YEAR:2010/WEEK No : 12 PERIOD FROM 22.03.2010 TO 28.03.2010

(A) FREQUENCY PROFILE:

MAX MIN Average

HZ HZ HZ

22-Mar-10 50.04 48.94 49.39 4.09

23-Mar-10 49.99 48.57 49.25 6.02

24-Mar-10 49.85 48.63 49.19 6.83

25-Mar-10 49.84 48.59 49.22 6.49

26-Mar-10 50.34 48.58 49.33 4.92

27-Mar-10 50.15 48.64 49.44 3.54

28-Mar-10 50.06 48.89 49.44 3.46

MAX 50.34 48.94 49.44 6.83

MIN 49.84 48.57 49.19 3.46

AVG 50.04 48.69 49.32 5.05

(B) VOLTAGE PROFILE:

MAX MIN MAX MIN MAX MIN

KV KV KV KV KV KV

22-Mar-10 403 391 406 378 411 391

23-Mar-10 404 394 405 383 413 395

24-Mar-10 403 393 404 382 412 394

25-Mar-10 399 388 405 379 413 391

26-Mar-10 399 388 405 370 412 377

27-Mar-10 401 386 405 369 411 380

28-Mar-10 406 392 405 387 412 395

MAX 406 394 409 392 413 395

MIN 399 386 404 369 411 377

AVG 402 390 405 378 412 389

MAX MIN MAX MIN MAX MIN

KV KV KV KV KV KV

22-Mar-10 411 398 404 367 425 408

23-Mar-10 412 400 398 364 424 400

24-Mar-10 410 398 399 365 423 396

25-Mar-10 408 395 396 371 424 397

26-Mar-10 408 392 394 359 423 399

27-Mar-10 411 391 395 360 429 404

28-Mar-10 410 400 400 382 424 406

MAX 412 400 404 382 429 408

MIN 408 391 394 359 423 396

AVG 410 396 398 367 425 401

Variation

Index

HYDERABAD BANGALORE

DATE

KOLAR

GOOTY MADRAS

POWER GRID CORPORATION OF INDIA LIMITED

S.R.L.D.C, BANGALORE

DATE

WEEKLY REPORT

DATE

TRIVANDRUM

FREQUENCY

WEEKLY REPORT 12/2010 (FROM 22.03.10 TO 28.03.10)

(C) MAJOR GENERATING UNITS OUTAGE DETAILS:

REASON FOR OUTAGE

TIME DATE TIME DATE

1 VIJAYAWADA TPS UNIT 6 210 MW APGENCO 15:22 23-Dec-09 OUT H/T FOR ANNUAL MAINTENANCE

2 NEYVELI TS I EXP UNIT 2 210 MW NLC 11:55 26-Feb-10 OUT TRIPPED DUE TO TURBINE VIBRATION HIGH

3 NORTH CHENNAI TPS UNIT 2 210 MW TNEB 10:23 12-Mar-10 OUT H/T DUE TO LP TURBINE VIBRATION PROBLEM

4 TUTUCORIN TPS UNIT 4 210 MW TNEB 23:53 22-Mar-10 RUNNING 17:58 23-Mar-10 H/T DUE TO BOILER TUBE LEAKAGE

5 RAICHUR TPS UNIT 2 210 MW KPCL 15:57 23-Mar-10 RUNNING 21:10 23-Mar-10 H/T DUE TO COAL SHORTAGE

6 NEYVELI II UNIT 4 210 MW NLC 3:28 24-Mar-10 RUNNING 0:29 27-Mar-10 H/T DUE TO CLINKER FORMATION

7 NEYVELI II UNIT 2 210 MW NLC 3:02 26-Mar-10 OUT H/T DUE TO ECONOMISER PUNCTURE

8 RAICHUR TPS UNIT 6 210 MW KPCL 1:55 27-Mar-10 RUNNING 5:46 27-Mar-10 TRIPPED DUE TO CONDENSER PRESSURE LOW

9 NORTH CHENNAI TPS UNIT 1 210 MW TNEB 6:51 27-Mar-10 RUNNING 11:43 27-Mar-10 H/T DUE TO BOILER TUBE LEAKAGE

10 VIJAYAWADA TPS UNIT 7 500 MW APGENCO 22:05 27-Mar-10 OUT H/T DUE TO ECONOMISER PUNCTURE

11 METTUR TPS UNIT 1 210 MW TNEB 4:55 28-Mar-10 OUT H/T DUE TO ECONOMISER PUNCTURE

(D) OUTAGES OF MAJOR TRANSMISSION LINES AND ICT'S:

TIME DATE TIME DATE

1 220 kV GUMMUDIPUNDI - SULLURPET AP/TN 8:27 5-Feb-10 OUT TRIPPED DUE TO OVER LOAD.

2 400 KV VEMAGIRI - GAZUWAKA 1 POWERGRID 8:49 16-Mar-10 REVIVED 9:32 22-Mar-10 H/ TO CONTROL OVER LOADING OF VIJ - NLR LINES

3 400 kV KALPAKKA - VEMAGIRI 1 APTRANSCO 8:55 16-Mar-10 REVIVED 10:37 22-Mar-10 H/T TO CONTAIN O/L OF VIJ-NEL LINES

4 220 kV GOOTY - ALIPUR LINE AP/KPTCL 9:20 22-Mar-10 REVIVED 18:15 22-Mar-10 L/C BY APTRANSCO FOR MAINTENANCE WORKS

5 400 KV GOOTY-RAICHUR 1 POWERGRID 11:12 22-Mar-10 REVIVED 11;26 22-Mar-10 TRIPPED DUE TO PLCC MAL-OPERATION AT RAICHUR END

6 400 kV JEYPORE - GAZUWAKA 2 POWERGRID 12:16 22-Mar-10 REVIVED 6:37 23-Mar-10 H/T TO CONTROL ER SIDE VOLTAGE

7 400/220 kV ICT-1 AT N'SAGAR POWERGRID 15:00 22-Mar-10 REVIVED 18:33 22-Mar-10 H/T AS PER APTRANSCO REQUEST FOR OVER HAULING OF 220 KV BUS-I ISOLATOR.

8 400 kV TALAGUPPA - NEELAMANGALA 2 KPTCL 23:10 22-Mar-10 REVIVED 18:36 23-Mar-10 H/T TO REGULATE FLOW ON 220 KV LINES

9 400/230 kV ICT-1 AT UDUMALPET POWERGRID 5:36 23-Mar-10 OUT TRIPPED ON DIFERENTIAL PROTECTION..DECAPTIALISED

10 400 kV NEYVELI - MADRAS POWERGRID 8:01 23-Mar-10 REVIVED 11:18 23-Mar-10 H/T FOR L/C FOR CONNECTING E/W ON 400 KV LILO LINE OF PONDY S/S TO EXISTING NLY-MDS LINE

11 220 kV IDUKKI - UDUMALPET KSEB/TN 8:19 23-Mar-10 REVIVED 17:55 26-Mar-10 L/C BY KSEB FOR MAINTENANCE WORKS

12 220 kV GOOTY - ALIPUR LINE AP/KPTCL 8:20 23-Mar-10 REVIVED 17:55 23-Mar-10 L/C BY APTRANSCO FOR MAINTENANCE WORKS

13 400 kV JEYPORE - GAZUWAKA 1 POWERGRID 11:06 23-Mar-10 REVIVED 18:45 24-Mar-10 H/T TO CONTROL LOADING OF VJA-NLR LINES.

14 400 Kv RAMAGUNDAM - WARANGAL POWERGRID 14:23 23-Mar-10 REVIVED 14:54 23-Mar-10 TRIPPED ON Y-N TRANSIENT FAULT.

15 220 kV KOLAR - CHINTAMANI 1 KPTCL 16:22 23-Mar-10 REVIVED 17:17 23-Mar-10 H/T FOR PHYSICAL REGULATORY MEASURES AS PER KPTCL.

16 220 kV KOLAR - CHINTHAMANI 2 KPTCL 16:22 23-Mar-10 REVIVED 17:17 23-Mar-10 H/T FOR PHYSICAL REGULATORY MEASURES AS PER KPTCL.

REASON FOR OUTAGESL.NO CONSTITUENT

OUTAGE

OUTAGE CURRENT

STATUS

REVIVAL TIME

CURRENT

STATUS

REVIVAL TIME

SL No. CONSTITUENTSTATION UNIT No. CAPACITY (MW)

WEEKLY REPORT 12/2010 (FROM 22.03.10 TO 28.03.10)

17 400/220 kV ICT-2 AT N'SAGAR POWERGRID 16:59 23-Mar-10 REVIVED 0:31 24-Mar-10 H/T AS PER APTRANSCO REQUEST FOR REPAIR WORKS OF 220 KV BUS-II ISOLATOR.

18 400 kV TALAGUPPA - NEELAMANGALA 2 KPTCL 23:10 23-Mar-10 REVIVED 18:35 24-Mar-10 H/T TO REGULATE POWERFLOW ON 220KV NLM-TLG LINES

19 SALEM INTER-CONNECTORS 1 & 2 TNEB 14:57 24-Mar-10 REVIVED 15:53 24-Mar-10 H/T FOR PHYSICAL REGULATION DUE TO PERSISTENT O/D BY TNEB

20 SALEM INTER-CONNECTORS 1 & 2 TNEB 0:51 25-Mar-10 REVIVED 6:12 25-Mar-10 H/T FOR PHYSICAL REGULATION DUE TO PERSISTENT O/D BY TNEB

21 230kV HOSUR-SOOLAGIRI TNEB 5:58 25-Mar-10 REVIVED 6:13 25-Mar-10 H/T FOR PHYSICAL REGULATION DUE TO PERSISTENT O/D BY TNEB

22 400 kV RAMAGUNDAM - N'SAGAR 1 POWERGRID 7:02 25-Mar-10 REVIVED 16:42 25-Mar-10 H/T FOR L/C BY POWERGRID FOR REPLACEMENT OF GAPPED SURGE ARRESTER WITH GAPLESS SURGE ARRESTER AND AMP WORKS

23 SALEM INTER-CONNECTORS 1 & 2 TNEB 20:15 25-Mar-10 REVIVED 6:04 26-Mar-10 H/T FOR PHYSICAL REGULATION DUE TO PERSISTENT O/D BY TNEB

24 230kV HOSUR-SOOLAGIRI TNEB 5:25 26-Mar-10 REVIVED 6:05 26-Mar-10 H/T FOR PHYSICAL REGULATION DUE TO PERSISTENT O/D BY TNEB

25 400 kV RAMAGUNDAM - HYDERABAD 2 POWERGRID 7:09 26-Mar-10 REVIVED 19:08 28-Mar-10 H/T FOR LC BY APTRANSCO LILO WORKS AT MLKRM (LINE CHARGED AS HYD-MLKRM-R

26 400/220 kV ICT-3 AT N'SAGAR POWERGRID 9:49 26-Mar-10 REVIVED 17:04 26-Mar-10 H/T AS PER APTRANSCO REQUEST FOR MAINTENANCE WORKS OF 220 KV BUS-III ISOL

27 400 Kv NEYVELI TS-II- TRICHY POWERGRID 8:56 27-Mar-10 REVIVED 16:41 27-Mar-10 H/T FOR LC BY NLC FOR ROUTINE MAINTAINANCE WORKS

28 400/220 kV ICT-1 AT KALPAKA APTRANSCO 9:20 27-Mar-10 REVIVED 17:37 27-Mar-10 H/T FOR LC FOR RELAY TESTING WORKS

29 400 kV NEELAMANGALA - MYSORE 1 POWERGRID 21:56 27-Mar-10 REVIVED 21:56 27-Mar-10 SUCESSFULLY AUTORECLOSED ON B-N TRANSIENT FUALT

30 400 Kv TRIVENDRUM-THIRUNELVELI 1 POWERGRID 6:31 28-Mar-10 REVIVED 21:41 28-Mar-10 H/T FOR LC FOR CONSTRUCTION OF TNLV - EDAMON EAST COCHIN LINE

31 400 KV TRIVENDRUM - TIRUNELVELI 2 POWERGRID 6:33 28-Mar-10 REVIVED H/T FOR LC FOR CONSTRUCTION OF TNLV - EDAMON EAST COCHIN LINE

32 400 Kv CUDDAPPA - CHITTOOR POWERGRID 7:41 28-Mar-10 REVIVED 19:50 28-Mar-10 H/T FOR LC FOR LA REPLACEMENT AND E/W STRINGING AND OTHER MAINTENANCE W

33 400 kV KHAMMAM - MAMIDIPALLY 2 APTRANSCO 10:10 28-Mar-10 REVIVED 15:16 28-Mar-10 H/T FOR LC FOR PRE MONSOON INSPECTION

34 400/220 Kv ICT-2 AT MUNIRABAD POWERGRID 16:40 28-Mar-10 REVIVED 17:36 28-Mar-10 H/T TO ATTEND OIL LEAKAGE FROM 33KV SIDE MANHOLE

(E) TRANSMISSION CONSTRAINTS : NIL

(F) GRID DISTURBANCES : NIL

(G) INSTANCES OF SIGNIFICANT NON COMPLIANCE OF IEGC : NO OF 'B' & 'C' MESSAGES ISSUED DURING THE WEEK

APTRANSCO KPTCL KSEB TNEB PONDY

B MESSAGES 0 0 0 105 0

C MESSAGES 0 0 0 38 0

(H) REGULATORY MEASURES : ON 24.03.10 AT 14:57 HRS SALEM INTERCONNECTOR - I & 2 WAS TAKEN OUT AND CLOSED AT 15:53 DUE TO PERSISTENT O/D BY TNEB

ON 25.03.10 AT 00:51 HRS SALEM INTERCONNECTOR - I & 2 WAS TAKEN OUT AND CLOSED AT 06:12 DUE TO PERSISTENT O/D BY TNEB

ON 25.03.10 AT 05:58 HRS TO 06:13 HRS HOSUR - SOOLAGIRI LINE WAS TAKEN OUT DUE TO PERSISTENT O/D BY TNEB

ON 25.03.10 AT 20:15 HRS TO 06:04 HRS (26-03-10) SALEM INTERCONNECTOR - I & 2 WAS TAKEN OUT DUE TO PERSISTENT O/D BY TNEB

ON 26.03.10 AT 05:25 HRS TO 06:05 HRS HOSUR - SOOLAGIRI LINE WAS TAKEN OUT DUE TO PERSISTENT O/D BY TNEB

AS PER IEGC CLAUSE 6.4.7

AS PER IEGC CLAUSE 6.4.12