Pallatana-Bongaigaon Pallatana-Bongaigaon

Transmission SystemTransmission System

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Generation Project Summary

Pallatana (726.6 MW) : being implemented by OTPC– Unit - 1 : Dec-2011– Unit - 2 : March-2012

Bongaigaon (750 MW) : being implemented by NTPC– Unit - 1 : July-2012

Beneficiaries– Constituents of North Eastern Region

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Pallatana - Bongaigaon Transmission System

Trans. System Under NETC (JV of OTPC, PG & NER States)– Pallatana – Silchar – Bongaigaon 400kV D/c line

Trans. System (Under POWERGRID)– BTPS - Bongaigaon 400kV D/c line– Silchar – Badarpur(PG) Sw. Stn. interconnecting 132kV D/c line– Silchar – Srikona 132kV D/c– Silchar – Hailakandi 132kV D/c– Pallatana - Surajmaninagar 400kV D/c line (charged at 132kV)– Silchar – P. K. Bari (TSECL) 400kV D/c line (charged at 132kV)– Silchar – Melriat (New) 400kV D/c line (charged at 132kV)– Melriat (New) – Melriat(Mizoram) interconnecting 132kV D/c line– Silchar - Imphal(New) 400kV D/c line (charged at 132kV)– LILO of Loktak- Imphal(PG) 132kV S/c line at Imphal(New)– LILO of Kathalguri-Misa 400kV (op. at 220kV) S/c at New Mariani

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Pallatana - Bongaigaon Transmission System

Trans. System (Under POWERGRID -Contd.)– Mariani(new)-Mokokchung (PG) 220kV D/c line– Mokokchung (PG)-Mokokchung (Naga) 132kV D/c (Zebra

cond.)– Pasighat – Roing 132kV S/c line (on D/c tower)– Roing – Tezu 132kV S/c line (on D/c tower)– Tezu – Namsai 132kV S/c line (on D/c tower)– 2x200MVA, 400/132kV New S/s at Silchar – 2x50MVA, 132/33kV New S/s at Melriat New (upgradable to

400kV)– 2x50MVA, 132/33kV New S/s at Imphal New (upgradable to

400kV)– 220kV New Switching S/s at Mariani – 2x50MVA, 220/132kV New S/s at Mokokchung– 2x15 MVA, 132/33kV New S/s at Roing– 2x15 MVA, 132/33kV New S/s at Tezu– 2x15 MVA, 132/33kV New S/s at Namsai

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Pallatana - Bongaigaon Transmission System(under scope of other agencies)

NTPC– 400/220kV, 2x315MVA transformers at BTPS (NTPC) switchyard– 220kV Connectivity between NTPC and AEGCL switchyard– 2 nos. of 400kV line bays for BTPS – Bongaigaon 400kV D/c line

OTPC– 400/132kV, 2x100MVA transformers at Pallatana switchyard– 2 nos. of 400kV line bays for Pallatana-Silchar 400kV D/c line– 2 nos. 132kV line bays for Pallatana-Surajmaninagar 132kV D/c (upgrad. to 400kV)– 50MVAR line reactor in each ckt of Pallatana-Silchar 400kV D/c line at Pallatana end – 80MVAR bus reactor at Pallatana Generation Switchyard.

Assam– 2x315MVA, 400/220kV New Substation at Azara– LILO of Silchar-Bongaigaon 400kV D/c line at Azara – LILO of Agia-Guwahati 220kV D/c line at Azara– 63MVAR line reactor in Silchar-Azara 400kV line at Azara end – 63MVAR bus reactor at Azara

Meghalaya– LILO of one ckt of Silchar-Bongaigaon 400kV D/c line at Byrnihat– 2x315MVA, 400/220kV New Substation at Byrnihat– 50MVAR line reactor in Silchar-Byrnihat 400kV line at Byrnihat end – 63MVAR bus reactor at Byrnihat

Tripura– 2x50MVA, 132/33kV substation at Surajmaninagar (upgradable to 400kV)– Monarchak – Surajmaninagar 132kV D/c– Monarchak – Rabindranagar 132kV D/c– Surajmaninagar – P. K. Bari 400kV D/c to be charged at 132kV – 132kV S/s at Rabindranagar

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Minimum Trans. System required with 1st unit of Pallatana

Trans. System Under NETC (JV of OTPC, PG & NER States)– Pallatana - Silchar 400kV D/c line

Trans. System (Under POWERGRID)– Pallatana - Silchar 400kV D/c line– 2x200 MVA, 400/132kV new S/s at Silchar– Silchar - Badarpur(PG) 132kV D/c line– Silchar - Srikona (Assam) 132kV D/c line– Silchar - Hailakandi(Assam) 132kV D/c line with

LILO of Panchgram-Dullabhchera 132kV S/c line of AEGCL to connected it with Silchar-Hailakandi 132kV D/c line so as to form Silchar - Panchgram and Pallatana - Silchar 132kV lines (as agreed in NERPC)

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Trans. System likely to be commissioned with 2nd unit of Pallatana (scheduled in March-2012)

Trans. System Under NETC (JV of OTPC, PG & NER States)– Silchar - Bongaigaon 400kV D/c line

Trans. System (Under POWERGRID)– Pallatana - Surajmaninagar 400kV D/c line (to be operated at 132kV)– Surajmaninagar – P. K. Bari 400kV D/c to be charged at 132kV

Trans. System (Under OTPC)– 2x100 MVA, 400/132kV ICT at Pallatana

Trans. System (Under Tripura Scope)– 2x50MVA, 132/33kV substation at Surajmaninagar (upgradable to

400kV) Trans. System (Under Meghalaya Scope)

– 2x315MVA, 400/220kV substation at Byrnihat alongwith LILO of one ckt. of Silchar – Bongaigaon 400kV D/c line

Note : In absence of Byrnihat S/s, upto 500 MW can be evacuated through Silchar (2x200 MVA) and Pallatana (2x100 MVA) ICTs

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Major Concerns

Construction of new S/s at Surajmaninagar (Tripura)– Pallatana – Surajmaninagar 132kV D/c being constructed by

POWERGRID to provide alternate path for evacuation as well as anticipated to be used for start-up power

– New 2x50 MVA, 132/33kV S/s at Surajmaninagar required for termination of Pallatana – Surajmaninagar 132kV D/c

– Awarded by Tripura, needs to be expedited.

Construction of new 400kV S/s at Byrnihat (Meghalaya)– 2x315 MVA, 400/220kV S/s at Byrnihat to established by LILO

of one circuit of Silchar – Bongaigaon 400kV D/c line– Critical for smooth operation of 408 kms long Silchar –

Bongaigaon 400kV section– MeSEB signed agreement with POWERGRID for construction

of Byrnihat S/s as consultancy works– Scheduled to be completed in 30-36 months provided all

formalities like release of payment, hand over of land etc. are completed at the earliest, which are still awaited

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Major Concerns

Construction of new 400kV S/s at Azara (Assam)– 2x315 MVA, 400/220kV S/s at Azara to established by LILO of

Silchar - Bongaigaon 400kV D/c line– Critical for smooth operation of 408 kms long Silchar –

Bongaigaon 400kV section– Activities for construction yet to be started by Assam

Strengthening beyond Bongaigaon– NER may have surplus during off-peak period (even though

entire power from Pallatana & Bongaigaon have been allocated to NER states

– Strengthening beyond Bongaigaon needs to be implemented promptly for reliable transfer of power

– POWERGRID is implementing re-conductoring of Siliguri-Purnea 400kV D/c line, expected to be completed by March, 2012

– Bongaigaon – Siliguri & Purnea – Biharsharif 400kV D/c lines are being implemented under private sector and have been awarded to M/s Sterlite. Implementation of the same needs to be expedited

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