(A State Govt. undertaking)

REPORTON

PUNJAB ISLANDING SCHEMERevised [R1]

(JANUARY, 2013)

Office ofChief Engineer/SLDC,

Punjab State Transmission Corporation LimitedE-mail: ce-soc@pstcl.org

INDEXCHAPTER 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 8-10Detail of Load to be met (Annexure- I A) i-iiDetail of Lines to be opened and Re-closed (Annexure-I B) iii-ivSketch of GGSSTP Ropar Island (Annexure-I C) v-xiv

5.2 GNDTP Bathinda & GHTP Lehra Mohabat Island 11-13Detail of Load to be met (Annexure-II A) i-iiDetail of Lines to be opened and Re-closed (Annexure-II B) iiiSketch of GNDTP Bathinda & GHTP Lehra Mohabat Island (Annexure-II C)

iv-x

6.0 Proposed Action Plan. 14-15

7.0 Major Challenges & Way Forward 16

8.0 Additional Annexures:

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)

17-18

19

20

21

APPENDIX

I Minutes of 1st Meeting of Islanding Scheme Group held on 7-Aug-2012

22-25

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

III Detail of Under Frequency Relays (UFRs) and df/dt Relaysinstalled at various Grid Sub Stations in Punjab 27-30

1

CHAPTER-1.0

1.0 PREAMBLE1.1 Two major grid failure incidents occurred on 30th and 31st 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 6th

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), which

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 sensingrelays so that in case of imminent grid failure, electrical islands can be formed.These electrical islands can not only help in maintaining supply to essentialservices 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. The group

agreed on various aspects & modalities for implementation of the islanding

2

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 21st 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.

3

CHAPTER 2.02.0 OVERVIEW OF PUNJAB POWER SYSTEM2.1 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 II2.3 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.

4

CHAPTER 3.0

3.0 GENERAL PHILOSOPHY ON FORMATION OF ISLANDS3.1 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 re-

adjustments 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.

5

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

6

switching action is required.

ii) The proposed island scheme shall required to be configured /re-

configured for peak and off peak operating conditions. The pre-

identified 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 Hzb) Stage II: When frequency further dips to level of 47.7 Hzc) Stage III: When frequency stays at 47.7 Hz*

* additional load shedding at an interval of 300milli-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)

7

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) One generating station in each island will be operated in frequency

control mode to control fluctuations in the frequency in that particular

island.

vii) 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) 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.

vii) 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.

8

CHAPTER-5.0

(A State Govt. undertaking)

ISLANDING - I

GGSSTP, RoparISLANDING SCHEME

9

5.1 GGSTP ROPAR ISLANDING SCHEMEThere 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 asunder:-

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

10

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 Ckt4. 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 Sahnewal18. 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 inWinter

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

Page-(i)

Details of Load to be met :- Annexure-IA

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)

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)

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

= 945 MW

220KV s/s Gobindgarh G-4 80 40 0 0 0

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)

1 200 66 KV Ckt Amloh Road-1 0

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

2 120 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 KV Ckt Amloh Road-1 0

66 KV Ckt Amloh Road-2 0

66/11 KV T/F T-2 12

66/11 KV T/F T-3 12

3 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

4 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

220 KV Sub Station

Gobindgarh G-1

220 KV Sub Station

Gobindgarh G-2

220 KV Sub Station

Gobindgarh G-3

220 KV Sub Station

Gobindgarh G-4

Page-(iii)

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

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)

Remarks

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

220KV GGSSTP: Goraya Ckt Ckt will be operative in winter

220KV GGSSTP: Jamsher Ckt Ckt will be operative in winter

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 66 KV Ckt Amloh Road-2

220KV Gobindgarh G-1 : Ikolaha 66 KV Ckt Chorwala

66 KV Ckt Amloh

66 KV Ckt Joti Bansal

66 KV Ckt Modern Steel

66 KV Ckt Dutt Multi

66 KV Ckt Aman

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

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 Amloh Road-2

66 KV Ckt Central

66/11 KV T/F T-2

66/11 KV T/F T-3

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

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 Annexure-IB

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 KV Ckt-1 G1

66 KV Ckt-2 G1

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

* These lines will be reclosed at 51.00 Hz

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

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 * These 66KV lines will be reclosed at 50.50 Hz

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)

RTP-Goraya Ckt will be opened from Goraya End in

Summer

RTP-Jamsher Ckt will be opened from Jamsher End

in Summer

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

47.7 Hz

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

at 47.9 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

Mohali

Kharar115 MW-PADDY110 MW NON PADDY

GG-480 MW PADDY40 MW NON PADDY

GG-380 MW

GG-2125 MW

GG-1200 MW

Goraya75 MW in nonpaddy season

JamsherOnly RailwayLoad

SahnewalNo Load

Kohara30 MW

ILK – 100 MVA, 220kV/132 kV ILK – 100 MVA, 220kV/132 kV

B.C.-2 B.C.-1220 kV Bus Bars

132 kV Bus Bars

Guj Ambuja Ropar Asron

GGSSTP, RoparIslanding Scheme755 MW

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

B.C.

v

Annexure-I C

RTP 4 RTP 3 Patiala 2 Patiala 1 Amloh RTP 2 RTP 1 GG 2-Ckt2 GG 2-Ckt1

T5, 100 MVA, 220kV/66 kV

220 kV Bus Bars

66 kV Bus Bars

Aman

B.C

T6, 100 MVA, 220kV/66 kV

T2, 100 MVA, 220kV/66 kV

Amloh Rd1 Amloh Rd2 Chorwala Amloh Joti Bansal Modern Steel DLT MultiRaghavNabha Talwara - 1 Talwara - 2 Bhawani Ind Focal Point Bassi Alloy

G-1 & G-4 (280 MW = 200+80 PADDY200+40 MW NON PADDY)UFR (48.2 Hz) installed here to be shifted to Mohali S/S

M1/M247.9 Hz

M1/M247.9 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

Ikolaha

M1/M247.9 Hz

220 kV S/S G-4(80 MW)

T-1110 A

T-4110 A

T-7110 A

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

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

vi

G2-G1 Link1 G2-G1, Link2

T5, 100 MVA, 220kV/66 kV

Ganguwal 1 Ganguwal 2

220 kV Bus Bars

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

T1, 100 MVA, 220kV/66 kV

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

G-2 (125 MW=230-105)

66 kV Bus Bars

M1/M247.9 Hz

M1/M247.9 Hz

S1/S247.7 Hz

D1 D1 D1

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

66/11 kV T2 66/11 T-3

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

vii

LILO G-2 LILO G-1

220 kV Bus Bar

T-5, 100 MVA, 220kV/66 kVT6, 100 MVA, 220kV/66 kV

G2 Ckt-1 G2 Ckt-2SanjivBhatia KC Soni G1 Ckt-1

G-3 (122- 42= 80 MW)

66 kV Bus Bar

G1 Ckt-2

S1/S247.7 Hz

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

ChorwalaUFR – 48.8 HzAlreadyinstalled42 MW

S1/S2Re-close

S1/S2Re-close

66 kV Lines will re-close (S1/S2 & S1/S2)at 51.0 HzReclosing load to be 4 to 5 MW per feeder

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

viii

220 kV Bus Bars

66 kV Bus Bars

B.C at 47.9 HzM1/M2

T1, 100 MVA, 220kV/66 kV

Sahnewal (Only Railway load)

RTPKoharaRailway Ckt. 2PGCIL,LaltonLalton 1 Doraha-1

AveryKohara Garg Vallabh

T4, 100 MVA, 220kV/66 kV

Railway Ckt. 2 Doraha-2

T3, 100 MVA, 220kV/66 kV

Sahnewal-1 Sahnewal-2 Kanganwal-1 Kanganwal-2LatalaUFR-48.8 Hz Sportking

M1/M247.9 Hz

220 kV Bus II

220 kV Bus I

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

D2 D2 D2

M1/M247.9 Hz

M1/M247.9 Hz

Bus-I will remain charged forredundancy of supply at Kohara

No Load – Except Railways

D2 – df/dt relay, already installed.

ix

RTP Sahnewal

220 kV Bus Bar

T-5, 100 MVA, 220kV/66 kVT1, 100 MVA, 220kV/66 kV

MahalauxmiAllied Industry Chaunta-BhainiSahib

Kohara (120- 90 = 30MW)

66 kV Bus Bar

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

S1/S2Re-close

M1/M247.9 Hz

M1/M247.9 Hz

S1/S2Re-close

66 kV Lines will re-close (S1/S2 & S1/S2)at 50.5 HzTime delay in ‘ms’ between lines (30 MW)

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

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

x

Gobindgarh-1 Malerkotla

220 kV Bus Bar

T3, 100 MVA, 220kV/66 kV

Tanda BadhaAmloh Road Gobindgarh

BhadsonUFR – 48.8 Hz17 MW

Amloh (137-17= 120 MW PADDY55 MW NON PADDY)

66 kV Bus Bars

Bimal AlloysNeelkanthModern 66/11 kV T-1 66/11 kV T-2

T4, 100 MVA, 220kV/66 kV

S1/S247.7 Hz

M1/M247.9 HzAt Malerkotla

Load Shedding schemes toBe installed for redundancy-Operation at 47.7 Hz withtime delay to sustain the island

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

xi

132 kV Bus Bar

16/20 MVA, 132kV/66 kV

Ropar

Morinda-1 Morinda-2

66 kV Bus Bar

Badali Mohali PTL Majri Dera Bassi Majra

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

220 kV Bus Bar

GGSSTP Mohali 1

Kharar (120 MW PADDY110 MW NON PADDY)

M1/M247.9 Hz M1/M2

47.9 Hz

xii

66kV Bus

220 kV Bus coupler220 kV Bus

Jalandhar-1 Jalandhar-2 Mahilpur

Sultanpur-1 & 2

Kotla Junga- 1 & 2Railway

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

100 MVA 220/66 KVPower Transformers (2)

Rehana Jattan

JamsherOnly Railway Load

GGSSTP Ropar Goraya

xiii

100 MVA, 220 kV/66 kV

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

66 kV Bus Bars

132 kV Bus Bar

25 MVA, 132 kV/33kV& 2 nos 20 MVA 132/11 KVPower Transformers

100 MVA, 220kV/132kVPOWER Transformers

Phillaur Nurmehal Nawan Shehar JamalpurRemains offfrom other end

Phagwara 1 & 2

Dosanjh Kalan Rurka Appra

33 KV Muthadda

GORAYA (75 MW NON PADDY LOAD)220 KV GGSSTP Ropar 220 KV Jamsher

M1/M247.9 Hz

xiv

11

(A State Govt. undertaking)

ISLANDING - II

GNDTP& GHTPISLANDING SCHEME

12

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-GHTPISLAND(S)

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

balance in the island is as per Annexure-IIA

Name of S/S Avg. Load Summer Avg. Load Winter220 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

13

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: MES220KV 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-2AT 220 KV BARNALA (PSTCL)66 KV Tapa66 KV Pakhoke66 KV Dhaula (UFR already installed)66 KV VarIndera66 KV Dhanaula 1 & 266 KV Abhishek66 KV Thuliwal (UFR already installed)66 KV Malwa66 KV Bus Coupler

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

Detail indicating locations of relays is given as per schematic diagramattached as Annexure-IIC

Stage II Island Operations:

If the frequency further falls below 47.7 Hz, it is proposed to furtherdisintegrate this large island into two islands with each generating stationcatering to its connected load.

Page-(i)

Details of Load to be met :- Annexure-IIA

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)

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

Load)

170 130 0 0 0

(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

Load)

170 130 0 0 0

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-

70=600))

220KV s/s Barnala(PSTCL) 55 40 0 0 0

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 Annexure-IIB

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)

Remarks

1 220 KV S/S GNDTP Bathinda 220KV GNDTP: 132 KV Baluana Ckt 220 KV GNDTP: 220 KV GHTP Ckt-1

220KV GNDTP: 220 KV Mukatsar-1 Ckt 220 KV GNDTP: 220 KV GHTP Ckt-2

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-

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**

** These lines will be reclosed at 51.00 Hz

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

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

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

132KV Baluana, NFL-1,2, Cantt & 132 KV IGC Ckts will remain

operative during winter season

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

sustain the island

220 kV Bus Bars132 kV Bus Bars

66 kV Bus Bars

66 kV Bus Bar

40/50 MVA, 132kV/66 kV25 MW

16/20 MVA, 132kV/66 kV10 MW

IGC

Cantt NFL-2 NFL-1 Balluana

Auto T/F

Auto T/FLeh-2 Leh-1 Muktsar Malout

100 MVA, 220kV/66 kV70 MW

B.C. B.C.

GNDTP (160 MW) Islanding Scheme

M1/M247.9 Hz

S1/S247.7 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

Maur

Installed at IGC S/S

66KV Kot Shamir 66 KV Mahavir 66 KV Dabwali RoadS1/S2 at 47.7 Hz32 MW

132 KV IGC132/11 KV (8 MW)

66 KV C-Compound (15 MW)At 47.7 Hz with TD of 0.5secSI/S2

66 KV MES (20 MW)At 47.7 Hz with TD of 1 secS1/S2

S1/S247.7 Hz

M1/M247.9 Hz

M1/M247.9 Hz

Coupling

All these relays will be disabled in non paddyseason

All these relays will be disabled in non paddy seasoniv

Annexure-II C

220 kV Bus Bars

66 kV Bus Bars

Bhucho

B.C

T1, 100 MVA, 220kV/66 kV85 MW

Phul

Lehra Mohabbat – Island of 480 MW(Local Load170 MW PADDY & 130 MW NON PADDY)

T2, 100 MVA, 220kV/66 Kv85 MW

B.C

B.C

Himmatpura167.5 MW

Mansa 1 Mansa 2 Himmatpura 267.5 MW

PSTCL, Barnala55 MW

BTI Thermal 1S1/S2 47.7 HzBajakhana 1

60 MW BBMB, BarnalaBajakhana 260 MW

BTI Thermal 2S1/S2 47.7 Hz

Rampura Nathana Bhai RupaLehraMohabbat

VikramCement Balianwala

M1/M247.9 Hz

M1/M247.9 Hz

At Mansa endTo be disabled innon- paddy season

v

Lehra 2

220 kV Bus Bars

66 kV Bus Bars

Dina Sahib

B.C

T3, 160 MVA, 220kV/66 kVT1, 100 MVA, 220kV/66 kV

Bhadaur BilaspurPatto HiraSingh Tallewal

Himmatpura (135 MW PADDY55 MW NON PADDY)

Lehra 1

66/11 kV T-2

S1/S247.7 Hz

S1/S247.7 Hz

S1/S2Re-close

66 kV Lines will re-close (S1/S2) at 51.0 Hz- Reclosing load to be 4 to 5 MW66 KV lines will trip after delay at 47.7 Hz

S1/S2Re-close

S1/S2Re-close

S1/S247.7 Hz

S1/S247.7 Hz

S1/S247.7 Hz

vi

220 kV Bus Bar

66 kV Bus Bar

T1, 100 MVA, 220kV/66 kV

Bajakhana (120 MW PADDY56 MW NON PADDY)

T2, 100 MVA, 220kV/66 kV

GHTP 1 Mukatsar Moga

Maluka Jaito Bhagta Jeeda Bargari12.5 MVA, 66 kV/11 kV

12.5 MVA, 66 kV/11 kV

GHTP 2

M1/M247.9 Hz

M1/M247.9 Hz

vii

220 kV Bus Bars

66 kV Bus Bars

Dhanaula-1

B.C

T1, 100 MVA, 220kV/66 kV

Varindra

PSTCL, Barnala (190 MW= 135+55NET 55 MW PADDY & 40 MW NP)

T2, 100 MVA, 220kV/66 kV

B.C at 47.9 HzM1/M2

Malerkotla 1 Malerkotla 2 BBMB, Barnala

Dhanaula-2ThuliwalUFR- 48.8 Hz Abhishek Malwa Barnala

T1, 100 MVA, 220kV/66 kV Pakhoke DhaulaUFR- 48.8 Hz

Tapa

M1/M247.9 Hz

M1/M247.9 Hz

66/11 kV T-566/11 kV T-4

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

At Malerkotla end

S1/S247.7 Hz

S1/S247.7 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

S1/S247.7 Hz

M1/M2 47.9 HzAlong withPSTCL bussectionalizing220 KV breaker

viii

220 kV Bus Bars

66 kV Bus Bars

Dhalewan

B.C

T1, 100 MVA, 220kV/66 kV

Joga Bhikhi

Mansa (125 MWNon Paddy load Only)

Lehra 2Lehra 1Refinery Ckt. 2Refinery Ckt. 1Jhunir Sunam

BudhladaCkt-1

Maur

BudhladaCkt-2

T2, 100 MVA, 220kV/66 kV

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

T5, 100 MVA, 220kV/66 kV

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

M1/M247.9 Hz

Relays to be disabledIn non paddy season

ix

220 kV Bus Bar

100 MVA, 220 kV/66 kV

B.C

66 KV Mansa

66 kV Bus Bars

M1/M247.9 Hz

SunamMansa

Sardulgarh Aalike

JHUNIR75 MW

NON PADDY LOAD

20 MVAPower T/F

x

14

CHAPTER-6

6.0 PROPOSED ACTION PLAN FOR SUCCESSFULIMPLEMENTATION AND SURVIVAL OF ISLANLANDINGSCHEME

The islanding scheme is designed for a typical load-generation balance undersummer and winter load scenario. However, considering system dynamicsand actual load conditions, it creates un-certainties in the survival of theislands. Initially the islanding scheme as discussed in Chapter-5 can beimplemented with the deployment of frequency sensing relays but additionalmeasures would be required over a period of time to enhance success rate ofislanding scheme.The following steps are proposed to be taken to enhance probability ofsuccess & survival of islanding scheme:-

6.1 Deployment of Numerical Relays.

State of the art Numerical relays (Under frequency cum df/dt) shall beprovided at the identified locations, which shall have faster response time.The existing static UFR & df/dt relays at the Island locations shall also bereplaced with digital numerical relays. The relay shall be capable to integratewith existing/upcoming optical fiber communication network , under ULDCscheme. Detailed Technical specifications and Bill of Material is given asAnnexure III & IV respectively.

6.2 Intelligent System for Load Shedding & Remote Monitoring.

An intelligent system through existing or stand alone SCADA system will beimplemented to continuously monitor the generation (including governorresponse of the generating units) and load at sub stations forming part ofrespective island (s), on real time basis and decision in the formation of islandas well as during the restoration process. The intelligent system shall havecentral control and command centre at SLDC The system will necessarilyrequire optical fiber based communication network. Such intelligent systemwould enhance the reliability of formation of islands. Detail status ofconnectivity & RTUs installed at Substations is given as per Annexure-V.Till such time the above intelligent system is developed, the proposed schemebased on Numerical Relays shall be in place.

15

6.3 Network & Simulation Studies.

To assess stability and re-validate the formation of proposed islands underdifferent scenario, Dynamic network simulation studies and stability analysiswould be required beforehand. The study would analyze degree of swings inthe bus voltages, line flows and relative rotor angles, etc. The studies wouldalso suggest any additional measures to be taken for enhancing success rateof islanding. Line network diagram of system showing boundary of islands isgiven as Annexure VI.

6.4 Regular preventive Maintenance.

In order to ensure reliability of the island, regular preventive maintenance ofcontrol switchgears, relays & protection system and governors at each of thegenerating units, as covered in the scheme, shall be carried out by therespective agencies.

6.5 Additional Requirements:

Any additional provision to meet with the functional requirements of theScheme 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, bythe SLDC in consultation with the utilities. Changes in system topology,loading conditions, generation/demand growth, etc shall be reviewed andnecessary 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 beimparted to the System Operators at SLDC and other personnel involved atthe sub stations and generating stations. A detailed mock drills shall beconducted regularly, at least once in a year. SLDC shall co-ordinate thisactivity with the utilities.

16

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), BBMB and POWERGRID etc. Punjab

SLDC will follow instructions issued by NRLDC.

17

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

18

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

19

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 21Total S1 18Total S2 18Net Total 7820% extra 16TOTAL 94

20

Annexure-VI

Status of Connectivity & RTU availability at locations under Islanding Scheme

S.No. Name of Sub-Station SCADA/RTU

AvailabilityOptical FiberConnectivity Remarks

1. 220 KV S/S GGSSTPYes

(C-DAC) Yes RTU underupgradation

2. 220 KV S/S G-1 & G-4 Yes(C-DAC) Yes

3. 220 KV S/S G-2 Yes(Areva)

Approved

4. 220 KV S/S G-3 No Approved DFE make RTUalready ordered

5. 220 KV S/S Amloh No Yes DFE make RTUalready ordered

6. 220 KV S/S Kharar No Approved DFE make RTUalready ordered

7. 220 KV S/S Kohara No No DFE make RTUalready ordered

8. 220 KV S/S Sahnewal Yes(Areva)

No

9. 220 KV S/S Jamsher Yes(C-DAC)

Yes RTU underupgradation

10. 220 KV S/S Goraya Yes No

11. 220 KV S/S GNDTP Yes(C-DAC)

Yes RTU underupgradation

12. 220 KV S/S GHTP Yes(ABB)

Yes RTU underupgradation

13. 132 KV IGC No No

14. 132 KV Maur No No

15. 220 KV Himmatpura No No UnderCommissioning

16. 220 KV Bajakhana No No UnderCommissioning

17. 220 KV Barnala Yes(DFE)

Yes

18. 220 KV Mansa Yes(Areva)

No

19. 220 KV Jhunir No No UnderCommissioning

3*66MW(NHPC)

BAIRASIUL(HP)(PSEB)SHAHPURKANDI

JASSORE(HP)

6*60MW(BBMB)

(HP)PONG

(PSEB)RSD

HIRANAGAR(J&K)

SARNA

TIBBER

DASUA

MAJITHA

F.G.Ch.

KARTARPUR (PSEB)

WADALAGR. KHASA

BALA CHAK

VERPALTOHAMIRPUR

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

PATHANKOT

SARNA

BASSI

CHOHALMAMUN

ASHP(GANGUWAL)

MAJARA

NAKKIAN

JADLA

GURDASPUR

DHARIWAL

BATALAHOSHIARPUR

MHP-1

MHP-2

MHP-3MHP-4

(PSEB)

(PSEB)

(HPSEB)

(PSEB)

(PSEB)TO KARTARPUR

DEHAR

BHAKRA(R.B.) BHAKRA(L.B.)

GANGUWAL

DEHARPANIPATBHIWANI

CHAMERA(HP)

GANGUWAL

AMBUJAR.T.P.

TO JAGADHRY(HR.)TO DHULKOT(HR.)

(BBMB)

(BBMB)

(BBMB)

(BBMB)

(BBMB)

(BBMB)

(BBMB)

HAKIMAGATE

WADALAGRANTHIAN

KATHUNANGAL

VERKA

TANDA

BHOGPURSHRIHAR-GOBINDPUR

JAINTIPUR

P.COLONYC.L.ASR MALL

MANDI(LOHARKA)

(PAKHAR WALA)

GT.ROAD ASR.NARAINGARH

VERPALSAKATRIBAG(PGCIL) KARTARPUR(JAL)

TARN TAARAN

KISHAN PUR

ALAWALPUR

JANDIALA

TANGRA

EKALGADDA

BHIKHIWIND

PATTI

SULTANPUR

RASHIANA (TARANTARAN)

PATTIKOTLAJUNGA

(PGCIL)

(PGCIL)

RCFSCIENCE

KHERAMANDIR

KAPURTHALA

CITYCHILDRENPARK

BUTARI

DERABEAS

KARTAR PUR

DHILWAN

JALANDHER-1

RAILWAY

BUTARI

ALGAON

SULTANPUR

(RAILWAY)CHAHERU

JAMSHER(JAL.-2)

1*250 MVA

PATIALAFAGAN MAJRA

2*315MVA

4X150MVA

(PGCIL)BALA CHAK2*315MW

JALANDHAR-1(BBMB)

KOTLA

ROPAR

ASRONMAX

INDIADCM

BILASPURCHAMKAURSAHIB SIHORA

SAMSPURA

RAILWAYKURALI

GOBINDGARH-1

GOBINDGARH-2

AMLOH ROADGOBINDGARH

DORAHA

GHULALMES

N.F.L.

IGC ABOHAR BALUANAGIDARWAHA

BADALMAUR

MUKTSAR(OLD)

MUKTSAR

SARAINAGA MUKTSAR(NEW)

KOTKAPURA-1KOTKAPURA-2

JALALAWAD

GUBHAYA

MALOUT

MALOUT

TO MANSA

DHARAMKOT PANJGARIAN

BADHNIKALAN

MOGA-2

GHOLIANKALAN

BAGHAPURANA

FARIDKOT

SADIK

BAJAKHANABARNALA

AJITWAL

JAGRAON

SADIK

BOTIANWALAMASTEWALA

FEROZPUR

MOGA(PGCIL)

(BBMB)

MOGA

SMADH BHAI

BAGHAPURANA

MOGA

3*100MVA

2*90MVA

KHARAR

6*210MV(PSEB)R.T.P.

TONALAGARH(H.P.)

RAJPURAPATRAN

RAILWAY

DERABASSI

LALRUMOHALI-II

MOHALI

MAJRA

BAHADURGARH

FAGAN

RAJLA

ABLOWAL (PATIALA)

KOHARAAMLOH

SAHNEWAL

RAILWAY

BATHINDA2*110MW

2*210 MWG.H.T.P.(PSEB)

HIMATPURA

MANSA

JHUNIR

SUNAM

DHURI

BARNALA(PSEB)

MALERKOTLA

MALERKOTLA

(PSEB)

(PGCIL)

(PGCIL)

TO FAGANMAJRA

(NTPC)

2*315MVAMALER KOTLA

TO DADRI

SANGRUR

(PGCIL)

PAKHOWAL

FZR.RD.LDH

FEROZESHAH

TALWANDIBHAI(KOT KROR)

FEROZPUR

LALTON KALAN

LUDHIANA (PGCIL)

HAMBRANJAMALPUR

DHANDARIKALAN

2*315MVA(PGCIL)LUDHIANA

(BBMB)

(BBMB)

(PGCIL)

23

100MVA

MAHILPUR

NAWANSHAHAR

MAHILPUR

BANGA

PHAGWARA

GORAYA

NURMAHALNAKODER

URBANESTATE JAMALPUR

SWADIKALAN

SOSAN

MOGA-1(OLD)

MOGA(NEW)

2*110MW(UNIT#1&2)BATHINDA(PSEB)

TO MAUR

(PSEB)

H

H

H

H

H H

HH

H

H

H

H

H

H

H

H

H

HH

H

H

H

T T

T

T

100MVA

100MVA

100MVA

1*100MVA

2*100MVA

3*100MVA

2*100MVA

2*315MVA

100MVA

2*90MVA

100MVA

2*100MVA

2*100MVA

3*100MVA

2*100MVA

100MVA

100MVA

(0.4 SQ.")

(BBMB)

LINE NETWORK DIAGRAM FOR POWER SYSTEM OF PUNJAB

220KV LINE765KV LINE132KV LINE

400KV LINE

RAILWAY

IKOLAHA

ISLAND-1GGSSTP

ISLAND-2GNDTP &GHTP

Annexure-VI

22

23

24

25

27

Appendix-IIIA( Sh 1 of 4)

Detail of Under Frequency Relays (UFR) installed at Grid Sub-Stations.Sr.No.

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

P&M Circle Amritsar1 2202KV Khassa 66KV Attari 252 220KV Patti 66KV Chohla Sahib

66KV Sarhali25

3 220KV Fatehgarh Churian 66KV Ajnala66KV Ram Dass66KV Jhander66KV Wadala Veeram

35

4 220KV Wadala Granthian 66KV Udanwal 215 220KV Tibber 66KV Purana Shalla 76 220KV Kotli Surat Mali 66KV Shahpur Goraya 6

P&M Circle Jalandhar7 132KV Banga 66KV Rehana Jattan, 66KV Behram 65MVA8 132KV Jadla 66KV Balachour & Kerawar line 70MVA9 132KV Nawanshahar 66KV Aur & Rahon 50MVA10 220KV Kartarpur 66KV Nadala Hamira & Mustfapur 45MVA11 220KV

Kotla Janga66KV Malsian Alewali, Shahkot,Malian & Cap, Bank

153.5MVA

12 132KV Bhogpur 33KV Kandhala Jattan & 33KV Bholath 34 MVA13 132KV Nakodar 66KV Shanker.

( UFR relay is installed on 66KVShanker feeder was shifted on 220KVKotla Janga on 26/6/12)

32.5 MVA `

P&M Circle Patiala14 220KV S/S Ablowal 66KV Lung 10.2915 220KV S/S Bahadurgarh 66KV Ghanour 22.86

16 132KV Ropar 66KV Bahlolpur 7.42017 220KV S/S Patran 66KV Moonak 68.587

18220KV S/S Sunam

66KV Chajli 43.4466KV Cheema 42.75

19 220KV S/S Dhuri 66KV Kanjla 1820 220KV S/S Barnala 66KV Dhaula, Thuliwal 37.521 220KV Malerkotla -

P&M Circle Bathinda22 220KV S/S Mansa 66KV Budhhlada ckt-I

66KV Budhhlada ckt-II,66KV Bhikhi line,66KV Dhelwala line

32 MVA32MVA

28.57MVA28.57MVA

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

45 MVA

24 220KV S/S Ghubaya 66KV Ladhuka 92.5MVA25 220KV S/S Sadiq 66KV I/C I&II 63.8MVA

28

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

27 132KV S/S Abohar 33KV Khuhi Khera line Br, out of ckt28 132Kv Kotkarore 66KV Mudki line 37.5MVAP&M Circle Ludhiana29 132KV Doraha 132KV Bilaspur-Sihora line, 66KV

Payal Chawa line, Setco line68MVA

30 220KV Sahnewal 66KV Latala 20.5MVA31 132KV Sawadi 132/11 T/F T-1 20 MVA32 220KV Jagraon 66KV Sidhwan Bet & Rasulpur &

Raikot55MVa

33 220KV Gobindgarh-I 3No, 220/66KV T-1, T-2&T-3 226MVA34 132KV Amloh 66KV Bhadson line 55MVA35 220KV Dhandari-I 2x100MVA 220/66KV side 184MVA36 220KV Goraya 33KV Apra & Dosanj Kalan 55MVA37 220KV S/S Gobingarh-III 66KV Chaurwala 50MVA

29

Appendix-IIIB( Sh 3 of 4)

Detail of df /dt Relays installed at Grid Sub-Stations.P&M Circle AmritsarSr.No.

Name of S/Station Name of Feeder Load Relief inMW

1. 132 KV Bhikhiwind - 482. 132 KV Tarn Taran 1) 66 Kv Chola Sahib

2) 66 KV Manochahal62

3. 132 KVTangra - 114. 132 KV Jandiala Guru - 135. 132 KV Ekal Gadda - 66. 132 KV Dhariwal 66 KV Naushera Majja Singh 127. 132 KV Naraingarh 1. 66 KV OCM Ckt.I

2. 66 KV OCM Ckt.II3. 66 KV Gowal Mandi4. 66 KV Sarai Amanat Khan5. 66 KV Hall Gate

54

8. 220 KV Civil Lines, Asr 66 KV Harsha Chhina 39P&M Circle Jalandhar9 220 KV S/Stn. Jamsher 66KV Daulatpur 50

10 132 KV S/Stn. Nurmehal - 32

11 132 KV S/Stn. Hoshiarpur 66KV Sadhu Ashram,66KV Sham-84, 66KV Attowal,

66KV Nasrala, 66KV Focal Point

33

12 132 KV Bhogpur - 28

13 132 KV Tanda - 13

14 132 KV Alawalpur - 8

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

66KV Talwandi Madho,66KV Talwandi Chaudhrian

47

16 132 KV Kheramandir - 32

17 132 KV Kapurthala - 17

18 132 KV Dhilwan - 8

P&M Circle Patiala19 220KV S/S Rajpura 66KV Gajjukheran Sirhind, Rajpura old,

Dharamgarh90

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

91

21 132KV Chamkaur Sahib 11KV feeders 1622 132KV Anandpur Sahib 11KV feeders 20

P&M Circle Bathinda

30

23 132KV Sadiq 66KV Golewala66KV Sukhanwala66KV Guru Har sahal66KV Jhoke Tehal Singh66KV Deep Singh wala

67

24 132KV Maur 66KV Talwandi Sabo66KV Jodh pur66Kv Joga Ralla

30

25 132KV Sarainaga 20/10/10MVA, 132/33/11KV P/T/FControlling33KV Wara Kishanpura11KV Khokhar11KV Waring11KV Hari ke Kalan11KV Baja Marar

8

26 132KV Abohar 33KV Kaller Khera33KV Khulan Sarwar33KV Amar pura33KV Abohar

34

27 132KV Mukatsar 66KV Fattan Wala66KV Rupana66KV Malout Road

20

28 220KV Moga 132KV Dhale ke132KV Smadh Bhai132KV Panjgarain

99

P&M Circle Ludhaiana29 220KV S/S Hambran 66KV FZR Road Ldh-I&II

66KV Hambran109

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

52

31 220KV S/S Sahnewal 66KV Kanganwal-I&II, 66KVSahnewal-I&II, 66KV Avery feeder,66KV Sport King

130