UI SUMMARY BOTTLENECKSIN SR GRID

RECENT GRID DISTURBANCES

MERITORDER

OCC PRESENTATION

FGMOKAR

DISTURBANCE

REDUCING THE LOSSES IN GRID

BUYING AND SELLING UI RATES

BUYING AND SELLING RATES BUYING AND SELLING RATES FOR UIFOR UI

UI – NECESSARY FOR OVERALL ECONOMY (MERIT UI – NECESSARY FOR OVERALL ECONOMY (MERIT ORDER)ORDER)

UI NEEDS CONSTRAINTLESS TRANSMISSIONUI NEEDS CONSTRAINTLESS TRANSMISSION TRANSMISSION IS CROSS-SUBSIDISING UITRANSMISSION IS CROSS-SUBSIDISING UI UI USES TRANSMISSION AND CAUSES LOSSESUI USES TRANSMISSION AND CAUSES LOSSES BILATERALS CAN BE HEDGED USING UI AND CfDBILATERALS CAN BE HEDGED USING UI AND CfD …………………………THE SOLUTION SHOULD KEEP THE THE SOLUTION SHOULD KEEP THE

SIMPLICITY OF UI, EASY TO IMPLEMENT … YET SIMPLICITY OF UI, EASY TO IMPLEMENT … YET TAKE CARE OF LOSSES AND TR.CHARGESTAKE CARE OF LOSSES AND TR.CHARGES

BUYING AND SELLING RATES BUYING AND SELLING RATES FOR UIFOR UI

INCREMENTAL LOSSES 2*AVG LOSSES ≈ INCREMENTAL LOSSES 2*AVG LOSSES ≈ 2*3.5% ≈ 7%2*3.5% ≈ 7%

DIFF BETWEEN BUYING AND SELLING UI ≈ DIFF BETWEEN BUYING AND SELLING UI ≈ 30pS/UNIT30pS/UNIT

UI TURNOVER IN SR ≈ 5000 MU WOULD UI TURNOVER IN SR ≈ 5000 MU WOULD COST ≈ 150 CRORES IN UI RESIDUALCOST ≈ 150 CRORES IN UI RESIDUAL

THIS CAN BE SHARED BY TRANSMISSION THIS CAN BE SHARED BY TRANSMISSION STAKEHOLDERSSTAKEHOLDERS

WOULD GIVE SIGNAL FOR WOULD GIVE SIGNAL FOR TR.AUGMENTATION TR.AUGMENTATION

REDUCING THE REDUCING THE LOSSES IN THE GRIDLOSSES IN THE GRID

REDUCING THE LOSSES IN THE GRIDREDUCING THE LOSSES IN THE GRID LOSSES REDUCED BY 1-1.5 % THROUGHOUT THE GRIDLOSSES REDUCED BY 1-1.5 % THROUGHOUT THE GRID OPTIMISATION AND CO-ORDINATION OF GT AND ICT TAPSOPTIMISATION AND CO-ORDINATION OF GT AND ICT TAPS

– CORRECTIVE ACTION BASED ON CORRECTIVE ACTION BASED ON WEEKLY SEM READINGSWEEKLY SEM READINGS PTI (OFF-LINE)PTI (OFF-LINE) ONLINE EMS STUDIESONLINE EMS STUDIES

THREE HVDC SET POINT OPTIMISATIONTHREE HVDC SET POINT OPTIMISATION REDUCE THE NO. OF LINE OPENINGSREDUCE THE NO. OF LINE OPENINGS

– OPENING LINES IMPACTS LOSSESOPENING LINES IMPACTS LOSSES– SWITCHING OFF SHUNT CAPACITORSSWITCHING OFF SHUNT CAPACITORS

SR HAS 7580 MVAR HT CAPACITORSSR HAS 7580 MVAR HT CAPACITORS– GENERATORS ON SYNCH CONDENSOR MODEGENERATORS ON SYNCH CONDENSOR MODE

EXAMPLE.. IF SHARAVATHY COMPLEX GENERATORS ARE PUT ON EXAMPLE.. IF SHARAVATHY COMPLEX GENERATORS ARE PUT ON CONDENSOR MODE – TALGUPPA VOLTAGE CAN BE CONTROLLED CONDENSOR MODE – TALGUPPA VOLTAGE CAN BE CONTROLLED BETTERBETTER

– BUS REACTOR SWITCHINGBUS REACTOR SWITCHING HARNESS GENERATORS CAPABILITYHARNESS GENERATORS CAPABILITY FIELD ASSESSMENT OF GENERATOR CAPABILITYFIELD ASSESSMENT OF GENERATOR CAPABILITY MOST DORMANT INTER-STATE LINES CLOSEDMOST DORMANT INTER-STATE LINES CLOSED BETTER VOLTAGE PROFILEBETTER VOLTAGE PROFILE

MAXIMUM & MINIMUM DRAWALAUG-04

240 257

2164 2297

860 934

1329 1432

1284 1389

ENTITLEMENT

WITH TAL WITH TAL

1500MW 2000MW

140 10

980 - 100

220 20

-140 - 140

- 1070 - 1070

MIN DRAWALAUG 04 TILL NOW

185

1650

500

1100

510

AVG DRAWAL

1460 1890AP

2380 2730TN

830 1040KER

225 235PONDY

1900 2130KAR

MAX DRAWALAUG 04 TILL NOW

STATE

APR-04

APR-04

APR-04 APR-04

MAR-04

FEB-04

AUG-04

OCT-03

DEC-03

AUG-04

BOTTLENECKS IN TRANSMISSIONBOTTLENECKS IN TRANSMISSION KAIGA COMPLEX EVACUATION STILL A PROBLEMKAIGA COMPLEX EVACUATION STILL A PROBLEM KARNATAKA COASTAL GENERATORS NOT KARNATAKA COASTAL GENERATORS NOT

FIRMLY ANCHOREDFIRMLY ANCHORED N.COASTAL AP – EVACUATION OF GAS N.COASTAL AP – EVACUATION OF GAS

STATIONSSTATIONS GMR VASAVI EVACUATION – STILL ON 110KVGMR VASAVI EVACUATION – STILL ON 110KV SRISAILAM SYSTEM – UNDER UTILISATIONSRISAILAM SYSTEM – UNDER UTILISATION SINGLE ICTs AT NUNNA, GAZUWAKA, SINGLE ICTs AT NUNNA, GAZUWAKA,

CUDDAPAH, GOOTY ETC.CUDDAPAH, GOOTY ETC. EXPEDITING 400 KV STATION AT MYSORE, EXPEDITING 400 KV STATION AT MYSORE,

CHITOORCHITOOR EXPEDITING ICT AT NELLOREEXPEDITING ICT AT NELLORE

VARIABLE COSTCURVE

UI DETAILSUI DETAILS

APAP KARKAR KERKER TNTN PONDYPONDY

Total UI Total UI exported(-) / exported(-) / Imported(+) Imported(+)

in MUsin MUs

-2889-2889 24352435 976976 958958 -25-25

Total amount Total amount paid in paid in

Crores Rs.Crores Rs.-533-533 428428 167167 227227 1.61.6

Average rate Average rate of UI in of UI in

paise/unitpaise/unit191191 176176 171171 237237 6666

SUMMARY OF UISUMMARY OF UI(FROM 01/JAN/03 TO 29/AUG/04)(FROM 01/JAN/03 TO 29/AUG/04)

INTER REGIONAL UI IN SRINTER REGIONAL UI IN SR (FROM 01/01/03 TO 29/08/04) (FROM 01/01/03 TO 29/08/04)

TOTAL UI TURNOVER :- 5143 MUTOTAL UI TURNOVER :- 5143 MU TOTAL UI AMOUNT DISBURSED:- 980 CRTOTAL UI AMOUNT DISBURSED:- 980 CR INTER REGIONAL UI:- +1014 MU (-)191 MUINTER REGIONAL UI:- +1014 MU (-)191 MU AVG WEEKLY TRANSACTION:- 59 MUAVG WEEKLY TRANSACTION:- 59 MU AVG WEEKLY UI AMT DISBURSED:- 11 CRAVG WEEKLY UI AMT DISBURSED:- 11 CR AVG RATE OF UI WITH WR IN PS/UAVG RATE OF UI WITH WR IN PS/U

– 155 PS/U155 PS/U @SR @SR– 250 PS/U250 PS/U @WR @WR

AVG RATE OF UI IMPORT FROM ER IN PS/UAVG RATE OF UI IMPORT FROM ER IN PS/U– 144 PS/U 144 PS/U @ ER @ ER

INTER-REGIONAL EXCHANGES A/C DETAILS TILL 29/08/04INTER-REGIONAL EXCHANGES A/C DETAILS TILL 29/08/04

1. SR IMPORTED 334 MU AND EXPORTED 181 MU TO WR.

2. AMOUNT ACCRUED IN SREB – IRE DUE TO DIFF. IN WR A/C = 38.2Crs

3. AMOUNT ACCRUED IN WREB – IRE DUE TO DIFF. IN SR A/C = 23.3Crs

4. AMOUNT DUE TO SR CONSTITUENTS ON 50:50 BASIS = 30.75Crs

5. 100 % DISBURSEMENT

IMPACT OF LINE OPENING ON SR SYSTEM LOSSIMPACT OF LINE OPENING ON SR SYSTEM LOSS

On 3On 3rdrd /4 /4thth August all the above lines were opened to August all the above lines were opened to control over voltage.control over voltage.

The increase in loss would be around 71 MWThe increase in loss would be around 71 MW

LINE NAMELINE NAME INCREASE IN LOSS (MW)INCREASE IN LOSS (MW)

VIJAYAWADA-SRISAILAM IVIJAYAWADA-SRISAILAM I 44

VIJAYAWADA-NELLORE IIVIJAYAWADA-NELLORE II 1010

N’SAGAR-CUDAPPA IIN’SAGAR-CUDAPPA II 99

NELLUR-MADRAS IINELLUR-MADRAS II 99

KOLAR-HOODY IIKOLAR-HOODY II 55

KHAMMAM-MAMIDIPALLI IIKHAMMAM-MAMIDIPALLI II 77

KOLAR-HOSUR IKOLAR-HOSUR I 88

NEYVELI-SALEM IINEYVELI-SALEM II 66

TRICHY-MADURAI IITRICHY-MADURAI II 77

SOUTHERN REGION LOSSSOUTHERN REGION LOSS**

•*Source : Report of System Studies conducted for Accessing Shunt Compensation requirement in Southern Region – March 2004 and March 2005 -by SREB ,CEA in co-ordination with the constituents

•** Projected figures

YEARYEAR LOAD LOAD (MW)(MW)

LOSS LOSS (MW)(MW)

% %

LOSSLOSS

20022002 1912319123 979979 5.125.12

20032003 2039120391 842842 4.134.13

2004**2004** 2283022830 823823 3.603.60

2005**2005** 2315323153 744744 3.213.21

GENERATORS ON SYNCH GENERATORS ON SYNCH CONDENSOR MODE: ADVANTAGESCONDENSOR MODE: ADVANTAGES

IMPROVED SHORT CIRCUIT LEVELSIMPROVED SHORT CIRCUIT LEVELS CAN BE CONVERTED TO GENERATOR CAN BE CONVERTED TO GENERATOR

MODE IN SHORT NOTICEMODE IN SHORT NOTICE EXCELLENT REACTIVE SOURCEEXCELLENT REACTIVE SOURCE REDUCED LOSSESREDUCED LOSSES CONTROL VOLTAGE FLUCTUATIONSCONTROL VOLTAGE FLUCTUATIONS

IDUKKI UNIT 1 RUNNING IN CONDENSER MODE ON 27-MAR-03

-60

-40

-20

0

20

40

60

80

100

120

140

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00

TIME IN HR ---->

MW

/MV

AR

->

MW

MVAR

3 QUADRANT OPERATION3 QUADRANT OPERATION

SYNCHRONOUS CONDENSOR SYNCHRONOUS CONDENSOR OPERATION: IN OPERATIONOPERATION: IN OPERATION

S. NoS. No Name of the Name of the GeneratorGenerator Unit NoUnit No Installed capacity Installed capacity

(In MW)(In MW) RemarksRemarks

11 N'SagarN'Sagar 22 100100 RunningRunning

22 N'SagarN'Sagar 33 100100 RunningRunning

33 N'SagarN'Sagar 44 100100 RunningRunning

44 N'SagarN'Sagar 55 100100 RunningRunning

55 N'SagarN'Sagar 66 100100 RunningRunning

66 N'SagarN'Sagar 77 100100 RunningRunning

77 SriSailam LBPHSriSailam LBPH 11 150150 TestedTested

88 SriSailam LBPHSriSailam LBPH 22 150150 TestedTested

99 SriSailam LBPHSriSailam LBPH 33 150150 TestedTested

1010 SriSailam LBPHSriSailam LBPH 44 150150 TestedTested

1111 SriSailam LBPHSriSailam LBPH 55 150150 TestedTested

1212 IddukkiIddukki 11 130130 RunningRunning

1313 IddukkiIddukki 22 130130 RunningRunning

1414 IddukkiIddukki 33 130130 RunningRunning

SYNCHRONOUS CONDENSOR SYNCHRONOUS CONDENSOR OPERATION: POSSIBLE ATOPERATION: POSSIBLE AT

10PEPPARA33SPELTONSL.NSL.NO.O. POWER STATIONPOWER STATION

INSTALLED CAPACITYINSTALLED CAPACITY

TYPE OF TYPE OF SCHEMESCHEME

TYPE OF TYPE OF TURBINE TURBINE

11 SHARAVATHISHARAVATHI 10x103.510x103.5 10351035 SS V.PELTONV.PELTON

22 JOGJOG 4x18+4x124x18+4x12 120120 SS V.PELTONV.PELTON

33 VARAHIVARAHI 2x1152x115 230230 SS V.PELTONV.PELTON

44 KUTTIADIKUTTIADI 3x253x25 7575 SS PELTONPELTON

55KUTTIADI KUTTIADI

EXTENTIONEXTENTION 1x501x50 5050    PELTONPELTON

66 PALLIVASALPALLIVASAL 3x7.5+3x43x7.5+3x4 37.537.5 SS PELTONPELTON

77 SENGULAMSENGULAM 4x124x12 4848 RR PELTONPELTON

88 SABARIGIRISABARIGIRI 6x506x50 300300 SS PELTONPELTON

99 IDUKKIIDUKKI 3x130+3x1303x130+3x130 780780 SS PELTONPELTON

DISTURBANCE AT NTPC RAMAGUNDAM ON DISTURBANCE AT NTPC RAMAGUNDAM ON 26/08/0426/08/04

DURING TESTING OF GENERATOR NEUTRAL END Y –DURING TESTING OF GENERATOR NEUTRAL END Y –PH CT, THE LBB RELAYS OF UNIT 7 MAIN AND TIE PH CT, THE LBB RELAYS OF UNIT 7 MAIN AND TIE C.B ACTED RESULTING IN BUSBAR TRIPPINGC.B ACTED RESULTING IN BUSBAR TRIPPING

ALL UNITS ON BAR (UNIT 1,2,3,6) AT NTPC ALL UNITS ON BAR (UNIT 1,2,3,6) AT NTPC TRIPPED.TRIPPED.

THE FEEDERS REMAIN INTER-CONNECTED THE FEEDERS REMAIN INTER-CONNECTED THROUGH TIE BREAKER THROUGH TIE BREAKER

THE TIE BREAKEER FOR AUTO 5 AND GHANAPUR THE TIE BREAKEER FOR AUTO 5 AND GHANAPUR CKT3 WAS NOT AVAILABLE , SO THE CKT3 WAS NOT AVAILABLE , SO THE INTERCONNECTION WAS LOSTINTERCONNECTION WAS LOST

AUTO4 AND GHANAPUR CKT4 TRIPPED ON BACK UP AUTO4 AND GHANAPUR CKT4 TRIPPED ON BACK UP O/C PROETECTIONO/C PROETECTION

CHANDRAPUR I & II TIE REMAINED CONNECTED CHANDRAPUR I & II TIE REMAINED CONNECTED WITHOUT POWER FLOWWITHOUT POWER FLOW

N’SAGAR-1

N’SAGAR-2

GHANAPUR-1

GHANAPUR-2 ICT-1 ICT-2 ICT-3 GHANPUR-4

250 MW57 MW 95 MW

BUS DEAD

BREAKER OPEN

ICT-4

BREAKER NOT IN SERVICE

GHANPUR-3

ICT-5

BUS DEAD

140 MW

RESTORATION AT RESTORATION AT RAMAGUNDAMRAMAGUNDAM

DEVICE CLOSED TIME DATE DEVICE CLOSED TIME DATE ICT 4 20:59 26/08/04ICT 4 20:59 26/08/04 N’Sagar 2 22:00 26/08/04N’Sagar 2 22:00 26/08/04 Chandrapur1 22:36 26/08/04 (Charged)Chandrapur1 22:36 26/08/04 (Charged) Chandrapur2 22:37 26/08/04 (Charged)Chandrapur2 22:37 26/08/04 (Charged) ICT 5 22:51 26/08/04ICT 5 22:51 26/08/04 Ghanapur2 23:11 26/11/04Ghanapur2 23:11 26/11/04 Unit 1 23:45 26/08/04Unit 1 23:45 26/08/04 Unit2 00:23 27/08/04Unit2 00:23 27/08/04 Unit3 09:55 27/08/04Unit3 09:55 27/08/04 Unit6 01:05 27/08/04Unit6 01:05 27/08/04

LINES UNDER SHUT DOWNLINES UNDER SHUT DOWN1.AMBEWADI-PONDA II2.LINGAPUR-GADAG3.HUBLI-LINGAPUR4.HUBLI-NARENDRA II5.SHARAVATHI-TALAGUPPA6.HUBLI-TALAGUPPA7.SHARAVATHI-SHIMOGA II8.GUTTUR-RANIBENNUR

DISTURBANCE IN KARNATAKA ON DISTURBANCE IN KARNATAKA ON 02/09/0402/09/04

DISTURBANCE IN KARNATAKA ON 02/09/04DISTURBANCE IN KARNATAKA ON 02/09/04

PRE-DISTURBANCE CONDITIONPRE-DISTURBANCE CONDITION– IN KARNATAKA SYSTEM 8 NOS OF 220 KV LINES IN KARNATAKA SYSTEM 8 NOS OF 220 KV LINES

WERE UNDER SHUTDOWN WERE UNDER SHUTDOWN – SHARAVATHI NAGJHERI,KAIGA,VARAHI,KADRA SHARAVATHI NAGJHERI,KAIGA,VARAHI,KADRA

AND KODASHALLI WAS CONNECTED TO THE AND KODASHALLI WAS CONNECTED TO THE REST OF THE SYSTEM VIA KAIGA-GUTTUR D/C REST OF THE SYSTEM VIA KAIGA-GUTTUR D/C AND SHARAVATHI –SHIMOGA LINES AND SHARAVATHI –SHIMOGA LINES

AT 14:15 HRS THE CT ON SHARAVATHI –SHIMOGA AT 14:15 HRS THE CT ON SHARAVATHI –SHIMOGA 4TH CIRCUIT EXPLODED. BOTH BUSES AT 4TH CIRCUIT EXPLODED. BOTH BUSES AT SHIMOGA BECAME DEAD. SHIMOGA BECAME DEAD.

VARAHI AND MANGALORE ALSO BECAME DEAD VARAHI AND MANGALORE ALSO BECAME DEAD BECAUSE OF LOAD – GENERATION MISMATCH.BECAUSE OF LOAD – GENERATION MISMATCH.

DISTURBANCE IN KARNATAKA ON 02/09/04DISTURBANCE IN KARNATAKA ON 02/09/04

THE ENTIRE POWER FROM HYDRO AND KAIGA THE ENTIRE POWER FROM HYDRO AND KAIGA WAS BEING EVACUATED THROUGH KAIGA-WAS BEING EVACUATED THROUGH KAIGA-GUTTUR D/C .GUTTUR D/C .

SUBSEQUENTLY LINES KAIGA-GUTTUR D/C AND SUBSEQUENTLY LINES KAIGA-GUTTUR D/C AND GUTTUR ICT TRIPPED. THIS CAUSED AN ISLAND GUTTUR ICT TRIPPED. THIS CAUSED AN ISLAND OF SHARAVATHI,NAGHJERI,KAIGA WITH AROUND OF SHARAVATHI,NAGHJERI,KAIGA WITH AROUND 500 MW LOAD. IN BLOCK SHARAVATHI,NAGHJERI 500 MW LOAD. IN BLOCK SHARAVATHI,NAGHJERI BLOCK FREQUENCY WENT UPTO 50.8 HZBLOCK FREQUENCY WENT UPTO 50.8 HZ

KAIGA UNITS WENT ON HOUSE LOAD . KAIGA KAIGA UNITS WENT ON HOUSE LOAD . KAIGA UNIT 1 SURVIVED AND WAS INTEGRATED WITH UNIT 1 SURVIVED AND WAS INTEGRATED WITH NAGJHERI BLOCK AT 15:33 HRS. KAIGA UNIT2 NAGJHERI BLOCK AT 15:33 HRS. KAIGA UNIT2 GOT POISONED OUT.GOT POISONED OUT.

RESTORATIONRESTORATION GENARTION AT NAGJHERI WAS REDUCED AND 2 GENARTION AT NAGJHERI WAS REDUCED AND 2

UNITS OF SHARAVATHI WERE SYNCHRONIZED.UNITS OF SHARAVATHI WERE SYNCHRONIZED. GUTTUR-RANIBENNUR WAS CLOSED AND LOADS GUTTUR-RANIBENNUR WAS CLOSED AND LOADS

OF GUTTUR WERE TAKEN UP RADIALLY.THE OF GUTTUR WERE TAKEN UP RADIALLY.THE GENERATION OF THIS BLOCK WAS STABLE AT 650 GENERATION OF THIS BLOCK WAS STABLE AT 650 MW.MW.

SUPPLY WAS EXTENDED TO KAIGA BY CLOSING SUPPLY WAS EXTENDED TO KAIGA BY CLOSING ONE CIRCUIT OF KAIGA-GUTTUR LINE.ONE CIRCUIT OF KAIGA-GUTTUR LINE.

SHIMOGA BUS WAS ENERGIZED FROM PEENYA SHIMOGA BUS WAS ENERGIZED FROM PEENYA AND THE ISLAND WAS SYNCHRONIZED WITH AND THE ISLAND WAS SYNCHRONIZED WITH REST OF THE GRID BY SYNCHRONIZING 220 KV REST OF THE GRID BY SYNCHRONIZING 220 KV SHARAVATHI-SHIMOGA CKT 1 AT 16:12 SHARAVATHI-SHIMOGA CKT 1 AT 16:12 HRS .SUBSEQUENTLY SHARAVATH-SHIMOGA 3 HRS .SUBSEQUENTLY SHARAVATH-SHIMOGA 3 WAS CLOSED.WAS CLOSED.