POWER GRID CORPORATION OF INDIA LTD

POWER GRID CORPORATION OF INDIA LTD
GRID EVENTS AND ISSUES in 139TH SREB MEETING 19TH DECEMBER 2005 HYDERABAD SOUTHERN REGIONAL LOAD DESPATCH CENTRE POWER GRID CORPORATION OF INDIA LTD

HIGH VOLTAGE OPERATION
139th SREB – DEC – 05. FREQ DURATION CURVE LOAD DURATION CURVE SEP-05,OCT 05, NOV-05 VOLTAGE PROFILE SEP -05 OCT -05 NOV -05 DEMAND INDICES TALCHER - KOLAR SCH Vs DRWL EVENTS HYDRO GENERATION COMP MAX, MIN & AVG STATE DRAWAL RESERVOIR POSITION HIGH VOLTAGE OPERATION 01-02 NOV 05 HIGH FREQ OPERATION FGMO (FREQ 48.54Hz) 28-NOV-05 FGMO SUMMARY KAIGA TRIPPING 07-NOV-05 FREQUENCY PENALTY SCHEME FORMATION OF RPC TALCHER – KOLAR INTER TRIP GEN. TRIPPING AT KAIGA & KODASALLI ADV. USING CHIKKODI - KOLHAPUR EVACUATION OF NEW GENERATION

Next NOV-05 NOV-04 In HZ <49 <49.5 49-50.5 >50.0 >50.5
Avg Freq Nov-05 0.12 1.58 98.24 78.60 1.64 50.11 Nov-04 0.33 8.04 99.63 17.76 0.04 49.80 NOV-05 NOV-04 Next

OCT-05 NOV-05 NOV-04 In HZ <49 <49.5 49-50.5 >50.0 >50.5
Avg Freq Nov-05 0.12 1.58 98.24 78.60 1.64 50.11 Nov-04 0.33 8.04 99.63 17.76 0.04 49.80 Oct-05 0.00 0.03 97.47 96.04 2.53 50.22 OCT-05 NOV-05 NOV-04

LOAD DURATION CURVE OF SOUTHERN REGION FOR SEP 2005 & SEP 2004
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LOAD DURATION CURVE OF SOUTHERN REGION FOR OCT 2005 & OCT 2004
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LOAD DURATION CURVE OF SOUTHERN REGION FOR NOV 2005 & NOV 2004

TALCHER-KOLAR IMPORT OF 23850MUs FROM ER THROUGH TALCHER-KOLAR UPTO NOV - 05 YEAR ---> 2002 2003 2004 2005 MONTHS TOTAL ENERGY (IN MU) MAX FLOW (IN MW) JAN --- 311 850 805 1528 852 1583 FEB 273 1010 701 1508 775 1865 MAR 491 1316 837 1600 884 1507 APR 473 1183 923 1500 878 MAY 172 1026 652 1385 704 JUN 277 994 688 1416 691 1605 JUL 319 1075 759 1490 1254 1880 AUG 346 1088 628 1341 857 SEP 6 200 512 1533 742 1552 732 1881 OCT 58 500 508 1458 829 1550 895 1834 NOV 77 470 1048 719 999 DEC 241 750 630 1383 882 1615 TOTAL 382 4782 9165 9521 AVERAGE 96 399 764 866 MAX FLOW

DEMAND INDICES FOR NOVEMBER 2005
COMPARISON

DEMAND INDICES - COMPARISON
May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05 Nov-05 ANDHRA PRADESH LEAN/PEAK 0.80 0.75 0.73 0.71 0.64 AVG/PEAK 0.90 0.92 0.88 0.87 0.89 0.85 KARNATAKA 0.69 0.59 0.58 0.60 0.83 0.78 0.76 0.77 KERALA 0.53 0.51 0.52 0.54 0.70 0.66 0.65 0.67 TAMILNADU 0.79 0.74 0.68 0.61 0.86 SOUTHERN REGION 0.72 0.81

MAJOR EVENTS Continued…..
SOUTHERN REGION MET A DEMAND OF 21112MW IN SEPTEMBER (4% RISE OVER LAST YEAR) 33% RISE IN HYDRO STORAGE IN SR COMPARED TO LAST YEAR PER DAY SR HYDRO GENERATION TOUCHED MUS. MORE AND MORE STOA TRANSACTIONS SALE OF URP OF RSTPS U#7 TO PSEB COMMENCED FROM 21ST SEP 05 SOUTHERN REGION MET A DEMAND OF 21268MW IN OCTOBER (4.6% RISE OVER LAST YEAR) 37% RISE IN HYDRO STORAGE IN SR COMPARED TO LAST YEAR ON 17TH OCT KV N’SAGAR – RAICHUR LINE LILOED AT MAHABOOBNAGAR S/S OF APTRANSCO 400KV N’SAGAR-MAHABOOBNAGAR 400KV MAHABOOBNAGAR-RAICHUR 400/220KV , 1 x 315MVA ICT COMMISSIONED AT MAHABOOBNAGAR S/S OF APTRANSCO ON 18TH OCT 05 Continued…..

MAJOR EVENTS (Continued ….)
400/220KV , 315 MVA ICT SYNCHRONISED AT NARENDRA S/S OF POWERGRID ON 28TH OCT 05 400KV KAIGA-NARENDRA DC LINES SYNCHRONISED ON 28TH OCT 05 400KV KAIGA-NARENDRA DC LINES ALONGWITH 400/220KV, 1 x MVA ICT AT NARENDRA S/S COMMERCIAL OPERATION FROM 1ST NOV 05 SOUTHERN REGION MET A DEMAND OF 20,736MW IN NOV–05. (3% RISE OVER LAST YEAR) 38% RISE IN HYDRO STORAGE IN SR COMPARED TO LAST YEAR

MAXIMUM & MINIMUM DRAWAL IN MW
NOV-05 STATE AVG DRAWAL MAX DRAWAL NOV TILL NOW ENTITLEMENT MIN DRAWAL NOV 05 TILL NOW AP 950 1459 KAR 735 1417 KER 600 1148 TN 1500 2361 PONDY 160 304 JUN-05 AUG-04 NOV-05 MAY 05 SEP-05 APR-05 JUL 05 OCT-03 OCT-04 APR-04

IMPLEMENTED SCHEME TO ENSURE GRID STABILITY
BOTH POLES WERE HEALTHY AND ONE POLE GOES OUT INSTANT TRIPPING OF UNIT #6, (ONE OF THE FOUR STAGE-II UNITS) IF EX BUS GENERATION IS MORE THAN 1700MW BOTH POLES WERE HEALTHY AND BOTH POLES GO OUT IF EX BUS GENERATION IS MORE THAN 1100 MW UNITS #5 & #6 TRIPPED INSTANTANEOUSLY UNIT #4 TRIPPED AFTER 250 m sec IF EX BUS GENERATION IS MORE THAN 550 MW UNIT # 5 TRIPPED INSTANTANEOUSLY UNIT # 4 TRIPPED AFTER m sec UNIT # 6 TRIPPED AFTER m sec NOTE: STAGGERED TRIPPING IS ADOPTED TO ALLOW THE POWER SUMMATED SIGNAL RESETTING Continue ……

Continue ……

Inter Trip Scheme Continue ……

HIGH SPEED INTER-TRIP SCHEME AT KOLAR
TO TALCHER KURNOOL SOMYAZULA PALLI GOOTY CUDDAPAH KOLAR SOMANHALLI SPBDR HOODY HOSUR PONDICHERY SALEM BAHOOR NLC II NLC -1 EXP. TRICHUR TRICHY UDUMALPET MADURAI Continue ……

HIGH SPEED INTER-TRIP SCHEME AT KOLAR
MODE OF OPERATION POWER LEVEL FOR GENERATING INTERTRIP SIGNAL MONO POLAR >400 MW AND THE POLE TRIPS BI-POLAR IF BOTH POLE ARE CARRYING > 800 MW EACH AND ONE POLE TRIPS IF EACH POLE IS CARRYING POWER IN THE RANGE OF 400 TO 800 MW AND ONE POLE TRIPS AND AFTER THE DELAY OF 2 SECS THE POWER ON SURVIVING POLE IS LESS THAN 600MW IF POWER FLOW ON EACH POLE > 200 MW AND BOTH POLES TRIP WITH IN 2 SECS

KADAMPARAI GENERATION/PUMP ENERGY FROM JAN - 2003
2003 2004 2005 GENERATOR MODE PUMP MODE JAN 39 38 44 58 FEB 46 21 MAR 32 51 6 18 APR 35 40 26 3 MAY 37 43 41 48 30 JUN 29 45 55 JUL 47 49 50 79 62 AUG 54 25 SEP 36 15 OCT NOV 23 24 64 59 DEC 53 TOTAL 446 507 328 330 356 306

RESERVOIR LEVEL - COMPARISON
LEVEL IN MTS LEVEL 30-Nov-04 30-Nov-05 JALAPUT 836.14 837.58 LINGANMAKKI 548.56 553.04 SUPA 540.40 559.57 IDUKKI 722.87 729.50 KAKKI 972.35 979.60 NILGIRIS TOTAL ENERGY 30-Nov-04 30-Nov-05 RISE IN MU % RISE 438 501 63 14 2698 4106 1408 52 1781 2759 978 55 1407 1946 538 38 609 829 220 36 1459 1442 17 1 8393 11584 3190

KAIGA TRIPPING ON 07th NOV 05
AT 16:18HRS, HUBLI BUS BECAME DEAD DUE TO INSULATOR BURST AT HUBLI ON 220KV HUBLI-LINGAPUR. KPTCL DETAILS 2. 400KV KAIGA-GUTTUR WAS ALREADY OUT. NAGJHERI & KAIGA GENERATION WAS AROUND 800MW. CHIKKODI, BELGAUM, NARENDRA, AMBEWADI & GOA LOADS ARE AROUND MW. POWER RUSHED TO GUTTUR THROUGH 220KV KAIGA-GUTTUR LINE. AT 16:21HRS, 220KV KAIGA-GUTTUR LINE ALONG WITH KAIGA UNITS TRIPPED. KAIGA & NAGJHERI COMPLEX FREQUENCY SHOOT UP TO 52.6HZ. SUBSEQUENTLY ALL NAGJHERI WERE TRIPPED AT 16:33HRS. SCADA

AP KAR TN Next KER List ORISSA MAHARASHTRA
STATUS OF 400 KV LINES OF SR AS ON DATE 02-NOV-05 ORISSA TALCHER BHADRAVATI JEYPORE MAHARASHTRA AP SIMHADRI NTPC RSTPP KALPAKKA KHAMMAM P GAZUWAKA (POWERGRID) MMDP HYDERABAD P P P MAHABOOB NAGAR P NARENDRA N’SAGAR VIJAYAWADA KAR RAICHUR P KURNOOL MUNIRABAD SSLMM P KAIGA N SIRSI P GOOTY CUDDAPAH GUTTUR P NELLORE 1000 MW HVDC BACK TO BACK LINK HIRIYUR TALGUPPA NELAMANGALA 2000 MW HVDC BIPOLE BANGALORE P MADRAS KOLAR P HOODY HOSUR 500 KV HVDC LINE 400 KV LINE POWERGRID SALEM NEYVELI 400 KV LINE APTRANSCO TN UDUMALPET P TRICHY NEYVELI TPS – 1 (EXP) EXP 400 KV LINE KPTCL TRICHUR P 400 KV LINE OPERATED AT 220 KV MADURAI Next THERMAL GENERATING STATION KER List 400KV SUB-STATION THIRUVANANTHAPURAM

ADVANTAGES OF MADURAI-TRIVANDRUM LINE
ALTERNATE SUPPLY PATH TO TRIVANDRUM AREA INCREASED STABILITY OF S.KERALA SYSTEM DECREASED LOSSES IMPROVED TRANSFER MARGIN – FACILITATING BETTER MERIT ORDER OPERATION AND ECONOMY

THE ISSUES OF CONCERN Next HIGH VOLTAGE AT TRIVANDRUM
TRIPPING OF ICT ON V/F AT NIGHT RISK OF TRIPPING OF LINE CONTINUED HIGH LOADING ON 220 KV EDAMON-KAYATHAR PREVENTING FURTHER DECREASE IN GENERATION IN KSEB SYSTEM Next

ADVANTAGES OF COMMISSIONING 400 KV KAIGA NARENDRA D/C LINE
KOLHAPUR (MAHARASHTRA) ADVANTAGES OF COMMISSIONING 400 KV KAIGA NARENDRA D/C LINE CHIKKODI KARNATAKA M.L.PURA BELGAUM MAPUSA NARENDRA 220 PONDA (Goa) AMBEWADI XELDEM(GOA) HUBLI KODASALLI KADRA NAGJHARI GUTTUR KAIGA Next NOT TO SCALE DISTANCES EXAGERATED FOR CONVENIENCE

ADVANTAGES OF COMMISSIONING 400 KV KAIGA-NARENDRA D/C LINE
PROVIDES ALTERNATE PATH FOR EVACUATION OF KAIGA GENERATION IN CASE OF CONTINGENCY LINE IS ON DIFFERENT ROUTE FROM THAT OF KAIGA-GUTTUR ENHANCED REDUNDANCY AND RELIABILITY

Inter Regional Links Present IR Capacity = 9,500 MW 1650 MW 700 MW
2300 16,000 1200 MW 32,700 MW 1200MW Present IR Capacity = 9,500 MW 34,500 MW 2000MW

400 KV LINE PRESENTLY OPERATED AT 220 KV
GRID MAP TALCHER BHADRAVATI TYPICAL FLOWS ARE FROM NORTH TO SOUTH JEYPORE 178x2 2x221 SIMHADRI NTPC 8x4 RSTPP 400 KV LINE PRESENTLY OPERATED AT 220 KV 1 GAZUWAKA(AP) 189 301x2 15x2 187 P 195 267x2 VISAKHAPATNAM (POWERGRID) HYDERABAD KHAMMAM P 197x2 P 115 317 P MMDP 155 P 146x2 221x2 VIJAYAWADA RAICHUR 258 P NAGARJUNASAGAR Nagjhari KURNOOL 172 279 ABOUT CKM 400KV TRANSMISSION GRID FOCAL POINT SHIFTED TO KOLAR AFTER COMMISSIONING OF HVDC 308 MUNIRABAD SSLMM KODASAALY P 277 KAIGA 52x2 N SIRSI 120 P GOOTY 60 CUDDAPAH DAVANAGERE P 300 NELLORE KADRA 302 173 HIRIYUR 330 242 NELAMANGALA 28 BANGALORE ALMATHI HOODY P KOLAR MADRAS P TALGUPPA HOSUR MAPS 182 181 63 175 SALEM PONDICHERY P NEYVELI 54 179 151 164x2 UDUMALPET QUANTUM CHANGES IN FLOW PATTERN LIKELY AFTER COMMISSIONING OF KOODANKULAM 2000 MW P TRICHY 130x2 TRICHUR P P 127 130x2 P MADURAI PALLOM EDAMON THIRNELVALI KAYANKULAM 2x78 THIRUVANATHAPURAM KOODANKULAM

INTER REGIONAL LINKS TALCHER KOLAR HVDC LINE LENGTH:100 KMS TALCHER
ORISSA) KOLAR (KARNATAKA) HVDC STATION

TALCHER KOLAR SCHEMATIC
Electrode Station Electrode Station KOLAR +/- 500 KV DC line 1370 KM Kolar 400kv System 220kv system Hosur Hoody B’lore Chintamani Salem Madras Cudappah Udumalpet

SUMMARY OF UI – 153WKS (FROM 01/JAN/03 TO 04/DEC/05)
AP KAR KER TN PONDY Total UI exported(-) / Imported(+) in MUs -4688 4734 679 1702 -199 Total amount paid in Crores Rs. -899 862 117 448 -36 Average rate of UI in paise/unit 192 182 173 263 183

TOTAL UI AMOUNT DISBURSED:- 1933 CR AVG WEEKLY TRANSACTION:- 66 MU
UI IN SR (FROM 01/01/03 TO 04/12/05) TOTAL UI TURNOVER : MU TOTAL UI AMOUNT DISBURSED: CR AVG WEEKLY TRANSACTION:- 66 MU AVG WEEKLY UI AMOUNT DISBURSED:- 13 CR

INTER-REGIONAL EXCHANGES DETAILS UPTO 151 WKS (Till 20.11.05)
WR ER Net Energy Transaction 57.5 MU IMPORT BY SR 493.9MU Amount Due to SR Constituents Rs Cr. Rs Cr.* Amount Credited TO SR Constituents Rs Cr. Rs Cr. *from (when ER exchanges respective frequencies)

MW MVAR

STEPS TAKEN TO CONTAIN OVER VOLTAGE
TRANSFORMER TAP CHANGES MANY ICT TAPS WERE CHANGED ON 400/220 ICT’s GT TAP CHANGES GENERATORS ON SYNCH CONDENSOR MODE NETWORK MANIPULATION UPTO 40 LINES KEPT OUT TO CONTROL HV DURING LEAN SEASON EVEN DURING PEAK, SRISAILAM LINES ARE KEPT OPEN TO CONTROL HIGH VOLTAGE TAKING OUT THE LINE AND CONVERTING LINE REACTOR TO BUS REACTOR UTILISATION OF HYBRID AC/DC NETWORK DIVERSION OF TALCHER STAGE 2 POWER THROUGH GAJUWAKA

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

3 QUADRANT OPERATION MW MVAR

SYNCHRONOUS CONDENSOR OPERATION: IN OPERATION
S. No Name of the Generator Unit No Installed capacity (In MW) Remarks 1 N'Sagar 2 100 Running 3 4 5 6 7 SriSailam LBPH 150 Tested 8 9 10 11 12 Iddukki 130 13 14

SYNCHRONOUS CONDENSOR OPERATION: POSSIBLE AT
SL.NO. POWER STATION INSTALLED CAPACITY TYPE OF SCHEME TYPE OF TURBINE 1 SHARAVATHI 10x103.5 1035 S V.PELTON 2 JOG 4x18+4x12 120 3 VARAHI 2x115 230 4 KUTTIADI 3x25 75 PELTON 5 KUTTIADI EXTENTION 1x50 50 6 PALLIVASAL 3x7.5+3x4 37.5 7 SENGULAM 4x12 48 R 8 SABARIGIRI 6x50 300 9 IDUKKI 3x130+3x130 780 PEPPARA PELTON 10 S 3 3

SHORT TERM OPEN ACCESS TOTAL TRANSACTION APPROVED = 105
ENERGY TRANSACTED = 717 MUs SRLDC CHARGES COLLECTED = 19.2 LAKHS TRANSMISSION CHARGES COLLECTED = 10.2 CRS DATE :12th Oct 2004

LIST OF GENERATORS WITH PELTON TURBINE

LIST OF LINE REACTORS THAT CAN BE USED AS BUS REACTOR
Note : Matter taken up with SRTS I & II to confirm on voltage switching.

KOODANKULAM EVACUATION
400 KV D/C QUAD LINE TO TIRUNELVELI 2nd 400 KV D/C QUAD TO TIRUNELVELI ON SEPARATE ROUTE LILO OF 400 KV D/C TIRUNELVELI 400 KV D/C TIRUNELVELI-UDUMALPET LINE 400 KV D/C TIRUNELVELI-COCHIN-THRISSUR LINE 400 KV D/C TIRUNELVELI-EDAMON LINE 400 KV D/C TIRUNELVELI-COCHIN-THRISSUR LINE AND THE 400 KV D/C TIRUNELVELI-EDAMON LINE WOULD BE ON THE SAME MULTI-CIRCUIT TOWER USING ROW OF EXISTING 220 KV EDAMON-KAYATHAR LINE. 400 KV D/C TIRUNELVELI-EDAMON LINE TO BE CHARGED AT 220 KV INITIALLY. 400 KV D/C TIRUNELVELI-EDAMON LINE WOULD LATER BE EXTENDED TO TRIVANDRUM

MULTI-CIRCUIT TOWER ON 220 KV EDAMON-KAYATHAR CORRIDOR
NLMNG CHITOOR KOLAR HOODY ALMATHI HASSAN SP-BUDUR S’HALLI HOSUR MELKOTTAIYUR MYSORE BAHOOR KOZHIKODE SALEM NEYVELI ARASUR NLY-EXP PUGALUR JAYAMKONDAM THRISSUR UDUMALPET TRICHY KARAIKUDI COCHIN MADURAI MULTI-CIRCUIT TOWER ON 220 KV EDAMON-KAYATHAR CORRIDOR EDAMON KOODANKULAM TRANSMISSION SYSTEM AS APPROVED IN 17TH STANDING COMMITTEE MEETING HELD AT BANGALORE IN SEP03 TIRUNELVELI TRIVANDRUM KOODANKULAM

TALCHER-KOLAR IMPORT OF 23850MUs FROM ER THROUGH TALCHER-KOLAR UPTO NOV - 05 YEAR ---> 2002 2003 2004 2005 MONTHS TOTAL ENERGY (IN MU) MAX FLOW (IN MW) JAN --- 311 850 805 1528 852 1583 FEB 273 1010 701 1508 775 1865 MAR 491 1316 837 1600 884 1507 APR 473 1183 923 1500 878 MAY 172 1026 652 1385 704 JUN 277 994 688 1416 691 1605 JUL 319 1075 759 1490 1254 1880 AUG 346 1088 628 1341 857 SEP 6 200 512 1533 742 1552 732 1881 OCT 58 500 508 1458 829 1550 895 1834 NOV 77 470 1048 719 999 DEC 241 750 630 1383 882 1615 TOTAL 382 4782 9165 9521 AVERAGE 96 399 764 866 MAX FLOW

PRESENT KOLAR INTER TRIP LOGIC
COMMISSIONED ON CONDITIONS BEING CONSIDERED FOR TRIPPING OF 220 KV LINES ON TRIPPING OF TALCHER-KOLAR HVDC POLE(S) MONOPOLAR OPERATION: If the pole power one second prior to trip was more than 400 MW, we extend the inter-trip. BIPOLAR OPERATION: (2A) If both poles were carrying power in excess of 200 MW and both poles trip within a time span of 2 sec, we extend inter-trip. (2B) If both poles were carrying power in excess of 800 MW and any one of the poles trips, we extend inter-trip irrespective of power compensation by the surviving pole. (2C) If each pole was carrying power in the range of 400 MW to 800MW and one pole trips, no trip is extended if after a delay of 2 sec the power of surviving pole is more than 600 MW.

PRESENT INTER-TRIP POINTS
1) Chinakampally 5) Hosur 2) Kolar ICT 6) Sriperumbudur 3) Hoody 7) Salem 4) Somanahalli

SUGGESTED SCHEME: TRIP SIGNAL 1
Trip Signal 1 would be initiated under any one of the following two conditions: If loss of power flow on the HVDC link at any instant compared with the power flow 2 seconds prior to current instant is more than 500 MW but less than or equal to 1000 MW. If one of the HVDC pole block on a line fault and the power flow on the HVDC link just prior to that instant was more than 1000 MW but less than or equal to 1500 MW.

SUGGESTED SCHEME: TRIP SIGNAL 2
Trip Signal 2 would be initiated to obtain an additional relief of around 800 MW (in addition to 700 MW from Trip Signal 1) : If loss of power flow on the HVDC link at any instant compared with the power flow 2 seconds prior to current instant is more than 1000 MW. If one of the HVDC pole block on a line fault and the power flow on the HVDC link just prior to that instant was more than 1500 MW. Note: In the event of occurrence of Trip signal 2, the total relief would be of the order of around 1500 MW.

TRIP SIGNAL 1: POINTS STATE SUBSTATIONS RELIEF (MW) REMARKS A.P
CHINAKAMPALLI 150 EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND. KARNATAKA KOLAR ICT 250 THROUGH LOCAL PILOT WIRING HOODY THROUGH PLCC TAMIL NADU HOSUR 300 SRIPERUMBUDUR SALEM

TRIP SIGNAL 2: POINTS STATE SUBSTATIONS RELIEF (MW) REMARKS A.P
GOOTY SWITCHING STATION 200 SIGNAL WILL BE SENT THROUGH WIDE BAND ANANTHAPUR -DO- SOMAYAJULAPALLI KURNOOL KARNATAKA SOMANAHALLI EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND. KERALA TRICHUR NORTH KOZHIKODE TAMIL NADU MADURAI KARAIKUDI THIRUVARUR TRICHY 230 INGUR

INTER-TRIP SCHEME TRIP SIGNAL 1 WILL BE SENT TO SOMANAHALLI
REDUCTION IN POWER > 500&<1000MW SIGNAL A TRIP SIGNAL 1 WILL BE SENT TO SOMANAHALLI CHINKAMPALLI KOLAR ICT HOODY SRIPERUMBUDUR SALEM HOSUR THROUGH PLCC THROUGH WIDE BAND POWER FLOW >1000&<1500MW AND DC LINE FAULT AND POWER FLOW > 1500MW TRIP SIGNAL 2 SIGNAL B REDUCTION IN POWER > 1000MW AND TRIP SIGNAL 2 WILL BE SENT TO 1 GOOTY ANATHPUR SOMAYAJULUPALLI KURNOOL MADURAI KARAIKUDI TIRUVARUR TRICHY 230 KV INGUR 0 TRICHUR NORTH 1 KOZHIKODE

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