Punjab Islanding Scheme - Northern Regional Power Committee

(A State Govt. undertaking) 

REPORT 

ON 

PUNJAB ISLANDING SCHEME 

(JANUARY, 2013) 

Revised [R1] 

Office of 

Chief Engineer/SLDC, 

Punjab State Transmission Corporation Limited 

E-mail: ce-soc@pstcl.org

INDEX 

CHAPTER 

Page No. 

1. Preamble 1-2 

2. Overview of Punjab Power System 3 

3. General Philosophy on formation of Islands 4 

4. Islanding Scheme for Punjab Control Area 5-7 

5. Detail of Proposed Islands 

5.1 GGSSTP Ropar Island 8-10 

Detail of Load to be met (Annexure- I A) 

Detail of Lines to be opened and Re-closed (Annexure-I B) 

Sketch of GGSSTP Ropar Island (Annexure-I C) 

i-ii 

iii-iv 

v-xiv 

5.2 GNDTP Bathinda & GHTP Lehra Mohabat Island 11-13 

Detail of Load to be met (Annexure-II A) 

Detail of Lines to be opened and Re-closed (Annexure-II B) 

Sketch of GNDTP Bathinda & GHTP Lehra Mohabat Island (Annexure- 

II C) 

6.0 Proposed Action Plan. 14-15 

7.0 Major Challenges & Way Forward 16 

8.0 Additional Annexures: 

APPENDIX 

Technical Specification of UFRs ( Annexure III) 

Bill of Material of UFRs 

(Annexure IV) 

Status of connectivity & RTU availability at Sub stations 

( Annexure V) 

Line network Diagram of System and boundary of Islands 

(Annexure VI) 

i-ii 

iii 

iv-x 

17-18 

I Minutes of 1st Meeting of Islanding Scheme Group held on 7- 22-25 

Aug-2012 

II Transmission Map of Punjab Network (132 KV and above) 26 

III 

Detail of Under Frequency Relays (UFRs) and df/dt Relays 

installed at various Grid Sub Stations in Punjab 

19 

20 

21 

27-30

CHAPTER-1.0 

1.0 PREAMBLE 

1.1 Two major grid failure incidents occurred on 30 th and 31 st July, 2012 affecting a 

large area of power network covering states namely Uttar Pradesh, Uttarkhand, 

Punjab, Haryana, Rajasthan, Himachal Pradesh, Delhi falling under Northern 

Region beside other states of Eastern (ER) & North- Eastern (NER) regions during 

grid failure on 31.7.2012. In order to look in to the issues related to the Grid failures 

and take necessary remedial measures, Ministry of Power (MoP), Govt. of India 

(GoI) and North Indian States deliberated various steps to be taken during North 

India Chief Ministers and Power Minister, GOI conference held at Delhi on 6 th 

August 2012. A twelve point resolution was approved to avoid grid 

disturbance/collapse in future. As per the MoP directive, all states must 

ascertain preparedness of power system defense plans and protection 

system in accordance with the Indian Electricity Grid Code (IEGC), whi ch 

shall include islanding schemes, Under Frequency Relays (UFR), rate of 

change frequency relays (df/dt), special protection schemes (SPS) and 

automatic demand management schemes. 

1.2 An Expert Committee constituted to enquire into the said Power Grid Disturbance 

and to suggest remedial measures, has also inter alia made the following 

recommendations:- 

"Effort should be made to design islanding scheme based on frequency sensing 

relays so that in case of imminent grid failure, electrical islands can be formed. 

These electrical islands can not only help in maintaining supply to essential 

services but would also help in faster restoration of grid . 

Action: CEA, RPCs, POWERGRID, STUs, SLDCs and Generators 

Time Frame: 6 months" 

1.3 The Expert Committee has further formed five groups to look in to various 

aspects related to grid disturbances. One of the groups headed by Member 

Secretary, NRPC was formed for islanding scheme in Northern Region. 

Minutes of first meeting of the islanding Scheme group was held at NRPC 

office at Delhi on 07.08.2012. (Copy enclosed as Appendix I) which was 

attended by representatives from all constituents under NR. 

1 

The group 

agreed on various aspects & modalities for implementation of the islanding

scheme. Based on proposals from STUs/SLDCs, preliminary feasibility of 

various islanding schemes was agreed. 

1.4 In order to take up implementation of the islanding scheme in Punjab Control 

Area by PSTCL, deliberations were held with representatives of Power Grid 

(Operation Services Group) who have been associated in finalizing the 

islanding scheme for DTL recently. A study-cum-implementation group has 

also been constituted by PSTCL to identify & work out further modalities for 

taking up design & implementation of the scheme in line with guidelines of 

CEA, NRPC, PGCIL etc. 

1.5 Based on the inputs provided by NRPC/ PowerGrid and deliberations 

amongst study group including PSPCL's representatives from all the three 

major thermal generating stations (GGSSTP, GHTP & GNDTP) and BBMB, 

PSTCL finalized the islanding scheme for Punjab control area, comprising 

of the following 3 no. island; 

i) GGSSTP Ropar with Gobindgarh area load. 

ii) GHTP & GNDTP with Bathinda area load. 

iii) BBMB Jamalpur with Ludhiana load. 

The Punjab Islanding scheme report dated 20.11.2012 was submitted to 

NRPC for approval. 

1.6 The Islanding scheme was reviewed by NRPC/CEA during presentation 

made by PSTCL held at NRPC, New Delhi on 21 st Dec, 12. Based on the 

suggestions/comments made by NRPC/CEA during the presentation, the 

revised Islanding scheme has been prepared. 

1.7 The major modifications /revisions made are as under;- 

i) Only 2 no islanding scheme for GGSSTP and GHTP cum GNDTP 

generating stations has been retained thereby excluding BBMB 

Jamal Pur scheme as proposed earlier since BBMB Bhakra hydel 

Units have quick black start facility. 

ii) Both summer/paddy season (peak period) and winter season 

average (off peak period) loading scenarios have been considered. 

iii) Remote monitoring and control of islands through MMI/SCADA based 

intelligent system at SLDC has been incorporated to manage the 

islands, on the pattern of DTL scheme. 

iv) 2 no important railway feeding stations at Sahnewal & Jamsher have 

been included in the proposed islands. 

2

CHAPTER 2.0 

2.0 OVERVIEW OF PUNJAB POWER SYSTEM 

2.1 The Transmission functions in Punjab Power System are performed by 

Punjab State Transmission Corporation Ltd. (PSTCL) whereas Generation & 

Distribution functions are performed by Punjab State Power Corporation Ltd. 

(PSPCL). Punjab Power System is operative with a number of generating 

stations both Thermal and Hydel (Total Gross Generation = 3650 MW 

approx) in the state sector owned by PSPCL. Beside this Punjab also draws 

its share from BBMB Hydro-Generating stations through BBMB Transmission 

network.The Punjab network is also linked with 400 KV PGCIL network at 

Malerkotla, Moga, Patiala, Ludhiana, Jalandhar and Amritsar to draw Central 

sector share. 

2.2 The transmission network of Punjab consists of 132 KV & 220 KV network 

spread all over the state. Presently, a major 400 KV transmission network in 

PSTCL is also in advanced stage of commissioning mainly for the evacuation 

of power from upcoming Thermal Power Stations in Private sector (IPPs) at 

Talwandi Sabo and Rajpura. The transmission map of Punjab 132 KV & 

above is attached as Appendix II 

2.3 The Punjab has transformation capacity of 20800MVA approx. and 220 kV & 

132 kV transmission lines of 8200 Ckt. Km (as on 31.07.12).There is a plan 

to add further transformation capacity of 2000MVA during 2013-14 and 

2000MVA in 2014-15. The present transformation capacity of ICTs located in 

Powergrid Grid Sub-stations in Punjab is also being augmented under Inter 

state system strengthening scheme undertaken by Power grid. 

Corresponding to these transformation capacity additions, new transmission 

links are being added/planned by PSTCL at respective Grid sub stations. 

3

CHAPTER 3.0 

3.0 GENERAL PHILOSOPHY ON FORMATION OF ISLANDS 

3.1 During Grid disturbance ,the control area shall endeavor to sustain through 

the under frequency relays (UFRs) and df/dt relays based load shedding 

scheme , already installed in the system, as a first line of defense. Only in 

case, this defense mechanism fails and frequency continues its fall to 

dangerously low levels, formation of islands shall be initiated as a last resort. 

3.2 For success of islanding scheme, the load - generation balance in the islands 

shall be maintained. To achieve this, at least one of the generators within the 

island, shall operate with governor in frequency control mode. 

3.3 Islanding scheme shall primarily be a two tier scheme. At frequency of 47.9 

Hz, signal/command for formation of islands comprising of more than one 

generating station along with pre-identified load shall be initiated. However, if 

after the formation of island, frequency continues to fall further to say 47.7 

Hz, these islands could be further broken into smaller islands or load 

shedding shall be initiated within the island. 

3.4 Load generation balance in pre-identified island may change based on 

variation in seasonal demand, load growth and network changes, if any. 

Islanding scheme shall therefore require intermittent review and readjustments 

of loads to be cut-in/cut-off to match load - generation balance. 

3.5 Efforts shall be made to cover major essential loads such as hospitals, 

railway traction etc. in the proposed island. However, if it is not possible due 

to some reasons, efforts should be made to extend supply from these islands 

to identified essential loads on priority basis. 

4

CHAPTER-4.0 

4.0 ISLANDING SCHEME FOR PUNJAB CONTROL AREA: 

4.1 Objective: 

Formation of proposed island shall achieve the following objectives:- 

i) Prevention from total black out by avoiding effect of cascade tripping of 

the Power System. 

ii) Fast restoration of supply to the affected areas. 

iii) Supply to Important Loads/essential services i.e. Railways, Hospitals 

etc. shall be maintained or can be restored on priority 

4.2 Present Status: 

Presently there is no islanding scheme in operation in Punjab. However, 

UFRs, df/dt relays have been installed on selected feeders to get desired load 

relief under critical grid conditions to help grid security. A list of existing UFR 

and df/dt relays is attached as Appendix III. 

4.3 Proposed Islands: 

The following islands have been proposed ,as identified by the Islanding 

Scheme Group at NRPC in its meeting held on 07.08.2012 and further 

deliberations held at NRPC on 21.12.12. :- 

GGSSTP Ropar with Gobindgarh area load. 

GHTP & GNDTP with Bathinda area load. 

4.4 Methodology of Proposed Islanding Scheme; 

Broad methodology adopted for the proposed Islanding scheme is as under :- 

i) The scheme is primarily based on frequency measurement. This 

measurement will be done through digital frequency sensing relays 

(UFRs) to be installed at substations falling within island where 

5

switching action is required. 

ii) 

The proposed island scheme shall required to be configured /reconfigured 

for peak and off peak operating conditions. The preidentified 

relays ( UFRs) at the sub stations shall be enabled during off 

peak period to cover the extended load , to match the available 

generation. These relays shall be disabled during peak period. 

iii) 

The proposed islanding scheme operations consists of three stages as 

under;- 

a) Stage I: When frequency dips to level of 47.9 Hz 

b) Stage II: When frequency further dips to level of 47.7 Hz 

c) Stage III: When frequency stays at 47.7 Hz* 

* additional load shedding at an interval of 300 

milli-seconds up to 2 seconds in steps 

iv) 

Disconnection of feeders will be triggered through UFRs proposed to 

be installed at Sub stations. Two independent relays, for sensing the 

frequency from each bus of sub station shall be provided at each of the 

sub station falling under the islanding zone, classified as under: 

Relay on Bus-1 = M1 and S1 

Relay on Bus-2 = M2and S2 

v) Up to 3 no 220 KV feeder will have dedicated set of relays (M1 and 

M2) whereas in case of 66 KV feeders, one set of relay (S1 and S2) 

will control up to four 66 KV feeders. S1 & S2 shall also control high 

frequency swings in the island by operating at 50.5 Hz & 51.0 Hz for 

auto reclosing the pre-identified feeders. 

The setting of relays shall be as under:- 

M1 M2 47.9 Hz 

S1 S2 47.7 Hz 

S1 S2 50.5 Hz (for Auto reclosing) 

S1 S2 51.0 Hz (for Auto reclosing) 

6

vi) 

Initially main two islands of Punjab Network will be created during stage 

I of Islanding scheme (i.e. when frequency dips to level of 47.9 Hz ) . 

The large island will further be divided into smaller island(s) during 

stage II of Islanding scheme (i.e. when frequency dips to level of 47.7 

Hz ). 

vi) 

vii) 

One generating station in each island will be operated in frequency 

control mode to control fluctuations in the frequency in that particular 

island. 

Islanding load to be identified shall exclude the anticipated impact due 

to load shedding under defense mechanism prior to islanding through 

existing UFR & df/dt relays. 

4.5 MECHANISM FOR FORMATION AND MAINTAINING ISLANDS 

i) As system frequency is sensed at 47.9 Hz, relays (M1 and M2) will 

operate and trip the identified feeders, thus forming a stage-I island. 

ii) 

vii) 

The frequency of the island so formed shall be further maintained 

through both generator and load end. On generator end, one of the 

units shall be operated in frequency mode and on load side when the 

frequency drops to the level of 47.7 Hz (Stage -II), relays (S1 and S2) 

will operate to switch off the pre-identified 66 KV feeders as per the 

detail provided in the schematic diagram. 

To take care of the power swings due to sudden load throw off during 

formation of island, relays (S1 and S2) will operate at 50.50 Hz/ 51.00 

Hz (Stage III) to auto reclose the pre-identified 66 KV feeders of 4-5 

MW with time delay of 300 msec in steps as per detail provided in the 

schematic diagrams. 

7

CHAPTER-5.0 


ISLANDING - I 

GGSSTP, Ropar 

ISLANDING SCHEME 

8

5.1 GGSTP ROPAR ISLANDING SCHEME 

There are six Units (6x210 MW) at GGSSTP Ropar. Total ex-bus generation 

equals to 940 MW considering availability of 5 units and corresponding 

average load for island scheme @ 80% of 940 MW comes to 755 MW. The 

generation availability is considered as same during peak and off peak 

periods. 

Details of load to be fed to achieve Load-Generation balance is as 

under:- 

Name of S/S Average Load (MW) 

Under Peak Load 

(Summer) 

Average Load (MW) 

Under Off Peak Load 

(Winter) 

220 KV S/S G-1 200 200 

220 KV S/S G-2 120 120 

220 KV S/S G-3 80 80 

220KV S/S G-4 80 40 

220 KV S/S Amloh 120 80 

220 KV S/S Kharar 115 110 

220 KV S/S Kohara 30 30 

220 KV S/S Sahnewal 10( Only Railway Load) 10( Only Railway Load) 

220 KV S/S Jamsher NA 10( Only Railway Load) 

220 KV S/S Goraya NA 75 

Total 755 755 

Note : The UFR presently installed at 220 KV G-1 will be shifted to 220 KV S/S 

Mohali-1 and Mohali-2 (at setting of 48.2 Hz) to meet the above demand. 

Details of sub stations wise load /feeders to be covered for load generation 

balance in the island is as per Annexure-IA 

9

Detail of outgoing feeders/bays to be opened (in order to maintain the above 

anticipated islanding load of 755 MW) is as under:- 

1. 220KV GGSSTP - Mohali Ckt (will be opened at Mohali end) 

2. 220KV Kharar – Mohali Ckt (will be opened at Kharar end) 

3. 220KV Kharar – 132 KV Ropar Ckt 

4. 220KV GGSSTP - Goraya Ckt (will be opened at Goraya end in Summer) 

5. 220KV GGSSTP - Goraya Ckt (will be operative in Winter) 

6. 220KV GGSSTP: Jamsher Ckt (will be opened at Jamsher end in Summer) 

7. 220KV GGSSTP: Jamsher Ckt (will be operative in Winter) 

8. 220/132 KV T/F: T-1 (at GGSSTP S/S) 

9. 220/132 KV T/F: T-2 (at GGSSTP S/S) 

10. 220 KV G-1: Ablowal circuits 1 & 2 (to be opened at G-1) 

11. 220 KV S/S G-1: Ikolaha (at G-1 end) 

12. 220 KV S/S G-2: Ganguwal Circuits 1 & 2 (to be opened at G-2 end) 

13. 220 KV S/S Amloh- Malerkotla (at Malerkotla end) 

14. 220 KV Sahnewal- Lalton (At Sahnewal) 

15. 220 KV Sahnewal- Doraha 1 & 2 (at Sahnewal) 

16. 220 KV Sahnewal-PGCIL (At Sahnewal) 

17. 220 KV Bus-Coupler at Sahnewal 

18. 220 KV S/S Jamsher:- Jalandhar-1,2, Rehana Jattan Mahilpur, Sultanpur- 

1,2, Kotla Junga-1,2, 220KV/66KV T-1,T-2 will be opened at Jamsher End in 

Winter 

19. All 66 KV lines at Kohara & 66/11 KV Power Tfrs. (T-3 & T-4) 

Detail of lines to be opened and re-closed at various sub stations is as per 

Annexure-IB. 

Detail indicating locations of relays is given as per schematic diagram 

attached as Annexure-IC 

10

Details of Load to be met :- 

Page-(i) 

Sr.No. Name of Plant Details of area to be fed Summer 

Load 

Gross Total 

Generation(MW) 

Generation considered for 

islanding purpose(MW) 

Winter 

Load 

Relief 

from 

UFRs(in 

MW) 

(MW) (MW) Paddy 

Load 

Relief from 

df/dt relays(in 

MW) 

Paddy Load 

Relief 

from 

SPS (in 

MW) 

Paddy 

Load 

G. Total 

Load 

relief(MW) 

Paddy Load 

Annexure-IA 

Net Demand 

to be met 

(MW) 

220KV s/s Gobindgarh G-1 200 200 0 0 0 

1 GGSSTP, Ropar 220KV s/s Gobindgarh G-2 120 120 0 0 0 0 755 

(6x210=1260MW) 755 ((i.e. 80% of 945) 220KV s/s Gobindgarh G-3 80 80 0 0 0 

Ex-bus generation of 5 units 220KV s/s Gobindgarh G-4 80 40 0 0 0 

= 945 MW 

220 KV S/S Amloh 120 80 0 0 0 

220 KV S/S Kharar 115 110 0 0 0 

220 KV S/S Kohara 30 30 0 0 0 

220 KV S/S Sahnewal 10 10 0 0 0 

220 KV S/S Jamsher NA 10 

220 KV S/S Goraya NA 75 

Total 755 755 0 0 0 0 755

Page-(ii) 

Details of Break-up of Load to be met :- 

Annexure-IA 

S.No Name of Substations Load (MW) BREAK-UP OF LOAD Load(MW) 

1 220 KV Sub Station 

200 66 KV Ckt Amloh Road-1 0 

Gobindgarh G-1 

66 KV Ckt Amloh Road-2 0 

66 KV Ckt Joti Bansal 20 

66 KV Ckt Modern Steel 25 

66 KV Ckt Dutt Multi 6 

66 KV Ckt Aman 3 

66 KV Ckt Raghay Nabha 10 

66 KV Ckt Talwara-1 25 

66 KV Ckt Talwara-2 25 

66 KV Ckt Bhiwani Industry 20 

66 KV Ckt Focal Point Bassi Alloy 25 

66 KV Ckt Bassi Alloy 9 

66 KV Ckt T1,T4,T7 32 


120 66 KV Ckt Bharri 20 


66 KV Ckt Punjab Forge 10 

66 KV Ckt Khanna-1 27 

66 KV Ckt Khanna-2 27 

66/11 KV T/F T-1 12 



66/11 KV T/F T-2 12 

66/11 KV T/F T-3 12 


80 66 KV Ckt Sanjeev Bhatia* 5 


66 KV Ckt KC Soni* 3 

66/11 KV T/F T-1 12 

66/11 KV T/F T-2 12 

66/11 KV T/F T-3 15 

66/11 KV T/F T-4 17 

66/11 KV T/F T-6 16 

Summer/Winter 

Summer/Winter 


80/40 66KV Sirhind Ckt-1 34/14 


66KV Sirhind Ckt-2 34/14 

66/11 KV 20MVA T/F 12 

Summer/Winter 

Summer/Winter 

5 220 KV S/S Amloh 120/80 66 KV Ckt Modern Alloys 25 

66 KV Ckt Neelkanth 5 

66 KV Ckt Tanda Badha 35/10 

66 KV Ckt Bimal Alloys 25 

66/11 KV T/F T-1 15/5 

66/11 KV T/F T-2 15/10 

Summer/Winter 

Summer/Winter 

6 220 KV S/S Kharar 115/110 66 KV Ckt Morinda-1 18/16 

66 KV Ckt Morinda-2 18/15 

66 KV Ckt Badali 15/14 

66 KV Ckt PTL Majri 6 

66 KV Ckt Dera Bassi 23 

66 KV Ckt Majra 35 

7 220 KV S/S Kohara 30 T2 66/11 KV 17 

T6 66/11 KV 13 

8 220 KV S/S Sahnewal 10 220KV Railway Ckt-1,2 10 

Summer/Winter 

Winter 

9 220 KV S/S Jamsher NA/10 220KV Railway Chaheru 10 

10 220 KV S/S Goraya NA/75 220/132 KV T-1 22 

220/132 KV T-2 22 

66 KV Ckt Roorkee 14 

66 KV Ckt Dausand 8 

66 KV Ckt Uppran 9

Page-(iii) 

GGSSTP ROPAR ISLAND : Details of Lines to Opened & Re-closed 

S.No Name of Substations Details of Feeders to be disconnected 

(through Relays M1, M2) 

Details of Feeders to be 

disconnected (through 

Relays S1, S2) 

1 220 KV S/S GGSSTP Ropar 220KV GGSSTP: Mohali Ckt Nil 

220KV GGSSTP: Goraya Ckt 

220KV GGSSTP: Jamsher Ckt 

220/132 KV T/F: T-1 

220/132 KV T/F: T-2 

2 220 KV Sub Station Gobindgarh G-1 220KV Gobindgarh G-1 : Ablowal Ckt-1 66 KV Ckt Amloh Road-1 

220KV Gobindgarh G-1 : Ablowal Ckt-2 

220KV Gobindgarh G-1 : Ikolaha 

3 220 KV Sub Station Gobindgarh G-2 220 KV Gobindgarh G-2: Ganguwal Ckt-1 66 KV Ckt Grain Market 

220 KV Gobindgarh G-2: Ganguwal Ckt-2 66 KV Ckt Bharri 

66 KV Ckt Punjab Forge 

66 KV Ckt Khanna-1 

66 KV Ckt Khanna-2 

66/11 KV T/F T-1 

66 KV Ckt Badinpur 

66 KV Ckt Amloh Road-1 


66 KV Ckt Central 

66/11 KV T/F T-2 

66/11 KV T/F T-3 

Remarks 

Ckt will be operative in winter 

Ckt will be operative in winter 

Annexure-IB 


66 KV Ckt Chorwala 

66 KV Ckt Amloh 

66 KV Ckt Joti Bansal 

66 KV Ckt Modern Steel 66 KV lines to be tripped, if required after time 

66 KV Ckt Dutt Multi delay of 300 milli-seconds upto 2 seconds at 47.7 

66 KV Ckt Aman Hz to provide stability 

66 KV Ckt Raghay Nabha 

66 KV Ckt Talwara-1 

66 KV Ckt Talwara-2 

66 KV Ckt Bhiwani Industry 

66 KV Ckt Focal Point Bassi Alloy 

66 KV Ckt Bassi Alloy 

All 66 KV lines to be tripped by S-1/ S-2 relays at 

47.7 Hz. 

df/dt already installed on 66 KV Grain Market, 66 

KV Central & 66 KV Badinpur feeders

Page-(iv) 

GGSSTP ROPAR ISLAND : Details of Lines to Opened & Re-closed 

4 220 KV Sub Station Gobindgarh G-3 Nil 66 KV Ckt-1 G2 

66 KV Ckt-2 G2 

66 KV Ckt Sanjeev Bhatia* 

66 KV Ckt KC Soni* 



66/11 KV T/F T-1 tot T-6 

5 220 KV S/S Amloh 220 KV Amloh : 220 KV Ckt Malerkotla 66 KV Ckt Modern Alloys 

66 KV Ckt Neelkanth 

66 KV Ckt Amloh Road 

66 KV Ckt Gobindgarh 

66 KV Ckt Tanda Badha 

66 KV Ckt Bimal Alloys 

66/11 KV T/F T-1, T-2 

6 220 KV S/S Kharar 220 KV Kharar: 132 KV Ckt Ropar Nil 

220 KV Kharar: 220 KV Ckt Mohali-1 Nil 

* These lines will be reclosed at 51.00 Hz 

Annexure-IB 

All 66 KV lines to be tripped by S-1/ S-2 relays at 

47.7 Hz 

66 KV lines to be tripped, if required after time 

delay of 300 milli-seconds upto 2 seconds at 47.7 

Hz to provide stability 

7 220 KV S/S Kohara 66 KV Ckt Allied Industry* Nil 

66 KV Ckt Chaunta Bhaini Sahib* 

66 KV Ckt Mahalaxami* 

66/11KV T/F T-3 & T/F T-4 

8 220 KV S/S Sahnewal 220 KV Sahnewal : 220 KV Ckt Lalton-1 Nil 

220 KV Sahnewal : 220 KV Ckt PGCIL 

220 KV Sahnewal : 220 KV Ckt Doraha-1 

220 KV Sahnewal : 220 KV Ckt Doraha-2 

220KV Bus Coupler 

9 220 KV S/S Jamsher 220 KV Jamsher : 220 KV Jalandhar-1, 2 Nil 

(For Winter Only) 

220 KV Jamsher : 220 KV Rehana Jattan 

220 KV Jamsher : 220 KV Mahilpur 

220 KV Jamsher : 220 KV Sultanpur-1, 2 

220 KV Jamsher : 220 KV Kotla Junga-1, 2 

220/66 KV T/F: T-1, T-2 

10 220 KV S/S Goraya Nil Nil 

(For Winter Only) 

All 66 KV lines /T/Fs to be tripped by S1/S2 relays 

at 47.9 Hz 

* These 66KV lines will be reclosed at 50.50 Hz 

RTP-Jamsher Ckt will be opened from Jamsher End 

in Summer 

RTP-Goraya Ckt will be opened from Goraya End in 

Summer

Guj Ambuja Ropar Asron 

Annexure-I C 

GGSSTP, Ropar 

Islanding Scheme 

755 MW 

B.C. 

132 kV Bus Bars 

ILK – 100 MVA, 220kV/132 kV 

ILK – 100 MVA, 220kV/132 kV 

Mohali 

Kharar 

115 MW-PADDY 

110 MW NON PADDY 

GG-4 

80 MW PADDY 

40 MW NON PADDY 

GG-3 

80 MW 

GG-2 

125 MW 

GG-1 

200 MW 

Goraya 

75 MW in non 

paddy season 

Jamsher 

Only Railway 

Load 

Sahnewal 

No Load 

Kohara 

30 MW 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

B.C.-2 


B.C.-1 

v

Amloh Rd1 Amloh Rd2 Chorwala Amloh Joti Bansal 

Modern Steel 

DLT Multi 

Aman 

Raghav 

Nabha Talwara - 1 Talwara - 2 Bhawani Ind Focal Point Bassi Alloy 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

66 kV lines to be tripped after time delay of 300 ms to provide stability 

T-1 

110 A 

T-4 

110 A 

T-7 

110 A 


G-1 & G-4 (280 MW = 200+80 PADDY 

200+40 MW NON PADDY) 

UFR (48.2 Hz) installed here to be shifted to Mohali S/S 

T2, 100 MVA, 220kV/66 kV 

T5, 100 MVA, 220kV/66 kV 

T6, 100 MVA, 220kV/66 kV 

RTP 4 RTP 3 Patiala 2 Patiala 1 Amloh RTP 2 Ikolaha 

RTP 1 GG 2-Ckt2 GG 2-Ckt1 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

B.C 


vi 

220 kV S/S G-4 

(80 MW)

D1 – df/dt relay, already installed(controls 105 MW load). To be provided ‘OR’ Logic for tripping at 47.7 Hz 

D1 D1 D1 

Grain Market Bharri Pb. Forge Khanna-I Khanna-2 66/11 kV T-1 Badinpur Amloh Rd-1 Amloh Rd-2 Central 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

66/11 kV T2 66/11 T-3 

S1/S2 

47.7 Hz 


G-2 (125 MW=230-105) 

T1, 100 MVA, 220kV/66 kV 

T5, 100 MVA, 220kV/66 kV 

Ganguwal 1 Ganguwal 2 

T-N, 100 MVA, 220kV/66 kV 

G2-G1 Link1 

G2-G1, Link2 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 


vii

Chorwala 

UFR – 48.8 Hz 

Already 

installed 

42 MW 

G2 Ckt-1 

G2 Ckt-2 

Sanjiv 

Bhatia 

KC Soni 

G1 Ckt-2 

G1 Ckt-1 

T-1 T-2 T-3 T-4 T-6 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

Re-close 

LILO G-2 LILO G-1 

S1/S2 

Re-close 

66 kV Lines will re-close (S1/S2 & S1/S2)at 51.0 Hz 

Reclosing load to be 4 to 5 MW per feeder 

T6, 100 MVA, 220kV/66 kV 

G-3 (122- 42= 80 MW) 

T-5, 100 MVA, 220kV/66 kV 

66 kV Bus Bar 

220 kV Bus Bar 

viii

D2 – df/dt relay, already installed. 

D2 D2 D2 

Sahnewal-1 Sahnewal-2 Kanganwal-1 Kanganwal-2 

Latala 

UFR-48.8 Hz 

Kohara Avery Garg Vallabh 

Sportking 

66/11 kV T-2 66/11 kV T-5 


Sahnewal (Only Railway load) 

T1, 100 MVA, 220kV/66 kV 

T4, 100 MVA, 220kV/66 kV 

Bus-I will remain charged for 

redundancy of supply at Kohara 

T3, 100 MVA, 220kV/66 kV 

Lalton 1 

PGCIL,Lalton 

Railway Ckt. 2 

Railway Ckt. 2 

Kohara 

RTP 

Doraha-1 

Doraha-2 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

220 kV Bus I 

B.C at 47.9 Hz 

M1/M2 


220 kV Bus II 

No Load – Except Railways 

ix

Load of 66/11 kV Power T/F’s T-2 & T-6 is 30 MW 

M1/M2 

47.9 Hz 

Allied Industry 

M1/M2 

47.9 Hz 

Chaunta-Bhaini 

Sahib 

M1/M2 

47.9 Hz 

Mahalauxmi 

T2, 66/11 kV T3, 66/11 kV T4, 66/11 kV T6, 66/11 kV 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

S1/S2 

Re-close 

S1/S2 

Re-close 

66 kV Lines will re-close (S1/S2 & S1/S2)at 50.5 Hz 

Time delay in ‘ms’ between lines (30 MW) 

Kohara (120- 90 = 30MW) 

T1, 100 MVA, 220kV/66 kV 

T-5, 100 MVA, 220kV/66 kV 

66 kV Bus Bar 

RTP 

Sahnewal 


x

Bhadson 

Modern Neelkanth Amloh Road Gobindgarh 

UFR – 48.8 Hz 

17 MW 

Tanda Badha Bimal Alloys 66/11 kV T-1 66/11 kV T-2 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 


Gobindgarh-1 

T3, 100 MVA, 220kV/66 kV 

Amloh (137-17= 120 MW PADDY 

55 MW NON PADDY) 

Malerkotla 

M1/M2 

47.9 Hz 

At Malerkotla 

T4, 100 MVA, 220kV/66 kV 

Load Shedding schemes to 

Be installed for redundancy- 

Operation at 47.7 Hz with 

time delay to sustain the island 


xi

Ropar 

GGSSTP Mohali 1 


M1/M2 

47.9 Hz 220 kV Bus Bar 

M1/M2 

47.9 Hz 

16/20 MVA, 132kV/66 kV 

100 MVA, 220 kV/66 kV 100 MVA, 220 kV/66 kV 

Kharar (120 MW PADDY 


66 kV Bus Bar 

Morinda-1 

Morinda-2 

Badali Mohali PTL Majri Dera Bassi Majra 

xii

66kV Bus 

100 MVA 220/66 KV 

Power Transformers (2) 

Jamsher 

Only Railway Load 

220 kV Bus coupler 

220 kV Bus 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

Sultanpur-1 & 2 

Jalandhar-1 Jalandhar-2 Rehana Jattan Mahilpur 

GGSSTP Ropar 

Railway 

Goraya 

Kotla Junga- 1 & 2 

xiii

GORAYA (75 MW NON PADDY LOAD) 

220 KV GGSSTP Ropar 220 KV Jamsher 

220 kV Bus Bar Three UFR’s TO BE DISABLED DURING NON PADDY SEASON 

M1/M2 

47.9 Hz 

100 MVA, 220kV/132kV 

POWER Transformers 

100 MVA, 220 kV/66 kV 


25 MVA, 132 kV/33kV 

& 2 nos 20 MVA 132/11 KV 

Power Transformers 

Phillaur Nurmehal Nawan Shehar Jamalpur 

Remains off 

from other end 

Phagwara 1 & 2 


33 KV Muthadda 

Dosanjh Kalan Rurka Appra 

xiv


ISLANDING - II 

GNDTP& GHTP 

ISLANDING SCHEME 

11

5.2 GNDTP, BATHINDA AND GHTP LEHRA MOHABAT ISLANDING SCHEME 

This island shall include GHTP Lehra Mohbbat & GNDTP, Bathinda. 

Initially two Units of GNDTP (2x110 MW) and three Units of GHTP Lehra 

Mohabat ( 2x210 + 1x250MW) are proposed under stage-1 (when the 

frequency comes down to 47.9 Hz). Total ex-bus generation equals to 800 

MW considering availability of two units of GNDTP (2x110 MW) and three 

units of GHTP Lehra Mohabat ( 2x210 + 1x250MW).The corresponding 

average load for island scheme @ 80% of 800 MW comes to 640 MW. The 

generation availability is considered as same during peak and off peak 

periods. 

DETAIL OF SUBSTATION WISE LOADS FALLING IN THE GNDTP-GHTP 

ISLAND(S) 

Name of S/S Avg. Load Summer Avg. Load Winter 

220 KV S/S GNDTP (Local Load) 105 MW (GNDTP) 75 MW(GNDTP) 

132 KV S/S IGC 55 MW(GNDTP) 45 MW(GNDTP) 

132 KV S/S Maur NA 40 MW(GNDTP) 

220 KV S/S GHTP (Local Load) 170 MW(GHTP) 130 MW(GHTP) 

220 KV S/S Himmatpura 135 MW(GHTP) 55 MW(GHTP) 

220 KV S/S Bajakhana 120 MW(GHTP) 55 MW(GHTP) 

220 KV S/S Barnala (PSTCL) 55 MW(GHTP) 40 MW(GHTP) 

220 KV S/S Mansa NA 125 MW(GHTP) 

220 KV S/S Jhunir NA 75 MW(GHTP) 

Total (GNDTP + GHTP) 640 MW 640 MW 

Details of sub stations wise load /feeders to be covered for load generation 

balance in the island is as per Annexure-IIA 

12

DETAILS OF LINES TO BE OPENED UNDER GNDTP BATHINDA ISLAND 

-I 

220KV GNDTP: Baluana Ckt (At Balluana) (remain in island during winter) 

132 KV IGC- Maur Line (at IGC S/S) (remain in island during winter) 

66 KV Vardhman (At IGC S/S) (remain in island during winter) 

66 KV Kot Shamir (At IGC S/S) (remain in island during winter) 

220 KV GNDTP: NFL 1 & 2 (remain in island during winter) 

220 KV GNDTP: MES 

220KV GNDTP: 220 KV Mukatsar-1 Ckt (At Muktsar) 

220KV GNDTP: 220 KV Mukatsar-2 Ckt ( At Malout) 

DETAILS OF LINES TO BE OPENED UNDER GHTP ISLAND II 

220KV GHTP: Mansa 1 & 2 (at Mansa) (remain in island during winter) 

220KV Bajakhana- Moga (Bajakhana end) 

220KV Bajakhana- Muktsar (Bajakhana end) 

220KV GHTP- Barnala (BBMB) 

220KV Barnala (PSTCL)- Barnala (BBMB) 

220 KV Barnala (PSTCL)- 220 KV Malerkotla Ckt (at Malerkotla) 

220 KV Mansa - 220 KV Refinery Ckt-1 and Ckt-2 

AT 220 KV BARNALA (PSTCL) 

66 KV Tapa 

66 KV Pakhoke 

66 KV Dhaula (UFR already installed) 

66 KV VarIndera 

66 KV Dhanaula 1 & 2 

66 KV Abhishek 

66 KV Thuliwal (UFR already installed) 

66 KV Malwa 

66 KV Bus Coupler 

Detail of lines to be opened and re-closed at various sub stations is as per 

Annexure-IIB. 

Detail indicating locations of relays is given as per schematic diagram 

attached as Annexure-IIC 

Stage II Island Operations: 

If the frequency further falls below 47.7 Hz, it is proposed to further 

disintegrate this large island into two islands with each generating station 

catering to its connected load. 

13

Details of Load to be met :- 

Page-(i) 

Sr.No. Name of Plant Details of area to be fed Summer 

Load 

Winter 

Load 

Relief 

from 

UFRs(in 

MW) 

Relief 

from df/dt 

relays(in 

MW) 

Relief 

from SPS 

(in MW) 

G. Total 

Load 

relief(MW) 

Annexure-IIA 

Net 

Demand to 

be met 

Gross Total 

Generation(MW) 

Generation considered for 

islanding purpose(MW) 

(MW) (MW) Paddy 

Load 

Paddy 

Load 

Paddy 

Load 

Paddy Load 

(MW) 

1(i) GNDTP,Bathinda 2x110-20=200 220KV S/S Bathinda (Local Load) 105 75 0 0 0 0 640 

4x110=440MW 132KV S/S IGC 55 45 0 0 0 

132KV S/S Maur NA 40 

(ii) GHTP, LehraMohabat 2x210+1x250-70=600 220KV S/S LehraMohbat (Local 170 130 0 0 0 

Load) 

(920MW) 220KV S/S Himatpura 135 55 0 0 0 

220KV S/S Bajakhanna 120 55 0 0 0 

G. Total (i)+(ii) = 1360 G. Total (i)+(ii) = 800 220KV S/S Barnala(PSTCL) 55 40 0 0 0 

220KV S/S Mansa NA 125 

220KV S/S Jhunir NA 75 

80% of G.Total = 640MW Total (MW) 640 640 0 0 0 

2 GNDTP, Bathinda 160 220KV s/s Bathinda 105 75 0 0 0 0 160 

4x110=440MW (i.e 80 % of 2x110) 132KV s/s IGC 55 45 0 0 0 

132KV S/S Maur NA 40 

Total (MW) 160 160 0 0 0 

3 GHTP, LehraMohabat 480 220KV s/s LehraMohbat (Local 170 130 0 0 0 

Load) 

220KV Himatpura 135 55 0 0 0 

220KV s/s Bajakhanna 120 55 0 0 0 0 480 

(920MW) 

(i.e. 80% of (2x210+1x250- 220KV s/s Barnala(PSTCL) 55 40 0 0 0 

70=600)) 

220KV S/S Mansa NA 125 0 0 0 

220KV S/S Jhunir NA 75 0 0 0 

Total (MW) 480 480 0 0 0 480

Page-(ii) 

Details of Break-up of Load to be met :- 

Annexure-IIA 

S.No Name of Substations Load (MW) BREAK-UP OF LOAD Load(MW) 

Summer/Winter 

Summer/Winter 

1 220 KV S/S GNDTP Bathinda 105/75 220/66KV 1X100 MVA T/F 70/45 

66 KV C-Compound 15/10 

66 KV MES(Cantt.) 20 

2 132KV S/S IGC Bathinda 55/45 66 KV Dabwali Road 32/26 

132/11 KV T/F 8/4 

66 KV Vardhman 9 

66 KV Kot Shamir 6 

3 132 KV S/S Maur NA/40 132/66 KV T/F T-1 12 

132/66 KV T/F T-2 12 

132/66 KV T/F T-3 8 

132/66 KV T/F T-4 8 

3 220 KV Sub Station GHTP Lehra 170/130 66 KV Rampura 40/30 

66 KV Phul 30/20 

66 KV Blucho 25/20 

66 KV Nathana 25/20 

66 KV Bhai Rupa 35/27 

66 KV Lehra Mohabbat 2/2 

66 KV Vikram Cement 7/7 

66 KV Balianwala 6/4 

4 220 KV Sub Station Himmatpura 135/55 66 KV Ckt Bahadur 30/10 

66 KV Ckt Bilaspur 30/12 

66 KV Ckt Patto Hira Singh 25/8 

66 KV Ckt Dina Sahib 20/10 

66 KV Ckt Tallewal 20/10 

220/66 KV T/F: T-2 10/5 

5 220 KV S/S Bajakhana 120/55 66/11 KV T-2 9/4 

66/11 KV T-3 10/6 

66 KV Maluka 4/3 

66 KV Jaito 24/10 

66 KV Bhagta 38/20 

66 KV Jeeda 15/5 

66 KV Bargari 20/7 

6 220 KV S/S Barnala PSTCL 55/40 66/11 KV T/F T-4 10/6 

66/11 KV T/F T-5 15/11 

66 KV Barnala Ckt. 30/23 

7 220 KV S/S Mansa NA/125 66 KV Budhlada-1 8 

66 KV Budhlada-2 8 

66 KV Joga 8 

66 KV Dhalewan 6 

66 KV Bhikhi 10 

66 KV Maur 15 

66/11 KV T/F T-3 35 

66/11 KV T/F T-4 35 

8 220 KV S/S Jhunir NA/75 66 KV Sardulgarh 14 

66 KV Aalike 11 

66 KV Mansa 40 

66/11 KV T/F 10

Page-(iii) 

GNDTP BHATINDA AND GHTP LEHRA MOHABAT ISLAND : Lines/Bays to be opened & re-closed 

S.No Name of Substations Details of Feeders to be disconnected (through Details of Feeders to be disconnected 

Remarks 

Relays M1, M2) 

(through Relays S1, S2) 

1 220 KV S/S GNDTP Bathinda 220KV GNDTP: 132 KV Baluana Ckt 220 KV GNDTP: 220 KV GHTP Ckt-1 132KV Baluana, NFL-1,2, Cantt & 132 KV IGC Ckts will remain 

220KV GNDTP: 220 KV Mukatsar-1 Ckt 

220 KV GNDTP: 220 KV GHTP Ckt-2 operative during winter season 

220KV GNDTP: 220 KV Mukatsar-2 Ckt (Malout) 220 KV GNDTP: 66 KV C-Compound 

220KV GNDTP: 132 KV NFL-1 220 KV GNDTP: 66 KV MES(Cantt.) Tripping after time delay of 0.5 seconds 

220KV GNDTP: 132 KV NFL-2 

Tripping after further time delay of 0.5 sec (total 1 sec) 

220KV GNDTP: 132 KV Cantt 

2 132KV s/s IGC Bathinda 132 KV IGC: 132 KV Maur 132 KV IGC: 66 KV Dabwali This Ckt will be operative during winter season 

132 KV IGC: 66 KV Kot Shamir -do- 

132 KV IGC: 66 KV Vardhman(Mahavir) -do- 

-do- 

Annexure-IIB 

3 220 KV Sub Station GHTP Lehra 

Mohabat 

220 KV GHTP: 220 KV Barnala BBMB Ckt 66KV ckt BTI Thermal 1* * All 66 KV lines to be tripped by S-1/ S-2 relays at 47.7 Hz to 

sustain the island 

66KV ckt BTI Thermal 2* 

4 220 KV Sub Station Himmatpura Nil 66 KV Ckt Bahadur** 

66 KV Ckt Bilaspur** 

66 KV Ckt Patto Hira Singh** 

66 KV Ckt Dina Sahib** 

66 KV Ckt Tallewal** 

220/66 KV T/F: T-2** 

5 220 KV S/S Bajakhana 220 KV Bajakhana: 220 KV Ckt Mukatsar Nil 

220 KV Bajakhana: 220 KV Ckt Moga Nil 

6 220 KV Sub Station Barnala PSTCL 220KV Barnala : 220KV Malerkotla ckt 1 66/11KV KV T/F: T-4* 

220KV Barnala : 220KV Malerkotla ckt 2 

66/11KV T/F: T-5* 

220KV Barnala(PSTCL)-220KV Barnala(BBMB) 66 KV Ckt Barnala* 

220KV Barnala : 66 KV Pakhoke Ckt 

220KV Barnala : 66 KV Tapa Ckt 

220KV Barnala :66KV Ckt Varindra 

66 KV lines to be tripped, if required after time delay of 300 milliseconds 

upto 2 seconds at 47.7 Hz to provide stability 

** These lines will be reclosed at 51.00 Hz 

* All 66 KV lines to be tripped by S-1/ S-2 relays at 47.7 Hz to 

sustain the island 

220 KV Barnala: 66 KV Abhishek 

220KV Barnala : 66 KV Malwa ckt 

220KV Barnala : 66 KV Bus coupler 

7 220 KV S/S Mansa 220 KV Mansa: 220 KV Refinery Ckt-1 Nil 

220 KV Mansa: 220 KV Refinery Ckt-2 

220 KV Mansa: 220 KV GHTP Ckt-1 220 KV Ckt will be operative during winter season 

220 KV Mansa: 220 KV GHTP Ckt-2 -do- 

7 220 KV S/S Jhunir (for Winter) 220 KV Jhunir: 220 KV Mansa Nil

GNDTP (160 MW) Islanding Scheme 

Annexure-II C 

B.C. 



B.C. 

40/50 MVA, 132kV/66 kV 

25 MW 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

16/20 MVA, 132kV/66 kV 

10 MW 

Cantt NFL-2 NFL-1 Balluana 

Auto T/F 

Leh-2 Leh-1 Muktsar Malout 

IGC 

All these relays will be disabled in non paddy 

season 

Auto T/F 

100 MVA, 220kV/66 kV 

70 MW 


Coupling 

M1/M2 

47.9 Hz 

132 KV IGC 

132/11 KV (8 MW) 

66 kV Bus Bar 

M1/M2 

47.9 Hz 

Installed at IGC S/S 

66KV Kot Shamir 66 KV Mahavir 

M1/M2 

47.9 Hz 

Maur 

All these relays will be disabled in non paddy season 

66 KV Dabwali Road 

S1/S2 at 47.7 Hz 

32 MW 

66 KV MES (20 MW) 

At 47.7 Hz with TD of 1 sec 

S1/S2 

iv 

66 KV C-Compound (15 MW) 

At 47.7 Hz with TD of 0.5sec 

SI/S2

Rampura Phul 

Bhucho 

Nathana Bhai Rupa 

Lehra 

Mohabbat 

Vikram 

Cement 

Balianwala 

B.C 


T1, 100 MVA, 220kV/66 kV 

85 MW 

Lehra Mohabbat – Island of 480 MW 

(Local Load170 MW PADDY & 130 MW NON PADDY) 

At Mansa end 

To be disabled in 

non- paddy season 

Mansa 1 Mansa 2 Himmatpura Himmatpura 2 

167.5 MW 67.5 MW 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

PSTCL, Barnala 

55 MW 

T2, 100 MVA, 220kV/66 Kv 

85 MW 

BTI Thermal 1 

Bajakhana 1 Bajakhana 2 

S1/S2 47.7 Hz 

BTI Thermal 2 

60 MW 60 MW 

S1/S2 47.7 Hz BBMB, Barnala 

B.C 


B.C 

v

Bhadaur 

Bilaspur 

Patto Hira 

Singh 

Dina Sahib 

Tallewal 

66/11 kV T-2 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

S1/S2 

Re-close 

S1/S2 

Re-close 


S1/S2 

Re-close 

66 kV Lines will re-close (S1/S2) at 51.0 Hz- Reclosing load to be 4 to 5 MW 

66 KV lines will trip after delay at 47.7 Hz 

T1, 100 MVA, 220kV/66 kV 

T3, 160 MVA, 220kV/66 kV 

Himmatpura (135 MW PADDY 


Lehra 1 

Lehra 2 

B.C 


vi

12.5 MVA, 66 kV/11 kV 

12.5 MVA, 66 kV/11 kV 

Maluka Jaito Bhagta Jeeda Bargari 

66 kV Bus Bar 

T1, 100 MVA, 220kV/66 kV 

T2, 100 MVA, 220kV/66 kV 

Bajakhana (120 MW PADDY 


GHTP 1 GHTP 2 

Mukatsar Moga 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 


vii

66/11 kV T-4 

66/11 kV T-5 

Varindra 

Dhanaula-1 

Dhanaula-2 

Thuliwal 

UFR- 48.8 Hz Abhishek Malwa Barnala 

S1/S2 

47.7 Hz 

S1/S2 

47.7 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

S1/S2 

47.7 Hz 

B.C at 47.9 Hz 

M1/M2 


T1, 100 MVA, 220kV/66 kV 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

PSTCL, Barnala (190 MW= 135+55 

NET 55 MW PADDY & 40 MW NP) 

At Malerkotla end 

T2, 100 MVA, 220kV/66 kV 

T1, 100 MVA, 220kV/66 kV 

Pakhoke 

Dhaula 

UFR- 48.8 Hz 

Tapa 

Malerkotla 1 Malerkotla 2 BBMB, Barnala 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 47.9 Hz 

Along with 

PSTCL bus 

sectionalizing 

220 KV breaker 

B.C 


viii

Budhlada 

Ckt-1 

Budhlada 

Ckt-2 

Joga 

Dhalewan 

Bhikhi 

Maur 

66/11 kV T-3 66/11 kV T-4 


T1, 100 MVA, 220kV/66 kV 

T5, 100 MVA, 220kV/66 kV 

Mansa (125 MW 

Non Paddy load Only) 

T2, 100 MVA, 220kV/66 kV 

Relays to be disabled 

In non paddy season 

Jhunir 

Refinery Ckt. 1 

Refinery Ckt. 2 

Lehra 1 

Lehra 2 

Sunam 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

M1/M2 

47.9 Hz 

B.C 


ix

Mansa 

Sunam 

M1/M2 

47.9 Hz 


JHUNIR 

75 MW 

NON PADDY LOAD 

100 MVA, 220 kV/66 kV 


B.C 

Sardulgarh 

Aalike 

66 KV Mansa 

20 MVA 

Power T/F 

x

CHAPTER-6 

6.0 PROPOSED ACTION PLAN FOR SUCCESSFUL 

IMPLEMENTATION AND SURVIVAL OF ISLANLANDING 

SCHEME 

The islanding scheme is designed for a typical load-generation balance under 

summer and winter load scenario. However, considering system dynamics 

and actual load conditions, it creates un-certainties in the survival of the 

islands. Initially the islanding scheme as discussed in Chapter-5 can be 

implemented with the deployment of frequency sensing relays but additional 

measures would be required over a period of time to enhance success rate of 

islanding scheme. 

The following steps are proposed to be taken to enhance probability of 

success & survival of islanding scheme:- 

6.1 Deployment of Numerical Relays. 

State of the art Numerical relays (Under frequency cum df/dt) shal l be 

provided at the identified locations, which shall have faster response time. 

The existing static UFR & df/dt relays at the Island locations shall also be 

replaced with digital numerical relays. The relay shall be capable to integrate 

with existing/upcoming optical fiber communication network , under ULDC 

scheme. Detailed Technical specifications and Bill of Material is given as 

Annexure III & IV respectively. 

6.2 Intelligent System for Load Shedding & Remote Monitoring. 

An intelligent system through existing or stand alone SCADA system will be 

implemented to continuously monitor the generation (including governor 

response of the generating units) and load at sub stations forming part of 

respective island (s), on real time basis and decision in the formation of island 

as well as during the restoration process. The intelligent system shall have 

central control and command centre at SLDC The system will necessarily 

require optical fiber based communication network. Such intelligent system 

would enhance the reliability of formation of islands. Detail status of 

connectivity & RTUs installed at Substations is given as per Annexure-V. 

Till such time the above intelligent system is developed, the proposed scheme 

based on Numerical Relays shall be in place. 

14

6.3 Network & Simulation Studies. 

To assess stability and re-validate the formation of proposed islands under 

different scenario, Dynamic network simulation studies and stability analysis 

would be required beforehand. The study would analyze degree of swings in 

the bus voltages, line flows and relative rotor angles, etc. The studies would 

also suggest any additional measures to be taken for enhancing success rate 

of islanding. Line network diagram of system showing boundary of islands is 

given as Annexure VI. 

6.4 Regular preventive Maintenance. 

In order to ensure reliability of the island, regular preventive maintenance of 

control switchgears, relays & protection system and governors at each of the 

generating units, as covered in the scheme, shall be carried out by the 

respective agencies. 

6.5 Additional Requirements: 

Any additional provision to meet with the functional requirements of the 

Scheme shall be incorporated during implementation stage. 

6.6 Periodic Review of islanding scheme. 

The islanding scheme shall be reviewed periodically, at least once a year, by 

the SLDC in consultation with the utilities. Changes in system topology, 

loading conditions, generation/demand growth, etc shall be reviewed and 

necessary changes in the islanding scheme shall be made accordingly. 

6.6 Training and mock drills 

The detailed procedures/instructions shall be developed and training shall be 

imparted to the System Operators at SLDC and other personnel involved at 

the sub stations and generating stations. A detailed mock drills shall be 

conducted regularly, at least once in a year. SLDC shall co-ordinate this 

activity with the utilities. 

15

CHAPTER-7 

7.0 MAJOR CHALLENGES AND WAY FORWARD 

7.1. The islanding scheme has been framed considering the current power 

scenario in summer /paddy and winter season. Whereas system is heavily 

loaded and most vulnerable to instability and grid disturbance during summer 

peak period ( June-Oct), the system is equally vulnerable during winter 

season particularly under foggy conditions ( Dec-Feb), as experienced in the 

past. To make the islanding scheme suitable for all possible power scenario 

through out the year and changes in the network, this shall require a regular 

review and re-adjustments. 

7.2. Maintaining the island will require continuous actions to regain and thereafter 

maintain load generation balance in the respective islands. Since frequency 

excursion in islands are expected to fast paced, these actions will 

permanently be ensure automatically through time delay feature. 

7.3 Presently RFGMO at the generation stations operates within limit of +/- 5%, 

as per the IEGC which is already built in the control system of 

generator/Turbine. In case of wide range of variation of frequency control 

,under proposed islanding mode, one generating unit will have to be operated 

on frequency control mode, for which assistance of BHEL(OEM) is required. 

7.4 Introducing time delay of 5 seconds in the frequency tripping of generating 

units included in the islands shall enhance success rate of islands. 

7.5 Training and Mock Drills at SLDC, sub stations and Generating Stations to 

familiarize for handling real time situation during grid disturbance. 

7.6 During the islanded operation of system, Punjab SLDC at Ablowal, Patiala will 

be the nodal agency who will have the overall responsibility of co-ordination & 

operation of the islanded systems with various agencies like generating/ 

distribution licensees (PSPCL/IPPs), B BMB and POWERGRID etc. Punjab 

SLDC will follow instructions issued by NRLDC. 

16

ANEXURE III 

TECHNICAL SPECIFICATION OF UFRs : 

The broad technical specification of islanding relays for the proposed load 

shedding scheme is as under: 

a. Rating: 

The rated auxiliary voltage : 220V + 5% (D.C)., 

The rated system frequency: 50 Hz 

Nominal voltage : 110V (A.C). Phase-Phase from P.T’s. 

b. Operating frequency range : 45 to 55 Hz in steps 0.1 Hz with accuracy + 10 mHz. 

c. Under Voltage block at 40% of P.T. Voltage. 

d. Recovery function: Frequency difference from set value 0.1 to 2.0 Hz. Resetting 

time – 15 Sec. to 15 minutes. Accuracy + 1%. 

e. The relays should be immune to harmonics & transients. 

f. It should have feature to self monitor. It should also be possible to monitor the 

relay from remote. 

g. The relay should have at least 4 levels of settable under frequency levels. 

h. The relay should have at least 2 levels of settable over frequency levels. 

i. The relay should have three load shedding stages for df/dt function and each 

stage should have setting range of 0.1 to 3 Hz (incremental in steps of 0.1 

Hz/Sec). 

j. The each output contact of relays shall be configurable based on frequency 

whether over and under frequency values. 

k. The relay shall be IEC 61850 Compliant and shall communicate with SCADA 

system located at a remote location through owner communication network 

through 2mbps Ethernet port. 

l. The relay shall have at least four (4) voltage inputs where PT can be 

connected directly without any additional interfacing equipment. 

m. The relay shall have at least 12 status input and 6 trip output contacts to trip 

at least 6 feeders & monitor Main & Tie CBs of these 6 feeders. The output 

contacts shall be wired to self reset heavy duty trip relays to trip Main & Tie 

17

CBs & send direct trip command to remote end. Heavy duty trip relay shall 

have at least 8 contacts. 

n. The relay shall monitor the operation of circuit breaker through its auxiliary 

contacts. 

o. The accuracy of Frequency measurement shall be 1% or better. 

p. Suitable LED’s for indications of Tripping, Alarm & Healthy condition. 

q. The relay shall have self-supervision function. 

r. The maximum operating time (including tripping time) should not exceed 50ms. 

s. If the relay or its LED’s or contacts are programmable, they would be programmed by 

the firm according to PSTCL requirements / drawings before delivery. 

t. The relay shall be capable of fault recording which shall record all analogue 

and digital data wired to relay. 

u. The relay shall have time synchronising feature using SNTP and IRIG B both. 

v. 2 nos. under frequency relays from different makes are envisaged for each 

EHV station which will be connected to bus CVT/PT separately to have 

redundant relaying system. 

w. One spare contact of the U/F islanding relay/trip relay shall be wired to existing RTU /RMU 

in the substations of the Islanding scheme for intimation of Islanding commencement to 

RLDC/SLDC 

18

Annexure IV 

BILL OF MATERIAL (UFRs) 

Name of Sub-station Relays M1 Relays S1 Total for each S/S 

GGSSTP, Ropar 1 0 1 

G-1 & G-4 1 4 5 

G-2 1 2 3 

G-3 0 3 3 

GNDTP 2 2 4 

IGC Bathinda 1 1 2 

Himmatpura 0 2 2 

Mansa 1 0 1 

Sahnewal 1 0 1 

Kohara 1 1 2 

Amloh 0 2 2 

Kharar 1 0 1 

BBMB, Barnala 1 0 1 

Bajakhana 1 0 1 

PSTCL, Barnala 3 1 4 

Jhunir 1 0 1 

Mohali, Malerkotla 2 2 

Goraya, Jamsher 3 3 

TOTAL M1 21 

TOTAL M2 21 

Total S1 18 

Total S2 18 

Net Total 78 

20% extra 16 

TOTAL 94 

19

Annexure-VI 

Status of Connectivity & RTU availability at locations under Islanding Scheme 

S. 

No. 

Name of Sub-Station 

SCADA/RTU 

Availability 

Optical Fiber 

Connectivity 

Remarks 

1. 220 KV S/S GGSSTP 

2. 220 KV S/S G-1 & G-4 

3. 220 KV S/S G-2 

Yes 

(C-DAC) 

Yes 

(C-DAC) 

Yes 

(Areva) 

Yes 

Yes 

Approved 

4. 220 KV S/S G-3 No Approved 

5. 220 KV S/S Amloh No Yes 

6. 220 KV S/S Kharar No Approved 

7. 220 KV S/S Kohara No No 

8. 220 KV S/S Sahnewal 

9. 220 KV S/S Jamsher 

Yes 

(Areva) 

Yes 

(C-DAC) 

10. 220 KV S/S Goraya Yes No 

11. 220 KV S/S GNDTP 

12. 220 KV S/S GHTP 

Yes 

(C-DAC) 

Yes 

(ABB) 

13. 132 KV IGC No No 

No 

Yes 

Yes 

Yes 

RTU under 

upgradation 

DFE make RTU 

already ordered 

DFE make RTU 


DFE make RTU 


DFE make RTU 


RTU under 

upgradation 

RTU under 

upgradation 

RTU under 

upgradation 

14. 132 KV Maur No No 

15. 220 KV Himmatpura No No 

16. 220 KV Bajakhana No No 

17. 220 KV Barnala 

18. 220 KV Mansa 

Yes 

(DFE) 

Yes 

(Areva) 

19. 220 KV Jhunir No No 

Yes 

No 

Under 

Commissioning 

Under 

Commissioning 

Under 

Commissioning 

20

3*66MW 

(NHPC) 

BAIRASIUL(HP) 

(PSEB) 

SHAHPUR 

KANDI 

JASSORE 

(HP) 

6*60MW 

(BBMB) 

(HP) 

PONG 

(PSEB) 

RSD 

HIRA 

NAGAR 

(J&K) 

SARNA 

TIBBER 

DASUA 

MAJITHA 

F.G.Ch. 

KARTAR 

PUR (PSEB) 

WADALA 

GR. KHASA 

BALA CHAK 

VERPAL 

TO 

HAMIRPUR 

KANJLI 

(KPT) 

C.L.ASR 

K.S. 

MALLI 

6*115MV 

(NHPC) 

SALAL(J&K) 

JAMMU 

KISHENPUR 

WAGOORA 

PAMORA(J&K) 

(J&K) 

U.PUR(J&K) 

(NHPC) 

(NHPC) 

(PGCIL) 

(PGCIL) 

(PGCIL) 

(PGCIL) 

KISHENPUR 

KANGRA 

KANGRA(HP) 

HAMIRPUR(HP) 

SHANAN 

PATHAN 

KOT 

SARNA 

BASSI 

CHOHAL 

MAMUN 

ASHP 

(GANGUWAL) 

MAJARA 

NAKKIAN 

JADLA 

GURDASPUR 

DHARIWAL 

BATALA 

HOSHIAR 

PUR 

MHP-1 

MHP-2 

MHP-3 

MHP-4 

(PSEB) 

(PSEB) 

(HPSEB) 

(PSEB) 

(PSEB) 

TO KARTARPUR 

DEHAR 

BHAKRA(R.B.) 

BHAKRA(L.B.) 

GANGU 

WAL 

DEHAR 

PANIPAT 

BHIWANI 

CHAMERA(HP) 

GANGUWAL 

AMBUJA 

R.T.P. 

TO JAGADHRY(HR.) 

TO DHULKOT(HR.) 

(BBMB) 

(BBMB) 

(BBMB) 

(BBMB) 

(BBMB) 

(BBMB) 

(BBMB) 

HAKIMA 

GATE 

WADALA 

GRANTHIAN 

KATHU 

NANGAL 

VERKA 

TANDA 

BHOG 

PUR 

SHRI 

HAR- 

GOBIND 

PUR 

JAINTI 

PUR 

P.COLONY 

C.L.ASR 

MALL 

MANDI 

(LOHARKA) 

(PAKHAR WALA) 

GT.ROAD ASR. 

NARAIN 

GARH 

VERPAL 

SAKATRI 

BAG 

(PGCIL) KARTARPUR(JAL) 

TARN TAARAN 

KISHAN PUR 

ALAWALPUR 

JANDIALA 

TANGRA 

EKAL 

GADDA 

BHIKHI 

WIND 

PATTI 

SULTANPUR 

RASHIANA (TARAN 

TARAN) 

PATTI 

KOTLA 

JUNGA 

(PGCIL) 

(PGCIL) 

RCF 

SCIENCE 

KHERA 

MANDIR 

KAPUR 

THALA 

CITY 

CHILDREN 

PARK 

BUTARI 

DERA 

BEAS 

KARTAR PUR 

DHILWAN 

JALANDHER-1 

RAILWAY 

BUTARI 

ALGAON 

SULTAN 

PUR 

(RAILWAY) 

CHAHERU 

JAMSHER(JAL.-2) 

1*250 MVA 

PATIALA 

FAGAN MAJRA 

2*315 

MVA 

4X150MVA 

(PGCIL) 

BALA CHAK 

2*315MW 

JALANDHAR-1 

(BBMB) 

KOTLA 

ROPAR 

ASRON 

MAX 

INDIA 

DCM 

BILASPUR 

CHAMKAUR 

SAHIB 

SIHORA 

SAMSPURA 

RAILWAY 

KURALI 

GOBINDGARH-1 

GOBINDGARH-2 

AMLOH ROAD 

GOBINDGARH 

DORAHA 

GHULAL 

MES 

N.F.L. 

IGC 

ABOHAR BALUANA 

GIDARWAHA 

BADAL 

MAUR 

MUKTSAR(OLD) 

MUKTSAR 

SARAINAGA 

MUKTSAR 

(NEW) 

KOTKAPURA-1 

KOTKAPURA-2 

JALALA 

WAD 

GUBHAYA 

MALOUT 

MALOUT 

TO MANSA 

DHARAMKOT 

PANJ 

GARIAN 

BADHNI 

KALAN 

MOGA-2 

GHOLIAN 

KALAN 

BAGHA 

PURANA 

FARID 

KOT 

SADIK 

BAJA 

KHANA 

BARNALA 

AJITWAL 

JAGRAON 

SADIK 

BOTIAN 

WALA 

MASTE 

WALA 

FEROZPUR 

MOGA(PGCIL) 

(BBMB) 

MOGA 

SMADH BHAI 

BAGHA 

PURANA 

MOGA 

3*100 

MVA 

2*90 

MVA 

KHARAR 

6*210MV 

(PSEB) 

R.T.P. 

TO 

NALAGARH 

(H.P.) 

RAJPURA 

PATRAN 

RAILWAY 

DERABASSI 

LALRU 

MOHALI-II 

MOHALI 

MAJRA 

BAHADUR 

GARH 

FAGAN 

RAJLA 

ABLOWAL 

(PATIALA) 

KOHARA 

AMLOH 

SAHNEWAL 

RAILWAY 

BATHINDA 

2*110MW 

2*210 MW 

G.H.T.P. 

(PSEB) 

HIMAT 

PURA 

MANSA 

JHUNIR 

SUNAM 

DHURI 

BARNALA 

(PSEB) 

MALER 

KOTLA 

MALER 

KOTLA 

(PSEB) 

(PGCIL) 

(PGCIL) 

TO FAGAN 

MAJRA 

(NTPC) 

2*315MVA 

MALER KOTLA 

TO DADRI 

SANGRUR 

(PGCIL) 

PAKHOWAL 

FZR.RD.LDH 

FEROZESHAH 

TALWANDI 

BHAI(KOT KROR) 

FEROZPUR 

LALTON KALAN 

LUDHIANA (PGCIL) 

HAMBRAN 

JAMALPUR 

DHANDARI 

KALAN 

2*315MVA 

(PGCIL) 

LUDHIANA 

(BBMB) 

(BBMB) 

(PGCIL) 

2 

3 

100 

MVA 

MAHILPUR 

NAWAN 

SHAHAR 

MAHILPUR 

BANGA 

PHAG 

WARA 

GOR 

AYA 

NUR 

MAHAL 

NAKODER 

URBAN 

ESTATE 

JAMALPUR 

SWADI 

KALAN 

SOSAN 

MOGA-1 

(OLD) 

MOGA(NEW) 

2*110MW(UNIT#1&2) 

BATHINDA(PSEB) 

TO MAUR 

(PSEB) 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

H 

T 

T 

T 

T 

100 

MVA 

100 

MVA 

100 

MVA 

1*100 

MVA 

2* 

100 

MVA 

3*100 

MVA 

2*100 

MVA 

2*315 

MVA 

100 

MVA 

2*90 

MVA 

100 

MVA 

2*100 

MVA 

2*100 

MVA 

3*100 

MVA 

2*100 

MVA 

100 

MVA 

100 

MVA 

(0.4 SQ.") 

(BBMB) 

LINE NETWORK DIAGRAM FOR POWER SYSTEM OF PUNJAB 

220KV LINE 

765KV LINE 

132KV LINE 

400KV LINE 

RAILWAY 

IKOLAHA 

ISLAND-1 

GGSSTP 

ISLAND-2 

GNDTP & 

GHTP 

Annexure-VI

Appendix-IIIA 

( Sh 1 of 4) 

Detail of Under Frequency Relays (UFR) installed at Grid Sub-Stations. 

Sr. Name of S/Station Name of Feeder Load Relief in MVA 

No. 

P&M Circle Amritsar 

1 2202KV Khassa 66KV Attari 25 

2 220KV Patti 66KV Chohla Sahib 

25 

66KV Sarhali 

3 220KV Fatehgarh Churian 66KV Ajnala 

35 

66KV Ram Dass 

66KV Jhander 

66KV Wadala Veeram 

4 220KV Wadala Granthian 66KV Udanwal 21 

5 220KV Tibber 66KV Purana Shalla 7 

6 220KV Kotli Surat Mali 66KV Shahpur Goraya 6 

P&M Circle Jalandhar 

7 132KV Banga 66KV Rehana Jattan, 66KV Behram 65MVA 

8 132KV Jadla 66KV Balachour & Kerawar line 70MVA 

9 132KV Nawanshahar 66KV Aur & Rahon 50MVA 

10 220KV Kartarpur 66KV Nadala Hamira & Mustfapur 45MVA 

11 220KV 

66KV Malsian Alewali, Shahkot, 

153.5MVA 

Kotla Janga 

Malian & Cap, Bank 

12 132KV Bhogpur 33KV Kandhala Jattan & 33KV Bholath 34 MVA 

13 132KV Nakodar 66KV Shanker. 

( UFR relay is installed on 66KV 

Shanker feeder was shifted on 220KV 

Kotla Janga on 26/6/12) 

32.5 MVA ` 

P&M Circle Patiala 

14 220KV S/S Ablowal 66KV Lung 10.29 

15 220KV S/S Bahadurgarh 66KV Ghanour 22.86 

16 132KV Ropar 66KV Bahlolpur 7.420 

17 220KV S/S Patran 66KV Moonak 68.587 

18 

66KV Chajli 43.44 

220KV S/S Sunam 

66KV Cheema 42.75 

19 220KV S/S Dhuri 66KV Kanjla 18 

20 220KV S/S Barnala 66KV Dhaula, Thuliwal 37.5 

21 220KV Malerkotla - 

P&M Circle Bathinda 

22 220KV S/S Mansa 66KV Budhhlada ckt-I 

66KV Budhhlada ckt-II, 

66KV Bhikhi line, 

66KV Dhelwala line 

32 MVA 

32MVA 

28.57MVA 

28.57MVA 

23 220KV S/S Botianwala 100MVA T/F, 220/66KV I/C 66KV 

45 MVA 

side 

24 220KV S/S Ghubaya 66KV Ladhuka 92.5MVA 

25 220KV S/S Sadiq 66KV I/C I&II 63.8MVA 

27

26 132KV S/S Malout 66KV Abulkhurana 33MVA 

27 132KV S/S Abohar 33KV Khuhi Khera line Br, out of ckt 

28 132Kv Kotkarore 66KV Mudki line 37.5MVA 

P&M Circle Ludhiana 

29 132KV Doraha 132KV Bilaspur-Sihora line, 66KV 

68MVA 

Payal Chawa line, Setco line 

30 220KV Sahnewal 66KV Latala 20.5MVA 

31 132KV Sawadi 132/11 T/F T-1 20 MVA 

32 220KV Jagraon 66KV Sidhwan Bet & Rasulpur & 

55MVa 

Raikot 

33 220KV Gobindgarh-I 3No, 220/66KV T-1, T-2&T-3 226MVA 

34 132KV Amloh 66KV Bhadson line 55MVA 

35 220KV Dhandari-I 2x100MVA 220/66KV side 184MVA 

36 220KV Goraya 33KV Apra & Dosanj Kalan 55MVA 

37 220KV S/S Gobingarh-III 66KV Chaurwala 50MVA 

28

Appendix-IIIB 

( Sh 3 of 4) 

Detail of df /dt Relays installed at Grid Sub-Stations. 

P&M Circle Amritsar 

Sr. 

No. 

Name of S/Station Name of Feeder Load Relief in 

MW 

1. 132 KV Bhikhiwind - 48 

2. 132 KV Tarn Taran 1) 66 Kv Chola Sahib 

62 

2) 66 KV Manochahal 

3. 132 KVTangra - 11 

4. 132 KV Jandiala Guru - 13 

5. 132 KV Ekal Gadda - 6 

6. 132 KV Dhariwal 66 KV Naushera Majja Singh 12 

7. 132 KV Naraingarh 1. 66 KV OCM Ckt.I 

54 

2. 66 KV OCM Ckt.II 

3. 66 KV Gowal Mandi 

4. 66 KV Sarai Amanat Khan 

5. 66 KV Hall Gate 

8. 220 KV Civil Lines, Asr 66 KV Harsha Chhina 39 

P&M Circle Jalandhar 

9 220 KV S/Stn. Jamsher 66KV Daulatpur 50 

10 132 KV S/Stn. Nurmehal - 32 

11 132 KV S/Stn. Hoshiarpur 66KV Sadhu Ashram, 

33 

66KV Sham-84, 66KV Attowal, 

66KV Nasrala, 66KV Focal Point 

12 132 KV Bhogpur - 28 

13 132 KV Tanda - 13 

14 132 KV Alawalpur - 8 

15 220 KV Sultanpur 66KV Lohia, 66KV Jakhubal, 66Kv 

47 

Bhagobudda, 

66KV Talwandi Madho, 

66KV Talwandi Chaudhrian 

16 132 KV Kheramandir - 32 

17 132 KV Kapurthala - 17 

18 132 KV Dhilwan - 8 

P&M Circle Patiala 

19 220KV S/S Rajpura 66KV Gajjukheran Sirhind, Rajpura old, 90 

Dharamgarh 

20 220KV S/S Derabassi 66KV Wnsone yarn, Lalru, rama petro, 

91 

Nahar export, Mubarkpur 

21 132KV Chamkaur Sahib 11KV feeders 16 

22 132KV Anandpur Sahib 11KV feeders 20 

P&M Circle Bathinda 

29

23 132KV Sadiq 66KV Golewala 

66KV Sukhanwala 

66KV Guru Har sahal 

66KV Jhoke Tehal Singh 

66KV Deep Singh wala 

24 132KV Maur 66KV Talwandi Sabo 

66KV Jodh pur 

66Kv Joga Ralla 

25 132KV Sarainaga 20/10/10MVA, 132/33/11KV P/T/F 

Controlling 

33KV Wara Kishanpura 

11KV Khokhar 

11KV Waring 

11KV Hari ke Kalan 

11KV Baja Marar 

26 132KV Abohar 33KV Kaller Khera 

33KV Khulan Sarwar 

33KV Amar pura 

33KV Abohar 

27 132KV Mukatsar 66KV Fattan Wala 

66KV Rupana 

66KV Malout Road 

28 220KV Moga 132KV Dhale ke 

132KV Smadh Bhai 

132KV Panjgarain 

P&M Circle Ludhaiana 

29 220KV S/S Hambran 66KV FZR Road Ldh-I&II 

66KV Hambran 

30 220KV S/S Gonindgarh-II 66KV Badinpur, 66KV Central S/S, 

66KV Grain Markit 

31 220KV S/S Sahnewal 66KV Kanganwal-I&II, 66KV 

Sahnewal-I&II, 66KV Avery feeder, 

66KV Sport King 

67 

30 

8 

34 

20 

99 

109 

52 

130 

30

Punjab Islanding Scheme - Northern Regional Power Committee

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