Meeting for er nr synchronization on 11 th august 2006
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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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Meeting for er nr synchronization on 11 th august 2006

Meeting forER-NR Synchronizationon 11th August 2006

POWERGRID, NEW DELHI


Er nr inter connection through tala transmission system

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


Transmission lines

Transmission Lines


Preparedness for synchronization

Preparedness for synchronization

Northern Region


Anchoring at lucknow pgcil

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)


Anchoring at gorakhpur pgcil

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


Elements to be made available in nr

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


400 kv kanpur agra ckt 2 by utilizing kanpur auraiya

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


Preparedness for synchronization1

Preparedness for synchronization

Eastern Region


Anchoring at muzaffarpur pgcil

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


Radial load on muzaffarpur

Radial load on Muzaffarpur

Eastern Region


Meeting for er nr synchronization on 11 th august 2006

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


Meeting for er nr synchronization on 11 th august 2006

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


Meeting for er nr synchronization on 11 th august 2006

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


Suggested radial operation with 1 x100mva ict at mtps kanti

SUGGESTED RADIAL OPERATION WITH 1 X100MVA ICT AT MTPS -KANTI


Meeting for er nr synchronization on 11 th august 2006

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


Restoration of outaged elements

Restoration of Outaged Elements

Eastern Region


Eastern region network

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


Grid discipline

Grid Discipline


Synchronous interconnection of northern grid with central grid

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)


Paradigm shift in system operation

Paradigm shift in system operation

  • Greater emphasis on

    • Network reliability

    • Protection systems

    • Grid discipline

    • Handling emergencies


Grid discipline1

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


Protection system

Protection System


Meeting for er nr synchronization on 11 th august 2006

Major Trippings incidents

Three large incidents have occurred in 2006-07 in Northern Region


Defence plans

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


Optimal continuous use of inter regional radial links

Optimal/Continuous use of Inter-regional radial links


Meeting for er nr synchronization on 11 th august 2006

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


Handling contingencies

Handling Contingencies


Impact of loss of 1800 mw generation in nr

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


Impact of loss of 1800 mw generation in wr

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


Thank you

Thank You !


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