclosed MoP letter dated 21.11.2013

regarding Security of power installations and status. It is therefore requested that

the following information in this regard may please be furnished to Member (GO &

D), CEA, New Delhi for onward communication to MoP with a copy to this office:

Standard Security guidelines for power installations and the status of implementation including Cyber Security.

Systematic up gradation and modernization of security systems and procedures.

Coordination and liaison with local police and intelligence units.

11.1.3 SE (O), SRPC said that few constituents were only furnishing the requisite

information. Utilities/constituents may please contact respective Nodal agencies for

any queries and clarifications with respect to Cyber Security. Other details like

Physical security, Mock drill for CMP, Mock drill for Black start Restoration is to be

sent in the required format. The above information required by MoP was to be

communicated by all at the earliest.

11.2 Black Start Procedure

11.2.1 Updated information on Mock exercise is enclosed at Annexure-11A. Constituents

were requested to furnish the schedule for July - December 2014.

11.2.2 SRLDC expressed concern over that all the states/constituents were not following

point to point exercise as given in the standard format communicated for Disaster

Management. Few utilities like Kerala were only following as per the circulated

format.

11.2.3 It was requested that other constituents to complete point to point exercise as per

circulated format. Operational feedback would be helpful in updating BSR

mailto:[email protected]



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Procedure.

12. RGMO

12.1 RGMO response had been deliberated in the Meetings held on 29.06.2013,

25.07.2013, 21.08.2013(Special TCC) and 30.09.2013. The issue was further

highlighted in the 23rd SRPC and 22nd TCC Meetings held on 25th October 2013 and

26th October 2013 respectively. Inadequate response was an area of serious

concern and there was no noticeable improvement. Therefore the non compliance

had been reported to the Hon’ble Commission under section 1.5 of IEGC. SRLDC

had also filed petition in this regard on 06.11.2013 before CERC. The issue was

further deliberated in the MoP Meeting held on 13.01.2014 & 07.02.2014. The

RGMO response was again analyzed in the meeting of RGMO/MVAR held on

29.01.2014 and Action Plan was finalized.

12.2 In the 94th OCC meeting, SRLDC had stated that new generating stations were to

demonstrate RGMO before COD as per new Terms and Conditions of Tariff

Regulations. It needed to be deliberated how the RGMO testing could be validated.

12.3 AGM, SRLDC said that response analysis details for the incident dated 12th March

2014 was to be submitted through affidavit to CERC by SLDCs as directed by

Hon’ble Commission in the RoP of petition 302 / MP / 2013. However, the details

were yet to be received from some of the constituents including ISG Stations. All the

constituents were requested to submit the same immediately with a soft copy along

with Excel sheet to SRLDC/SRPC for consolidation and appraising CERC

accordingly. The petition was originally listed for hearing on 20.05.2014 and was

shifted to hearing in June’14. He requested all the constituents to ensure strict

compliance of IEGC in the matter of RGMO / FGMO with MI performance as well as

proper Demand Management without sudden change of huge quantum in hourly

boundaries.

12.4 MS I/c SRPC requested SLDCs to analyse the RGMO instances posted by SRLDC

and to make presentation in the Meeting to be held on 23.06.2014. The generators

were to take all steps to ensure intended RGMO/FGMO response. He requested the

constituents to update the status of RGMO/FGMO with Manual Intervention as given

in Annexure- 12A. Generators were once again requested to furnish the information

through Web Group ([email protected]).



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13. LGBR & OUTAGE PLANNING

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

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

13.1.2 In this regard the following was noted from the Order dated 19.12.2013 on Petition

No. 249/250/251/MP/2012

“We direct all STUs/SLDCs of the Northern Region, Southern Region and Eastern

Region to forecast their demand and make adequate arrangements to avoid

dependence on Unscheduled Interchange for meeting their demand or for injecting

short term surplus power, irrespective of the frequency”

13.2 Outage Deviation for the year 2013-14 in respect of Generating Units/Transmission Elements of Southern Region

SE (O), SRPC informed that the outage deviation report for the year 2013-14 would

be communicated to Hon’ble CERC after incorporating the comments received till

date.

13.3 Outage Planning and Annual Generation target for the year 2014-15

13.3.1 As per provisions contained in the IEGC the Annual Outage Plan for the generating

units, transmission lines and ICTs has to be prepared by SRPC.

13.3.2 LGBR based on approved MoP Annual Generation Targets for the year 2014-15

had been posted on SRPC website

14. TRANSMISSION NETWORK ISSUES AND SYSTEM OPERATION ISSUES

14.1 Details of Prolonged Outages reported to Hon’ble CERC as furnished in

Annexure-14A.

14.2 PGCIL was to revert back regarding the 17th September 2013 incident at

Bhadrawati HVDC B2B when power was not increased as directed by SRLDC

citing voltage issues on AC side. AGM, SRLDC stated that for a vital element

like HVDC Bhadrawathi availability of alternate / reliable auxiliary supply was

very critical and the requirement was in line with CEA Technical Standard.

Uninterrupted changeover during failure of existing auxiliary supply could not

happen due to the inherent start-up time lag of DG set. The matter was raised

in many OCC meetings. Therefore, intervention of SRPC was requested to

escalate the issue appropriately.


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14.3 KSEB vide letter dated 10.06.2014(Annexure- 14B ) reported on blackout

occurred at Northern part of Kerala on 28.05.2014.

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.

SRLDC requested the forum for appropriate decision regarding considering the

level of generation for the generating units that do not have adequate evacuation

network and continuous infirm power injection by generators. This decision is

important as the TTC / ATC computation is based on the details furnished in the

LGBR during OCC. If the constituents furnish the LGBR details in the specified

format in specified format or submission of network data in PSSE format (.raw file)

on day ahead basis, ATC computation could be done by SRLDC with better

accuracy on day ahead basis.

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

between maximum and minimum demand for the month of May 2014 are furnished

below:

State

Maximum to Minimum Demand Variation %

Highest Lowest Average

Andhra Pradesh

30.98 27th (Tuesday)

7.53 16th (Friday)

17.10

Karnataka 45.38

9th (Friday) 17.32 25th (Sunday)

25.82

Kerala 47.55

9th (Friday) 19.60

28th (Wednesday) 32.35

Tamil Nadu 22.74

10th (Saturaday) 10.14 11th (Sunday)

15.95

Puducherry 37.86

7th (Wednesday) 16.29

25th (Sunday) 27.10

Southern Region

27.26 9th (Friday)

9.89 18th (Sunday)

14.94

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


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15.3 Forced outages of thermal units

15.3.1 OCC was also apprised of the forced thermal outages of more than 24 hours

duration during the month. Day wise percentage of forced outages in respect of

Central Sector stations had varied from 3.82 % to 20.17 % and in respect of State

Sector it had ranged between 2.64 % and 29.73 %. Planned outages in respect of

Central Sector stations was nil and in respect of State Sector were 1.18% to 5.06%

(Annexure-15A).

15.3.2 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 73.86 MU

respectively in pump mode during the month.

15.5 Data/ Information requirements of SRLDC

15.5.1 SRLDC requested timely reporting of the following:

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

Providing split-up of details of Non Conventional Energy Sources generation for Solar, Biomass, Wind, Biogases & 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.

15.5.2 SRLDC raised certain commercial issues and requested early action by the

concerned (Details furnished in Annexure-15B). SRLDC requested the

constituents to furnish the data for Grid Elements, Annual Report etc in a timely

manner.

15.6 Wind Generation

15.6.1 SRLDC presented the day-wise Wind Generation pattern in Karnataka & Tamil

Nadu during the period 1st May 2014 to 31st May 2014. Wind generation in Tamil

Nadu had varied between 0.576 MU (04.05.2014) to 62.234 MU (31.05.2014).

Wind generation in Karnataka had varied between 1.855 MU (04.05.2014) to

16.774 MU (25.05.2014). Details are furnished in Annexure-15C.

15.6.2 In the 94th OCC meeting, SRLDC pointed out that usually the wind generation in

Tamil Nadu and Kerala follow the same pattern. It was observed that there was


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significant difference in wind generation in Tamil Nadu when compared to

Karnataka generation as per past experience. It was decided that Tamil Nadu

would come up with the reasons on the above observations in the next OCC

Meeting. Details from TN were awaited.

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 Coal Stock Position

15.8.1 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 3rd June 2014 as downloaded from CEA website is furnished at

Annexure-15D. It was noted that the coal stock position in the following thermal

stations was less than that for 7 days generation:

VTS 0 day KTS 5 days Rayalaseema TPS 1 day Simhadri TPS 1 days Kakatiya TPS 4 days Talcher 1 days NCTPS 4 day Vallur TPS 5 days

15.8.2 Generators were requested to improve the coal stock position, especially weak

monsoon was anticipated.

15.8.3 Coal Stock status received from Generators/Constituents is enclosed as Annexure-

15E.

15.9 Normative vs. average actual ex-bus generation

SRLDC presented the details of normative and average actual ex bus generation

in respect of ISGS for the month of May 2014 (Annexure-15F).

15.10 Utilisation of inter-regional links

SRLDC presented the utilization of inter-regional links (Annexure-15G).

15.11 Drawal of auxiliary power by MEPL

The issue of drawal of auxiliary power for start up activities from ISTS was

deliberated in view of no other connectivity with state grid. SRLDC observed that

in real time drawal should take place after SRLDC approval only. After


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deliberations in view of lack of clarity in regulations, OCC recommended for drawl

of power for auxiliary power consumption and start up without any access

provided grid parameters are within permissible limits.

15.12 Drawal Extremes

DGM, SRLDC presented the statement of Drawal Extremes during the month of

May 2014. The maximum till date are furnished in the table below:

State

Extremes May 2014 Extremes till date(up to March

2014)

Max (MW)

Date Time Block

Min (MW)

Date Time Bloc

k

Max (MW)

Month Min

(MW) Month

AP 4646 02-May-

14 17 2321 10-May-14 39 5616 Oct-13

-1280

Aug-06

KAR 1872 07-May-

14 71 -89 09-May-14 28 2722 Sep-10 -947 Sep-09

KER 2043 08-May-

14 81 998 3-May-14 29 2133 May-13 -610 Oct-07

TN 4208 2-May-14 40 2566 8-May-14 14 4447 April-14 -100 Oct-03

PUDU 344 22-May-

14 76 122 15-May-14 6 344 April-14 8 Dec-11

Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and Puducherry had variations of

2325 MW, 1961 MW, 1045 MW, 1648 MW and 222 MW respectively.

15.13 Other information

Planned and Forced outages of Generating Stations are enclosed as Annexure-15H.

Variable Cost of ISGS/CGS Stations is enclosed as Annexure-15 I.

Details of Bilateral exchanges (as per PSP) and Power Exchange (as furnished by States) are enclosed at Annexure-15 J.

PLF of Major IPPs is enclosed as Annexure-15 K.

Details of Maintenance of Transmission Elements are enclosed as Annexure-15 L.

16. VOTE OF THANKS

MS I/c, SRPC thanked the participants for their active participation in the Meeting.

17. DATE & VENUE OF THE NEXT MEETING

The schedule for next OCC Meeting is as follows:

Meeting : 97th OCC of SRPC

Date : 11.07.2014 (Wednesday)


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Time : 10:00 Hours

Venue : SRPC, Bangalore ************

SOUTHERN REGIONAL POWER COMMITTEE - Karnataka · 2014-07-02 · Southern Regional Power Committee...

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