restoration procedure of ner grid nov-2013
TRANSCRIPT
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BLACK START
AND
RESTORATION PROCEDURES
OF
NER GRID
- 9
:2013
( )
,
7930069th Revision
Month: November2013
POWER SYSTEM OPERATION CORPORATION LTD(A wholly owned subsidiary of POWERGRID)
NORTH EASTERN REGIONAL LOAD DESPATCH CENTRE,Shillong793006
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Black start and Restoration Procedures of NER Grid
INDEX
CHAPTER DESCRIPTION PAGE NO
1 Black Start Facility 1-3
2 System Restoration Approach 4-9
3 Power Maps of NER 10-18
4 Network Diagram of NER 19-27
5 Broad classification of North Eastern Regional Grid 28-34
6 Black Start & Restoration Procedures 35-76
6.1 Restoration of NER Grid after total collapse, when
power from Eastern Region (ER) is available
36-55
6.2 Restoration of NER Grid after total collapse, when
power from Eastern Region (ER) is not available
56-71
6.3 Restoration of 400 / 132 kV Network comprising of
Manipur, South Assam, Mizoram, Tripura, AGTPP and
Palatana after partial collapse.
72-75
6.4 Restoration of 132 kV Network comprising of Manipur
(except Jiribam) and Loktak, after partial collapse.
76-76
7 Reporting Procedure 77-81
List of Annexures
Annexures DESCRIPTION PAGE NO
i) List of Power Stations with black start facilities 83
ii) List of Major sub-stations with synchromising facilities 84
iii) List of shunt reactors in NER 85
iv) Addition of New Transmmission Lines 86
v ) Three phase fault level of Major Sub-stations in NER 87
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Black start and Restoration Procedures of NER Grid
North Eastern Regional Load dispatch Centre, Shillong
Black Start Facil i ty1.1 ----- Existing Black Start Facilities
1.2 ----- Survival/ Auxiliary Power requirement
1.3 ----- Startup power requirement
1.4 ----- Synchronizing facilities at Power Stations / major Sub-Stations
1.5 ----- Shunt Reactors at major Power Station and Sub-Stations
CHAPTER 1
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Black start and Restoration Procedures of NER Grid
1.1 Existing Black Start Facilities:
A list of Generating Stations of NER (North Eastern Region) having black start facilities
is elaborated in Annexure-I
1.2 Survival/ Auxiliary Power requirement:
Survival/Auxiliary power is required to avoid damages of some equipment as well as
functioning of some essential facilities, in case of supply failure. Immediate
arrangement of power is very essential for the following:-
1. Battery Charging
2. Emergency Lighting
3. Compressors for breaker operation4. Lubricating Oil Pumps
5. Communication & Telemetry System
6. Turbine Emergency Oil Pump
In power stations of NER, auxiliary power requirement is very nominal i.e. around 100-
150 kW as unit sizes are small except Ranganadi units.
1.3 Startup power requirement:For restoration of Generating Unit, startup power is required for its auxiliaries. The
requirement of Startup power of various units is as follow:-
Gas - 2 % of Unit Capacity
Hydro - 1 % of Unit Capacity
Startup power requirement for Gas Generating Unit is high as the major auxiliaries like
Gas Compressor, BFP, ID Fan, FD Fan, CW Pump etc. are of bigger size and the
starting torque is large. However, startup power requirement for Hydro Generating Unitis less because of few auxiliaries.
List of DG Set installed in the Generating Stations is atAnnexure-I
1.4 Synchronizing facilities at Power Stations / major Sub-Stations:
Synchronizing facilities play a vital role in building up of systems and also for inter-
connection of different sub-systems/islands. List of major Sub-Stations which have
synchronization facilities is indicated at Annexure-II.
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1.5 Shunt Reactors at major Power Station and Sub-Stations:
It is very essential to contain voltage during the restoration process of a collapsed
system. During the early restoration process, lines are generally lightly loaded due to
the restricted drawl by the drawing utilities and voltage starts rising up in different busesas system size grows. Shunt Reactors play a vital role to contain voltage. List of Shunt
Reactors available in NER is indicated in Annexure - III.
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Black start and Restoration Procedures of NER Grid
SYSTEM RESTORATION APPROACH2.1 ----- General Guidelines
2.2 ----- Initial Course of Action
2.3 ----- Important Considerations during Restoration
2.4 ----- Special Consideration in extending/availing start up power
2.5 ----- DONTS
CHAPTER 2
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Black start and Restoration Procedures of NER Grid
The following specific points must be adopted considering the importance of system
restoration:-
2.1 General Guidelines:i) This document should be available in the Control Room of each Load Despatch
Centre & readily accessible to all system operators.
ii) Black Start and Restoration Procedure of Regional Grid under various conditions
(Partial / Total Blackout) shall be reviewed /updated by NERLDC annually in
consultation with NLDC, all Users, STU, SLDC, CTU and NERPC Secretariat.
(As per Clause No 5.8(a) of IEGC)
iii) Black Start and Restoration Procedure of each system of Users/STU/CTU withina Region under various conditions (Partial / Total Blackout) will be finalized by
the concerned Users/STU/CTU in co-ordination with NERLDC. The procedure
will be reviewed, confirmed and/or revised once every year. Mock trial run of this
procedure for different sub-system shall be carried out by Users/STU/CTU at
least once in every six months under intimation of NERLDC. Diesel Generators
set for black start would be tested on weekly basis and test report shall be sent to
NERLDC on quarterly basis. (As per Clause No 5.8(b) of IEGC)
iv) List of essential loads with categories to be prepared by User/SLDC and sent to
NERLDC. Inter State/Inter Regional links, synchronizing points and essential
loads to be restored on priority shall be available with NLDC, RLDC & SLDC. (As
per Clause No 5.8(c) of IEGC)
v) NERLDC will co-ordinate entire restoration process through SLDC /ISGS
/POWERGRID etc.
vi) During restoration process, NERLDC is to be allowed to operate the Grid with
reduced security standard for voltage and frequency in order to achieve fastest
possible recovery. (As per Clause No 5.8(d) of IEGC)
vii) All communication channels required for voice communication during the
restoration process must be operational. At least one channel of voice
communication is to be kept free for NERLDC communication. (As per Clause No
5.8(e) of IEGC & As per Clause No 17 of CEA (Grid Standards) Regulation)
viii) Healthiness of communication system and ancillaries at all Load Despatch
Centres, Power Stations and Sub-Stations should be checked at least once in
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every week to ensure availability of communication system during the periods of
crisis.
ix) List of phone numbers(V-SAT, Landline, Mobile & ULDC) of Control Rooms of
all Load Despatch Centres, Power Stations and important Grid Sub-Stationsshould be available at all Control Rooms and to be distributed to all concerned.
Any change or addition of above phone numbers should be incorporated time to
time and to be communicated to all concerned.
x) Constituents should organize one day appreciation course on power system
restoration at regional level, at least once in a year for
a. Top Management Group/Chief of Load Despatch Centres
b. Load Despatch Personnel/Power System Operators/Sub-Station
Operators
xi) System Operators are expected to be thoroughly conversant with
a. Reactive Capability of Generators
b. Voltage Control through the following means :-
Charging the shorter line first
Switching off Capacitor Bank
Taking Bus Reactors into service
Charging Transformers and taking Bus Reactors into service
Converting Line Reactors into Bus Reactors wherever feasible.
Operating Generators at minimum Voltage levels
Changing Transformer Taps
Energisation of fewer High Voltage Lines.
c. Network connectivity by heart and
d. They should be able to converse fluently in Hindi/English
xii) Power Station which has Black Start capability should be tested at least once in a
month. Power Station which has DG Set should be explored for Black Start
Capability.
xiii) Synchronization facility wherever available should be checked periodically and
should be kept in working condition. Periodic report of non-functioning of
Synchronoscope is to be sent to NERLDC.
xiv) All equipment such as Disturbance Recorders and Event Loggers shall be kept in
healthy condition, so that under no condition such important data is lost. Periodic
report of non-functioning of Disturbance Recorder/Sequential Event Recorder to
be sent to NERLDC. (As per 15.4 of CEA Grid Standards Regulation)
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xv) Priority wise loads are to be secured in steps during restoration process. This is
to be documented by each User/SLDC and informed to NERLDC.
xvi) OLTC of Transformers shall be tested at least once in a week. Periodic report of
non-functioning of OLTC of Transformer to be sent to NERLDC.2.2 Initial Course of Action:
i) Assess (a) extent of black out, (b) whether any sub-system/island is alive or not,
(c) whether interconnection with Eastern Region is still there or not. If
interconnection with Eastern Region is there, then how much load can be
connected
ii) Appraise the severity of disturbance to all concerned.
iii) Open all circuit breakers at Power Station / Sub-Stations that have blacked out,to establish well defined starting point of restoration.
iv) Note the relay indications and reset them, if operated.
v) Check whether any equipment or any element has suffered damage or
developed a technical snag.
vi) Chalk out the optimum path for restoration after checking the grid elements that
were under outage before disturbance.
vii) Defer all planned outage as per IEGC 5.7.4 (g)
2.3 Important Considerations during Restoration:
i) Generating Stations which have black start facilities have to start up immediately.
ii) Availability of Generation Capacity in each island / sub system to be ensured.
iii) Availability of transmission lines in the interconnection between islands / sub
systems to be ensured.
iv) Load to be added in small steps with smaller and radial loads. Larger load may
be connected after consultation with NERLDC.
v) For developing island / sub system, special care should be taken to closely co-
ordinate the load pick-ups with the ramp rate of generation and to be ensured
that the frequency of the island is maintained within sustainable limit (around 50
Hz).
vi) If required, Governor and AVR of the units of the island are to be kept in manual
mode.
vii) UFRs are to be kept deactivated as frequency excursions at this stage may be
wider than normal condition. SPS are also to be kept deactivated.
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Black start and Restoration Procedures of NER Grid
viii) A reasonable active to reactive power ratio is to be maintained so that the
machine can be operated normally.
ix) Auxiliary power to be readily available so that machine can be operated normally.
x) Total auxiliary power drawn by the sub-system to be kept within 3% of thecapacity of the source.
xi) Before synchronization between two islands there should be proper co-ordination
for frequency adjustment.
xii) Risky synchronization shall be avoided as small island may not be able to survive
the jerk
xiii) While releasing loads, it is to be ascertained whether machines can supply the
power.
xiv) Tap Position of Transformer, Bus Voltage and Frequency at Power Stations and
Sub-Stations should be closely monitored to ensure that over fluxing does not
occur.
xv) Shift personnel should promptly formulate the strategy to be adopted in co-
ordination with NERLDC for quick restoration of the Grid.
xvi) The work of restoration in the Control Room should be shared & coordinated
among the shift personnel for smooth & quick restoration. Crisis Management
Group to be formed, consisting of expert personnel & called for early restoration
of the system.
xvii) Shift personnel should preferably be retained till restoration is over, before
handing over the charge to the next shift.
2.4 Special Consideration in extending/availing start up power:
I. Power Plant Operators should be able to differentiate between the followings :
a. Full auxiliary power needed to start all machines
b. Minimum auxiliary power needed to start a minimum number of
machines.
II. For availing start up power, the following considerations should be kept in mind :
a. Nearness to the source
b. 132 kV lines vis--vis 220 kV/ 400 kV lines
c. Shorter route having a number of intermediate sub-stations vis-a-vis
longer route having very few/ no intermediate sub-stations
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Black start and Restoration Procedures of NER Grid
III. For extending start up power from one sub-system to another sub-system or from
one utility to another utility, the following clear-cut authority should be given to
SLDC :-
a. Line through which start up power is to be extendedb. Quantum of such start up power
c. Normal time period admissible
IV. Concerned SLDC should also be empowered to resort to load shedding or
bring up additional generation wherever possible, to extend start up power
to neighboring sub-systems/utilities during the period of crisis.
2.5 DONTS:
i) Do not panic
ii) Do not load any Generator beyond 80% of its capacity
iii) Do not load any Line/ICT beyond 80% of its capacity
iv) Do not hastily connect loads and ensure that the island / sub-system frequency
be within sustainable range
v) Once power extended to a Power Station/Utility, it should not be withdrawn
except in case of extreme emergency and without intimation to NERLDC, as
actions taken up at Power Stations would have to be redone.
vi) No communication disputes should be raised during the restoration period.
vii) Till the restoration procedure is over, load despatch centers should not be
disturbed in undesirable manner while discharging their duties and they should
not be expected to function as Management Information System.
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Black start and Restoration Procedures of NER Grid
North Eastern Regional Load dispatch Centre, Shillong
Power Maps of NER3.1 ----- NER Network
3.2 ----- Assam Network
3.3 ----- Arunachal Pradesh Network
3.4 ----- Meghalaya Network
3.5 ----- Manipur Networh
3.6 ----- Mizoram Network
3.7 ----- Nagaland Network
3.8 ----- Tripura Network
CHAPTER 3
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9
WestBengal
3.1 POWER MAP OF NORTH EAST REGIONAL GRID
Chin
Along
Daporizo
BhutanRanganadi
Ziro
Naharlugan13
Dhemaji
Tinsukia
Dibrugarh
Doomdooma
Margherita
KhupiBhalukpong
NirjuliMajuli
Maran
Sibsagar
AGBPP
17
Bhutan
Birpara(ER)
Gelyphu(Bhutan)
Salakati
Motonga(Bhutan)
Rangia
Balipara
921
Gohpur
12 14
15 Mariani(PG)
Nazira
18
16
Mokokchung
Deomali
Binaguri(ER)
Gossaigaon
Gauripur
Bongaigaon
BTPS 2
1
BTPS (NTPC)
4
3
Kukurmara
5 7
Kahilipara6
8
Sarusajai 9
11
10Misa
SamaguriGolaghat
Bokajan
Doyang
WokhaKiphire
Rongkhon
Agia
Boko8
54
6 7
Langpi
Kopili Sankardevnagar
Diphu
Dimapur
Dimapur (S) Kohima
Meluri
NEEPCO (in MW)
Nangalbibra3
Mawngap
Nongstoin Mawlai
NEIGRIHMS
2 1Khleihriat(S) Khandong
Haflong Karong
Ranganadi - 3x135
Doyang - 3x25
Cherapunjee NEHU LeshkaKhleihriat
Haflong
AGBPP - 4x33.6+2x35+3xAGTPP - 4x21
BangladeshLumshnong
Dullavcherra
Badarpur
19 20
SrikonaPailapool
Jiribam
Imphal(S)
Imphal
Rengpang
Yaingangpokpi
Khandong - 2x25
Kopili - 4x50
Kopili St II - 2x25
Tripura
1. Dharmanagar
2. Kailashahar
3. Kamalpur
4. Dhalabil
Meghalaya
1. Umiam
2. Umiam St I3. Umiam St II
4. Umiam St III
Bangladesh 13
4 2AGTPP
Kolasib
Silchar
BairabiLoktak
Churachandpur
Kongba
Ningthonkhong
Kakching
Important Lines (in ckm)1. 400 kV Misa-Balipara D/C - 190
2. 400 kV Balipara-Bongaigaon D/C - 5803. 400 kV Balipara - Ranganadi D/C - 3324. 400 kV Bongaigaon - Binaguri D/C - 436
NHPC (in MW)
Loktak - 3x35
LEGEND
400 kV -5. Agartala6. Bodhjangnagar
5. Umiam St IV6. Umtru
8 95 6
710
KumarghatLuangmual 1. 220 kV Misa - Dimapur D/C - 247
220 kV -132 kV -
7. Jirania8. Baramura
9. Teliamura
10. Ambasa
11 Surjamaninagar
Assam
7. EPIP II (Norbong)
8. EPIP I (Raja)
9. Killing (Byrnihat)
11
Rokhia
Udaipur
Palatana
P.K. BariAizawl
Zuangtui
Serchhip
(Bukpui)
Saitual
2. 220 kV Misa - Mariani S/C - 220
3. 220 kV Misa- AGBPP S/C - 382.9
4. 220 kV Misa - Samaguri D/C - 68.8
5. 220 kV MIsa - Kopili T/C - 221.4
6. 220 kV Samaguri - Mariani S/C - 168
7. 220 kV Mariani - AGBPP S/C - 162.98. 220 kV Balipara - Samaguri S/C - 65
Hydro -
Thermal -
POWERGRID
NEEPCO
NHPC
1. Jogigopa2. Dhaligaon
3. Nalbari
4. Bornagar
5. Sipajhar
6. Sisugram
7. CTPS
8. Narengi9. Rowta
10. Baghjap
11. Depota
12. Pavoi
13.
NLakhimpur
14.- Bokaghat15. Jorhat
16.LTPS
17.NTPS
18. Mariani
19. Panchgram
20.
Panchgram(New)
BangladeshKhawiva
(Lunglei)
9 - 220 kV Sarusajai - Samaguri D/C - 247
10. 220 kV Bongaigaon - Salakati S/C - 1
11. 220 kV Salakati - BTPS D/C - 8
12. 220 kV Sarusajai - Langpi D/C - 216.4
AssamMeghalaya
Tripura
Others
11
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)
g
.2 POWER MAP OF ASSAM
Doomdooma
inaguri (PG)Gelyphu(Bhutan) Motonga
Khupi (NO)
North Lakhimpur
Ranganadi (NO)
Nirjuli (PG)
Gohpur
Dhemaji Tinsukia
Dibrugarh
Maran
Margherita
AGBPP (
NTPS
Birpara (PG)
Salakati (PG)
Bhutan (Bhutan) Balipara (PG)Ghoramari
Rowta
DepotaPavoi
MajuliLTPS
SibsagarNazira
Deomali (AP)
Gossaigaon
BTPS(NTPC
Bongaigaon (PG)
Dhaligaon
Bornagar Rangia
Nalbari
Sipajhar
Sisugram
CTPS
Bokakhat
SamaguriGolaghat
Jorhat (Garmur)
Mariani
MokokchungBTPS
AgiaGauripur
Jogigopa
Boko
KahiliparaBagjhap
Langpi
Misa (PG)
Sankardev Nagar
Bokajan
MeghalayaKukurmara
Sarusajai Kopili (NO)
Diphu Dimapur(NG)
NarengiKilling
(Byrnihat) (ME) Khandong (NO)Dimapur (PG)
Umtru (ME) Haflong
Khliehriat (PG)
Haflong (PG)
Lumshnong (ME)
Badarpur (PG)
BangladeshDullavcherra
TripuraPalatana (OTPC)
Dharmanagar (TR)
Kumarghat
Panchgram(old)
Panchgram(New
Srikona
Silchar
Kolasib (MI)
Pailapool
Jiribam (PG) Legend400 kV
220 kV
132 kV
66 kV
Gas
Hydro
12
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Bhutan
3.3 POWER MAP OF ARUNACHAL PRADESH
Legend400 kV220 kV132 kV
Hydro
Along
Daporizo
Ziro (PG)
Ranganadi
Bhalukpong
Khupi (NO)
Naharlagun
Nirjuli (PG)
AGBPP (NO)
Deomali
Balipara (PG)Gohpur (AS)
13
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Kahilipara (AS)
Sarusajai (AS)
Khandong(NO)
3.4 POWER MAP OF MEGHALAYA
1.Adhunik Cement
2.Hill Cement
3.JUD Cement4.GVIL Cement
10. Maithan11. Sai prakash12. Greystone13. Mega carbide
Kahilipara(AS)
5.CMCL
6.MCL7.Trishul8.Nalari
14. New Umtru
Agia (As)
Bongaigaon (PG)
AssamSarusajai (AS)
Kukurmara(AS)
EPIP II (Norbong)
8Misa (PG)
9. Shyam Century
Killing(Byrnihat) Umtru
7 13
1211 EPIP I (Raja Bagan)
Mendipathar14 9 10
Ampati Nongstoin
Umiam St IV
Umiam St IIUmiam St I
Umiam St III
Umiam
NEIGRIHMS
NEHU
Legend
400 kV
Rongkhon
(Tura)Nangalbibra
Mawngap
Sohra
(Cherapunjee)
Mawlai
Leshka
Khleihriat
Khleihriat (PG)1
Lumshnon2
34
6 5
220 kV132 kV Bangladesh
Silchar (PG)Panchgram (AS)Badarpur (PG)
14
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AizwalPG
3.5 POWER MAP OF MANIPUR
Dimapur (PG)
Kohima (NG)
Karong
Haflong
Badarpur (PG) Yaingangpokpi
Pailapool (AS)
Imphal
(PG) Yurembam
Jiribam
(PG)
Rengpang Kongba
Loktak (NH) Ningthoukhong
ChurachandpurKakching
Mizoram Legend132 kVHydro
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Tripura
Bangladesh
My
anmar
3.6 POWER MAP OF MIZORAM
Badarpur (PG)
Bairabi
Jiribam (PG)
Kolasib
Kumarghat
Vairengte Serlui-B
Luangmual
Aizwal (PG) Zuangtui
Saitual
Serchhip(Bukpui)
Khawiva
(Lunglei)
Lungse
Legend
132 kV
66 kV
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ArunachalPradesh3.7 POWER MAP OF NAGALAND
Mariani (AS)
Naginimara
TuliMon
Tizit
Mokokchung
Doyang (NO) Tuensang
Bokajan (AS)Dimapur (PG)
WokhaLikhimro
Misa (PG)1
Dimapur
Zunheboto
Kiphire
Chumukedima Meluri
GaneshnagarKohima
Karong (MA)
Imphal (PG)Legend
220 kV
132 kV66 kV
Hydro
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Aizwal(PG)
M
izoram
3.8 POWER MAP OF TRIPURA
Dullavcherra (AS)
Dharmanagar
Badarpur (PG)
Silchar
Kailashahar
KamalpurP K Bari
Kumarghat
JiraniaBodhjangnagar
Dhalabil
(Khowai)
Ambasa
Agartala AGTPP (NO)Teliamura
(Gamaitila
Badarghat Baramura
Rokhia
Surjamaninagar
Gokulnagar
Udaipur
Palatana
(OTPC)
Sonamura
(Rabindranagar)
Amarpur
Gumti
Bagafa
Belonia
Sabroom
Satchand Legend
400 kV
132 kV66 kV
Gas
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Black start and Restoration Procedures of NER Grid
Network Diagram of NER4.1 ----- NER Network
4.2 ----- Assam Network
4.3 ----- Arunachal Pradesh Network
4.4 ----- Meghalaya Network
4.5 ----- Manipur Networh
4.6 ----- Mizoram Network
4.7 ----- Nagaland Network
4.8 ----- Tripura Network
CHAPTER 4
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37
63
3
25
92
69
13
118
15
4
18
12
37
28
41
4
9
12
41
46
35
7
18
10 3
126
217
160km
50
2 .23
28 8
30
24
7
1
57
106
72 6
0 45
10
7
73
12
11
34
65
76
2x315
95
15
4x25
45
67
101
124
63
50
1
50
65
26
89
35
39
20
169
1
26
36
53
13
2
80
22
42
60
50
58
40
50
53
42
4.1Network D iagram of Nor th Eastern Regional Gri dRanganadi(NO)
Bongaigaon(PG) 50
2x80+2x50 50 290298 30 % 63
Balipara (PG)
50 16650 2x360
3x135
Ziro(PG Daporizo
New Siliguri(ER) 224 63Motonga (Bhutan)
Rangia(AS)Bhalukpong(AR) 63
42 Nirjuli(PG) 4 1820 (AR) A
(
New Siliguri(ER)218
63 63
315 106
Nalbari (AS)
22
Sipajhar(AS)49
38 44
Khupi(NO) 22
72
45
282x50
31550+80 N. Lakhimpur
(AS) Naharlagun(AR)
45
AGBPP(NO
87 82
Pasigh
Birpara(ER)
160 Dhaligaon42 Bornagar(AS 34
27
108 64Rowta(AS) Depota(AS)
9
Tezpur(AS)
4x25 Dhemaji(AS)
1x10019 )
4x33.6+2x35
(AR)
Roing
Salakati(PG Gaupur 63(AS)
AMP(AS)37
Sisugram(AS) CTPS(AS)
Gohpur(AS) Majuli
222220
Deomali(AR161 (PG)
Gelephu(Bh) 2x50 Gossaigaon(AS) 64 1 BRPL Narengi(AS)20 2x30 Pavoi (AS)
168 163 24 Tez
49 3
22 Kukurmara(A
KaheliparaAS)12
3 2935 5
Dispur(AS) Jagirod (AS)
HPC,J
Sankardev
Nagar
51 77
2x12.5
168
2x12.
Mariani
2x100
20Mariani
New
(PG) Tinsukia
(PG
Nam(PG
BTPS(NTPC)
3x250 MW
Azara (AS) 1x315 803
Boko (AS)
63
3x100
Sarusajai(AS)108
Langpi(AS)
2x50130
Diphu
(AS)
3x50
50Samaguri (AS)
(AS)
Jorhat
(AS)
LTPS(AS)
4x15+3x30+
1x37.2
(AS)
2x50
BTPS .4 Trishul .3 Shyam Century Bokakhat
(AS) 1 .1EPIP II 3Nalari
.4 Maithan
4.4
(AS)45 69
1x50 1x50
2x80+1x1661
2x50Umtru(ME)
4x2.8
30
(ME)
167
EPIP I(ME)
2x160
Sai Prakash.7 Greystone
1Mega Carbide
113
Misa(PG) Golaghat(AS)
Nazira(AS)
2x50
2x25+
NTPS(AS)3x23+1x12.5+
1x30+1x22
Agia
(AS) 70Umiam IV(ME)
8
2x30 10Umiam St III(ME)
2x30 2x31563
Byrnihat(ME) Leshka(ME)3x42
Kopili(NO)Bokajan
(AS)Moran(AS)
Sibsagar(AS)
1x20
43
131 Umiam II(ME) 3 Umiam St I(ME)Umiam(ME) 50 Khliehriat8 26 Kopili StII(NO) 4x50 Ledo(AS)
Palatana
2x9Tura (ME)
Mawngap 33(ME)
4x953
5 7
(ME)
63
5
Khliehriat(PG)
1x251x60+1x160
Khandong(NO)
2x363
80 57
Nangalbibra(ME)
2354
Nongstoin(ME)
Mawlai(ME)
9
NEHU(ME) NEIGRIHMS(ME)
Adhunik Cement
Hill Cement42
JUD Cement
Lumshnong41
2x25
Haflong (PG)63 1
Dibrugarh(AS)
1x125 63
Udaipur(TR)
6 40
Rokhia(TR)6x8+2x21
1x30
Cherapunjee(ME)
Dharmanagar
35 (TR)
Dullavcherra(AS)29
63
(ME)
GVIL Cement
CMCL
77
23 1
219
Badarpur (PG)
Haflong (AS)
Dimapur(PG)
Doyang (NO)
933x25
Mokokc
(PG
247
18 Agartala(TR
)
2x2
45 Dhalabil
50
Kailashor
MCL
63 HPC,P
Panchgram(AS)
19140
2x10027
30Wokha58 (NG)
2x
1
Badarghat3
(TR)
18
AGTPP(NO)8
Kamalpur
(TR) 3231
(TR)(TR
) 2x632x200
1
Srikona(AS)35
Pailapool
(AS)
Dimapur(NG) Kohima
(NG)
Mokokchung(NG)
74
2x100+2x54x21
130
1041
Silchar (PG)
20119
Bairabi(MZ)4x5.7
30
Kolasib(MZ)
Imphal(PG)
20 60Karong(MA)
Kh
36 (
Surajmani Nagar(TR)
Legend
18 Bodhjangnagar(TR)8
2x10
P K Bari(TR)
Kumarghat(PG)
133 Aizawl(PG) 66
172
Jiribam(MA)
Jiribam
Imphal
(MA) Likhimro(NG) 3x8
Ka
400 kV 220 kV
132 kV 66 kV
Line Length in km
7
Jirania(TR)
14 25 45 Melriat
5
Sinhmui(MZ)
20 1
Longmol(MZ)
Rengpang(MA) 40
Saitual(MZ)
(PG)82
42
Yaingangpokpi
(MA)33
23
45
Kongba
(M
Reactor/Capacitor Capacity in MVAR
Transformer Capacity in MVA
30Baramura(TR) Teliamura Ambasa Melriat
(New) (PG)W. Phaileng
Zungtui(MZ)
50
54 69 Loktak(NH) Ningthoukhong Churacha(MA
Installed Capacity in MW 2x5+1x6.5+2x21 (TR) (TR)(Mz) 30 (MZ) Serchip(MZ) Lunglei(MZ) 3x35
11 (MA)
20
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70
1
31
13
63
64
118
259
50
30
126
.2
44
18
1
8
34
113
12
46
73
76
12
11
44
57
5
101
106
43
72
51
60
65
64
39 8
89
20
45
26
50
54
53
22
60
13
39
80
25
36
43
3
53
5 3
NETWORK DIAGRAM OF ASSAM GRID
Bongaigaon(PG) 63
224 63 50
298
290
30% 63Balipara (PG) 73
63 Kameng(NO)
w Siliguri
(ER)
irpara
21863
167
63
63
Killing 2x16
2x25 Rangia
2x16
Khupi 67(NO)
72 2864
2x50
9
315 50
2x10 1x16.5
166
57
50
132x200
Ranganadi(NO)
Pavoi
AGBPP((ER) 160 315 Nalbari Motonga 49 Biswanath Chariali (PG) Itanagar (AR) 4x33.6+2
Salakati2x25
2x50+80
Gauripur
2x16
106
42
22
86
Bornagar
38 Sipajhar
27
Depota2x31.5
Tezpur
Nirjuli(PG)
4x25
77
50+80 N.
45
383
Majuli
63
Dhemaji
2x16
+ 3x319
Deom25
2x50 Gossaigaon .6 BRPL 2x25108 Gohpur 220 163
lyphu 3hutan) 49 3
63
2x16
22
37
DhaligaonAPM
Rowta
2x25 1x16+1x10
Biswanath Charali
168168
2x12.5
2x100 Mariani1x20MV 1x16
20
Mariani New(PG) 3x10
Doomdooma(Rupai)
Tins
2
BTPS BTPS2x80+1x1601x16
2x25 1x12.5+1x16
Sisugram2x25
Narengi 1x16+1x30CTPS2x30
(Pavoi)
452x12.5
MVA
80Mokokchung
NTPC)
x250 Agia 1x315
Kukurmara
632x31.5+1x40 12 20 2x16 3x50
2x25+
1x16
(PG)
LTPS
3x20
1x50
1x40+1x12.5
3
Azara
2x50
Kahilipara
2x10
3 29
Dispur
1x31.5+2x30 2x16
35
2x16
Baghjhap
Samaguri
2x25Sankardev
Jorhat(Garmur
2x16Mokokchung
(NG)69
4x15+3x30+
1x37.2
2x7.5
3x20
2x10
Boko61
1x50
2x40
Sarusajai
3x100
3x31.5
Umtru(ME)
Umtru130
108
Langpi
2x50
34
5050
HPC,J Nagar
(Lanka)
Diphu
2x16
2x5
95
2x16Bokakhat
Golaghat
2x25
1x20+1x10
1x16
3x5
40
Bokajan
2x25
Nazira(Gargaon)
2x25
2x25
Sibsagar
2x16
2x50
1x31.5
2x25+
1x20
1x10
36
2x31
Dibrugarh
NTP
3x23+1x
+1x30+
FCI
50Killing(ME) Misa(PG)
2x315 4x25
124
50
Dimapur(PG)
Dimapur(PG)
Dimapur(NG)
Moran
2x16
74
217
42
Khliehriat 41(PG) 77
Panchgram
63 2x16
Kopili(NO)4x50
Kopili StII (NO)
1x25
119
1x60+1x160
Khandong(NO)
63
107
Badarpur (PG)67
Kolasib(MZ)
Haflong(PG)
12x10
Haflong
63
Silchar (PG)
Lumshnong (ME)
2x63
232
HPC,P
140
2x10
Panchgram
119
Imphal(New)
Kumarghat(PG)
atana (OTPC)247
63 50
160
2x200 191
Srikona Pailapool35
(PG)
15
Legend
400 kV 220 kV
Melriat (PG)
29Dharmanagar (TR)
Dullavcherra
1x3.5
P K Bari
(TR)2x25
3x10 Jiribam(PG)
1x20 132 kV 66 kV
Line Length in km
Reactor/Capacitor Capacity in MVAR
Transformer Capacity in MVA
Installed Capacity in MW21
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n
1
18
Legend
400 kV
220 kV
132 kV
66 k 33 kV
Length in km
tor/Capacitor Capacity in MVAR
nsformer Capacity in MVA
alled Capacity in MW
AGBPP(NO)4x33.66+2x35.01+3x30
Note : 1. For the sake of continuity of the Network, Lines & Buses owned by others shown
2. 400 kV Lines owned by POWERGRID
3 NETWORK DIAGRAM OF ARUNACHAL PRADESH GRID
Khupi(NO)
Bongaigao(PG)
Bhalukpong
30 %
298
290
2x50
63
63
2x315
Balipara(PG)
50+80
Biswanath
Chariali
166
50
2x360
Ranganadi(NO)3x105
45
Ziro(PG)
Daporizo Along
87 82
Pasighat
52
Roing
35
Kimi(NO)
8
1x16Tezpur
(AS)
9
164 4x25 50+8
(PG)
1x20+1x15
Naharlagun
Pare(NO)2x55
1x15 2x5 1x15
20 2x15
Tezu
Kameng (NO)
Samaguri(AS) 63
304
Gohpur(AS)
43 4
4x150 73
Lower Subansiri (NH)8x250
2x20
2x10 Nirjuli(PG)
Itanagar(AP)
Namsai
2x15
Miao
Jairampur
Deomali
19
2x16
Khonsa Changlang
1x100
22
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46
37
9
30
41
9
113
18
.4 .1
.2
.2 82
2 30 3
.7km
.4
1km
.3
26
4.4 NETWORK DIAGRAM OF MEGHALAYA GRID
Misa(PG) Bongaigaon(PG)
Sarusajai(AS)
Kahilipara(AS)
New Umtru2x40 2x160
2
Killing
10
16750
217
63
Silchar(PG)
3
3
Maithan
4
Shyam Ce
Sai Praka
Mendipathar
Agia(AS)
3
Umtru4x2.8
Umiam St IV2x30
1
41
8
10
17
Umiam St II 32x9 12
EPIP II (Norbong)
2x20
Trishul
Umiam St III2x30
Nalari
1x50+2x
Greystone
EPIP I
MegaCarbide
17 69
1x12.5
57 71Mawlai
3x20
Umiam
7
5
2x20
Umiam St I
4x9
532x20
Ampati Rongkhon(Tura)
1x20+4x5
Nangalbibra
2x12.5
Nongstoin 3
Mawngap 2 NEHU
7
NEIGRIHMS
Khliehriat63
8
Legend
1x40
1x12.5
2x20 2x10
Sohra
(Cherapunjee
Hill Cement
AdhunikCement
24
JUD Cement
5
Khliehriat(PG)
Leshka
3x42400 kV
220 kV
132 kV
33 kV
Under const
Lumshnong
2x5 MPL
GVIL CMCLCement
MCL
Under long outage
ine Length in km
eactor/Capacitor Capacity in MVAR
ransformer Capacity in MVA
nstalled Capacity in MW
Panchgram(AS)
23
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101
1
35
22
11
26
60
50
Legend400 kV
132 kV 33 kV
Length in km
ctor/Capacitor Capacity in MVAR
nsformer Capacity in MVA
alled Capacity in MW
Note : 1. For the sake of continuity of the Network, Lines & Buses owned by others shown
5 NETWORK DIAGRAM OF MANIPUR GRID
Kohima(NG)
Karong
Haflong(PG) Imphal
2x20
Yaingangpokpi Kongba Kakching
Badarpur (PG) 67Jiribam
Imphal (PG)42 33 45
Pailapool (AS) 15
(MA)
Jiribam
2x50
20
3x20
23
1x20 2x20
38
Aizwal(PG) 172
1x20
(PG)
40
1x12.5
Rengpang42
Ningthoukhong
2x12.5
1x20
Churachandpur
82
Loktak(NH)
24
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7
107
30
1x12.5+1x6.3Legend
33 kV
66 kV
132 kV 400 k
Line Length in km
Reactor/Capacitor Capacity in MVAR
Transformer Capacity in MVA
Installed Capacity in MW
4.6 NETWORK DIAGRAM OF MIZORAM GRID
Badarpur(PG)
Kumarghat(PG)
Aizawl
(PG)
133
20
66
172
1
1x6.3
1x12.5
Jiribam
(PG)
2x12.5 160
Bairabi
1x12.5
Kolasib(Bawktlang)
Silchar
(PG)
W Phaileng Sinhmui
Luangmual
50
Melriat
Saitual
2x50Melriat
5 54 1x6.3 55
ZuangtuiBukpui Khawiva
2x12.5 2x12.5 (Lunglei)
25
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3
124
169
2
5
1
26
8
50
58
27
36
56
50
4.7 NETWORK DIAGRAM OF NAGALAND GRID
Misa (PG) Bokajan(AS)
Mokokchung (PG)2x50 53
Mariani(POWERGRID)
Dimapur
Doyang (NO)3x25
93 30
1 50
1x25
Mokokchung
Mariani(AS)Tul Nagnimora
(PG)57 34 Tizit Mon
Wokha
1x7.5 46 44 31
Imphal(PG)
Dimapur
3x20
4
Kohima
1x5
74
Meluri
Zunheboto
Kiphire42
Tuensang
1x5
1x7.5 1x5 1x5 1x5
3x8 1x12 3x10
Singrijan Karong(MA)
Legend
33 kV
66 kV
132 kV 220 kV
Line Length in km
Ganesh
Nagar 1x10
Power House2
Chumukidima
1x10
2x10MVA
Nito Farm
Likhimro3x8
Reactor/Capacitor Capacity in MVAR
Transformer Capacity in MVA
12
3 1x5 1x5
Installed Capacity in MWBokajan(AS) Dairy Farm
26
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4.8 NETWORK DIAGRAM OF TRIPURA GRID
22
Silchar 1x4 SonamuraSatchand
2x10 2x15 (Rabindranagar)
5012 Gakulnagar Bagafa
1x4Sabroom
Badarghat 1x15 2x515 1x10
1x15 Belonia
80 251x5+1x10
1x10 Dharmanagar63 24 (Mission Tilla)
233x7.5/2.5/5
Palatana(OTPC)Udaipur 29 Dullavcherra
2x363 1x125 (Banduar) 1x10 (AS)
1x15+2x1 Rokhia 1x30 1x8+2x21 2x2 Kailashar6 40 6x8+2x21 (Gournagar)
3518 2x7.5/2.5/5
1x1
1x15+1x1 3x25+2x20Dhalabil(Khowai) Kumarghat
4518 Agartala
AGTPP(NO) 8(79 Tilla) Badarpur
45 Surajmani Nagar 4x21Kamalpur 119
1x1031 1 Aizawl
1x10 2x100+2x50 104 131
133 20
Gumti 2x1003x5 Bodhjangnagar 126
18 8P K Bari
1x4 1x15 Silchar
Monarchak (NO) Amarpur 2x257 Jirania
1x104 2x10
Legend
400 kV
132 kV
66 kV
33 kV
Line Length in km
Reactor/Capacitor Capacity in MVAR
Transformer Capacity in MVA
Installed Capacity in MW
35
3
247
37
45
25
3
24
31
15
40
30
32
35
4
5
15
18
2x6.3
Baramura 1x3012 25
2x5+1x6.5+2x21 Teliamura
1x15 1x7.5/2.5/5
1x7.5
Ambasa
Teliamura(Gamaitilla) 1x6.3+1x4
27
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Broad classif ication of North Eastern
Regional Grid5.1 ----- 400 / 220 kV Network of POWERGRID
5.2 ----- 220 / 132 kV Network of Assam System
5.3 ----- 220 / 132 kV Network of Arunachal Pradesh System
5.4 ----- 400 / 220 / 132 kV Network comprising of Nagaland, Manipur,
South Assam, Mizoram, Tripura, Meghalaya, POWERGRID andNETC (North East Transmission Company)
CHAPTER 5
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North Eastern Region (NER) comprises of seven states viz Arunachal Pradesh, Assam,
Manipur, Meghalaya, Mizoram, Nagaland & Tripura. NHPC NEEPCO & OTPCL are
the Central Generating Companies presently operating in the region with installed
capacity of 105 MW,1130 MW & 363 MW respectively.Depending on the network connectivity, NER Grid is broadly classified as
follows.
a) 400 / 220 kV Network of POWERGRID
b) 220 / 132 kV Network of Assam System
c) 220 / 132 kV Network of Arunachal Pradesh System
d) 400 / 220 / 132 kV Network comprising of Nagaland, Manipur,
South Assam, Mizoram, Tripura, Meghalaya,POWERGRID andNETC (North East Transmission Company).
5.1 400 / 220 kV Network of POWERGRID:
This is the main back-bone network of NER Grid comprising of 400 kV and 220 kV
transmission lines of POWERGRID (PG). NER Grid is connected to ER Grid through
this network. The network configuration is described as below:
a. 400 kV Bongaigaon (PG) Sub-Station of NER is connected with 400 kV NewSiliguri (PG) Sub-Station of ER through 400 kV D/C New SiliguriBongaigaon
lines.
b. 220 kV Salakati (PG) Sub-Station of NER is connected to 220 kV Birpara (PG)
Sub-Station of ER through 220 kV D/C BirparaSalakati lines. 220 kV Salakati
Sub-Station and 400 kV Bongaigaon Sub-Station are connected through 315
MVA ICT.
c. Bongaigaon (PG) Sub-Station is connected to Balipara (PG) Sub-Stationthrough 400 kV D/C BongaigaonBalipara lines.
d. 400 kV D/C BaliparaMisa lines and 400 kV D/C Balipara Ranganadi lines
connect Balipara (PG) Sub-Station with Misa (PG) Sub-Station and Ranganadi
(NEEPCO) Power Station respectively. 400 kV Bus of Misa is connected to 220
kV Bus through 315 MVA ICT.
e. Misa (PG) Sub-Station is connected with Kopili (NEEPCO) Power Station,
Dimapur (PG) Sub-Station and AGBPP (NEEPCO) through 220 kV T/C Misa
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Kopili lines, 220 kV D/C Misa Dimapur lines and 400 kV S/C Misa
Kathalguri line (charged at 220 kV) respectively.
f. Misa (PG) Sub-Station is also connected to Mariani (Assam) Sub-Station and
Samaguri (Assam) Sub-Station through 220 kV S/C Misa Mariani line and220 kV D/C MisaSamaguri line.
g. Misa (PG) Sub-Station is connected with Killing (Byrnihat) Sub-Station of
Meghalaya through 220 kV D/C MisaKilling lines.
h. Mariani Sub-Station is connected to AGBPP (NEEPCO) through 400 kV S/C
MarianiKathalguri line (charged at 220 kV)
5.2 220 / 132 kV Network of Assam System:
Assam has its own 220 kV & 132 kV Network through which it is connected to the Main
Grid. Except South Assam, connectivity of Assam system with the Main Grid is better
than other states connectivity to the Main Grid. Connectivity of Assam system with the
Grid is as follows:-
a. BTPS (Assam) Sub-Station is connected with Salakati (PG) Sub-Station
through 220 kV D/C BTPS Salakati lines. Again, 220 kV Bus of BTPS is
connected to 132 Bus through 2 X 80MVA + 1 X 160 MVA.
b. Dhaligaon, Barnagar, Nalbari, Rangia, Rowta, Sipajhar , Sisugram and Depota
Sub-Stations are connected with BTPS, Kahilipara, Pavoi, Samaguri and
Balipara (PG) Sub-Stations through 132 kV lines. 220 kV Bus of Samaguri Sub-
Station is connected to 132 kV Bus through 3 X 50 MVA ICT. Again, Samaguri
Sub-station is connected with Balipara (PG) Sub-station through 220 kV
SamaguriBalipara S/C line.
c. Agia Sub-Station is connected with BTPS Sub-Station through 220 kV D/C
BTPS Agia lines. Presently, one circuit of 220 kV BTPS Agia is under
outage.
d. Sarusajai Sub-Station is connected with Agia Sub-Station through AgiaBoko-
Sarusajai line and AgiaSarusajai respectively.
e. Sarusajai Sub-Station is connected with Samaguri Sub-Station,Jahawar
Nagar(GIS) Sub-Station and Langpi Power Station through 220 kV Sarusajai
Jahawar Nagar- Samaguri I and 220 kV Sarusajai Samaguri II lines and
220 kV D/C SarusajaiLangpi lines respectively.
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f. Kahilipara Sub-Station is connected with Sarusajai Sub-Station through four
numbers of 132 kV Sarusajai Kahilipara lines & with Rangia Sub-Station
through 132 kV Kahilipara Sishugram - Rangia & 132 kV S/C Kahilipara
Rangia lines.g. LTPS, NTPS, Tinsukia and Dibrugarh Sub-System is connected with Mariani
Sub-Station and AGBPP through 132 kV S/C LTPS - Mariani and 220 kV D/C
TinsukiaAGBPP lines respectively.
h. Mariani, Golaghat and Bokajan Sub-Stations are connected with Dimapur (PG)
Sub-Station through 132 kV S/C MarianiGolaghat - Bokajan - Dimapur line.
i. Gohpur, Pavoi (Bishwanath Chariali), North Lakhimpur, Dhemaji and Majuli
Sub-Stations are connected with Nirjuli (PG) Sub-Station through 132 kV S/C
Nirjuli Gohpur line. Gohpur, Pavoi (Bishwanath Chariali), North Lakhimpur,
Dhemaji and Majuli Sub-Stations are also connected with Balipara (PG) Sub-
Station through 132 kV Balipara Gohpur line and with Samaguri and Depota
Sub-Stations through 132 kV Samaguri Depota Pavoi line (T-connection
near Depota in between Depota & Pavoi).
5.3 220 / 132 kV Network of Arunachal Pradesh System:
The connectivity of 220 kV & 132 kV Network of Arunachal Pradesh is as follow:-
a) Ziro(PG), Daporizo and Along Sub-Stations are connected with Ranganadi
(NEEPCO) Power Station through 132 kV S/C RanganadiZiro line.
b) Nirjuli (PG) Sub-Station is connected with Ranganadi (NEEPCO) Power Station
& SMS Sub-Station of Arunachal through 132 kV S/C Ranganadi SMS -
Nirjuli line (T Connection at SMS) and also with Gohpur Sub-Station of Assam
through 132 kV S/C NirjuliGohpur line.
c) Itanagar Sub-Station is connected with 132 kV Nirjuli (PG) Sub-Station through
four nos. 33 kV feeders. Again, Itanagar can draw power from SMS Sub-station
via Naharlagun Sub-station through 132 kV SMS Naharlagun-Itanagar line
(Presently charged at 33 kV).
d) Khupi, Kimi Sub-Stations are connected with Balipara (PG) Sub-Station
through 132 kV S/C BaliparaKhupi - Kimi line and Deomali is connected with
AGBPP (NEEPCO) through 220 kV S/C AGBPPDeomali line respectively.
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North Eastern Regional Load dispatch Centre, Shillong
5.4400 / 220 / 132 kV Network comprising of Nagaland, Manipur, SouthAssam, Mizoram, Tripura, Meghalaya,POWERGRID and NETC (North
East Transmission Company :The connectivity of 132 kV Network comprising of Nagaland, Manipur, South Assam,
Mizoram, Tripura and Meghalaya is as follow:-
1. Nagaland System is connected with the Main Grid through:-
a) 132 kV D/C Dimapur (PG)Dimapur line.
b) 132 kV S/C Dimapur (PG)Kohima line (presently under outage).
c) 132 kV S/C Karong (Manipur)Kohima line.
d) 132 kV S/C Doyang (NEEPCO) - Mokokchung line.
e) 132 kV S/C Mariani (Assam) Mokokchung line (presently under
outage)..
f) 66 kV S/C DimapurBokajan (Assam) line
** Nagaland is also co nnected with As sam sy stem throu gh the fol lowing 33
kV and 11 kV feeders :
i) GargaonNaginimara
ii)SonariTigit
iii)Chanki - Moriani
2. Manipur System is connected with the Main Grid through :-a) 132 kV D/C Imphal (PG)Imphal lines.
b) 132 kV S/C Imphal (PG)Ningthoukhong line.
c) 132 kV S/C Kohima (Nagaland)Karong line.
d) 132 kV S/C Loktak (NHPC)Ningthoukhong line.
e) 132 kV S/C Loktak (NHPC)Rengpang line.
f) 132/33 kV, 1 X 20 MVA Transformer at Jiribam (PG) Sub-Station
3. Mizoram System is connected with the Main Grid through :-a) 132 kV S/C Aizawl (PG)Zuangtui line.
b) 132 kV S/C Aizawl (PG)Laungmual line.
c) 132 kV S/C Badarpur (PG)Kolasib line.
d) 132 kV S/C Aizawl (PG)Kolasib line.
4. Tripura System is connected with the Main Grid through :-
a) 132 kV D/C AGTPP (NEEPCO)Agartala lines
b) 132 kV S/C Kumarghat (PG)P K Bari line
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c) 132 kV S/C Dullavcherra (Assam)Dharmanagar (Missiontila) line
d) 132 kV S/C PalatanaSurjyamani Nagar line
e) 132 kV S/C PalatanaUdaipur line
5. South Assam is connected with the Main Grid through :-a) 132 kV S/C Badarpur(PG)Panchgram line.
b) 132 kV S/C Lumshnong (Meghalaya)Panchgram line
c) 132 kV S/C Dharmanagar (Tripura)Dullavcherra line.
d) 132 kV S/C Jiribam (PG)Pailapool line.
e) 132 kV S/C Haflong (PG)Haflong line.
f) 132 kV S/C Silchar Dullavcherra line.
g) 132 kV S/C SilcharPanchgram line.
h) 132 kV D/C SilcharSrikona lines.
i) 33 kV S/C Khandong (NEEPCO)Umrangshu line.
6. Meghalaya system is connected with the Main Grid through :-
a) 220 kV D/C MisaKilling (Byrnihat) lines.
b) 132 kV D/C Khliehriat(PG)Khliehriat lines.
c) 132 kV S/C Panchgram(Assam)Lumshnong line.
d) 132 kV Agia (Assam)Nangalbibra line.
e) 132 kV D/C Kahilipara(Assam) - Umtru lines.
f) 132 kV D/C Sarusajai (Assam)Umtru lines.
7. The connectivity of the 132 kV System with 400 kV & 220 kV System
& major connectivity of intra 132 kV System:-
a. Dimapur (PG) Sub-Station is connected with Misa (PG) Sub-Station through
220 kV D/C MisaDimapur lines. 220 kV Bus of Dimapur (PG) Sub-Station
is connected to 132 kV Bus through 2X100 MVA ICT.
b. Dimapur (PG) Sub-Station is connected with Imphal (PG) Sub-Station
through 132 kV S/C DimapurImphal line.
c. Imphal (PG) Sub-Station is connected with Loktak (NHPC) Power Station
through 132 kV S/C ImphalLoktak line.
d. Loktak (NHPC) Power Station is connected with Jiribam (PG) Sub-Station
through 132 kV S/C LoktakJiribam line.
e. Jiribam (PG) Sub-Station is connected with Haflong (PG) Sub-Station,
Badarpur (PG) Sub-Station and Aizawl (PG) Sub-Station through 132 kV
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S/C JiribamHaflong line, 132 kV S/C JiribamBadarpur line and 132 kV
S/C JiribamAizawl line respectively.
f. Khandong (NEEPCO) Power Station is connected with Kopili (NEEPCO)
Power Station through 132 kV D/C Kopili Khandong lines. 220 kV Bus ofKopili Power Station is connected to 132 kV Bus through 1X160 MVA ICT.
g. Khandong (NEEPCO) Power Station is connected with Khliehriat (PG) Sub-
Station and Haflong (PG) Sub-Station through 132 kV D/C Khandong
Khliehriat lines and 132 kV S/C KhandongHaflong line respectively.
h. Badarpur (PG) Sub-Station is connected with Khliehriat (PG) Sub-Station ,
Kumarghat (PG) Sub-Station, Jiribam (PG) Sub-Station and Aizawal (PG)
Sub-Station through 132 kV S/C Khliehriat Badarpur line, 132 kV S/C
KumarghatBadarpur line, 132 kV S/C BadarpurJiribam line and 132 kV
S/C BadarpurKolasib - Aizawl lines respectively.
i. Again, Badarpur (PG) Sub-Station is connected with Silchar (PG) Sub-
Station through 132 kV (D/C) BadarpurSilchar lines.
j. 132 kV bus of Silchar Sub-Station is connected with 400 kV bus through
400 / 132 kV, 2 x 200 MVA ICT.
k. Silchar Sub-Station is connected with Palatana Power station through 400
kV D/C SilcharPalatana lines. Palatana Power station is also connected
with Tripura system through 132 kV PalatanaUdaipur & 132 kV Palatana
Surjyamani Nagar lines respectively.
l. Again, Silchar Sub-Station is connected with Killing (Byrnihat) sub-stationthrough 400 kV S/C Silchar Byrnihat line. 400 kV bus of Byrnihat Sub-Station is connected to 220 kV bus through 2 x 315 MVA ICT.
m. Kumarghat (PG) Sub-Station is connected with AGTPP (NEEPCO) and
Aizawl (PG) Sub-Station through 132 kV S/C KumarghatAGTPP line and
132 kV S/C KumargahtAizawl line respectively.
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Black Start & Restoration Procedures6.1 ----- Restoration of NER Grid after total collapse, when power from
ER is available
6.2 ----- Restoration of NER Grid after total collapse, when power from
Eastern Region (ER) is not available
6.3 ----- Restoration of 400 / 132 kV Network comprising of Manipur,
South Assam, Mizoram, Tripura, AGTPP and Palatana afterpartial collapse.
6.4 ----- Restoration of 132 kV Network comprising of Manipur (except
Jiribam) and Loktak, after partial collapse.
CHAPTER 6
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This Chapter explains broad guidelines for restoring the system after black out. The
procedure is split up for the following scenarios:-
1. Restoration of NER Grid after total collapse, when power from Eastern Region
(ER) is available2. Restoration of NER Grid after total collapse, when power from Eastern Region
(ER) is not available
3. Restoration of 400 / 132 kV Network comprising of Manipur, South Assam,
Mizoram, Tripura, AGTPP and Palatana after partial collapse.
4. Restoration of 132 kV Network comprising of Manipur (except Jiribam) and Loktak,
after partial collapse.
NER Grid under above scenarios will be restored after building up of some sub-systems /
islands on the basis of available resources. Source of start up power is to be identified
whether it is available within sub-system / island or outside the sub-system / island for early
restoration. The following procedure is to be adopted for restoration of affected system:-
I. Source of startup power
II. Identifying the critical / essential loads of each sub-system / island
III. Points of synchronization with other sub-system / island
IV. Action to be taken by various Generating Stations and Sub-Stations.
6.1 Restoration of NER Grid after total collapse, when power from ER is
available
For restoration of NER Grid from total collapse condition, a multi-pronged restoration
strategy is envisaged in which some sub-systems and islands are to be built up
simultaneously by utilizing power from Eastern Region (ER) and black start facilities
available in various Power Stations in North Eastern Region.
For restoration of NER Grid from total collapse condition, the following sub-systems /
islands are to be built up in parallel:-
6.1.1 The system, consisting of the following sub-systems are to be built up in
parallel, by utilizing power from ER
SUB SYSTEM#1:a. Main network comprising of Bongaigaon(PG), Salakati(PG),
Gelephu(PG),Balipara(PG),Ranganadi(NEEPCO) ,Nirjuli(PG), Misa(PG),
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AGBPP(NEEPCO), Dimapur(PG), Doyang(NEEPCO), Byrnihat(MeECL),
Kopili(NEEPCO),Khandong(NEEPCO),Khliehriat(PG),Haflong(PG),
Badarpur(PG), Silchar (PG) and Palatana(OTPC).
b. Arunachal Pradeshcomprising of Khupi, Kimi, Ziro, Itanagar andDeomali,c. Central Assam comprising of Gohpur, Depota, Pavoi, Depota, Rowta,
Dhemaji, North Lakhimpur, Majuli, Samaguri, Mariani
d. South Assam comprising of Panchgram, Dullavcherra Srikona and
Pailapool
e. Nagaland System comprising ofDimapur , Kohima and Mokukchung
SUB SYSTEM#2:Lower Assam comprising of BTPS, Agia, Dhaligaon, Barnagar, Nalbari,
Rangia, Sipajhar, Sarusajai, Kahilipara and Langpi
6.1.2 ISLAND B: Upper Assam comprising of NTPS, LTPS with Dibrugarh,
Nazira and Tinsukia
6.1.3 ISLAND C: comprising of Meghalaya System
6.1.4 ISLAND D:comprising of AGTPP(NEEPCO), Tripura and Mizoram
6.1.5 ISLAND E: comprising of Loktak (NHPC) and Manipur
6.1.1 Restoration of systems to be built up by utilizing power from ER
Sub-system #1 and sub-system #2 shall be restored in parallel after taking power from
Eastern Region. Simultaneously, all the generating Stations which have black-start
facilities are to be advised to bring their units as fast as possible, so that, islands can be
formed for early restoration of the system
6.1.1.1 Restoration of sub-system #1
Restoration of sub-system #1 consists of Main NER network, Arunachal,Central Assam,
South Assam and Nagaland. Restoration procedure of this sub-system is as follow:-
1) Power required for this sub system shall be taken from New Siliguri (ER) Sub-
Station to Bongaigaon (NER) Sub-Station through any one of 400 kV D/C New
SiliguriBongaigaon lines.
2) In case of delay in receiving power from New Siliguri (ER) Sub-Station, then the
following procedure shall be adopted :-
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Salakati (NER) Sub-Station shall receive power from Birpara (ER) Sub-Station
through any one of 220 kV D/C Birpara Salakati lines. Any one of 400 kV
Bus(s) at Bongaigaon Sub-Station shall be charged through 315 MVA ICT at
Bongaigaon Sub-Station. Again, Salakati Sub-Station shall charge any one of220 / 132 kV , 50 MVA ICT & shall extend power to Gelephu through 132 kV
S/C Saklakati Gelephu line.Load at Gelephu can be connected in co-
ordination with NLDC & Bhutan. Bus Reactors (at Annex III) at New Siliguri Sub-
Station and Bongaigaon Sub-Station shall be taken into service to contain
voltage. Bongaigaon (PG) Sub-Station shall extend power to Balipara (PG) Sub-
Station through any one of 400 kV D/C Balipara Bongaigaon lines. Any one of
220 kV Bus(s) at Salakati Sub-Station shall be charged through 315 MVA ICT at
Bongaigaon Sub-Station. If required, Tertiary Reactor at Bongaigaon (at Annex
III) may be taken into service to contain voltage.
Restoration of Arunachal Pradesh
3) Balipara (PG) Sub-Station shall extend power to Misa (PG) Sub-Station through
any one of 400 kV D/C BaliparaMisa lines and Shunt Reactors (at Annex III) at
Balipara and Misa Sub-Stations shall be taken into service to contain voltage.
Any one of 220 kV Bus(s) at Balipara Sub-Station shall be charged through any
one of 2 x 315 MVA ICT at Balipara Sub-Station. If required, Tertiary Reactor at
Balipara (at Annex III) may be taken into service to contain voltage. 132 kV Bus
at Balipara Sub-Station shall be charged through 2X50 MVA ICT at Balipara
Sub-Station. Balipara Sub-Station shall extend power to Khupi & Kimi Sub-
Stations of Arunachal through 132 kV Balipara Khupi - Kimi lines. Load at
Khupi & Kimi shall be connected in co-ordination with SLDC, Arunachal Pradesh.
4) Ranganadi (NEEPCO) Power Station can receive power from Balipara (PG)
Sub-Station through any one of 400 kV D/C BaliparaRanganadi lines. Any one
of 132 kV Bus(s) at Ranganadi Power Station shall be charged through any one
of 2X360 MVA ICT at Ranganadi Power Station. Ranganadi (NEEPCO) Power
Station shall extend power to SMS (Arunachal Pradesh) and Nirjuli (PG) Sub-
Stations through 132 kV S/C RanganadiSMS - Nirjuli (T Connection at SMS)
and shall extend power to Daporijo and Along (Arunachal Pradesh) Sub-Stations
through 132 kV S/C Ranganadi Ziro - DaporijoAlong lines. Shunt Reactors
(at Annex III) at Ranganadi Power Station shall be taken into service to contain
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voltage. Load shall be connected at SMS, Ziro, Daporijo and Along in co-
ordination with SLDC, Arunachal Pradesh.
5) 33 kV Bus at Nirjuli Sub-Station shall be charged through any one of 1X10+1X16
MVA ICT at Nirjuli Sub-Station. Nirjuli Sub-Station shall extend power to Itanagar(Arunachal Pradesh) Sub-Station through any one of four nos of 33 kV feeders.
Itanagar Sub-Station can also receive power from SMS Sub-Station through
Naharlagun (Arunachal Pradesh) Sub-Station. Load shall be connected at
Itanagar in co-ordination with SLDC, Arunachal Pradesh.
Restoration of Cental Assam6) Balipara (PG) Sub-Station shall also extend power to Gohpur (Assam) Sub-
Station through 132 kV S/C BaliparaGohpur line. Gohpur Sub-Station can also
receive power from Samaguri and Depota Sub-Stations through 132 kV
Samaguri Pavoi (Bishwanath Chariali) - Gohpur line and 132 kV Depota
Pavoi (Bishwanath Chariali) Gohpur line respectively. Load shall be connected
at Gohpur in co-ordination with SLDC, Assam. Balipara (PG) Sub-Station shall
extend power to Depota(Assam) Sub-Station through 132 kV Balipara Depota
line. Load at Depota shall be connected in co-ordination with SLDC, Assam.
Depota Sub-Station shall extend power to Rowta Sub-Station through 132 kV
Depota Rowta line. Load at Rowta shall be connected in co-ordination with
SLDC, Assam.
7) Gohpur (Assam) Sub-Station shall extend power to North Lakhimpur, Dhemaji
and Majuli Sub-Stations. Loads at North Lakhimpur, Dhemaji and Majuli shall be
connected in co-ordination with SLDC, Assam.
8) Ranganadi (NEEPCO) Power Station shall bring their machines if required and
synchronize with this sub-system. Otherwise, if the power received from Balipara
Sub-Station is delayed, Ranganadi Power Station shall black start one of their
three units and shall charge 132 kV Bus and extend power to SMS, Nirjuli & Ziro
Sub-Stations and wait for extension of power from Balipara Sub-Stations. If
possible they can also charge one circuit of 400 kV D/C Ranganadi Balipara
line for synchronization.
9) Gohpur Sub-Station can also receive power from Nirjuli (PG) Sub-Station
through 132 kV NirjuliGohpur line.
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Note : SLDC, Ass am and Arunach al Pradesh sh al l co-ordinate with NERLDC
before connect ing loads to their systems.
10) Any one of 220 kV Bus(s) at Misa Sub-Station shall also be charged through anyone of 2 x 315 MVA ICT at Misa Sub-Station after receiving power from Balipara
(PG) Sub-Station. If required, Tertiary Reactor at Misa (at Annex III) may be
taken into service to contain voltage.
11) Misa Sub-Station shall extend power to Samaguri (Assam) Sub-Station through
any one of 220 kV D/C MisaSamaguri lines. Shunt Reactors (at Annex III) at
Samaguri Sub-Station shall be taken into service to contain voltage. 132 kV Bus
at Samaguri Sub-Station may be charged through any one of 3X50 MVA ICT.
Load at Samagurishall be connected in co-ordination with SLDC, Assam.
12) Misa Sub-Station shall extend power to Byrnihat (Meghalaya) Sub-Station
through any one of 220 kV D/C Misa Killing (Byrnihat) lines. 132 kV Bus at
Byrnihat Sub-Station shall be charged through any one of 2X160 MVA ICT.
Byrnihat Sub-Station shall extend power to EPIP II Sub-Station through any one
of 132 kV D/C ByrnihatEPIP II lines. Load at EPIP II may be catered to in co-
ordination with SLDC, Meghalaya. EPIP II Sub-Station shall extend power to
EPIP I Sub-Station through any one of 132 kV D/C EPIP II EPIP I lines. Load
at EPIP I may be catere to in co-ordination with SLDC, Meghalaya and power
shall be extended progressively to Meghalaya power stations for synchronization
of machines. The related segregated operations will be carried out in close
coordination with NERLDC.
13) Byrnihat (Killing) shall extend power to Silchar sub-station through 400 kV S/C
SilcharByrnihat line, if voltage permits.
14) Mariani (Assam) Sub-Station can receive power either from Misa Sub-Station
through 400 kV S/C Misa Mariani line (Charged at 220 kV) or Samaguri
(Assam) Sub-Station through 220 kV S/C SamaguriMariani line (presently one
circuit is available). Shunt Reactors (at Annex III) at Mariani Sub-Station shall be
taken into service to contain voltage. Load at Mariani shall be connected in co-
ordination with SLDC, Assam.
15) Kopili (NEEPCO) Power Station shall receive power from Misa Sub-Station
through any one of 220 kV T/C Misa Kopili lines. Kopili Power Station shall
bring their machines by taking start up power from this sub-system and
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synchronize the machines with this sub-system. Otherwise, if the power received
from Misa Sub-Station is delayed, Kopili Power Station shall black start one of
four units and shall charge 220 kV Bus and extend power to Khandong Power
Station and wait for extension of power from Misa Sub-Stations.16) 132 kV Bus at Kopili Power Station shall be charged through 160 MVA ICT at
Kopili Power Station.
17) Kopili Power Station shall extend power to Khandong (NEEPCO) Power Station
through any one of 132 kV D/C Kopili Khandong lines. Khandong Power
Station shall bring machines, if required, by taking startup power from this sub-
system and synchronize the machines with this sub-system. Otherwise, if the
power received from Kopili Power Station is delayed, Khandong Power Station
shall black start one of three units and shall charge 132 kV Bus and extend
power to Haflong & Khliehriat Sub-Stations and wait for extension of power from
Kopili Power Station. If possible, they can also charge one circuit of 132 kV D/C
KopiliKhandong lines for synchronization.
Restoration of South Assam
18) Khandong Power Station shall charge 33 kV Bus through any one of
1X16+1X7.5 MVA Transformer. Khandong shall extend power to Umrangshoo
Sub-Station through 33 kV S/C of Khandong Umrangshoo line. Load at
Umrangsho shall be connected in co-ordination with SLDC, Assam.
19) Khandong Power Station shall extend power to Khliehriat (PG) and Haflong (PG)
Sub-Stations through any one of 132 kV D/C of KhandongKhliehriat lines and
132 kV S/C KhandongHaflong line respectively.
20) Khliehriat (PG) Power Station shall extend power to Badarpur (PG) Sub-Station
through 132 kV S/C Khliehriat- Badarpur line.
21) Badarpur Sub-Station shall extend power to Panchgram (Assam) Sub-Station
through 132 kV S/C Badarpur Panchgram line. Panchgram Sub-station shall
also receive power from Silchar through 132 kV Silchar Panchgram line.
Panchgram Sub-Station shall extend power to Srikona Sub-Station through 132
kV Panchgram Srikona line. Srikona shall extend power to Pailapool through
132 kV S/C SrikonaPailapool line. Load at Panchgram, Srikona and Pailapool
shall be connected in co-ordination with SLDC, Assam.
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22) This sub-system shall be synchronized with Island D at Badarpur (PG) through
132 kV S/C BadapurKumarghat line.
23) Again, Badarpur shall extend power to Silchar through any one of132 kV D/C
BadarpurSilchar lines. Silchar shall extend power to Srikona through any oneof 132 kV D/C Silchar - Srikona lines.
24) Silchar shall charge any one of 400 kV bus through any one of 400 / 132 kV 2
x200 MVA ICT. All the shunt reactors at Silchar sub-station (at Annex III) shall be
put into service to contain voltage.
25) Silchar shall extend power to Palatana Power station through any one of 400 kV
D/C SilcharPalatana Lines, if voltage permits. Before this, Palatana shall take
start up power through any one of 132 kV Udaipur Palatana and 132 kV
Surjyamani Nagar - Palatana of Tripura system (Island D) and shall synchronise
its unit.
26) This sub-system shall be synchronized with Island E at Badarpur (PG) through
132 kV S/C BadapurJiribam line.
27) This sub-system shall be synchronized with Island C at Khliehriat (PG) through
132 kV D/C KhliehriatKhliehriat lines.
28) Badarpur Sub-Station shall extend power to Kolasib (Mizoram) Sub-Station
through 132 kV S/C BadarpurKolasib line. Load at Kolasib shall be connected
in co-ordination with SLDC, Mizoram.
29) Kolasib Sub-Station shall extend power to Bairabi (Mizoram) Power Station for
survival/auxiliary power through 66 kV KolasibBairabi line.
30) Haflong (PG) Sub-Station shall extend power to Haflong (Assam) Sub-Station
through 132 kV S/C HaflongHaflong line. Load at Haflong shall be connected
in co-ordination with SLDC, Assam.
31) Mariani Sub-Station shall extend power to AGBPP (NEEPCO) through 400 kV
S/C Mariani AGBPP line (charged at 220 kV). AGBPP shall bring their
machines by taking start up power from this sub-system and synchronize the
machines with this sub-system. AGBPP shall extend power to Deomali
(Arunachal Pradesh) Sub-station through 220 kV S/C AGBPP Deomali line.
Load at Deomali shall be connected in co-ordination with SLDC, Arunachal
Pradesh.
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32) Misa (PG) Sub-Station shall extend power to Dimapur (PG) Sub-station through
any one of 220 kV D/C Misa Dimapur lines. 132 kV Bus at Dimapur Sub-
Station shall be charged through any one of 2X100 MVA ICT at Dimapur.
Restoration of Nagaland system33) Dimapur (PG) Sub-Station shall extend power to Dimapur (Nagaland) Sub-
Station through any one of 132 kV D/C DimapurDimapur line. Load at Dimapur
shall be connected in co-ordination with SLDC, Nagaland.
34) Dimapur (PG) Sub-station shall extend power to Kohima Sub-Station through
132 kV S/C Dimapur Kohima line. Load at Kohima shall be connected in co-
ordination with SLDC, Nagaland.
35) Kohima Sub-station shall extend power to Meluri Sub-Station through 132 kVS/C KohimaMeluri line. Load at Meluri shall be connected in co-ordination with
SLDC, Nagaland.
36) Meluri Sub-Station shall extend power to Khiphire Sub-Station through 132 kV
S/C Meluri Khiphire line. Load at Khiphire shall be connected in co-ordination
with SLDC, Nagaland.
37) 66 kV Bus at Khiphire Sub-Station shall be charged through any one of 3X6.5
MVA ICT at Khiphire Sub-Station.
38) Khiphire Sub-Station shall extend power to Likhimro Power Station through 66
kV KhiphireLikhimro line.
39) Dimapur (PG) Sub-Station shall also extend power to Doyang (NEEPCO) Power
Station through any one of 132 kV D/C Dimapur Doyang lines. Doyang Power
Station shall bring generation, if required and synchronize.Otherwise, if the
power received from Dimapur Sub-Station is delayed, Doyang Power Station
shall black start one of three units & shall charge 132 kV bus and extend power
to Mokakchung Sub-Station.
40) Doyang (NEEPCO) Power Station shall extend power to Mokokchung Sub-
Station through 132 kV S/C Doyang Mokukchung line. Load at Mokokchung
shall be connected in co-ordination with SLDC, Nagaland.
41) This sub-system may also be synchronized with Island E at Dimapur (PG)
through 132 kV S/C DimapurImphal line.
42) Dimapur (PG) Sub-Station can also receive power form Mariani Sub-Station
through 132 kV S/C MarianiGolaghatBokajan - Dimapur line.
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43) Mokokchung Sub-Station can also receive power from Mariani Sub-Station
through 132 kV S/C MarianiMokokchung line. Presently 132 kV S/C Mariani
Mokokchung line is under long outage. Early restoration of this line will help to
extend power to Mokokchung.
Note: SLDC, Ass am and Nagaland sh al l co-ordinate with NERLDC before
conn ect ing loads to their system
If ER power received by Misa Sub-Station is delayed then power shall be
taken from the following sources:-
i. From Island C, Khliehriat (PG) Sub-Station can receive power from
Khliehriat (Meghalaya) Sub-Station through any one of 132 kV D/C
KhliehriatKhliehriat lines.
ii. From Island C, Panchgram (Assam) Sub-Station can receive power from
Khliehriat (Meghalaya) Sub-Station through 132 kV S/C Khliehriat
Lumnsnong - Panchgram line.
iii. From Island D, Badarpur (PG) Sub-Station can receive power from
Kumarghat Sub-Station through 132 kV S/C BadarpurKumarghat line.
iv. From Island D, Kolasib Sub-Station can receive power from Aizawl Sub-
Station through 132 kV S/C KolasibAizawl line
v. From Island D, Panchgram (Assam) Sub-Station can receive power from
Dharmanagar Sub-Station through 132 kV S/C Dharmanagar -
Dullavcherra - Panchgram line.
vi. From Island E, Haflong (PG) Sub-Station can receive power from Jiribam
Sub-Station through 132 kV S/C HaflongJiribam line.
vii. From Island E, Dimapur (PG) Sub-Station can receive power from
Imphal(PG) Sub-Station through 132 kV S/C Imphal - Dimapur line.
6.1.1.2 Restoration of sub-system #2
Restoration of sub-system #2 consists of Lower Assam. Restoration procedure for this
sub-system is as follow:-
1) From sub-system #1, Salakati (PG) Sub-Station shall extend power to BTPS
(Assam) Sub-Station through any one of 220 kV D/C SalakatiBTPS lines.
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2) BTPS Sub-Station shall extend power to Agia (Assam) Sub-Station through 220
kV BTPS Agia line. Presently one circuit of 220 kV BTPS Agia is available.
Load at Agia shall be connected in co-ordination with SLDC, Assam.
3) 132 kV Bus at BTPS Sub-Station shall be charged through any one of2X80+1X160 MVA ICT at BTPS Sub-Station. BTPS Sub-Station shall extend
power to Dhaligaon (Assam) Sub-Station through any one of 132 kV D/C BTPS
Dhaligaon lines. Load at Dhaligaon shall be connected in co-ordination with
SLDC, Assam.
4) Dhaligaon Sub-Station shall extend power to Rangia (Assam) Sub-Station and
Barnagar (Assam) Sub-Station through 132 kV Dhaligaon Barnagar and 132
kV Dhaligaon Nalbari - Rangia lines. Load at Nalbari, Rangia and Barnagar
shall be connected in co-ordination with SLDC, Assam. 132 kV S/C Rangia
Barnagar line shall be closed.
5) Again, Rangia shall extend power to Motonga (Bhutan) through 132 kV Rangia
Motonga line. Gelephu can also receive power through Motonga.
6) Rangia Sub-Station shall extend power Sisugram (Assam) Sub-Station through
132 kV S/C RangiaSishugram line. Load at Sishugram shall be connected. If
required, Rangia Sub-Station shall extend power to Rowta Sub-Station too
through 132 kV RangiaSipajhar - Rowta & 132 kV RangiaRowta line. Load
at Sipajhar & Rowta may be connected in co-ordination with SLDC, Assam.
7) Agia (Assam) Sub-Station shall extend power to Sarusajai (Assam) Sub-Station
through 220 kV S/C Agia Sarusajai or 220 kV Agia Boko Sarusajai lines.
132 kV Bus at Sarusajai Sub-Station shall be charged through any one of 3X100
MVA ICT at Sarusajai. Load at Sarusajai & Boko shall be connected in co-
ordination with SLDC, Assam.
8) Sarusajai Sub-Station shall extend power to Kahilipara (Assam) Sub-Station
through any one line of four nos. of 132 kV SarusajaiKahilipara lines. Load at
Kahilipara shall be connected in co-ordination with SLDC, Assam.
9) Sarusajai Sub-Station shall extend power to Langpi (Assam) Power Station
through any one of 220 kV D/C Sarusajai Langpi lines. Sarusajai shall also
extend power to Jahawar Nagar(GIS) Sub-station through 220 kV Sarusajai -
Jahawar Nagar(GIS) line.
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10) Kahilipara Sub-Station can also receive power from Rangia and Sisugram Sub-
Stations through 132 kV S/C RangiaKahilipara line and 132 kV S/C Sisugram
Kahilipara line respectively.
11) Sarusajai Sub-Station can also receive power from Samaguri Sub-Station of sub-system #1 through 220 kV D/C SarusajaiSamaguri -II
Remark: SLDC, As sam shall co-ord inate wi th NERLDC/Meghalaya SLDC
before connect ing loads.
Note : If ER power intended to be received by this system is delayed then power
shall be taken/extended from the following sources :-
i. From Island C, Sarusajai Sub-Station can receive power from Umtru
(Meghalaya) Power Station through any one of 132 kV D/C Umtru -
Sarusajai lines.
ii. From Island C, Kahilipara Sub-Station can receive power from Umtru
(Meghalaya) Power Station through any one 132 kV D/C Umtru -
Kahilipara lines.
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6.1.2 Restoration of Island B
Restoration Island B consists of Upper Assam. Restoration of this Island could be done
by its own black-start facility as in follow:
1) NTPS (Assam) shall black-start and charge 66 kV Bus at NTPS. Load at NTPS
shall be connected in co-ordination with SLDC Assam. NTPS shall bring and
synchronize other units.
2) NTPS shall extend power to LTPS (Assam) through any one of 132 kV D/C
LTPSNTPS lines. LTPS shall bring generation and synchronize.
3) NTPS shall extend power to Tinsukia & Nazira (Assam) Sub-Stations through
any one of 66 kV D/C NTPS Tinsukia and any one of 66 kV D/C NTPS
Nazira lines respectively. Load at Tinsukia and Nazira shall be connected in co-
ordination with SLDC Assam.
4) 132 kV Bus at NTPS shall be charged through any one of 2X25 MVA ICT at
NTPS.
5) NTPS shall also extend power to Tinsukia (Assam) Sub-Station through 132 kV
S/C NTPS -Tinsukia line.
6) LTPS shall extend power to Dibrugarh (Assam) Sub-Stations through 132 kV
S/C LTPS Dibrugrah and 132 kV S/C LTPS - Nazira line. Load at Dibrugarh
shall be connected in co-ordination with SLDC Assam. 132 kV LTPS Nazira
line shall be closed.
7) This island shall be synchronized with sub-system #1 at Mariani (Assam) through
132 kV S/C LTPSMariani line.
Note: If Black start by NTPS is not possible, then start up power for this Island
shall be received from the following sources:-
i. From sub system #1, Tinsukia Sub-Station can receive power from
AGBPP through any one of 220 kV D/C Tinsukia AGBPP line andshall extend start up power to NTPS through 132 kV S/C Tinsukia
NTPS line.
ii. From sub system #1, LTPS can receive power from Mariani Sub-Station
through 132 kV S/C MarianiLTPS line.
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6.1.3 Restoration of Island C
Restoration of Island C consists of Meghalaya System. Meghalaya system can be built
up by its own black-start facilities. Restoration procedure for this Island is as follow:-
1) Umiam St I Power Station shall black-start and charge 132 kV Bus at Umiam St IPower Station. Umiam St III Power Station shall also black start and charge132
kV Bus at Umiam St III Power Station.
2) Umiam St I Power Station shall synchronize with Umiam St III Power Station at
Umium St III Power Station through any one of 132 kV D/C Umiam St I Umiam
St III lines. Umiam St I & III Power Stations shall bring and synchronize other
machines. Load at Umiam St III shall be connected in co-ordination with SLDC
Meghalaya.3) Umiam St I Power Station shall extend power to Umiam St II Power Station
through 132 kV S/C Umiam St I Umiam II line for survival/auxiliary power.
Umiam St II Power Station shall bring generation if required and synchronize.
4) Umiam St III Power Station shall extend power to Umiam St IV Power Station
through any one of 132 kV D/C Umiam St III Umiam IV line for
survival/auxiliary power. Umiam St IV Power Station shall bring generation if
required and synchronize.
5) Umiam St III Power Station shall extend power to Umtru Power Station through
any one of 132 kV D/C Umiam St III Umtru lines. Load at Umtru shall be
connected in co-ordination with SLDC Meghalaya. Umtru Power Station shall
bring generation if required and synchronize.
6) Umiam St I Power Station shall extend power to Mawlai and NEHU Sub-Stations
through 132 kV S/C Umiam St I Mawlai line and 132 kV S/C Umiam St I
Umiam - NEHU line respectively. Load at Mawlai, Umiam and NEHU shall be
connected in co-ordination with SLDC Meghalaya.
7) NEHU Sub-Station shall extend power to Khliehriat Sub-Station through 132 kV
S/C NEHU NEIGRIHMS - Khliehriat line or 132 kV NEHU Khliehriat line.
Load at Khliehriat and NEIGRIHMS shall be connected in co-ordination with
SLDC Meghalaya.
8) Khliehriat Sub-Station shall extend power to Lumsnong Sub-Station through 132
kV S/C Khliehriat- Lumsnong line.Load at Lumsnong shall be connected in co-
ordination with SLDC Meghalaya.
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9) Again, Power shall be extended to Leshka power station from Khliehriat
(Meghalaya) Sub-Station through 132 kV D/C KhliehriatLeshka lines.
10) This island shall be synchronized with sub-system #2 at Sarusajai (Assam) Sub-
Station and Kahilipara (Assam) Sub-Station through any one of 132 kV D/CUmtru Sarusajai lines or through any one of 132 kV D/C Umtru Kahilipara
lines.
11) This island shall be synchronized with sub-system #1 at Khliehriat (PG) Sub-
Station through any one of 132 kV D/C KhliehriatKhliehriat lines from Badarpur
(PG) via restored Island D.
Note: If Black Start by Meghalaya Power Stations is not possible then start up power
for this Island shall be received from the following sources:
i. From sub-system#1, Khliehriat (Meghalaya) Sub-Station can receive
power from Khliehriat (PG) Sub-Station through any one of 132 kV D/C
KhliehriatKhliehriat lines and extend power to Umiam St I and Leshka
Power Station through NEHU & Umiam Sub-Stations and 132 kV D/C
KhliehriatLeshka lines respectively, for brining generation.
ii. From Sub System #1, Khliehriat (Meghalaya) Sub-Station can receive
power from Panchgram (Assam) Sub-Station through 132 kV
Panchgram - LumsnongKhliehriat line.
iii. From Sub System #2, Umtru (Meghalaya) Sub-System can receive
power from Sarusajai (Assam) Sub-Station through any one of 132 kV
D/C Sarusajai Umtru lines and extend power to Umiam St III Power
Station through any one of 132 kV D/C Umiam St III - Umtru for brining
generation.
iv. From Sub System #2, Umtru (Meghalaya) Sub-Station can receive
power from Kahilipara (Assam) Sub-Station through any one of 132 kV
D/C Kahilipara Umtru lines and extend power to Umiam St III Power
Station through any one of 132 kV D/C Umiam St III - Umtru for brining
generation.
v. From Sub System #1, Umtru (Meghalaya) Sub-Station can receive
power from Killing (Meghalaya) Sub-Station through 132 kVD/CKilling
EPIPIIUmtru
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North Eastern Regional Load dispatch Centre, Shillong
6.1.4 Restoration of Island D :
Restoration of Island D consists of AGTPP, Tripura and Mizoram. AGTPP and Tripura
System can restore its system by their own black start facilities. Restoration procedure
for this Island is as follow:-
Restoration of Tripura system
1) Rokhia (Tripura) Power Station shall black start and charge 66 kV Bus at
Rokhia Power Station. Load at Rokhia shall be connected in co-ordination with
SLDC, Tripura. Rokhia Power Station shall bring and synchronize other
machines.
2) 132 kV Bus at Rokhia Power Station shall be charged through 30 MVA ICT at
Rokhia Power Station.
3) Rokhia Power Station shall extend power to Agartala Sub-Station through any
one of 132 kV D/C RokhiaAgartala lines. Load at Agartala shall be connected
in co-ordination with SLDC, Tripura.
4) AGTPP (NEEPCO) shall black start one of its unit and charge 132 kV Bus at
AGTPP. AGTPP shall synchronize Tripura System through any one of 132 kV
D/C AGTPP Agartala lines. AGTPP shall bring and synchronize other
machines.5) Agartala Sub-Station shall extend power to Baramura Power Station through
132 kV S/C Agartala Budhjangnagar Jirania - Baramura lines. Baramura
Power Station shall bring generation and synchronize with this Island.
6) Budhjangnagar shall extend power to S Nagar through 132 kV Budhjangnagar -
S Nagar line.Then S Nagar sh