SOUTHERN REGIONAL POWER COMMITTEE, BANGALORE · Valur (42.3%) had achieved less than the normative availability. He stated that NLC TS-I Expn despite being a lignite based plant could

SOUTHERN REGIONAL POWER COMMITTEE, BANGALORE

Minutes of the 81st Meeting of the

Operation Coordination Sub-Committee(OCC) of SRPC

held at Bangalore on 11th and 12th March 2013

1.2 Welcome address on 12th March, 2013

• Shri S.R. Bhat, Member Secretary i/c, SRPC welcomed the Members &

other participants to the 81st OCC Meeting.

1 Introduction

The 81st meeting of the Operation Coordination Sub-Committee was held in SRPC, Bangalore, on 11th and 12th March, 2013. The list of Participants is given at Annexure – 1A.

1.1 Deliberations of Meeting on 11th March, 2013

a) Shri S.R. Bhat, Member Secretary i/c, SRPC welcomed the Members &

other participants to the 81st OCC Meeting. The meeting commenced at

2.30 PM in the afternoon.

b) MS i/c explained the background for conducting pre - OCC meeting. He

said that in other RPC forum, two-day OCC meeting format was already in

place. Fruitful discussion on many major issues pertaining to SR grid could

thus take place in the next day meeting. He said that the change was

necessitated on account of the increased number of elements that had

come up for outage approval. He also emphasized the need for thorough

scrutiny of system conditions which may prevail during those outages,

before approval of the same. MS i/c informed that NLDC had prepared a

document on Draft Procedure for Transmission Elements Outage Planning.

It had been desired that the procedure be discussed in the OCC meeting

and comments be sent to NLDC for finalization of the procedures.

c) The outage proposals for the month of March and April 2013 of around 120

transmission elements covering Central and State transmission elements

were thereafter discussed and the outage dates were approved.

Minutes of the 81st Meeting of OCC held at Bangalore on 11th and 12th March 2013 2

• MS i/c welcomed Shri S. Prabhakar, GM (OS), NTPC, Hyderabad and also

SE-I and SE-II of RTPS, KPCL who were attending the meeting. He

informed that KPCL would be making a presentation on the technical

issues of machine behavior during RGMO operation.

• MS i/c had a word of appreciation for Ramagundam Stage III and NLC TS-I

Expn for having achieved 103.6% and 102.2 % availability respectively

during February 2012. However, Talcher (83.5 %), Simhadri (75.9%) and

Valur (42.3%) had achieved less than the normative availability. He stated

that NLC TS-I Expn despite being a lignite based plant could achieve

89.9% availability. He also had appreciation for Tuticorin and Mettur

thermal power plants for achieving more than 99% PLF.

• He informed that TN had addressed a letter to NTPC expressing concern

that Simhadri unit-3 was under outage due to coal shortage at this crucial

time. He hoped that GM (OS), NTPC would during the course of meeting

proceedings brief the forum about the current status in this regard.

Concerns were expressed by MS i/c on loss of generation at Talcher due

to coal shortage.

• He also drew the attention of the Members on the recent ROP issued by

Hon’ble CERC in respect of Petition No. 263/MP/2012. He said that

SRLDC had to submit a quarterly report regarding progress of

increase in quantum of relief to Hon’ble CERC. He requested the

cooperation of the utilities in this regard.

• On RRF front, he said that the mock exercise of scheduling was supposed

to have commenced in February-2013. But barring Karnataka, no other

state had furnished the data. In this connection, he mentioned that SRLDC

had addressed a letter to Karnataka seeking details about pooling stations

commissioned after 3rd May 2010. He stressed on the essentiality of mock

exercise and preparedness before the actual RRF mechanism that would

take effect from 01st July.2013.

• MS i/c intimated that RGMO had become operational at NTECL Vallur

since 11.03.2013 as per the intimation received from the plant.


• It was also mentioned that SRLDC had taken up the matter regarding

sudden changes in drawals by beneficiary regional entities under clause

1.5 of the IEGC Regulations (sudden change in drawl/injection by more

than 100 MW).

• On the possible delay of over a year for getting a reactor from M/s BHEL,

due to the fire mishap at testing lab, MS i/c suggested that a spare reactor

from Hoody substation could be transferred to Guttur to meet the

immediate requirements. On the issue of reactive power absorption of the

units in the Vemagiri complex, he said the absorption details for December,

2013 would be presented in the course of the Meeting.

• MS i/c explained about the document on Draft Procedure for Transmission

Elements Outage Planning issued by NLDC and requested the Members

to furnish their feedback/comments in the Meeting or positively within a

weeks’ time after consulting their respective management.

• ED, SRLDC expressed thanks and appreciation for the constituents and

other RLDCs for the cooperation extended during outage of 400 KV

Vijayawada – Nellore line during the Sivarathri festival.

1.3 Presentation by KPCL on RGMO Response

KPCL made a presentation in respect of RTPS on 13.01.2013 at 18.00 HRS to

18.15 hrs

The presentation highlighted technical points and other related information:

a) It was noted that at the time of analysis, Unit-1 was not in service,

Unit-2 RGMO was in off condition, while other units were with

RGMO functioning.

b) Unit-2 problem was likely to be addressed during the next

scheduled overhaul of the unit during June-2013.

c) The coal mills are overloaded many times and not in a position to

take further load. Loading of the mills was linked to the type of coal

and its quality to maintain the required level of generation. Based

on the quality of coal etc., under certain conditions it was not

possible either to accept or reject load.


d) Turbine blades would be in healthy condition, if the operating

frequency was within +1 or – 1% variation of the design frequency.

Out of this range, its life would be endangered.

e) During the overhaul in 2013-14, R & M of Unit Nos 1 & 2 would be

taken up. In respect of Unit Nos 5 & 6, the same was under

negotiation.

f) SRLDC stated that while frequency was going above 50.2 Hz, it

needed to be controlled. It therefore suggested that auto operation

of oil-firing for the unit may be considered. KPCL replied that oil

firing of the plant could not be made automatic and required manual

intervention. NLC opined that during mixed firing of the boiler, there

was a possibility of fire etc and hence the same was not

recommended. NTPC said that automatic oil firing was dangerous

due to fire hazard and manual intervention was required. SRLDC

said that constraints needed to be taken up in the appropriate

forum for redressal. However till any exemption was obtained by

the generators, monitoring of performance would be with respect to

the existing regulations. SRLDC also suggested that the units be

run at lesser load to meet the variations. SRLDC also said in case

the generators and other utilities were unable to moderate their

injection/loads, then frequency excursions would be inevitable.

g) KPCL stated that the system consisted of old as well as new DCS

systems. There were problems in retrieval data from the system as

some DCS were with data retention for only 48 hours while others

were for 6 months.

h) Details are given at Annexure-1B.

1.4 NTPC presentation:

NTPC stated that they were regularly submitting the necessary data to Hon’ble

CERC on RGMO operation. SRLDC pointed out that being the system

operator, they would like to know the dynamics of machines and limitations

and hence would like this data to be made available to them also.


i. NTPC presented machine response graphs for certain dates. It was

informed that the machines were able to respond to variations in the

frequency. NTPC also pointed out that around 20 out of 96 time blocks in a

day the frequency was above 50.1

ii. During the course of presentation, NTPC described that for reducing the

generation two actions involved: one was to close the steam control valve

while the other was to reduce the coal loading. It was informed that it would

take around 5 minutes time for the pressure to settle. NTPC quoted an

EPRI study report in the year 2000 and further detailing that European

turbines were mostly designed for load cycle change function, whereas

Indian units were designed for base load function. It was further informed

that thermal response would not be as quick as hydro response and the

inherent time constant/delay due to various looped and interconnected

components of the thermal system was preventing immediate response of

the units.

iii. The following action was envisaged for monitoring RGMO Performance

1. The OCCM participants email ID's would be added to [email protected] web group.

2. Any Event requiring analysis of RGMO Performance would be intimated by SRLDC through web group within 2 days.

3. The constituents would submit the data / RGMO Performance for the events mentioned above in the web group.

4. SRLDC would prepare the analysis & post the same in web group & the same would be discussed in every OCCM.

5. The generators who are not submitting the data in respect of the observations made by SRLDC would be treated as accepting the remarks of SRLDC.

iv. Details are at Annexure-1C.

1.5 SRPC Presentation:

i. SRPC presented results of analysis of Vemagiri complex Generators data

for the month of December, 2012. It was noted that GMR and Konaseema

had marginally improved in their absorption values whereas GVK and

Gautami had marginally decreased in their absorption values, though the

average generation remained same during November and Decemeber-


2012. It was also noted that tap position of Generator Transformer was not

changed as desired.

ii. SRLDC suggested that as noted in the previous Meeting, the idling 80

MVAR reactor of GMR phase-II could be used at Vemagiri complex to

contain the high voltage issue. Further, it was noted that LANCO also had

one reactor in that area and the possibility of using it had to be explored.

APTRANSCO was requested to please look into this matter.

iii. Details are at Annexure-1D.

1.6 Member Secretary i/c requested Shri A. Balan, Superintending Engineer to

take up the Agenda for discussions and accordingly the same was taken up.

2 Confirmation of the Minutes of 80th OCC Meeting

The Minutes of the 80thOCC Meeting of SRPC held on 13th February, 2013 were confirmed

with the following correction:

i. On item no. 3.4 (b) relating to deemed availability for transmission lines due to

unexpected pollution, TANTRANSCO said that it would have to consult its

management on the issue.

3 Major Issues

3.1 Line Loading of Salem-Soolagiri Line

a) Issue:

TANTRANSCO had implemented SPS for contingency of 400 kV Salem-

Soolagiri line w.e.f. 29.10.2012, providing load relief of 300 MW to enhance

the ATC in the S1-S2 area. It had been assured that ATC of Tamil Nadu would

be increased by 100 MW. However ATC had not been increased. As per

SRLDC view, expressed in TCC meeting held on 01.02.2013, it is due to the

line loading constraints of 400 kV Salem-Soolagiri line. TNEB's request to

Powergrid to specify the maximum line loading capacity of 400 kV Salem-

Soolagiri line.

(TNEB letter and Power grid letter at Annexure-3A)


b) Deliberations:

i. TANTRANSCO said that the loading limits needed to be reviewed..

SRLDC said that from the letter submitted by PGCIL, the asset owner

of the subject transmission line, the ATC value would be derived. The

permissible line loading would need to consider thermal limit, voltage

limit as well as stability limit.

ii. SRLDC also stated that the sensitivity of the 400 KV Bangalore –

Salem line and Hosur (Soolagiri) – Salem line are interdependent such

that if one line trips the loading on the other had to be brought down to

40%. TATRANSCO recalled that it was earlier promised by SRLDC

that ATC would be enhanced once the SPS was in place but the same

could not be realized after implementing SPS. MS i/c said that the line

loading had to be based on the data provided by the asset owner while

SPS for another purpose.. SRLDC clarified that in case the SPS was

not in place, the existing ATC may have to be reduced to get margin for

the system operation. It was also informed that once Mettur Stage-3 or

Neyveli TS-II Expansion units become fully operational, the constraints

would get eased.. MS i/c stated that any decision on ATC margin

needed to be left to the prudence of SRLDC. TANTRASNCO informed

that the top management wanted to know the benefit attained after

spending nearly Rs 30 lakhs on SPS for Salem – Soolagiri (Hosur) line.

SRLDC stated that of the 18 numbers of SPS envisaged in SR, 12 SPS

had been commissioned. KSEB opined that that n-1 security criteria

and SPS security criteria could be combined and then ATC could be

decided accordingly. MS i/c said in the new scenario after the

disturbances in NEW Grid, there was very little cope for operator

errors. It would be prudent to maintain necessary margins in the

interest of system security and safety.


3.2 RTPS Unit 8 Outage

a) Issue:

KPCL informed about the hand tripping of Unit 8 of RTPS (250 MW) on

16.02.2013 because of Bottom Ash Hopper problem. Shut down was

continuing and since ESP Pass A also damaged, shut down may continue

further.

(KPCL letter at Annexure-3B)

b) Deliberations:

It was told that by the weekend, 50% of load would come and they would try

150-160 MW generation without coal through oil firing.

3.3 Synchronization of Unit-5 of Nagjheri Dam Power House (NDPH)

a) Issue:

NDPH unit-5 was taken out for maintenance work on 20.12.2012. Though

approved shutdown period was for only 7 days, the synchronization was still

pending causing inordinate delay.

(KPTCL letter at Annexure-3C)

b) Deliberations:

It was informed that on account of 1.5 mm difference in shaft sealing,

the problem was continuing and M/s BHEL had started modification at

site itself and the work would be completed in two months' time.

3.4 Installation of Bus reactor at Guttur

a) Issue:

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

prevailing in Guttur node was specifically brought to the attention of the

forum. NPCIL also via the their letter mentioned above cautioned about the

more aggravated situation which they anticipate in coming monsoon. There

have been a number of 400 kV line outages due to thigh voltages. MS,


SRPC requested KPCL that in case the reactor supply from BHEL is getting

delayed, then alternate arrangement such as diversion from some other

site/loan basis from some utility may kindly be explored in the interest of

smooth gird operation.

(Letter from MS,SRPC {with enclosed copy of letter received from

CE,Transmission, NPCIL} to Director (Tr), KPTCL and letter received

from Director (Tr), KPTCL dated 28th February 2013 are at Annexure-

3D)

b) Deliberations:

It was noted that once the tendering, which was planned in June-2013, was

completed it would take another 4 month time for execution. On a query from

SRLDC that whether Hoody reactor was filled with Nitrogen gas while in

storage, KPTCL answered that the reactor was filled with oil according to the

instructions of the OEM as the storage duration was longer.

3.5 Draft Procedure for Transmission Elements Outage Planning

a) Issue:

Outage coordination has been one of the important functions of RPCs,

RLDCs and NLDC. It constituted the first stage of operational planning.

Proper coordination of transmission element outage is important for network

reliability and security. The importance of outage coordination has been

emphasized in the recommendations of Enquiry Committee which went into

the Grid Disturbance on 30th and 31st July 2012. In view of the above and

based on the experience so far, a draft procedure for transmission elements

outage planning had been prepared by NLDC and it was also desired that

procedure may be discussed in the forthcoming OCC meeting of the region.

( Annexure-3E)

b) Deliberations:

i. MS i/c suggested that the results of the studies could be made

available on the website for inviting the commends from the

constituents. SRLDC said that as all the states were equipped with M/s


Siemens supplied PSS software, there could be a videoconference

based discussion on the system studies output.

ii. KPTCL desired that scope for opportunity shutdown (that was

maintenance of one element due to the outage of another associated

element) be included in the outage procedures.

iii. MS i/c requested the states to forward their comments within a week

time for submitting the same to NLDC.

3.6 NPCIL Units- Shut Down Program

a) Issue:

The outage plan for AOH of NPCIL stations are as follows:

• MAPS Unit II(220 MW): from 2nd March 2013 to 29th March2013.

• KGS Unit IV(220 MW) : from 28th Feb 2013 to 4th April 2013.

TNEB availability loss due to these outages: 220/375 MW.

Director Operation via his letter had brought out the precarious power supply

position of TNEB and requested SRPC to kindly take up this issue with NPCIL

and ensure scheduling outages of NPCIL Units only during June to December

except in October in future. (Annexure-3F)

b) Deliberations:

KGS informed that the shutdown of units was being planned by its HQ (Head

Quarter) on an all India basis. The request of OCC forum for scheduling the

shutdown during non-summer months would be conveyed to the management.

It was noted that March, April and May months were the peak demand months

in southern region.(June, July, August being in the northern region) SRLDC

said that planned unit shutdown be avoided during the summer months. It was

noted that presently two of the NPCIL units in SR – one at MAPS and one at

KGS – were under shutdown.

3.7 Loss of Generation from NTPC, Talcher II Station

a) Issue:

TNEB had informed that SR especially Tamil Nadu were in precarious power

situation. Demand- Supply gap is being managed by R&C measures. It was


also brought to the notice that generation level at Talcher Stage II had been

reduced drastically to 1400 to 1700 MW and requested that all possible efforts

may kindly be taken immediately in maintaining full generation at Talcher

Stage II from 1st March 2013 to 31st May 2013. (Annexure-3G)

b) Deliberations:

i. NTPC informed that the supply at present was below 80% and despite

only with 2 days coal stock, the generation had been maximized. It was

noted that from April onwards, though coal import would go up but the

domestic coal supply could decrease. NTPC narrated the problems

being faced by the plant in getting the coal supply continuously –

problem like diversion of the wagons to other plants, absence of

workers from 10AM to 4PM in the coal mines due to heat etc.

ii. TANTRANSCO also drew the attention of the forum to lower generation

on account of general strike on 20th, 21st, and 26th of March, 2013

and expressed great difficulty in facing the demand in the state.

iii. KPCL stated that the coal had to be received continuously at the power

plant to maintain the plant availability. It further said that they had

positioned watchers at vantage points and junctions to monitor the rake

movements. This showed the amount of coordination involved.

iv. MS i/cinformed that Chairperson, SRPC had addressed a letter to

Secretary(Coal) requesting senior officials from coal companies to

attend the SRPC meetings as Special Invitees.

v. SRLDC opined that if reduced availability on account of coal shortage

was known in advance, ATC margin and other power purchase issues

could be fine-tuned. KPCL replied that even the quality of coal being an

issue, it would be impractical to submit details well in advance.

vi. TANTRANSCO brought to the notice of the forum that whereas

Simhadri-1 & 2 units (meant for AP state only) were running on full

load, Simhadri-3 & 4 units were being affected on account of coal

shortage. It was requested by TANTRANSCO that all the units were


treated uniformly. NTPC stated that in many instances AP was able to

arrange for coal diversion to Simhadri 1 & 2 units.

3.8 Annual Outage for 2013-14: Request from APTRANSCO

a) Issue:

• APTRANSCO videletter dated 27.02.2013 addressed to MS, SRPC had

informed that APGENCO units would be released for Annual Overhaul

based on the inflows to hydel reservoirs and Power Supply Position in

AP. It was also requested that ISGS Units plan their outage during the

period June 2013 to December 2013.

• APTRANSCO vide letter dated 27.02.2013 addressed to GM, Simhadri

STPS with a copy to SRPC had informed that outage proposal of Simhadri

Stage I Unit II(20.09.2013 to 19.10.2013) would be considered based on

receipt of inflows into major reservoirs only (Annexure-3H).

b) Deliberations:

The issue was noted.

4 Follow up Issues

4.0 Sudden Change in drawal

a) As per Clause No.5.2.(j) of IEGC Regulations no User/SEB shall cause a

sudden variation in its load by more than 100 MW without prior intimation

to and consent of the RLDC. Instances of change in drawal by more than

100 MW have also been enclosed in the SRLDC letter.

(MS I/c, SRPC letter dated 27.02.2013 addressed to all the constituents

enclosing ED, SRLDC letter dated 25.02.2013 is at Annexure-4A)


b) Deliberations:

Issue was noted by the forum and constituents were requested to list the

actions taken by them.

Earlier Deliberations:

• 80th OCC Meeting:

a) SRLDC said that it cannot allow over drawal above 150 MW since

RGMO and UFR (defense mechanism) were not providing the desired

relief/ support in the region. Even though the grid frequency was above

50.2 Hz and there was loss of any major generation, then the frequency

would come below 49.5 Hz and it would take about 20 – 30 minutes to

curtail the overdrawal.

b) TANTRANSCO had informed vide their letter dated 10th January 2013

about the constraints in this regard. The sudden change in drawal is

mostly during the changeover period of load shedding in which a

quantum of around 1000 to 4000 MW is being normalized and shed at

that instance. Removal or addition of load is a programmed load

shedding pattern to manage the acute deficit. With a grid of about

10000 MW and infirm wind power of 4000 MW and deficit of 4000 MW,

it was difficult to adhere to the schedule without momentary changes.

TN had also requested SRLDC to explore a common methodology to

curtail load variation within 100 MW and circulate the same to all the SR

constituents. SRLDC stated that scientific load forecasting would be the

solution.

c) KPCL stated that above 50.2 HZ, RGMO would not be in operation, but

only FGMO. KPTCL also requested that the Type A,B & C messages

being issued be segregated for frequency above 50 Hz and for

frequency below 50 Hz. KPTCL had got Type A messages, even during

high frequency conditions also. SRLDC stated that Type ABC message

generating logic/ process was common in all the RLDCs, and hence it

would not be feasible to change the logic exclusively for Southern

Region.


d) Karnataka stated that the flow on 220 KV Kadakola – Kaniyampetta line

during evening peak be reduced from 150 MW to 80 MW due to over

loading of PGCIL’s ICT at Bastipur. It also informed that as the mini-

hydel projects in that region could not generate around 300 MW power

(including a loss of 250 MW in Cauvery basin), the line loading had to

be reduced. SRLDC suggested that CESC/ KPTCL may consider

augmenting the transformation capacity in that area as a long term

solution.

e) KPTCL informed that CESC was not getting its due share from the grid

and was carrying out load shedding. It requested that at least 3 hours in

the evening peak, the line flow could be below 100 MW. SRLDC said

that in the recent meeting of SRPC, it was agreed that KSEB could

draw 150 MW on that line.

4.2 RRF (Renewable Regulatory Fund) Mechanism

a) Issue:

Hon’ble CERC has directed that RRF Mechanism shall come into effect from

1St July 2013 and mock exercises for forecasting & scheduling to start w.e.f. 1st

February 2013. A meeting was held to address this issue at SRPC Bangalore

on 24th January 2013.

b) Deliberations:

i. MS i/c requested the concerned states to cooperate and furnish the

weekly data for the mock scheduling exercise, without further delay.


• 80th OCC:

SRLDC said that Karnataka had only furnished the data of schedules

(Totaling to 32 MW, SCADA MW data for 1st and 2nd February 2013. Data

of 7 wind farms had been received (Tuppadahalli, Gamesa, Doddanavar,

SUZLON Kalamangi, SUZLON Sidenur, SUZLON Herada-Guttal,

Harpanahalli). The other constituents were requested to submit the data in

the required format.


4.3 Discrepancy in availability of load relief through protection schemes: KSEB System

a) Issue:

Load available for relief through AUFR and df/dt as declared by KSEB: 1032

MW; Load(feeders) available for monitoring at SRLDC: 687 MW; There is

considerable discrepancy between SLDC and SRLDC observations. SRLDC

had requested KSEB to furnish soft copy of minute wise data for the monitoring

feeders for the period 01.02.2013 to 07.02.2013 for analysis and discussion in

the 80th OCC meeting.

b) Deliberations:

It was noted the corrective action from M/s GE was awaited..


• 80th OCC:

SRLDC had informed that there was considerable discrepancy between

SLDC and SRLDC observations and had requested KSEB to furnish the

soft copy of the minute wise data for the monitored feeders for the period

1st February 13 to 7th February 13. It was agreed that the matter would be

discussed in the next meeting of OCC.

4.4 Load-throw off due to system frequency variation: RTPS units. a) Issue:

It was informed by KPCL that Unit 6 of RTPS experienced load throw off to an

extend of 50-60 MW on 13th January at 1800 hrs, & on 14th January 2013 at

1800 hrs, 2030hrs and 2115 hrs. And also cautioned about the possibility of

cascade tripping of other units.

b) Deliberations:

i. KPTCL said even under high frequency condition,utilities were being to

contain the over drawl below 150 MW for their control area. SRLDC

stated that frequency excursions were resulting due to load change

over etc caused by a number of utilities. KPTCL further said while the

frequency was above 50.6 and to keep over drawl below 150 MW,


hydro generation had to be increased in their system. KSEB queried

over controlling the over drawl below the regulation specified limit in the

absence of hydro sources etc in that state control area. KPTCL desired

that till the frequency comes to IEGC limit some flexibility required in

drawl. An incident of forced load throw off of 500 MW in AP system that

resulted in raising frequency above 50.58 Hz was quoted by KPTCL.

KSEB said that if thermal units were at full load while hydro units were

not there, then there would be limited response to frequency excursion.

SRLDC clarified that generator had to come to schedule within 2 to 3

minutes after the disturbance and during that period no violation

message would be issued.


• 80th OCC:

a) KPTCL informed that it would submit the reasons for load throw off.

b) KPCL expressed that such occurrences be reduced since it affected the life of the turbine blades.

c) KPTCL was requested to make a presentation on load thrown off in the next OCC meeting.

4.5 Coal Stock Position

a) i. 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. Daily Coal stock position report as on 28th February, 2013 as downloaded from CEA website is furnished at Annexure–4B.

ii. It was noted that the coal stock position in Rayalaseema, Simhadri, Raichur, Bellary, Ennore, North Chennai, Vallur, and Talcher stations were less than for 7 days generation.

iii. As coal stock position continued to be low, states were requested to implement appropriate demand side management considering lower availability due to coal shortage.

b) OCC had again requested NTPC to furnish the information in the format as given at Annexure-4C.

c) Coal Stock position as furnished by States is at Annexure – 4D.


4.6 Physical and Cyber Security in power supply

a) In the Meeting, MS i/c emphasized the urgent need for proper and effective

cyber security measures to be in place. He requested the utilities to examine

this matter and revert back about the same to SRPC Secretariat.

b) Earlier deliberations:

• In the 78th OCC Meeting (afternoon session), Shri M. Coumarane, EE (Elect), NLC, Neyveli gave a presentation on Cyber Security aspects. He covered data communications and security mechanisms/algorithms with relation to cyber security measures. He also stressed the need for physical security measures such as controlling/restricting computer pen drives, especially in the SCADA environment. He suggested that suitable security assessment needed to be carried out for each environment and security policies framed and adopted. He also informed that tools such as password crackers and packet analyzers were available to hackers, who were capable to cause much damage to the power network data. He also cited some attacks on SCADA systems that had taken place around the world. He also stressed the need for association of the power utilities with research institutes for developing and deploying cyber security measures. On a query from audience whether wireless modes are also at the risk of hacking, he answered affirmatively.

• In the 77th OCC Meeting, it was also noted that the Enquiry Committee in its report had stressed the need for improved telecom infrastructure for cyber security.

• In the 75th OCC meeting, it was noted that the Enquiry Committee which had gone into the recent disturbances in NEW grid in its report submitted to MoP had emphasized the need for improved telecom infra-structure for cyber security. It was also stated that for smooth operation of grid systems, it was absolutely important that all the power generating and distributing stations are connected on a very reliable telecom network. The recommendations suggested are given below:

i. A proper network may be built up preferably using MPLS (Multi-Protocol Label Switching) which is simple, cost effective and reliable. In remote places where connectivity is a problem, the stations can be use dedicated fiber cable from the nearest node.

ii. Since POWERGRID has its own fiber optic cables, practically covering all major nodes and power stations. A proper communication/IT network may be built using dedicated fibers to avoid any cyber-attack on the power system. CTU and STUs had been requested to complete the process within a time frame of one year.


4.7 SPS for 400 KV Vijayawada – Nellore Line

In the meeting, APTRANSCO stated that its management had to decide on

the further course of action. Commercial implications may also need to be

discussed and finalized. APTRANSCO was requested to discuss with the

balance IPPs and finalize the matter at an early date.


It was informed that signal to LKPL had been extended. Signal was to be

extended to other generators in Vemagiri Complex. It was also noted that

GMR had agreed to the scheme. PGCIL/APTRANSCO were requested to

please expedite the commissioning of the SPS scheme. AP was also

requested to coordinate with balance generators.

4.8 Implementation of the remedial measures suggested by the Enquiry committee

a) In the 79th OCC Meeting, it was noted that the Protection Audit in respect of

the identified critical sub stations has been completed in SR during the

month of December-2012.The observations during the audit had been

compiled and discussed in the Protection Committee meeting held on

19thDecember-2012. Utilities had been requested to kindly furnish the action

plan and also the cost estimates for implementation.

b) In 78th OCC Meeting, the matter regarding Remedial measures

recommended by Enquiry committee on NEW grid disturbance was

discussed. As noted in earlier meeting, Chair Person, SRPC & Chairman,

TNEB had addressed a letter to SRPC Members in this regard. The same

had also been discussed in the Special TCC Meeting held on 08th November

2012. Member Secretary i/c requested that utilities may kindly furnish the

progress of implementation measures on a regular basis to SRPC

Secretariat enabling CEA to be informed accordingly.

4.9 Mock Exercise for implementation of RRF (Renewable Regulatory Fund)

a) It was noted that Hon’ble CERC had earlier directed to commence mock

exercise for the implementation of RRF w.e.f. 1st July 2011. SRLDC had

taken up the issue with beneficiaries vide letter dated 5th July 2011


requesting them to make necessary arrangements. The actions needed to be

initiated by the States had also been listed.

b) The issue had also been taken up at TCC/SRPC forums. SLDCs were the

nodal/ focal points for collecting the information in the States. Constituent

states had been requested to furnish the relevant information to

SRLDC/SRPC Secretariat. It was noted that a Task Force had been set up

by MNRE vide OM dated 28th March 2012 to resolve various issues relating

to implementation of RRF mechanism under the Chairmanship of CEO,

POSOCO. The Task Force was to finalize and submit its recommendations

within a period of three months of the OM. The Task Force had submitted

the report on 04.09.2012.

c) In the 80th OCC meeting it was noted that Hon’ble CERC vide order dated

16th January 2013 had directed that RRF Mechanism shall come into effect

from 1St July 2013 while mock exercises for forecasting & scheduling was to

start w.e.f. 1st February 2013. A meeting with the SLDCs had also been held

at SRPC Bangalore on 24th January 2013.

4.10 Crisis Management Plan/Black Start Procedures

a) Requirement of synchronizing facility at critical substations:

Details are furnished in Annexure – 4E.

b) Mock drill for black start procedure:

Details are furnished at Annexure–4F.

c) Deliberations: i. It was noted that similar to Kerala, AP had also submitted procedures

for black start mock drill for hydro plants from point to point. SRLDC informed that the submitted procedures would be studied and comments/corrections would be offered.

ii. SRLDC pointed out that though Karnataka had given procedure for point to point mock drill exercise, but report on the completed mock drill was not received by them.

iii. KPTCL/KPCL informed that during the mock drill of Kadra - Kaiga line, Kaiga plant was not availing the auxiliary load and only Karwar load was used. KGS expressed that due to the complexities of the nuclear power plant auxiliary load could not be given for the exercise. However, NPCIL-KGS agreed to consider the request of auxiliary load


using the Kadra power during the mock drill exercise. SRLDC suggested that when the unit was coming back after the shutdown, point to point mock drill could be conducted covering the auxiliary load of the plant. KPCL suggested that CWP load of 8 MW could be put to use one day before the synchronization for conducting point to point mock drill. It was noted that KGS 1 & 2 were connected to 220 kV system while Unit 3& 4 were connected to 400 kV system. It was further noted that KGS unit-4 would be coming up by 31st March, 2013. It was noted that Kadra-Kodasalli mock drill would require around 20 MW load.

iv. SRLDC informed that as per the mock drill conducted earlier on Gajuwaka – Jeypore line, start-up AC supply was given from Gajuwaka to Jeypore (ER) on after grid disturbance on 31.7.2012 by passing the HVDC B/B system. It was noted that during the process around 26 isolators were closed/opened within 20 minutes time.

Earlier deliberations:


i. It was noted and appreciated that KSEB was carrying out effective point-to-point mock drills for black start restoration of its power plants.

ii. SRLDC said that the List of Coordinators for Disaster Management needed to be checked and updated if necessary by the utilities.

iii. TANTRANSCO informed that facility to synchronize the evacuation lines (from hydro station) at 110 kV bus of 230 kV Kayathar S/S had been commissioned for 110 kV Kodayar feeder & Suruliar feeder on 21.11.2012 and also for 110 kV Periyar and Papanasam feeders on 14.12.2012.

4.11 SCADA points related to NTPC Talcher to be available at RLDC (Correspondencein this regard at Annexure-4G)

Deliberations:

In the meeting, GM, NTPC assured that he would look into the matter and

come up with fruitful results. It was again noted that the onus of making

available the required data to RLDC was with the user.


• 80th OCC meeting:

It was noted that all data (except transformer taps) was being transmitted

to ERLDC. SRLDC informed that bus data was being received but not the

generator data. NTPC Talcher assured that it would make all efforts in

ensuring data availability to SRLDC.

• 79th OCC meeting:

i. SRLDC stated that though data such as active power (P) pertaining to

Talcher plant was being received by NLDC, other data such as reactive

power (Q) and unit-wise generation data etc were not seen by NLDC.

MS i/c pointed out that despite a Meeting of the concerned officials

taking place recently, the issue of providing Talcher data at SRLDC

was yet to be resolved. NTPC stated that the job had been entrusted to

ERTS which had to complete this task.

ii. PGCIL clarified that as per recent decision of Powergrid Management,

there was no policy for allowing dual reporting by any RTU to more than

one LD centre. In view of this clarification of POWERGRID, NTPC was

requested to initiate further necessary action in this regard.

Various grid operations related issues were discussed. The Grid operation

data for the month of February-2013 is enclosed as Appendix - A.

5.1 Grid Events

i. Generation Capacity added (Annexure-5A)

ii. Transmission lines added (Annexure-5A)

iii. New Substations added (Annexure-5A)

iv. Existing Substations augmented (Annexure-5A)

SRLDC had requested the states to peruse the projected consumption

figures etc. in respect of their systems as given in the 18th EPS for the

purpose of planning of their intra transmission system etc.


5.2 Facilitation of Inter-State/Inter-Regional transfer of power

a) Bilateral energy exchanges

On a review of the bilateral exchanges made by the constituents and also by the embedded IPPs during February-2013, the following was noted:

Import:

From NEW grid (inter-regional) From SR • Andhra Pradesh • Kerala • Tamil Nadu

• Andhra Pradesh • Kerala • Tamil Nadu

Export:

To NEW grid (inter-regional) To SR

Nil • Karnataka

b) Details of Energy interchanges between the constituent systems and exchanges with other regions (as per PSP) are given at Annexure—5B.

c) It was also noted that Andhra Pradesh, Karnataka, Kerala & Tamil Nadu had furnished the relevant details regarding exchanges through the Power Exchanges (Annexure – 5C).

5.3 Utilization of inter-regional links

SRLDC also presented details of the utilization of inter-regional links for the month of February-2013 is at Annexure – 5D.

5.4 Automated Defense Plan

In the meeting constituents were requested to appraise the forum about the status of Action Plan on implementation of Automated Defense Plan proposed.



It was noted that in the Special TCC meeting held on 11th and 12th of February 2013, the Grid Security Expert System and views of the constituents about the same had been discussed in detail and recommendations finalized.

79th OCC Meeting:

SRLDC had presented Automated Defense Plan document released by NLDC wherein PLC (Programmable Logic Controller) based Expert System were planned for control of the power system elements from the SLDC/RLDC/NLDC. Constituents had been requested to kindly peruse the same.


5.5 Transmission Network and Generation issues a) SRLDC highlighted the following Issues:

• Less Generation by Talcher STPS, SEPL, MEPL

• High Line Loading of Hosur-Salem and Somanahalli ICTs

• Line Loading Limits as formulated by CEA had been circulated to all

• Delay in availing outage / Restoration of Transmission elements

• Carrying out works on Transmission elements without prior intimation / consent of RLDC.

b) SRLDC requested the Members and utilities to avoid similar instances in future and strictly adhere to the Grid Code.

6 Frequency Profile

6.1 Grid frequency

a) Frequency profile during February-2013:

• Frequency remained within IEGC range (49.7 – 50.2 Hz): 88.42 % o Previous month (January-2013): 91.41 % of time

o Same month last year (February-2012): : 94.34 % of time

• Frequency remained below 49.7 Hz band for 9.32% of time

• Frequency remained above 50.2 Hz for 2.26% of time

• Average frequency was 49.87 Hz.

b) Frequency histogram & Frequency duration curve (Annexure – 6A).

6.2 High Frequency Grid Operation

a) Deliberations:

Andhra Pradesh said that due to large scale power cut of around 50-60 MU

per day, frequency spikes were unavoidable despite load staggering. SRLDC

said that demand side management had to be automatic instead of manual

control. TANTRANSCO said that TN system was having about 10,000 MW

demand, 4000 MW shortage ( load shedding) and 4000 MW wind power. It

was informed by TANTRANSCO that every hour around 3000-4000 MW load

was being shed and action was being taken to manage the loads. KPCL


stated that due to frequency excursions generating machine life

getsaffected.. Karnataka was appreciated for not receiving any violation

messages during February-2013.


• 79th OCC:

i. SRLDC stated that in accordance with 5.2 (j) of IEGC Regulations, real time message is being issued for violations. KPTCL requested that the frequency should also be mentioned in the messages issued to the constituents; SRLDC replied that the message contents were in accordance with IEGC provisions.

ii. KPTCL said that since about 2500 MW of their generation was on FGMO, resulting generation change, by more than 100 MW due to frequency deviations was inevitable. It further said that STOA was granted for a particular time period and the schedule itself varied by more than 100 MW at times. SRLDC stated that staggering of STOA transactions and also of the load might address this issue. SRLDC suggested that schedule change could be planned below 100 MW and in case the constituents were aggrieved by any of the IEGC provisions, they could approach the appropriate forum for redressal.

iii. Kaiga also brought to the notice of the forum that Turbo Generator set of KGS Unit 4 was experiencing high vibrations due to high frequency during load change over at 1800 hrs for about 5 to 10 minutes.

iv. SRLDC said that constituents needed to incorporate appropriate ramp up/down in schedule itself. SRLDC further said that loads were not being scientifically forecasted by the utilities. Mostly the loads were being met on “as and when”basis without adequate advance planning, resulting in frequency excursions.

• 78th OCC:

i. Load changeover: It was stated by SRLDC that load changeover and resulting frequency excursion instances were occurring at the end of almost every hour within the constituent. SRLDC brought to attention the provisions of clause 5.2 (j) of IEGC. No user was to cause sudden variation in its load by more than 100 MW without prior intimation to and consent of the RLDC. Similarly no user should reduce the generating unit output by more than 100 MW without prior intimation to and consent of the RLDC. Member Secretary I/c, SRPC, requested the co-operation of all the constituents for strict compliance of clause 5.2 (j) of IEGC.

ii. SRLDC re-iterated that implementation of Automated Demand Management is very much essential in view of growing complexity of power system operation.


6.3 Pump mode operation of Kadamparai and Srisailam

It was noted that Kadamparai & Srisailam machines had not operated in pump

mode during February-2013.

6.4 Low Frequency Grid Operation

a) Low frequency operation

i. Member Secretary i/c, SRPC said that the frequency of operation of the Southern Regional Grid had been less than 49.7 Hz for about 9.32 % of the time during the month of February-2013.

ii. SRLDC stressed on proper management of load generation balance in real time and highlighted the remedial measures to be pursued to curb low frequency operation.

iii. SRLDC also emphasized the need for effecting Demand side Management as per the Grouping of Loads details furnished by SR constituents.

iv. Strict compliance action in response to SRLDC messages (Type – A, B, C) and also reporting details of compliance through a reply message was also emphasized.

b) Grid Code violation messages

i. Details of caution/violation Type A, B & C messages issued by SRLDC to the constituents during the month of February-2013 are furnished at Annexure – 6B.

ii. Details of 12% violation messages pertaining to Over Drawal / Under Injection while the frequency was below 49.8 Hz over a time block are furnished at Annexure – 6C.

c) Measures by constituents to improve the frequency

i. APTRANSCO:

• Load shedding up to 4321 MW amounting to about 1449 MU had been carried out during February-2013.

• APTRANSCO informed that even with purchases and resource management, the State had to face demand & energy shortages.

• Details of Load relief imposed during the month are furnished at Annexure – 6D.


ii. KPTCL: • KPTCL informed that load shedding up to 2700 MW amounting to

about 812 MU during February-2013 had been carried out in the State.

• Strict grid discipline was maintained during the month and the state had generated more power from hydro sources whenever possible and supported the grid during periods of low frequency.

iii. KSEB:

• Need based load shedding up to 550 MW amounting to about 100 MU had been carried out during February-2013.

• KSEB informed that with purchases they were able to maintain load generation balance in their system.

• Measures taken by KSEB to maintain grid discipline include cyclic load restrictions and switching off of identified radial feeders as directed by SRLDC.

• All HT & EHT consumers shall limit their energy consumption to 75% of their base average consumption in the previous year. Penal rate beyond the limit.

• All domestic consumers attract penal rate for monthly consumption above 300 units.

• All non-domestic LT consumers limit their consumption to 80% of their base average consumption in the previous year. Penal rate beyond the limit.

• Ban on usage of grid electricity for display lighting, hoarding, external illumination of buildings and other publicity and sales promotion purposes.

iv. TANTRANSCO:

• TANTRANSCO said that load shedding up to 3580 MW amounting to about 1259 MU was carried out during February-2013.

• They briefed about the load restriction measures in their system during the month which is given below:

40% in respect of HT Industrial and Commercial consumers

2 hour Load Shedding for Chennai (from 0800 to 1800 hrs.)

3 hour Load Shedding for urban and rural Areas (from 0600 to 1800 hrs.)

10% peak hour restrictions to HT and Commercial consumers.


Agriculture was being fed 6 hours of three phase supply in day time and 3 hours of three phase supply in night time.

6.5 Loss of generation/ Frequency Response Characteristic

a) SRLDC stated that Loss of generation due to coal shortage /technical problems needed to be furnished for onward transmission to NLDC by 10.00 hrs on a daily basis.

b) Further split-up details of Non-Conventional Energy Sources generation for Solar, biomass, wind, & small hydel in monthly data should be provided.

7 Voltage Profile

7.1 High Voltage a) High voltage graphs for the month of February-2013 are at Annexure-7A.

b) It was noted that the following nodes were facing high voltages:

• Guttur (431 kV) • Hyderabad (433 kV) • Karnool(435kV) • Khammam(430 KV)

• N'Sagar (433 kV) • Raichur (429 kV) • Srisailam (433 kV) • Vemagiri(433 kV) • Vijayawada(437kV)

c) There had been 49 tripping due to over voltage of 400 kV lines during the

month.

d) The following lines had been kept open for more than 3 days due to over

voltage situation:

AP: Vemagiri-Simhadri I Vijayawada-Vemagiri I&II Vijayawada-Lanco I& II

KA: • Hassan-UPCL II

KL:

Nil

TN: • Tirunelveli- Kudankulam I, II, III & IV • Udumalpet-Thirunelveli I

e) The following were noted in the earlier Meetings:


As suggested in the last (78th) OCC meeting by SRLDC for a special meeting with major generating stations to address the High Voltage & RGMO issues, a meeting was conducted on 09th January 2013.

It was requested that necessary action may please be taken to adhere to the IEGC regulations regarding RGMO performance and VAR absorptions by the units as emphasized in the Meeting.


• Earlier meetings: i. SRLDC had emphasized that Line opening would be the last resort

by SRLDC after receipt of message from the constituents. Details of measures taken needed to be communicated in the line opening request message.

ii. SRLDC had requested all the Regional Entities that the GT / ICT tap position of all High voltage locations shall be kept corresponding to the output voltage of 400kV. The action taken in this regard needs to be communicated to SRLDC & SRPC.

iii. SRLDC had also requested the generating stations in the High Voltage Zone to absorb MVAR as per Capability Curve limit.

7.2 Reactors a) Reactor commissioning schedule The updated information on schedule of commissioning of Reactors as

originally agreed in the Standing Committee on Power System Planning of Southern Region is furnished at Annexure – 7B.

b) Re-commissioning of Reactor at Guttur/other Reactors

In the meeting, it was suggested by the OCC forum that 50 MVAR reactor at

Hoody S/S could be shifted to Guttur for containing the high voltage problem.

It was noted that the reactor was of 1995 make and 3-phase type and the

required bay space was available at Guttur.


• 80th OCC:

In the meeting it was informed that due to a fire mishap in BHEL testing facility, the supply of bus reactors to Karnataka would be delayed by more than one year.

The issue regarding 50 MVAR line reactors on 400 kV Guttur-Birenahalli – I at Guttur S/S and 400 kV Nelamangala-Hiriyur – II at Nelamangala was discussed in the TCC meeting held on 29th April 2011 and subsequent OCC Meetings. KPTCL had been requested to take up this issue with Standing Committee on Power System Planning. Subsequently, CEE (LD), KPTCL had taken up the issue with CEE (P&C), KPTCL vide letter dated 13th June 2011. CEE (LD), KPTCL had informed that reply dated 23rd July 2011had been received from CEE (P&C), KPTCL. In view of the contents of the letter, the issue could be further deliberated at TCC level. In earlier forums it had been pointed out to KPTCL to take up the issue Standing Committee on Power System Planning.


c) Requirement of reactor at Vemagiri Complex

It had been noted that the requirement of reactor at Vemagiri Complex had been deliberated in earlier Standing Committee Meetings and APTRANSCO was to take a call on this issue. Further developments in this regard were awaited from APTRANSCO. SRLDC vide letter dated 12th June 2012 addressed to APTRANSCO had again requested that the commissioning of bus reactor at Vemagiri be expedited. APTRANSCO was asked to furnish the status of action in this regard.

7.3 Absorption / Injection of VARs by Generators (Annexure-7C)

a) In the meeting, NTPC Simhadri expressed concern over the persisting high

voltage around 420 kV. It was highlighted by NTPC that despite MVAR

absorption by its machines and changing taps of GT, the voltage profile was

causing concern. NTPC requested opening of lines to address the issue.

SRLDC stated that in the 79th OCC meeting, a format had been circulated to

the constituents. The same could be followed by NTPC.

b) 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.



It was noted that SRPC had sought the data from the generators of Vemagiri complex (nominal voltage with associated tap position and present voltage with associated tap position) for the month of December 2012. Data from some of the generators was awaited.


A study was carried out by SRPC on the data received from the generators of Vemagiri complex (nominal voltage with associated tap position and present voltage with associated tap position) for the month of November-2012. These observations were presented on a Special Meeting held on 09th January 2013 at SRPC.


i. Member Secretary i/c had stated that as decided in the last OCC Meeting, a meeting to address over voltage problems in Vemagiri Complex had taken place on 26th November 2012 at Jegurupadu with the participation of SRLDC, SRPC, APTRANSCO, & IPPs at Vemagiri complex. It was also noted that a letter seeking details of nominal voltage with associated tap position and present voltage with associated tap position for the month of November-2012 had been addressed to the concerned generators.


ii. SRLDC had recalled discussion on this issue in the last OCC meeting, and stressed that tap position had to be set corresponding to nominal voltage of 400 kV. PGCIL suggested that line opening could start at 420 kV itself.

iii. RLDC had reiterated that opening of lines on account of high voltage needed to be carried out prudently, since it would also resulted in network depletion.


i. SRLDC had expressed the concern about high voltage at 400 kV Vemagiri Complex and requested to change the GTs Tap Position to Nominal voltage i.e. 400 kV of Gas Stations connected to Vemagiri Sub Station. A Meeting had been scheduled on 26th November 2012 at Vemagiri which was to be attended by officers of SRPC and SRLDC also.

ii. NTPC had stated that despite most of its generating units absorbing reactive power, the high voltage situation in the grid could not be contained. NTPC requested the OCC forum to evolve a strategic guideline for MVAR absorption, reactor installation and opening of lines etc for containing persistent high voltages especially in the S1 bid area. The same had also been sought by the top management of NTPC.

iii. SRLDC had pointed out that reactor installation by NTPC at Simhadri and Ramagundam was pending for considerable period. The Tap Position should be close to 400kV of all GT’s / ICT’s .Further tap position of new generating units should correspond to 400kV before COD. It was also informed that despite generating about 350 MW, Simhadri IV was absorbing only 40 to 50 MVAR. NTPC said that since 2006, a number of grid elements had been added /removed from the grid but the high voltage situation was persisting. A review of reactive power requirement could be undertaken by conducting fresh study for identifying the quantum of compensation requirement and location. It was noted that SRLDC had earlier proposed additional reactors at seven locations. OCC agreed to recommend the proposed reactors at these seven locations as suggested by SRLDC to TCC/ SRPC for approval. SRLDC stated that on 31.10.2012, the day of cyclone ‘Nilam’, reactor at NLC was not there and the same was not informed to SRLDC too.

iv. SRLDC had stated that a time frame for changing the ICT/GT tap positions be decided. SRLDC stated that it was yet to obtain the tap changing information from VTPS. MS i/c informed that a Meeting was proposed to be held on 26th November.2012 with the generators in the Vemagiri Complex. The matter could thus be reviewed in the next meeting of OCC.


7.4 Low voltage

a) In the Meeting, SRLDC emphasized on the need of action plan to be made to avert low voltage conditions at Bangalore, Trichur, Palakad and Udumalpet during March 2013 and especially at Chennai, Bangalore and Trivandrum in the coming months.

it was again expressed that the utilities needed to install under voltage relays as mandated in IEGC Regulations to control low voltage conditions at the 400 kV nodes. It was noted that TN had agreed for low voltage protection relays and it was requested to intimate the details of implementation.

b) It was noted that voltages at nodes were mostly above 380 kV during February-2013 except at Udumalpet(373 kV) and Trichur(370kV)

c) It was also noted that in the 20th SRPC Meeting, the Committee had approved installation of Under Voltage relays as proposed by SRLDC.

d) It was noted under voltage relays were under implementation/study by Tamil Nadu while details from Karnataka were awaited.

e) Member Secretary i/c, SRPC requested the constituents to submit the action plan for implementation of Under Voltage Relay Schemes.

7.5 Capacitors

The progress of installation of HT shunt capacitors was reviewed and the details are furnished in Annexure – 7D.

8 System Protection

8.1 CEA's Grid Standards Provisions

As per Clause 9 of the Central Electricity Authority (Grid Standards) Regulations 2010, all constituents are required to furnish a detailed report of Operation of Automatic Under Frequency Relays (AUFR) at different frequencies (49.0 Hz, 48.8 Hz & 48.6 Hz) and df/dt relays (Group 1: 49.9 Hz., 0.2 Hz./sec instantaneous & Group 2: 49.9 Hz., 0.1Hz./sec) to SRLDC and SRPC on daily basis. In view of the above, vide SRPC letter dated 28.12.2012, all constituents had been requested to furnish the report to SRLDC and SRPC on daily basis. The same could also please be sent to SRPC E-mail id [email protected]. It was noted that Puducherry and KSEB were reporting the same on a daily basis. All other constituents were also requested to furnish the same on daily basis.

8.2 Under Frequency Relay

a) Trippings for the month of February-2013 are furnished at Annexure-8A.


b) Deliberations:

In the meeting ROP w.r.t. Petition 263/MP/2012(Maintaining and ensuing

Integrated, secured grid operation in SR in terms of regulation 5.2 of the

CERC Indian Grid Code Regulations 2010 and compliance of regulation

5.2(n) and 5.4.2(e) of the IEGC by providing adequate load relief through

AUFR and df/dt schemes during contingencies) were deliberated. It was

noted that the AUFR and df/dt relays in SR were generally healthy and

were in operative condition and the settings were as per the scheme

specified by SRPC. However the loads available for relief in the identified

feeders were far below the value declared by the constituents. It was noted

that the Commission had directed that the issue should be discussed in

RPC level meeting to decode the quantum of load which should be

increased to give desired result in a time bound manner. It was also noted

that quarterly report had to be submitted to CERC by SRLDC. The issue

had also been discussed in the recent SRPC meeting. It was decided that

an action plan would be sent within 10 day by the constituents (ROP at Annexure – 8A 1).

c) Earlier deliberations With reference to AUFR, the following was noted in the Special TCC

meeting held on 11th & 12th February, 2013:

i. It was noted that SRLDC was continuously monitoring all feeders connected with AUFR and df/dt protection w.e.f. 23rd September 2012. They were also preparing a Report based on this monitoring and submitting the same once in every ten day as to Hon'ble CERC as well as to constituents. This was being done to ascertain the level of protection available in the system in the event of contingency. SRLDC had also been stating that it could be observed that the extent of protection available was not adequate to ensure safe and secure grid operation.

ii. APTRANSCO in the special TCC meeting held on 11th and 12th 2013, stated that there was no RTU coverage in respect of certain feeders. They also said that they had increased the number of UFR feeders by about 300 MW which will be confirmed for implementation in about a month's time. Hyderabad loads had also been covered under Stage III of the AUFR scheme.

iii. TANTRANSCO stated that all the AUFRs in the state were operating properly and periodic testing was also being done. However, due to heavy amount of load shedding being carried out in


the state, the desired number of feeders was not available for AUFR operation.

iv. KSEB said that the average percentage availability figures in respect of Kerala system was of the order of 67.57 %(average) with minimum and maximum availability of 45.2 % and 86 % respectively, with the present loading pattern.

v. KPTCL said that the percentage availability in respect of their system was the highest amongst all the states in the region.

c) It was noted that in the 20th SRPC Meeting, the Committee had approved the revised AUFR settings for implementation. It had also been agreed that the Constituents would implement the new UFR settings within a period of one month (by 1st November, 2012). It was noted that all the utilities had confirmed that the revised UFR settings had been carried out.

8.3 df/dt Protection System

Tripping details for the month of February-2013 are furnished at Annexure – 8A.

8.4 Inter-trip Scheme for SPS

The tripping details for the month of February-2013 as furnished by the constituents are at Annexure – 8A.

8.5 Protection healthiness certification

In the meeting, SRLDC requested the constituents to submit the healthiness

certificates for protection system. It was noted that KPCL, KPTCL, NLC, LANCO,

and TALCHER had submitted the certificates.


a) SRLDC stated that reports in respect of the Monthly Declaration of availability & Healthiness of various protection / defense mechanism were awaited from most of the utilities.

b) MS i/c requested that the relevant details be submitted in the monthly OCC meetings.

9 Generation

9.1 Normative Vs. average actual ex-bus generation at Annexure – 9A.

9.2 IPP Generation/Utilization

OCC was apprised of the PLFs of the IPPs operating in Southern Region during the month of February-2013 at Annexure – 9B.


9.3 Wind Generation

a) Details of wind generation for the Southern Region, Tamil Nadu and Karnataka for the month of February-2013 are given at Annexure – 9C.

b) Deliberations: In the meeting, TANTRANSCO stated that it was planning for 400 kV system

for evacuation of wind power. SRLDC pointed out that only about 200 MW of

wind power of Tamil Nadu was covered under RRF mechanism.. Further

SRDLC informed that almost all of the 230 kV lines in Tamil Nadu were

loaded more than 120%. Evacuation of wind power would be constrained

once Kudankulam units started generation.


• In the 78th OCC Meeting, SRLDC stated that SPS for containing overloading of 230 KV lines for wind evacuation should be put in place by TN. Evacuation of wind generation was an issue especially after the Kudankulam generation picked up. TANTRANSCO stated they had devised effective manual intervention schemes and number of substations and lines were under execution on fast-track mode. SRLDC stressed that the remedial action needed to be automated.

• TANTRANSCO had earlier been requested to devise suitable Contingency arrangements to address wind variations. TANTRANSCO had stated that it was carrying out adequate quantum of load shedding to manage such contingency. KPTCL had informed that shortfall from wind energy was being compensated through increased generation from UPCL and BTPS.

9.4 Annual Generation Targets

a) Year 2012-13: Review of Annual Generation Targets (forecast)

i. Review undertaken by SRPC

(1). Annual Generation Targets for the year 2012-13, as approved by MoP is at SRPC Website as 148th LGBR (April 2012 – March 2013).

(2). Annual Generation Targets are being reviewed every month in comparison with the actual generation. The % variation details are given in the following Annexures for the month of February-2013:

o Annexure – 9D: Availability & Requirements o Annexure – 9E: Gross generation (category-wise)

(3). Moreover, Annual generation Targets were reviewed quarterly to prepare the following LGBRs and uploaded in the SRPC website (www.srpc.kar.nic.in) under the menu link "Home All Uploads


Operation LGB Report".

o 149th LGBR (July 2012 – March 2013) o 150th LGBR (October 2012 – March 2013) o 151st LGBR (January 2013 – March 2013)

ii. Review undertaken by CEA

(1). CEA has been monitoring the performance of all generating stations in the country with a view to improve the availability of power in the country.

(2). It was also requested that strategy/action plan decided to increase generation so that the loss of generation suffered during the period April 12 to February - 2013 be made up during the remaining period of the year 2012-13.

b) Year 2013-14: Annual Generation Targets

The preparation of Final Report based on Annual Generation Targets for the year 2013-14 is under process.

10 Availability & Consumption

10.1 Anticipated Availability and Consumption

a) The anticipated availability and consumption as furnished by the states for the next two months – March-2013 & April-2013 - are furnished in Annexure – 10A.

10.2 Review of the availability during February-2013

The anticipated availability as furnished in the 80th OCC against the actual availability is at Annexure – 10B.

10.3 Maximum demand met & Average daily consumption (Annexure – 10C)

10.4 Daily consumption patterns (Annexure – 10D)

10.5 Load duration curve (Annexure – 10E)

10.6 Drawl Extremes (Annexure – 10F)

10.7 Minimum to Maximum demand ratio (Annexure – 10G)

10.8 Hydro Availability (Annexure – 10H)

It was noted that hydro storage was 1,400 MU less than last year [= 6,607 – 5,207] as on 28th February-2013.


11 Outages

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

during the month of February-2013 (Annexure – 11A). It was noted that the forced outages of thermal units had varied between 1.96 and 7.87 % during the month of February-2013.

11.2 Prolonged outages a) OCC was apprised of the prolonged outages in the Southern Region during

the month of February-2013 (Annexure – 11B).

The following was noted in the earlier Meetings:

i. SRLDC had expressed concern over prolonged outage of Srisailam pumps and installation of reactor at Guttur.

ii. SRLDC requested the constituents to furnish the detailed action plan for restoration of elements under prolonged outage.

11.3 Annual Outage Plan a) Year 2012-13: Review of Annual Outage carried out

i. As per the IEGC Regulations, the annual outage of Generating Units carried out (actual) during the year 2012-13 is being reviewed quarterly and compared with the 'Annual Outage Plan – 2012-13', (also uploaded in SRPC's website). The review report is being submitted to Hon’ble CERC as 'Outage Deviation Report' on a quarterly basis.

ii. The following Outage Deviation Reports have been uploaded in the website of SRPC www.srpc.kar.nic.in under the menu link "Home All Uploads Operation Outage Reports to CERC".

o Outage Deviation Report for the period April 2012 to June 2012

o Outage Deviation Report for the period April 2012 to September 2012.

o Outage Deviation Report for the period April 2012 to December 2012.

b) Year 2013- 14: Annual Outage Plan:

In the 80th OCC Meeting, Draft Report on Annual Outage Plan for the year 2013-14 had been circulated along with the Analysis Report on the Outage Plan in respect of Generating units and Transmission elements, prepared on the basis of the recommendations of Kukde Committee.


11.4 Shutdown carried out (last month) a) Generating Stations

Details of generating units under shut down (forced as well as planned) during the month of February-2013 are enclosed as Annexure - 11C.

b) Transmission lines and ICTs

i. The planned maintenance of elements carried out by PGCIL/NLC during the month of February-2013 is furnished at Annexure – 11D.

ii. All constituents were requested that details of shut down actually availed during the last month against the shutdown approved also should be furnished on monthly basis to SRPC.

11.5 OCC approved shutdown (forthcoming) a) Generating stations, Transmission lines and ICTs

i. It was noted that the number of planned outages in respect of generators and transmission elements were in more number. Hence the outages were to be prudently studied and decided. In view of this , it had been decided that OCC meeting would be held for two days – first day for approving the outages of Generating stations and Transmission elements proposed by the utilities while second day would be for discussing other operational issues.

ii. The shutdown of ISTS elements approved in the OCC meeting is furnished in Annexure – 11E.

iii. In the earlier OCC meetings it had been recommended that the planned shutdowns of 400 kV transmission elements of State Sector also needed to be approved through OCC. Accordingly in the Meeting, KPTCL, APTRANSCO, and TANTRANSCO submitted their outage proposals transmission system elements for the approval of OCC forum. Details are at Annexure – 11F.

iv. SRLDC had expressed concern over the delay at times in returning shutdown, in some cases to the tune of 3 to 4 hours after the scheduled time. In this regard, SRLDC advised CTU & other constituents to complete the planned work within the allotted time. period and return the shutdowns as specified in the shutdown approval. Extension in the outage was leading to associated curtailment of power especially in the evening peak hours. PGCIL replied that any delay was extremely rare and was due to unavoidable problems.

v. No outage of elements without OCC approval unless otherwise

required for emergency nature of works.


vi. At times, utilities who are requesting shut down on emergency basis

were not availing the shut down due to non-availability of Men & Material. Hence all utilities were requested to keep Men & Material in place before requesting for any emergency shutdown.

vii. Delayed return of shutdown beyond permitted time schedule was to be

avoided. Rescheduling of approved shut downs was to be avoided.

viii. KPTCL had suggested that maintenance/project people could

assemble at the site before getting SRLDC code and the works commenced immediately upon receiving the code in order to avoid delays.

ix. MS i/c reiterated that utilities needed to submit their respective outage

proposals by 25th of every month (before OCC meeting) for effective planning etc.

12 Progress of Generation schemes & ATS

11.1 Progress of generation schemes scheduled to be commissioned during 2012-13 was reviewed. The updated information as furnished by the constituents is furnished at Annexure – 12A.

12.2 SRLDC presented the list of important generating schemes, transmission lines and generation evacuation lines under construction are at Annexure – 12B.

13 Compliance of IEGC guidelines/information needs to be furnished/ pending implementations

13.1 Automatic Demand Management Schemes

a) 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.

b) It was noted that Andhra Pradesh, Kerala, Tamil Nadu and Puducherry had implemented the scheme.

c) KPTCL had informed that all ESCOMS had taken following measures for implementation of Automatic Demand Management scheme.

i. Provided rostering of 11 kV rural feeders & it will be operated during peak hours for controlling the agricultural demand.


ii. Replacing conventional incandescent bulbs by CFL bulbs provided by BESCOM at concessional rates to consumers and it is in vague.

iii. As per directives of KERC, ESCOMs are implementing the scheme of providing TOD meters to EHT & HT consumers and differential tariffs are imposed to control the demand during the peak hours. At present CESC & MESCOM have already implemented.

iv. All the distribution companies are implementing the NIRANTRA JYOTHI Scheme for bifurcating the agricultural loads of 11 kV rural feeders.

d) It was suggested that constituents could identify other Demand Management Schemes other than Automatic Load Shedding Schemes.

e) In the Meeting, it was noted that though scheme for tripping loads were

available it was not automatic. SRLDC insisted for effective action plan from

states towards achieving automatic load management. MS i/c stressed that in

addition to action plan, relief figures submitted to Hon’ble CERC had to show

improvement over the previous figures.



It was noted that SRLDC had approached Hon'ble CERC with Petition (No. 250/MP/2012) on maintaining security of the inter connected power system of India in terms of Regulation 5.2 of the Central Electricity Regulatory Commission (Indian Electricity Grid Code) and compliance of Regulations 5.4.2 and 6.4.8. of the Grid Code. Hon'ble CERC had issued an order dated 14th January 2013 in respect of this petition. Para 10 of the order is reproduced below:

Quote "Accordingly we direct that the Regional Power Committees of all regions shall discuss the issue of implementation of the Automatic Demand Management Scheme at the SLDC/distribution company level" as an agenda item within one month from the date of issue of this order and file their decisions on affidavit within one week there after serving the copies thereof on all the constituents of the respective RPC. Since the Automatic Demand Management Schemes required to be implemented by SLDCs through their respective State Electricity Board/Distribution Licensees in accordance with Regulation 5.4.2(d) of the Grid Code, we direct all Distribution Latencies would also participate in the respective RPC meeting and their views should be taken into consideration. We also direct the SLDCs to provide all necessary data and assistance to NLDC and respective RLDCs for


effective implementation of the Automatic Demand management Scheme." Unquote

Accordingly in the Special TCC meeting held on 11th and 12th of February 2013, the issue was deliberated and the views of constituents and recommendations were finalized.

13.2 Automatic Load Disconnection Schemes for overdrawing constituents

a) 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

b) APTRANSCO, KSEB, TNEB and Puducherry had implemented the scheme for remote tripping from SLDC.

c) KPTCL had informed that 350 MW of load relief through remote tripping of loads during crisis period had been implemented and operationalized from SLDC

d) It was noted that the Automatic Load Disconnection Scheme was part of Automatic Demand Management Scheme.

e) In the meeting, SRLDC stressed that the low level of defense mechanism in SR was a matter of concern. The expected relief was not forthcoming. States therefore had been requested to identify feeders such that the desired quantum of relief as agreed would be ensured.

13.3 Arranging of interruptible loads in four groups

a) In the 80th OCC Meeting MS i/c informed that this issue had been deliberated in the Special TCC meeting held on 11th and 12th of February 2013. The views of constituents are reproduced here from the Minutes of the above said meeting:

i. APTRANSCO had stated that the interruptible loads needed to be provided for R & C measures, UFR & df/dt operation, SPS schemes and also for islanding schemes etc. At present, acute shortage conditions were prevailing in the region and the distribution companies were resorting to R & C measures. These R & C measures which included load shedding applied equally to the entire


state. Hence there was no possibility of getting interruptible loads in four groups without any overlap.

ii. TANTRANSCO had stated that in practice, overlapping was inevitable since there was also a limitation on the number of available 110 kV feeders.

iii. SRLDC had suggested that city feeders could be covered under the third stage of UFR operation. TANTRANSCO clarified that covering city feeders in the UFR scheme was a policy matter which may even require Government approval.

iv. KSEB had stated that issues such as reliability index etc were involved and the same loads could not visible in the SCADA system. Further, since distributed generation was also connected in a number of feeders, interruption of such feeders could result in loss of generation also which was not desirable. Hence, it would be prudent to go 11 kV levels for tripping of feeders so as to make scheme more effective.

b) In the earlier OCC meetings it was noted that 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 were to be grouped in such a manner that there was no overlapping between different groups of loads.

13.4 Restricted Governor Mode of Operation (RGMO)

a) SRLDC presented the RGMO Analysis Summary (details in Annexure–13A).

b) • Generators were requested to immediately analyze the information which were attached with OCC agenda w.r.t. RGMO and if any discrepancies were noted, should revert back with needful information and come prepared in next meeting.

• TANTRANSCO informed that new Mettur and NCTPS units were equipped with RGMO features

• NTECL informed that, Vallur Unit I(500 MW), after rectifying EHTC hunting problem, had been kept under trial RGMO operation from 11th March 2013 and it was monitoring the response .

c) i. It was noted that in the recent TCC/SRPC Meetings it was also noted that the performance of RGMO in the region was minimal.

ii. There was inadequate response from thermal generating units and the details were presented by SRLDC.


iii. SRLDC had requested confirmation from all the major generating units that the RGMO setting has been revised as per the requirement of IEGC (Amendments) Regulation. It also requested the constituents to ensure RGMO performance through Manual control of FGMO wherever RGMO setting is not possible.

iv. Cooperation of the generators had been sought to check the response and initiate remedial measures.

v. It was emphasized that Restricted Governor Mode of Operation of all eligible machines shall be ensured in place as one Remedial Measure to be pursued to contain High Frequency excursion.

13.5 On Line Demand Estimation

In the earlier OCC meetings, it was noted that all the states were furnishing the 15

Minute requirements. The constituents were apprised that the forecasting tool

should take into account weather inputs as well.

13.6 Notified Power Cuts

Member Secretary i/c SRPC requested that details of Notified power cuts and load

shedding be segregated and informed to SRPC Secretariat/CEA in a timely

manner through written communication to appraise MoP/GoI appropriately.

13.7 Drawl Extremes and Physical Regulation Measures

a) The issues had been deliberated in the previous OCC meetings. The constituents had expressed concern about imposing physical regulations without proper intimation and explained how badly it affected their system. It was stated that SRLDC was not allowing over drawal of more than 150 MW even when frequency was above 50 Hz. They had requested that over drawal at higher frequency could be permitted as stipulated in IEGC without endangering the security of Grid. Else the frequency could rise further higher, thus endangering the system.

b) SRLDC had quoted the clauses as per the IEGC and UI regulations and

informed that overdrawal could be allowed only within the limits as stipulated in the same. In case the over drawal quantum was higher, it would take more time to reduce their drawal in case of contingencies which would only drag the system to insecure operating conditions. They had also highlighted that system protection schemes like AUFR, df/dt, SPS were not acting to the desired level. Load Forecasting Day wise Block wise needed to be carried out for better system operation.Deviation from the injection / drawal schedule shall be strictly restricted to within the limit specified by the relevant CERC


Regulations. Even while the frequency is above 49.8 Hz, the over drawal quantum shall be such that it will not endanger the Line loading or lead to violation of IEGC / UI regulations in case of any contingency in the system. Constituents were also requested to maintain their Load Generation Balance in order to maintain SIL of Lines.

c) After deliberations, it had been agreed that SRLDC would review these

incidents. It was felt prudent that proper written intimation be given before imposing physical regulation measures. However, the SRLDC’s endeavor for safe and secure system operation was appreciated by the Forum. SRLDC was however requested that any intervention including load disconnection through implementation of physical regulation measures at ISTS drawal point of states be carried out subsequent to issuance of violation messages and non-compliance observed, if any.

d) Physical regulations imposed by SRLDC on different grid elements during February-2013 is NIL.

13.8 Load shedding details & web based PSP system utility

It had been noted in the earlier OCC Meetings, that the hourly load shedding

details should be furnished online by the State SLDCs before 3 ‘O’ clock in

respect of the previous day through web. SRLDC had also requested the

constituents to furnish other details through the web based PSP system utility

of SRLDC. For any assistance / clarifications, the OS department of SRLDC

could be approached.

13.9 ATC / TTC computations

SRLDC had pointed out that ATC / TTC computations were to be furnished

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

by all the constituents before 5th of every month for the purpose of ATC

computations.

13.10 Tripping details

a) The status of pending information for the month of February-2013 is enclosed as Annexure–13B. SRLDC informed that in accordance with the IEGC Regulations, tripping details are to be submitted within 24-hour time period. Non -submission of the same could be reckoned as grid code violation.


b) SRLDC again requested the constituents to submit the DL/EL details within 24 hours of tripping in accordance with the grid code. They added that they would be compelled to approach Hon’ble CERC in this regard in case there was no perceptible improvement soon.

13.11 Frequent Tripping of HVDC Bhadravathi

Deliberations:

In the meeting, SRLDC brought to the attention of the OCC forum that when the

filter banks were out of service due to some reason and HVDC poles were unable

to transfer full quantum of power, the poles were considered available. SRLDC

wanted to know in such instances how the certification was being given for pole

availability when it was not transferring full power in the subject case. It was also

revealed that such instances were happening once or twice a month and the data

regarding filter tripping etc were not received by SRLDC.



It was noted that the oscillations study report was awaited. It was also noted that in the Report submitted by the Enquiry Committee to look into the grid disturbance in NEW GRID, it was suggested that an audit of devices such as HVDC should be done to ensure that their stability features are enabled.


It was noted that SRLDC vide letter dated 28th August 2012 had stressed the requirement for oscillation damping features in all the HVDC installations to be kept in service.


It was noted that General Manager (O&M), WRTS - I vide letter dated 10th

August 2012 had requested GM, SRLDC/WRLDC to schedule the power transfer through HVDC Bhadravathi below 800 MW. Analyzing the power transfer through HVDC Bhadravathi Link(from West to South) during the New Grid Disturbances which had occurred on 30th and 31st July, it was opined that HVDC link could provide good relief during emergency if enough power margin was left to meet emergency requirement. It was pointed out that when SR frequency had dipped to 48.82 Hz, the frequency controller of HVDC Bhadravathi had acted and enhanced the power transfer from 830 MW to 1097 MW. (West to South).


14 Review of Performance of ULDC Scheme

14.1 Status of pending field inputs

a) In the Meeting, SRLDC presented the status of data, voice and internet communications and the same is furnished in Annexure –14A.

b) SRLDC also informed about the status of pending field inputs (Annexure–14B).

c) Deliberations:

i. KPTCL informed that 10 field inputs of Jindal were pending and it was

noted that the data was intermittent and not stable.

ii. The letter received from Chief Engineer (Transmission), NPCIL

furnishing current status of SCADA inputs of KGS( I-IV) and MAPS (I-II) is at (Annexure–14C).

14.2 Earlier Deliberations:


SRLDC informed that it may file an Interlocutory Application (IA) in respect of Petition No.178/MP/2011 regarding establishment and maintenance of Communication facilities by users of SR in terms of Clause 4.6.2. of IEGC,2010, read with Clause 5(3) of CEA (Technical Standards for connectivity to the Grid) Regulations, 2007 to ensure availability of reliable real time data at SRLDC. SRLDC therefore requested that if any of the points had already been completed or any new points newly added (other than as furnished in Annexure 14 B), the same may please be informed to SRLDC immediately.


i. It was noted that in regard to pending field inputs Kaiga had brought down the pending inputs to 12.

ii. It was informed by KPTCL that though data from Jindal was being received it was not consistent.

iii. SRLDC informed that SCADA data validation with constituent systems would be carried out in Janauray-2013.

• In the 78th OCC Meeting, the following was noted:

i. It was noted that there was no data being received from Jindal at SRLDC. KPTCL said that due to RTU problem it could not be sent and assured the OCC forum that effort had been taken to fix the problem and replacing the RTU. SRLDC stated that voice hot line facility to NTECL Vallur similar to NTPC Simhadri should be made available. It


was also noted that there was no stand by data channel at NTECL Vallur.

ii. It was noted that Kayathar 110 kV substation had been equipped with synchronizing facility

• In the 77th OCC Meeting it had been noted by NTPC that they are yet to receive any response from ERTS II. ER ULDC needed to make necessary modifications in the existing RTU.

• In the 76th OCC meeting, with regard to pending field inputs in respect of NTPC Talcher, it was noted that a Meeting in this regard with participation from NTPC, POWERGRID, SRLDC and SRPC had been held on 17.09.2012 at Talcher. It was also noted that in the recent TCC/SRPC Meetings SRLDC had intimated that as per recent orders of Hon’ble CERC in respect of Petition No. 178/MP/2011, all users were required to submit information by 31st October regarding the action plan for establishment of communication system for existing system, time schedule etc. NLDC was to submit a report by 10th November 2012 about the status of implementation of telemetry system.

15 Commercial

15.1 Monthly Time drift report receipt status (Annexure – 15A)

15.2 Weekly SEM data receipt status

a) SRLDC informed about the details of delay in receipt of Weekly SEM data during February- 2013 which is furnished at Annexure – 15B.

b) In the earlier Meeting, the following had been noted:

i. SRLDC presented instances of frequent under recording of SEMs during bus shut down and stressed the need to avoid such instances in future.

ii. It was informed that the SEM time drift was 18 minutes (i.e. more than a time block) in a few cases. As the time drift would make computations erratic and data validation difficult, constituents were requested to validate SEM timings with respect to GPS timing initiate necessary action.

15.3 Energy Charges

Energy charges of ISGS for the month of February-2013 as billed are atAnnexure-15C.


16 Miscellaneous

a) Data for Annual Report: 2012-2013

SRPC requested the constituents to prepare and send data for Annual Report

2012-2013.It was also informed that a letter would be sent in this regard to obtain

the data.

b) Customer Feedback form for SRLDC

SRLDC requested the constituents to fill up the Customer Feedback Form which

was available on their website and could be submitted on line.

C) Others:

a) TANTRANSCO informed that the new unit of North Chennai TPS had generated about 604 MW..

b) With respect to 400 KV Udumalpet – Arasur line, PGCIL informed that suspension tower porcelain insulators had been replaced by polymer insulators during February-2013 and insulators on tension towers were replaced by polymer insulators during end of February 2013 and first week of March 2013. PGCIL added that on 6th March 2013, NLC – Bahoor line tripped and the work of replacing porcelain insulators by polymer insulators had started on 6th March, 2013. SR II requested for deemed availability for these outages.

c) SR II also informed that Bidadi ICT(500 MVA, 400/230 KV) was expected to be commissioned by March 2013.

d) SRLDC expressed concern that tripping of Vallur – Almathy line at 19.31 hours was not reported either by NTECL, or PGCIL or TANTRANSCO and it was informed only around 21.30 hours. It was told by NTECL that due to the communication gap, resulting from PLCC card malfunctioning, reporting could not be done. NTECL said that personnel had been advised to report any tripping immediately to SRLDC. TNEB informed that they would revert back after looking into the incident. SR II responded that the incident was not reported to CPCC either by Vallur Station(JV between TN & NTPC) or by Almathy(owned by TNEB)..

e) It was told by PGCIL that based on the ambient temperature etc, the extended mode operation of HVDC Talcher – Kolar link would be decided.


17 Vote of Thanks

Member Secretary i/c, SRPC thanked all the Members for their active participation in the

Meeting.

18 Date & Venue of the Next OCC Meeting

The schedule for the next Meeting of OCC is as follows:

Meeting : 82nd OCC of SRPC

Date/Time : 10.04.2013 (Wednesday) at 10.00 hours Venue : Conference Hall, SRPC Bangalore

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Documents

SOUTHERN REGIONAL POWER COMMITTEE, BANGALORE · Valur (42.3%) had achieved less than the normative availability. He stated that NLC TS-I Expn despite being a lignite based plant could