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Meeting for ER-NR Synchronization on 11 th August 2006

Meeting for ER-NR Synchronization on 11 th August 2006. POWERGRID, NEW DELHI. ER-NR inter-connection through TALA transmission system. Tala (6X170=1020 MW). BHUTAN. 63. NR. ER. INDIA. 18 km. NR map. PURNEA. 144 km. 1X315 MVA XFMR. 139 km. MUZAFFARPUR. 160 km. 2X315 MVA XFMR.

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Meeting for ER-NR Synchronization on 11 th August 2006

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  1. Meeting forER-NR Synchronizationon 11th August 2006 POWERGRID, NEW DELHI

  2. ER-NR inter-connection through TALA transmission system Tala (6X170=1020 MW) BHUTAN 63 NR ER INDIA 18 km NR map PURNEA 144 km 1X315 MVA XFMR 139 km MUZAFFARPUR 160 km 2X315 MVA XFMR 242 km 63 63 TO BONGAIGAON GORAKHPUR 63 63 63 168 km 63+ 63 63 261 km BINAGURI 2X315 MVA XFMR 63 2X315 MVA XFMR 50 63 TO MALDA LUCKNOW 246 km 1X315 MVA XFMR BAREILLY 50 46 km 2X315 MVA XFMR ER map 50 GORAKHPUR UP MOTIRAM ADDA TO BIHARSHARIF 70 km 50 250 km 50 63 50 50 50 50 TO MANDAULA UNNAO 2X315 MVA XFMR To Panki To Agra

  3. Transmission Lines

  4. Preparedness for synchronization Northern Region

  5. Anchoring at Lucknow (PGCIL) TO GORAKHPUR (POWERGRID) TO UNNAO (UP) Tala System LUCKNOW (POWERGRID) 1X315 MVA 400/220 kV XFMR TO UNNAO (UP) TO MORADABAD TO SULTANPUR TO UNCHHAR TO MANDAULA SITAPUR CHINHAT LUCKNOW (UP) HARDOI ROAD SHAHJANPUR 2X240 MVA 400/220 kV XFMR 2X315 MVA 400/220 kV XFMR BAREILLY TO SINGRAULI TO UNNA0 TO 220 kV BAREILLI TO UNNAO (UP)

  6. Tala System Anchoring at Gorakhpur (PGCIL) TO LUCKNOW (POWERGRID) TO MUZAFFARPUR (POWERGRID) 50 MVAR 50 MVAR GORAKHPUR (POWERGRID) 2*315 MVA 400/220 kV XFMR TO AZAMGARH 50 MVAR GORAKHPUR (UP) GORAKHPUR 220 kV (UP) BASTI (UP) TO DEORIA TANDA (UP) TO SULTANPUR

  7. Elements to be made available in NR • Contingency arrangement of 400 kV Kanpur Auraiya • LILO of 220 kV Mainpuri-Harduaganj-I at Mainpuri(PG) • LILO of 220 kV Mainpuri-Firozabad at Mainpuri (PG) • 2 x 240 MVA, 400/220 kV ICTs at Obra • 220 kV Gorakhpur(UP 400 kV)-220 kV Gorakhpur(old)-I • Closing of loops in U.P. system UP Power Map NR Power Map NR Line Diagram

  8. 400 kV Kanpur-Agra ckt 2 by utilizing Kanpur-Auraiya To Unnao To Ballabgarh To Muradnagar To Obra To Bassi 400 kV Agra Panki To Ballabgarh 6 km 166 km 400 kV Kanpur To Allahabad New element 400 kV Auraiya 67 km

  9. Preparedness for synchronization Eastern Region

  10. Anchoring at Muzaffarpur (PGCIL) TO GORAKHPUR (POWERGRID) TO PURNEA (POWERGRID) 63 MVAR 63 MVAR 63 MVAR 63 MVAR 63 MVAR Tala System MUZAFFARPUR (POWERGRID) 1x315 MVA 400/220 kV XFMR ER map MUZAFFARPUR Kanti-(BSEB) Bihar 3*315 MVA 400/220 kV XFMR Radial Load Jharkhand BIHARSHARIF (BSEB) FATUHA TO BODHGAYA TO TENUGHAT

  11. Radial load on Muzaffarpur Eastern Region

  12. Nepal Muzaffarpur 220kV Kept Normally open Madhubani Motihari Betiah Ramnagar Pandaul Nepal MTPS Darbhanga 2x100MVA Sitamari Gopalgunj Samastipur Muzf Town Ekma Hazipur MB TB Siwan Chapra Purnea BSEB Radialised Load ( 150 MW) Not connected 220 kV line Charged at 132kv Barauni Biharsariff Hatidah North Bihar System- prior to radialisation at Muzaffarpur

  13. Nepal Muzaffarpur 220kV Kept Normally open Madhubani Motihari Betiah Ramnagar Pandaul Nepal MTPS Darbhanga 2x100MVA Sitamari Gopalgunj Samastipur Muzf Town Ekma Hazipur TB MB Siwan Chapra Purnea BSEB Radialised Load (70-80 MW) 220 kV line Charged at 132kv Not connected Barauni Biharsariff Radialisation on Muzaffarpur 8th Aug 2006, 12:12 Hrs Hatidah

  14. Nepal Muzaffarpur 220kV Kept Normally open Madhubani Motihari Betiah Ramnagar Pandaul Nepal MTPS 100MVA Darbhanga 2x100MVA Sitamari Gopalgunj Samastipur Muzf Town Ekma Hazipur Siwan Chapra Purnea BSEB Radialised Load ( 150 MW) 220 kV line Charged at 132kv Not connected Barauni Biharsariff Hatidah Extension of Radial Load – 9th Aug’2006

  15. SUGGESTED RADIAL OPERATION WITH 1 X100MVA ICT AT MTPS -KANTI

  16. Nepal Muzaffarpur 220kV Kept Normally open Madhubani Motihari Betiah Ramnagar Pandaul Nepal MTPS Darbhanga 1x100MVA Sitamari Gopalgunj Samastipur Muzf Town Ekma Hazipur MB TB Siwan Chapra Purnea BSEB Radialised Load ( 50-55 MW) 220 kV line Charged at 132kv Not connected Barauni Biharsariff Hatidah

  17. Restoration of Outaged Elements Eastern Region

  18. Eastern Region Network To NR Tala System ER map ToBegusarai Pusauli Khagol ToMuzaffarpur 2 x 315 MVA Fatuha X Arrah ToSahupuri Dehri Bodh Gaya 3 x 315 MVA Jharkhand BiharSharif Bihar Patratu Tenu Ghat ToKhalgaon

  19. Grid Discipline

  20. Synchronous Interconnection of Northern Grid with Central Grid • “Large grid” comprising of NER, ER, WR & NR • Over 250 power stations • Total installed generation capacity of 88,000 MW • Operating size of 60,000 MW • Cover 80% of the country’s area • Cater to 78 % of country’s population • Comparable to the system affected during the US Blackout of 14th August 2003 (10 % of Eastern Interconnection)

  21. Paradigm shift in system operation • Greater emphasis on • Network reliability • Protection systems • Grid discipline • Handling emergencies

  22. Grid Discipline • Tie-line control and network loading important • Frequency might be a misleading • Overdrawals/ under drawals to be kept within safe limits • OD/UD reflected on the ER-NR & ER-WR tie-line flows. • Ramping up and ramping down of generation, switching in and out of loads have to be done gradually • RLDC instructions to be followed States Generators

  23. Protection System

  24. Major Trippings incidents Three large incidents have occurred in 2006-07 in Northern Region

  25. Defence Plans • Suggested UFR settings • NR & WR • 1st stage : 48.8 Hz, instantaneous • 2nd stage: 48.6 Hz, instantaneous • 3rd stage: 48.2 Hz, instantaneous • ER (No change) • 1st stage: 48.5 Hz, instantaneous • 2nd stage 48.2 Hz, instantaneous • Settings of df/dt relays in WR & NR to be reviewed

  26. Optimal/Continuous use of Inter-regional radial links

  27. Pusauli B/B HVDC Northern Region Eastern Region Bhutan 220 kV Ujjain-Kota/Morak 400 kV Gorakhpur-Muzaffarpur 220 kV Malanpur-Auraiya Vindhyachal B/B HVDC 220 kV Sahupuri-Pusauli North Eastern Region 400 kV Raipur-Rourkela Western Region 220 kV Chikhodi-Kolhapur 220 kV Korba-Budhipadar Bhadravati B/B HVDC Upper Sileru-Balimela Gazuwaka B/B HVDC Southern Region Talchar-Kolar bi-pole HVDC

  28. Handling Contingencies

  29. Impact of loss of 1800 MW generation in NR 10000 MW ER-NER Grid 25000 MW NR Grid 1050 MW 25000 MW Western Grid 750 MW No primary response Frequency drop of 1 Hz Reduction in NR load by 750 MW Flow on ER-NR interconnector = 1800 MW-750 MW = 1050 MW Equivalent to reduction in ER+WR+NER Grid load by 1050 MW Contribution from WR = 750 MW

  30. Impact of loss of 1800 MW generation in WR 10000 MW ER-NER Grid 25000 MW NR Grid 750 MW 25000 MW Western Grid 1050 MW No primary response Frequency drop of 1 Hz Reduction in WR load by 750 MW Flow on ER-WR interconnector = 1800 -750 = 1050 MW Equivalent to reduction in NR + ER Grid load by 1050 MW Contribution from NR = 750 MW

  31. Thank You !

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