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

ISSUES KV KAIGA – GUTTUR KV MADURAI – TRIVENDRUM D/C LINE 8.0 TALCHER – KOLAR HVDC KV KAIGA – NARENDRA D/C LINE 10.0 EVACUATION SCHEMES FOR NEW CENTRAL SECTOR GENERATING STATIONS 11.1 UNREQUISITIONED POWER OF NTPC STATIONS 12.2 KALPAKKAM – EVACUATION SCHEME

ISSUES (Continued …) 13.1 TALCHER – KOLAR INTERTRIP SCHEME 14.1 ALTERNATE PATH FOR EVACUATION OF TALCHER STAGE 2 POWER 15.1 INTER REGIONAL TRANSMISSION LINKS BETWEEN ER/WR AND SR 16.1.i HIGH VOLTAGE CONDITIONS 16.1.ii KAIGA – GUTTUR TRIPPING DETAILS 16.1.iii HIGH FREQUENCY CONDITIONS 16.1.iv STOA – CHIKKODI – KOLHAPUR LINE

ISSUES (Continued …) FREQUENCY LINKED INCENTIVE

SCHEDULE DRAWAL GRAPHS INTER REGIONAL EXCHANGES SUMMARY OF UI

400 KV KAIGA – GUTTUR TRIPPING DETAILS DURING TRIPPING TYPICAL FLOWS DIFFERENT OPTIONS –ALTERNATIVE 1 (RADIALISATION OF LOAD) –ALTERNATIVE 2 (SPLIT BUS AT KAIGA) –ALTERNATIVE 3 (INTER TRIP OF LINES FROM KAIGA) LOAD FLOW STUDY RESULTS FOR –RADIALISATION OF CHIKODI, BELGAUM AND NARENDRA LOAD –PROVIDING AUTOMATIC INTER-TRIP SCHEMES AT KAIGA DIAGRAM

400 KV KAIGA GUTTUR D/C LINE PONDA (Goa) KOLHAPUR (MAHARASHTRA) CHIKKODI KARNATAKA BELGAUM NARENDRA 220 KADRA KAIGA AMBEWADI XELDEM(GOA) NAGJHARI KODASALLI HUBLI GUTTUR M.L.PURA NOT TO SCALE DISTANCES EXAGERATED FOR CONVENIENCE MAPUSA 220 KV CIRCUIT KV CIRCUIT 2

PROPOSED ALTERNATIVES FOR AVERTING TRIPPING OF GENERATORS AT KAIGA & KALI COMLEX DURING TRIPPING OF 400KV KAIGA-GUTTUR FEEDER II Note: The Figures in brackets shows the flows after tripping of 400KV Kaiga-Guttur ckt II TYPICAL MW FLOWS:- AROUND KAIGA AND KALI COMPLEX

ALTERNATIVE – I Note: The Figures in brackets shows the flows after tripping of 400KV Kaiga-Guttur Feeder – II. TYPICAL FLOWS :- AFTER RADIALISATION OF CHIKODI, BELGAUM & NARENDRA

ALTERNATIVE – 2 TYPICAL FLOWS :- SPLIT BUS OPERATION AT KAIGA KAIGA 400KV BUS SECTION - 1 ALL FIGURES IN MW GENERATOR 220KV 400KV KAIGA 400KV BUS - 1 KAIGA 220KV GUTTUR 220KV BUS GUTTUR 400KV BUS ~ 155 ~ SECTION - 2 KADRA KODASALLY NARENDRA 400KV BUS KAIGA 2 x 220 MW ICT BUS 1 KAIGA 220KV BUS 2 Continue …

ALTERNATIVE – 2 (Continued …) TYPICAL FLOWS :- SPLIT BUS OPERATION AT KAIGA

ALTERNATIVE – 3 TYPICAL FLOWS :- AFTER TRIPPING OF 400KV KAIGA-GUTTUR CIRCUIT II Note: The Figures in brackets shows the flows after tripping of 220kV Kaiga-Kaidra & Kaiga-Kodasalli.

TRIVANDRUM COCHIN THRISSUR MADURAI UDUMALPET ARASUR NLY-EXP NEYVELI BAHOOR PUGALUR TRICHY SALEM HOSUR MYSORE SP-BUDUR MELKOTTAIYUR ALMATHI CHITOOR KOLAR S’HALLI NLMNG HOODY JAYAMKONDAM KARAIKUDI MULTI-CIRCUIT TOWER ON 220 KV EDAMON- KAYATHAR CORRIDOR HASSAN KOZHIKODE 400 KV MAURAI – TRIVENDRUM D/C LINE

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 Cont..

THE ISSUES OF CONCERN HIGH VOLTAGE AT TRIVANDRUM During low demand and high monsoon period the high voltage persistant at Trivandrum has been addressed by – opening the 220 KV Edamon – Kayathar line – by opening one of the 400 KV line and increasing the load on the other 400 KV line Presently as the loads have been increased by KSEB, the voltages are within limits. Cont..

ADVANTAGES OF COMMISSIONING 400 KV KAIGA NARENDRA D/C LINE PONDA (Goa) KOLHAPUR (MAHARASHTRA) CHIKKODI KARNATAKA BELGAUM NARENDRA 220 KADRA KAIGA AMBEWADI XELDEM(GOA) NAGJHARI KODASALLI HUBLI GUTTUR M.L.PURA NOT TO SCALE DISTANCES EXAGERATED FOR CONVENIENCE MAPUSA 220 KV CIRCUIT KV CIRCUIT 2

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

HIGH FREQUENCY CONDITIONS IN SOUTHERN REGIONAL GRID

FREQUENCY PROFILE DURING THE MONTHS SEPTEMBER, OCTOBER, NOVEMBER 2005 Cont..

Issues Of Concern Wastage of Resources Grid Insecurity High Frequency also Causes High Voltage Damage to the Equipments Cont..

ACTIONS TO BE TAKEN TO ARREST HIGH FREQUENCY: Reservoir based hydro backing/closing Liquid Fuel Stations backing/closing down Inter Regional Export Thermal Stations to back down/Close down Hydro Stations to back down – even on overflowing stations With frequency > 50.5 Hz –back down even at overflowing hydro stations No sudden injection in the grid at freq > 50.2 Hz. Cont..

KADAMPARAI GENERATION/PUMP ENERGY FROM JAN GENERATOR MODE PUMP MODE GENERATOR MODE PUMP MODE GENERATOR MODE PUMP MODE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL

FREQUENCY CURVE FOR 24 th NOV 2005 FVI = 1.26 Avg Freq = 50.22Hz BACK

HIGH VOLTAGE CONDITIONS IN SOUTHERN REGIONAL GRID

VARIATION OF MAXIMUM VOLTAGES IN SR GRID DURING NOV 2005

2 Lines Kept Open > 98% of Time 7 Lines Kept Open > 75% of Time 14 Lines Kept Open > 50% of Time 23 Lines Kept Open > 20% of Time

KHAMMAM VIJAYAWADA N’SAGAR GAZUWAKA (POWERGRID) HYDERABAD RAICHUR GOOTY HOODY SALEM UDUMALPET TRICHUR MADURAI TRICHY MADRAS NEYVELI GUTTUR KAIGA RSTPP BHADRAVATI BANGALORE MUNIRABAD P P P P P P P P P P P P N KOLAR TALCHER JEYPORE HOSUR P SSLMM MMDP THIRUVANANTHAPURAM NELLORE NELAMANGALA KURNOOL KALPAKKA SIMHADRI NTPC HIRIYUR TALGUPPA SIRSI CUDDAPAH 1000 MW HVDC BACK TO BACK LINK 2000 MW HVDC BIPOLE 500 KV HVDC LINE 400 KV LINE POWERGRID 400 KV LINE APTRANSCO 400 KV LINE KPTCL 400 KV LINE OPERATED AT 220 KV THERMAL GENERATING STATION NEYVELI TPS – 1 (EXP) EXP 400KV SUB-STATION NARENDRA MAHABOOB NAGAR Cont.. 41 NO.s 400 KV LINES OPENED TO CONTAIN HIGH VOLTAGE

Actions Already Taken TAKING OUT THE LINE AND CONVERTING LINE REACTOR TO BUS REACTOR MVAR ABSORPTION BY GENERATING UNITS TRANSFORMER TAP CHANGES MANY ICT TAPS WERE CHANGED ON 400/220 ICT’s GT TAP CHANGES OPENING UP OF LIGHTLY LOADED REDUNDANT TIE LINES UTILISATION OF HYBRID AC/DC NETWORK DIVERSION OF TALCHER STAGE 2 POWER THROUGH GAJUWAKA

Issues Of Concern Frequent switching in/out of Lines –Resulting wear and tear of equipments Continuous High Voltage –Resulting damage to the equipments Network Redundancy is lost causing Security concerns Increase in Regional system losses

Desired Actions ABSORPTION OF VARS BY ALL THE OPERATING UNITS WITHIN THEIR CAPABILITY CURVES OPENING OF 220 KV AND BELOW LEVEL LIGHTLY LOADED LINES IN SATES GENERATORS ON SYNCH CONDENSOR MODE TO CARRY OUT DETAILED STUDIES TO FIND OUT REQUIREMENT OF ADDITIONAL REACTORS AT SUITABLE LOCATIONS

SYNCHRONOUS CONDENSOR OPERATION: IN OPERATION S. No Name of the Generator Unit No Installed capacity (In MW) Remarks 1N'Sagar2100Running 2N'Sagar3100Running 3N'Sagar4100Running 4N'Sagar5100Running 5N'Sagar6100Running 6N'Sagar7100Running 7N'Sagar8100Running 8SriSailam LBPH1150Tested 9SriSailam LBPH2150Tested 10SriSailam LBPH3150Tested 11SriSailam LBPH4150Running 12SriSailam LBPH5150Running 13Iddukki1130Running 14Iddukki2130Running 15Iddukki3130Running Cont..

LIST OF GENERATORS WITH PELTON TURBINE Cont..

MW MVAR 3 QUADRANT OPERATION Cont..

MW MVAR Cont..

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

Para 8 (ii) The beneficiaries will have full freedom for negotiating any transaction for utilisation of theircapacity shares. In such cases, the beneficiary having allocation in the capacity of the generating station will be liable for full payment of capacity charges and energy charges (including that for sale of power under the transactions negotiated by them) for all its scheduled and unscheduled transactions from its capacity share. (iii) If there is any capacity which remains un-requisitioned during day-to-day operation, RLDC, shall advise all beneficiaries in the region and the other RLDCs so that such capacity may be requisitioned through bilateral arrangements with the concerned generating company/beneficiary(ies) under intimation to the RLDC. SCHEDULE 1 OF ABT ORDER DATED Cont..

While on the subject of trading, the Commission anticipates an emerging situation of a surplus on account of the gap between the availability and scheduled generation. This power could go unutilised as the capacity for this generation is blocked because the capacity charges are borne by the beneficiary’ states. In order to economise operations, it would be appropriate to make use of this power on firm or non-firm basis with a suitable understanding between the beneficiary states and the generator. It is therefore suggested that the generating company may initiate a dialogue with the beneficiary states for making use of this power for which the terms could be negotiated by themselves. Though, strictly speaking, this tariff also falls within the jurisdiction of the Commission, due to the short term nature of this transaction the tariff could be freed to be negotiated for which a general exemption could be taken from the Commission. This would provide substantial additional revenue to the generator if he goes about aggressively marketing this surplus power. CLAUSE FROM THE EXTRACTS OF ABT ORDER DATED Cont..

FINAL REGULATIONS:TERMS&CONDITIONS OF TARIFF 26 MAR 2004 PARA-30. Billing and Payment of Capacity Charges: (ii) The beneficiaries shall have full freedom for negotiating any transaction for utilisation of their capacity shares. In such cases, the beneficiary having allocation in the capacity of the generating station shall be liable for full payment of capacity charges and energy charges (including that for sale of power under the transaction negotiated by him) corresponding to his total allocation and schedule respectively. (iii) If any capacity remains un-requisitioned during day-to-day operation, the Regional Load Despatch Centre shall advise all beneficiaries in the region and the other Regional Load Despatch Centres so that such capacity may be requisitioned through bilateral arrangements either with the concerned generating company or with the concerned beneficiary(ies) under intimation to the Regional Load Despatch Centre. The information regarding un-requisitioned capacity shall also be made available by the Regional Load Despatch Centres through their respective websites.

UNREQUISITIONED POWER OF NTPC STATIONS RSTPS UNIT 7 –SEP MU ( 05 Transactions) –OCT MU (15 Transactions) –NOV MU (11 Transactions) TALCHER STAGE 2 –NOV MU (08 Transactions) Cont..

EVACUATION SCHEMES FOR NEW CENTRAL SECTOR GENERATING STATIONS KOODANKULAM APP SPS FOR KOODANKULAM APP NEYVELI TS-II EXPANSION KAIGA STAGE -II

KUDANKULAM TRANSMISSION SYSTEM( 2000MW) LINES : = 950 Km. ESTIMATED COST = 1710 CRORES  KUDANKULAM-TIRUNELVELI 2 X 400 KV D/C LINES WITH 2 X 400 KV D/C LINES WITH QUAD (108 & 83 Km.) QUAD (108 & 83 Km.)  TIRUNELVELI-UDUMALPET D/C LINE WITH TWIN D/C LINE WITH TWIN MOOSE (300Km) MOOSE (300Km)  LILO OF BOTH CIRCUITS OF MADURAI-TRIVANDRUM LINE MADURAI-TRIVANDRUM LINE AT TIRUNELVELI ( 2 X 55 Km) AT TIRUNELVELI ( 2 X 55 Km)  EDAMON-MUVATTUPUZHA D/C LINE QUAD (150Km) D/C LINE QUAD (150Km)  TIRUNELVELI-EDAMON 400KV D/C LINE (110Km).  MUVATTUPUZHA-TRICHUR 400KV D/C LINE WITH QUAD CONDUCTORS (90Km) CONDUCTORS (90Km) T N KARNATAKA KERALA Contd..

KUDANKULAM TRANSMISSION SYSTEM( 2000MW) SUB-STATIONS  NEW 400/220KV SUBSTATIONS AT TIRUNELVELI, MUVATTUPUZHA MUVATTUPUZHA  AUGMENTATION OF TRANSFORMATION CAPACITY BY ONE TRANSFORMER EACH AT UDUMALPET & TRIVANDRUM S/S TRANSFORMER EACH AT UDUMALPET & TRIVANDRUM S/S SUPPLEMENTARY TRANSMISSION SYSTEM  LILO OF ONE CIRCUIT OF 400KV MADURAI-TRICHY AT KARAIKUDI ( 60 Km) ALONG WITH SUBSTATION AT AT KARAIKUDI ( 60 Km) ALONG WITH SUBSTATION AT KARAIKUDI (TAMILNADU) KARAIKUDI (TAMILNADU)  LILO OF ONE CIRCUIT OF TALAGUPPA-NELAMANGALA 400KV LINE AT HASSAN ( 80 KM) ALONG WITH SUBSTATION AT 400KV LINE AT HASSAN ( 80 KM) ALONG WITH SUBSTATION AT HASSAN.(KARNATAKA) HASSAN.(KARNATAKA)

KAIGA 3 & 4 TRANSMISSION SYSTEM LINES : 413 Kms  MYSORE-KOZHIKODE D/C LINE  LILO OF KOLAR-SRIPERUMBADUR AT MELAKOTTAIYUR (40KM) AT MELAKOTTAIYUR (40KM)  NARENDRA-DAVANGERE D/C LINE SUB-STATION : 2 Nos. New  NEW 400/220KV SUBSTATION AT KOZHIKODE & MELAKOTTAIYUR KOZHIKODE & MELAKOTTAIYUR  2 ND 315MVA TRANSFORMER AT HIRIYUR S/S. HIRIYUR S/S.  BAY EXTENSION AT NARENDRA, DAVANGERE (KPTCL) & HIRIYUR. HIRIYUR. COST ESTIMATE : 512 CRORES KERALAKERALA

NLC-TS-II EXPANSION TRANSMISSION SYSTEM LINES : 467 Km.  2 NOS. 400KV S/C LINES FROM NEYVELI-TS-II (EXISTING) NEYVELI-TS-II (EXISTING) TO NLC TS-II (EXPAN) (8 KM). TO NLC TS-II (EXPAN) (8 KM).  NEYVELI-PUGALUR D/C LINE  PUGALUR-MADURAI D/C LINE  UDUMALPET-ARASUR D/C LINE  LILO OF NEYVELI-SRIPERUMBU- DUR LINE AT PONDY. DUR LINE AT PONDY. SUB-STATION  NEW 400/220KV SUBSTATIONS AT PUGALUR, ARASUR & PONDICHERRY. PONDICHERRY. COST ESTIMATE : 721 CRORES T N KERALAKERALA KARNATAKA

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

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 Contd..

APKARKERTNPONDY Total UI exported(-) / Imported(+) in MUs Total amount paid in Crores Rs Average rate of UI in paise/unit SUMMARY OF UI – 153WKS (FROM 01/JAN/03 TO 04/DEC/05) Contd..

IMPLEMENTED SCHEME TO ENSURE GRID STABILITY a) 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 b) 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 250 m sec  UNIT # 6 TRIPPED AFTER 500 m sec NOTE: STAGGERED TRIPPING IS ADOPTED TO ALLOW THE POWER SUMMATED SIGNAL RESETTING Continue ……

Inter Trip Scheme Continue ……

Suggestions By SR Constituents The Scheme has been worked out by CEA depending on the generation at Talcher Stage2. But SR Constituents requested that the measurement of power be made at Talcher I & II interconnection point. CEA assured to examine the technical possibilty of the above. The scheme will be reviewed after commissioning of Tala Transmission system by June 2006 after carrying out the studies - the flows and the jerks absorption by ER-WR-NR system.

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. COMMISSIONED ON PRESENT KOLAR INTER TRIP LOGIC Continue ……

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

PRESENT INTER-TRIP POINTS 1) Chinakampally4) Hosur 2)Kolar ICT5)Sriperumbudur 3)Hoody6)Salem Continue ……

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. Continue ……

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. Continue ……

STATESUBSTATIONSRELIEF (MW) REMARKS A.PCHINAKAMPALLI150EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND. KARNATAKAKOLAR ICT250THROUGH LOCAL PILOT WIRING HOODYTHROUGH PLCC TAMIL NADUHOSUR300THROUGH PLCC SRIPERUMBUDUREARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND. SALEMEARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND. TRIP SIGNAL 1: POINTS Continue ……

STATESUBSTATIONSRELIEF (MW) REMARKS A.PGOOTY SWITCHING STATION 200SIGNAL WILL BE SENT THROUGH WIDE BAND ANANTHAPUR-DO- SOMAYAJULAPALLI-DO- KURNOOL-DO- KARNATAKASOMANAHALLI200EARLIER THE SIGNAL WAS BEING SENT BY PLCC. NOW IT IS PROPOSED TO SEND THIS SIGNAL THROUGH WIDE BAND. KERALATRICHUR NORTH200SIGNAL WILL BE SENT THROUGH WIDE BAND KOZHIKODE-DO- TAMIL NADUMADURAI200-DO- KARAIKUDI-DO- THIRUVARUR-DO- TRICHY 230-DO- INGUR-DO- TRIP SIGNAL 2: POINTS Continue ……

LOCATIONS IN DIFFERENT STATES LOGIC DIAGRAM FOR PROPOSED GENERATION OF GRADED SIGNAL AT KOLAR FOR COMPENSATING DIFFERENT LOSS OF POWER FLOW IN HVDC TALCHER-KOLAR LINK AND TRANSMISSION OF TRIP SIGNAL TO DIFFERENT LOCATIONS DC LINE FAULT WITH ANTECEDENT POWER FLOW ( ONE SEC PRIOR ) > 1000 MW AND ≤ 1500 MW DC LINE FAULT WITH ANTECEDENT POWER FLOW (ONE SEC PRIOR) > 1500 MW

TALCHER – KOLAR HVDC DETAILS OF IMPORT OF ENERGY TRIPPING DETAILS

TALCHER-KOLAR IMPORT OF 23850MUs FROM ER THROUGH TALCHER-KOLAR UPTO NOV - 05 YEAR ---> MONTHS TOTAL ENERGY (IN MU) MAX FLOW (IN MW) TOTAL ENERGY (IN MU) MAX FLOW (IN MW) TOTAL ENERGY (IN MU) MAX FLOW (IN MW) TOTAL ENERGY (IN MU) MAX FLOW (IN MW) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC TOTAL AVERAGE MAX FLOW

1.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. 3.NAGJHERI & KAIGA GENERATION WAS AROUND 800MW. 4.CHIKKODI, BELGAUM, NARENDRA, AMBEWADI & GOA LOADS ARE AROUND MW. 5.POWER RUSHED TO GUTTUR THROUGH 220KV KAIGA-GUTTUR LINE. 6.AT 16:21HRS, 220KV KAIGA-GUTTUR LINE ALONG WITH KAIGA UNITS TRIPPED. 7.KAIGA & NAGJHERI COMPLEX FREQUENCY SHOOT UP TO 52.6HZ. 8.SUBSEQUENTLY ALL NAGJHERI WERE TRIPPED AT 16:33HRS. KAIGA TRIPPING ON 07 th NOV 05

Inter Regional Links Present IR Capacity = 9,500 MW 700 MW 1200MW 2000MW 1200 MW 900 MW 30,500 MW 16,000 32,700 MW 34,500 MW MW 1650 MW Contd..

HVDC STATION KOLAR (KARNATAKA ) TALCHER ORISSA ) TALCHER KOLAR HVDC LINE LENGTH:100 KMS INTER REGIONAL LINKS CHIKKODI KOLHAPUR SUMMARY UJJAIN KOTLA

KALPAKKAM FAST BREEDER REACTOR(500 MW) EVACUATION

ARANI VILLUPURAM ACHARAPAKKAM KALPAKKAM SPKOIL KPFBR EVACUATION SCHEME SIRUCHERI KANCHEEPURAM TO SRIPERUMBUDUR MAPS – KPFBR LINK IS THROUGH A 230 KV D/C CABLE WITH SPARE PHASE. KPFBR Contd.. TO SINGARPET

KPFBR EVACUATION SCHEME KANCHEEPURAM AND SIRUCHERI ARE CONNECTED TO THE GRID THROUGH 230 KV NETWORK. POSSIBILITY OF CONNECTING THEM THROUGH LILO OF ARANI-SRIPERUMBUDUR MAY BE EXAMINED TWIN-MOOSE CAN BE CONSIDERED FOR ARANI LINE CHENNAI CITY ISLANDING SCHEME COULD BE EVOLVED AT 230 KV LEVEL WITH MAPS, NCTPS,ETS AND GMR Contd..

CHENNAI RING MAIN KOLAR MELKOTTAIYUR ALMATHI FROM NELLORE SRIPERUM BUDUR TO NEYVELI TO CHITTOOR

BACKUP TRANSMISSION SYSTEM TO CATER TO OUTAGE OF TALCHER KOLAR OPERATIONAL STUDIES

OPERATIONAL STUDY FOR BACKUP TRANSMISSION SYSTEM FOR TALCHER-KOLAR OUTAGE 400 KV SYSTEM GENERATION PATTERN ASSUMED SIMHADRI 1000 MW IMPORT AT GAZUWAKA 1495 MW GENERATION AT VEMAGIRI 1500 MW GENERATION AT VEMAGIRI INCLUDES VEMAGIRI CCGT +KONASEEMA+GOUTHAMI LINES TO VEMAGIRI COMPLEX STATIONS NOT MODELLED GAZUWAKA KALPAKA SIMHADRI VEMAGIRI NUNNA 364 MW EACH 112 MW EACH 620 MW EACH 1495 MW FROM ER TO KHAMMAM 384 MW EACH NELLORE 595 MW EACH 145 MW EACH Contd..

OPERATIONAL STUDY FOR BACKUP TRANSMISSION SYSTEM FOR TALCHER-KOLAR OUTAGE 220 KV SYSTEM ANNEXURE-1 PAGE 2 OF 2 FROM KALPAKA VEMAGIRI NUNNA 10 MW EACH BOMMUR VJS(N) 123 MW EACH 102 MW EACH TO VTS 128 MW BHIMADOLU 141 MW EACH PEDDAPURA M 135 MW BHIMAVARAM NIDADAVOLU KV BUS 142 MW 96 MW EACH Contd..

3 rd 500 MW B2B AT GAJUWA RELATED ISSUES STRENGTHENING OF AC NETWORK IN AP SYSTEM –THE 400 KV EVACUATION LINES FROM NUNNA, ESPECIALLY, NUNNA- NELLORE-CHENNAI MAY FACE INCREASED LOADINGS DEPENDING ON THE LOAD PROFILE IN N.COASTAL AP AND TN + KERALA SYSTEMS. –HOWEVER, WITH THE CHANGE IN LOAD PATTERN IN AP SYSTEM, AS WELL AS IN DIFFERENT ZONES IN AP, THE LINE LOADING PATTERN SHALL CHANGE AND IN ORDER TO ARRIVE AT A CORRECT DECISION AS FAR AS PLANNING OF TRANSMISSION NETWORK IS CONCERNED, THE STUDIES NEEDED TO BE CARRIED OUT. –MORE GAS/CCGT GENERATION IS LIKELY TO COME IN THE BASIN AREA, WHEREAS THERE MAY NOT BE SUBSTANTIAL LOAD INCREASE. VIJAYAWADA WOULD BECOME A POOLING POINT –PROTECTION ISSUES –SC LEVELS TO BE EXAMINED SPS SYSTEM TO BE WIRED FROM TALCHER TO SENSE POLE OUTAGE AND RAMP POWER AT GAZUWAKA THE ADEQUACY OF THE VOLTAGE PROFILE/ VAR MANAGEMENT ON THE ER SIDE IS TO BE ENSURED. ( Particularly during the low generation period in Southern Orissa)

RAICHUR-PARLE LINE OPERATIONAL ASPECTS

PARLE(WR)-RAICHUR(SR) N’SAGAR MEHBOOBNAGAR PARLE RAICHUR GUTTUR GOOTY HIRIYUR NELMANGALA MBD HOODY TO MYS/KOZHI KURNOOL S’HALLI FROM KAIGA FROM STRP Contd..

AC vis-à-vis DC INTERCONNECT OPERATIONAL ISSUES SINGLE AC LINK BETWEEN TWO LARGE GRIDS MAY CAUSE PROBLEMS ESPECIALLY ON TRIPPING OF 2000 MW TALCHER-KOLAR HVDC LINK –POWER FLOW ON SINGLE AC LINK (PARLE-RAICHUR) WOULD INCREASE SUBSTANTIALLY –EVACUATION FROM RAICHUR MAY ALSO CAUSE PROBLEM –NEELAMANGALA BEING THE MAIN POOLING POINT MAY ALSO BE EXPOSED EXTRA PRESSURE –THERE MAY BE SUDDEN RISE IN POWER FLOW THROUGH RAIPUR – ROORKELA LINE NETWORK SHOULD BE SUFFICIENTLY MATURE WITH PROPER PROTECTION SYSTEM IN PLACE BLACK START RESTORATION –WITH ASYNCHROUNOU CONNECTION, STARTUP POWER FROM ONE REGION TO OTHER REGION CAN BE MADE WITH EASE AC INTERCONECTION MERITS COST WOULD BE LESS AC INTERCONECT WOULD HELP IN SEAMLESS OPERATION (THIS COULD ALSO MEAN UNCONTROLLED FLOWS DURING CONTINGENCY)

TIRUNELVELI KOODANKULAM TRIVANDRUM EDAMON COCHIN THRISSUR MADURAI UDUMALPET ARASUR NLY-EXP NEYVELI BAHOOR PUGALUR TRICHY SALEM HOSUR MYSORE SP-BUDUR MELKOTTAIYUR ALMATHI CHITOOR KOLAR S’HALLI NLMNG HOODY KOODANKULAM TRANSMISSION SYSTEM JAYAMKONDAM KARAIKUDI MULTI-CIRCUIT TOWER ON 220 KV EDAMON- KAYATHAR CORRIDOR HASSAN KOZHIKODE

220 KV CHIKKODI – KOLHAPUR D/CLINE PONDA (Goa) KOLHAPUR (MAHARASHTRA) CHIKKODI KARNATAKA BELGAUM NARENDRA 220 KADRA KAIGA AMBEWADI XELDEM(GOA) NAGJHARI KODASALLI HUBLI GUTTUR M.L.PURA NOT TO SCALE DISTANCES EXAGERATED FOR CONVENIENCE MAPUSA 220 KV CIRCUIT KV CIRCUIT 2

STOA Charges Analysis/Comparision DETAILS BACK