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UI SUMMARY

REDUCING THE LOSSES IN GRID. BUYING AND SELLING UI RATES. UI SUMMARY. BOTTLENECKS IN SR GRID. RECENT GRID DISTURBANCES. MERIT ORDER. OCC PRESENTATION. FGMO KAR DISTURBANCE. BUYING AND SELLING RATES FOR UI. UI – NECESSARY FOR OVERALL ECONOMY (MERIT ORDER)

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UI SUMMARY

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  1. REDUCING THE LOSSES IN GRID BUYING AND SELLING UI RATES UI SUMMARY BOTTLENECKS IN SR GRID RECENT GRID DISTURBANCES MERIT ORDER OCC PRESENTATION FGMO KAR DISTURBANCE

  2. BUYING AND SELLING RATES FOR UI • UI – NECESSARY FOR OVERALL ECONOMY (MERIT ORDER) • UI NEEDS CONSTRAINTLESS TRANSMISSION • TRANSMISSION IS CROSS-SUBSIDISING UI • UI USES TRANSMISSION AND CAUSES LOSSES • BILATERALS CAN BE HEDGED USING UI AND CfD • ……………THE SOLUTION SHOULD KEEP THE SIMPLICITY OF UI, EASY TO IMPLEMENT … YET TAKE CARE OF LOSSES AND TR.CHARGES

  3. BUYING AND SELLING RATES FOR UI • INCREMENTAL LOSSES 2*AVG LOSSES ≈ 2*3.5% ≈ 7% • DIFF BETWEEN BUYING AND SELLING UI ≈ 30pS/UNIT • UI TURNOVER IN SR ≈ 5000 MU WOULD COST ≈ 150 CRORES IN UI RESIDUAL • THIS CAN BE SHARED BY TRANSMISSION STAKEHOLDERS • WOULD GIVE SIGNAL FOR TR.AUGMENTATION

  4. REDUCING THE LOSSES IN THE GRID

  5. REDUCING THE LOSSES IN THE GRID • LOSSES REDUCED BY 1-1.5 % THROUGHOUT THE GRID • OPTIMISATION AND CO-ORDINATION OF GT AND ICT TAPS • CORRECTIVE ACTION BASED ON • WEEKLY SEM READINGS • PTI (OFF-LINE) • ONLINE EMS STUDIES • THREE HVDC SET POINT OPTIMISATION • REDUCE THE NO. OF LINE OPENINGS • OPENING LINES IMPACTS LOSSES • SWITCHING OFF SHUNT CAPACITORS • SR HAS 7580 MVAR HT CAPACITORS • GENERATORS ON SYNCH CONDENSOR MODE • EXAMPLE.. IF SHARAVATHY COMPLEX GENERATORS ARE PUT ON CONDENSOR MODE – TALGUPPA VOLTAGE CAN BE CONTROLLED BETTER • BUS REACTOR SWITCHING • HARNESS GENERATORS CAPABILITY • FIELD ASSESSMENT OF GENERATOR CAPABILITY • MOST DORMANT INTER-STATE LINES CLOSED • BETTER VOLTAGE PROFILE

  6. STATE AVG DRAWAL MAX DRAWAL AUG 04TILL NOW ENTITLEMENT WITH TAL WITH TAL 1500MW 2000MW MIN DRAWAL AUG 04TILL NOW AP 510 1460 1890 1284 1389 - 1070 - 1070 MAR-04 AUG-04 KAR 1100 1900 2130 1329 1432 -140 - 140 AUG-04 FEB-04 KER 500 830 1040 860 934 220 20 DEC-03 APR-04 TN 1650 2380 2730 2164 2297 980 - 100 APR-04 OCT-03 PONDY 185 225 235 240 257 140 10 APR-04 APR-04 MAXIMUM & MINIMUM DRAWAL AUG-04

  7. BOTTLENECKS IN TRANSMISSION • KAIGA COMPLEX EVACUATION STILL A PROBLEM • KARNATAKA COASTAL GENERATORS NOT FIRMLY ANCHORED • N.COASTAL AP – EVACUATION OF GAS STATIONS • GMR VASAVI EVACUATION – STILL ON 110KV • SRISAILAM SYSTEM – UNDER UTILISATION • SINGLE ICTs AT NUNNA, GAZUWAKA, CUDDAPAH, GOOTY ETC. • EXPEDITING 400 KV STATION AT MYSORE, CHITOOR • EXPEDITING ICT AT NELLORE

  8. VARIABLE COST CURVE

  9. UI DETAILS

  10. SUMMARY OF UI(FROM 01/JAN/03 TO 29/AUG/04) IRE NEXT

  11. INTER REGIONAL UI IN SR (FROM 01/01/03 TO 29/08/04) • TOTAL UI TURNOVER :- 5143 MU • TOTAL UI AMOUNT DISBURSED:- 980 CR • INTER REGIONAL UI:- +1014 MU (-)191 MU • AVG WEEKLY TRANSACTION:- 59 MU • AVG WEEKLY UI AMT DISBURSED:- 11 CR • AVG RATE OF UI WITH WR IN PS/U • 155 PS/U @SR • 250 PS/U @WR • AVG RATE OF UI IMPORT FROM ER IN PS/U • 144 PS/U @ ER MORE-IRE NEXT

  12. INTER-REGIONAL EXCHANGES A/C DETAILS TILL 29/08/04 • SR IMPORTED 334 MU AND EXPORTED 181 MU TO WR. • AMOUNT ACCRUED IN SREB – IRE DUE TO DIFF. IN WR A/C = 38.2Crs • AMOUNT ACCRUED IN WREB – IRE DUE TO DIFF. IN SR A/C = 23.3Crs • AMOUNT DUE TO SR CONSTITUENTS ON 50:50 BASIS = 30.75Crs • 100 % DISBURSEMENT

  13. IMPACT OF LINE OPENING ON SR SYSTEM LOSS • On 3rd /4th August all the above lines were opened to control over voltage. • The increase in loss would be around 71 MW

  14. SOUTHERN 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 KPTCL

  15. GENERATORS ON SYNCH CONDENSOR MODE: ADVANTAGES • IMPROVED SHORT CIRCUIT LEVELS • CAN BE CONVERTED TO GENERATOR MODE IN SHORT NOTICE • EXCELLENT REACTIVE SOURCE • REDUCED LOSSES • CONTROL VOLTAGE FLUCTUATIONS NEXT: IDUKKI 3 QUADRANT OPN

  16. 3 QUADRANT OPERATION MW MVAR NEXT: GENERATORS ON SYNCH CONDENSOR

  17. SYNCHRONOUS CONDENSOR OPERATION: IN OPERATION

  18. SYNCHRONOUS CONDENSOR OPERATION: POSSIBLE AT PEPPARA PELTON 10 S 3 3

  19. DISTURBANCE AT NTPC RAMAGUNDAM ON 26/08/04 • DURING TESTING OF GENERATOR NEUTRAL END Y –PH CT, THE LBB RELAYS OF UNIT 7 MAIN AND TIE C.B ACTED RESULTING IN BUSBAR TRIPPING • ALL UNITS ON BAR (UNIT 1,2,3,6) AT NTPC TRIPPED. • THE FEEDERS REMAIN INTER-CONNECTED THROUGH TIE BREAKER • THE TIE BREAKEER FOR AUTO 5 AND GHANAPUR CKT3 WAS NOT AVAILABLE , SO THE INTERCONNECTION WAS LOST • AUTO4 AND GHANAPUR CKT4 TRIPPED ON BACK UP O/C PROETECTION • CHANDRAPUR I & II TIE REMAINED CONNECTED WITHOUT POWER FLOW NTPC LAYOUT NEXT

  20. GHANPUR-3 N’SAGAR-1 GHANAPUR-1 ICT-5 ICT-1 ICT-4 GHANPUR-4 ICT-3 N’SAGAR-2 GHANAPUR-2 ICT-2 140 MW 250 MW 95 MW 57 MW BUS DEAD BUS DEAD BREAKER OPEN BREAKER NOT IN SERVICE RESTORATION IS NEXT

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

  22. DISTURBANCE IN KARNATAKA ON 02/09/04 • LINES UNDER SHUT DOWN • AMBEWADI-PONDA II • LINGAPUR-GADAG • HUBLI-LINGAPUR • HUBLI-NARENDRA II • SHARAVATHI-TALAGUPPA • HUBLI-TALAGUPPA • SHARAVATHI-SHIMOGA II • GUTTUR-RANIBENNUR

  23. DISTURBANCE IN KARNATAKA ON 02/09/04 • PRE-DISTURBANCE CONDITION • IN KARNATAKA SYSTEM 8 NOS OF 220 KV LINES WERE UNDER SHUTDOWN • SHARAVATHI NAGJHERI,KAIGA,VARAHI,KADRA AND KODASHALLI WAS CONNECTED TO THE REST OF THE SYSTEM VIA KAIGA-GUTTUR D/C AND SHARAVATHI –SHIMOGA LINES • AT 14:15 HRS THE CT ON SHARAVATHI –SHIMOGA 4TH CIRCUIT EXPLODED. BOTH BUSES AT SHIMOGA BECAME DEAD. • VARAHI AND MANGALORE ALSO BECAME DEAD BECAUSE OF LOAD – GENERATION MISMATCH. KARNATKA DISTURBANCE NEXT

  24. DISTURBANCE IN KARNATAKA ON 02/09/04 • THE ENTIRE POWER FROM HYDRO AND KAIGA WAS BEING EVACUATED THROUGH KAIGA-GUTTUR D/C . • SUBSEQUENTLY LINES KAIGA-GUTTUR D/C AND GUTTUR ICT TRIPPED. THIS CAUSED AN ISLAND OF SHARAVATHI,NAGHJERI,KAIGA WITH AROUND 500 MW LOAD. IN BLOCK SHARAVATHI,NAGHJERI BLOCK FREQUENCY WENT UPTO 50.8 HZ • KAIGA UNITS WENT ON HOUSE LOAD . KAIGA UNIT 1 SURVIVED AND WAS INTEGRATED WITH NAGJHERI BLOCK AT 15:33 HRS. KAIGA UNIT2 GOT POISONED OUT. RESTORATION NEXT

  25. RESTORATION • GENARTION AT NAGJHERI WAS REDUCED AND 2 UNITS OF SHARAVATHI WERE SYNCHRONIZED. • GUTTUR-RANIBENNUR WAS CLOSED AND LOADS OF GUTTUR WERE TAKEN UP RADIALLY.THE GENERATION OF THIS BLOCK WAS STABLE AT 650 MW. • SUPPLY WAS EXTENDED TO KAIGA BY CLOSING ONE CIRCUIT OF KAIGA-GUTTUR LINE. • SHIMOGA BUS WAS ENERGIZED FROM PEENYA AND THE ISLAND WAS SYNCHRONIZED WITH REST OF THE GRID BY SYNCHRONIZING 220 KV SHARAVATHI-SHIMOGA CKT 1 AT 16:12 HRS .SUBSEQUENTLY SHARAVATH-SHIMOGA 3 WAS CLOSED.

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