SUBSTATION LAYOUT, SWITCHING SCHEMES AND GENERAL ARRANGEMENT

16.02.2009 (15:45 TO 17:15) MANOJ KUMAR, MANAGER (S/S), MOGA

kmanoj78@hotmail.com
manoj.kumar@powergridindia.com Mob. : 09417215560

General Arrangement
A Designer perspective, but fine tuned at site

Placement of switchyard Control Room placement Fire fighting pump house placement DG set placement LT station placement (ACDB, DCDB, Battery Bank & Battery Charges Identification of roads & rail tracks Identification of boundary wall and fencing Identification of approach roads Space for colony and other infrastructures

Switchyard Layout
Single Line Diagram Bus Switching Scheme Normal rating with temperature rise, Short time current rating Rating & insulation levels of the equipments Bay numbering

General Arrangement
LAYOUT (PLAN & SECTION) OF SWITCHYARD

PLANNING ASPECTS: Switching scheme to be adopted. Type of Layout (D or I) Details of feeders requirements. Future/anticipated expansion of the substation . Available size of plot .

Major factors deciding a layout

Standard factors
Electrical clearances Heights of different levels & electric field Shape of land & feeder orientation Bus bar arrangement Type of isolator used Arrangement of lightning protection Location of control room building, FFPH Roads and rail tracks

Variable factors

General Arrangement
Following factors determine the switchyard area

Conventional (AIS) OR GIS

D Type OR I Type Layout Automation (SAS) OR without Automation

GA:- Area occupied by one Dia in D & I Layout

8662.5 sqm=2.14 acre (27m bay width) 7969.5sqm=1.969 acre (24m bay width) 3504 sqm = 0.865 acre (24m bay width)

Layout (Plan & Sections)

Selection of conductor for main bus, Transfer bus, Jack bus, equipment interconnection
AAC conductor ACSR conductor AAAC conductor Aluminium pipe

Space for a bay (bay width)

Phase to phase clearance Phase to earth clearance Section Clearance .under worst condition

Minimum Clearances for Layout (at altitude <1000m above mean sea level)
Voltage Level (Rated)
765 kV 400 kV 220 kV 132 kV

Ph-Ph (mm)
7600 4000 2100 1300

Ph-E (mm)
4900 3500 2100 1300

Sectional Clearance (mm)

10300 6500 5000 4000

110 kV
66 kV 33 kV

1100
630 320

1100
630 320

3800
3500 2800

Altitude corrections w.r.t clearances, insulation levels, creepage and oil temperature rise of the equipment shall be considered for altitudes more than 1000 m above mean sea level.

Design Calculation for Layout

Sag tension calculation & Sag tension Chart w.r.t initial static tension, maximum temperature rise etc. Short circuit force calculation and determination of spacer span as per IEC:865

Direct Stroke Lightning Protection (DSLP) Calculation By Lightning Masts By Overhead earthwires
Design of earthing system Touch & step potential control Grid resistance as low as possible Location of fencing

Bay widths & levels

Voltage Level Bay width First Second Level Level Third level BIL kVp SIL kVp

765 kV

38m

14m 8m

27m 15m 11.7m 7.5m 6m

39m 22m

2100 1550 1550 1050 650 NA NA

400 kV 27/24m

220 kV 18/16m 5.9m 132 kV 12m 4.6m 66 kV 7.6m 4m

16.2m 1050 10.8m 650 9.5m 325

Ligtning Impulse : 1.2/50 micro sec Switching Impulse: 250/2500 micro sec

To understand Single Line diagram & Layout plan drawing

To understand Layout Section drawing

STANDARD CLASSIFICATION OF TOWERS

Wind Zone : 47m/Sec Height 400kV Height Tower First Second Type Level Level TA TB TC TD TE TF 15 m 15 m 15 m 15 m 15 m 15 m NIL NIL NIL NIL NIL NIL

Peak
7.5m 7.5m NIL NIL 7.5m 7.5m

Angle of End /Middle Deviation

30 deg 30 deg 0 deg 0 deg 0 deg 0 deg End Middle End Middle End Middle

TG
TH TI TJ TK TL TM TN

22 m
22 m 22 m 22 m 15 m 15 m 15 m 15 m

NIL
NIL NIL NIL 7m 7m 7m 7m

7.5 m
7.5 m 7.5 m 7.5 m 7.5 m 7.5 m 7.5 m 7.5 m

30 deg
30 deg 0 deg 0 deg 0 deg 0 deg 30 deg 30 deg

End
Middle End Middle Corner/ 2beams Middle/ 3beams Corner/ 2beams Middle/ 3beams

NON-STANDARD TOWERS (MOGA)

Tower Type
Description

400kV
TG TSP G5 GSP Beam at 15 m with peak 23m Beam at 23m with peak 30 m Beam at 15m (Twin Moose) Beam at 23m Beam at 11m Beam at 11m & 17.5m Beam at 11m & 17.5m with peak 22m Beam at 11m (Single Moose) Beam at 11m (Twin Moose) Beam at 17.5m (Single Moose)

220kV
TA TB TC G1 G2 G3

Typical dimensions between equipments

400 kV 220 kV 132 kV 66 kV

CB&ISO ISO&CT CB&CT Gantry Tower &ISO SA &PI& CVT

LA & SR Road & SR

10.5 m 7m 7m 6m
6m 7m 15 m

6.5 m 4m 3m+road+5 m 3.5 m

3.5 m -

3.75m 2.5 m 2.5 m 1.8 m

2.5 m -

3m 2m 2m 1.8 m
2m -

Control Room Building

Placement of Control, Relay & Protection Panels PLCC Panels AC Distribution Board DC Distribution Board Batteries (220V, 48V) Battery Chargers Lighting Transformers Lighting Distribution Boards Rooms of Station-in Charge & staff Miscellaneous

Fire Fighting Pump House

Placement of
AC driven main pump DG driven stand-by pump Jockey Pump Air Vessels AC Distribution Board cum pump control panels Fire Water Tank

Miscellaneous
Placement of
LT Station (ACDB, DCDB, Battery Bank & Battery Chargers) Diesel Generator Set with AMF Panel Security hut Office Buildings Other residential buildings

Gas Insulated Substation (GIS)

GIS in POWERGRID
POWERGRID is constructing 132kV, 220 kV & 400 kV GIS substation Construction of 800 kV GIS is under consideration

Technical Advantage of GIS

All equipments are compact in size and enclosed in SF6 gas with metallic enclosure Area requirement of GIS is approx. 20% of conventional AIS Lesser structures & foundation works; Hence less execution time Costlier than AIS

Bus Bar Switching Schemes

Factors dictating choice of bus switching scheme

1)

Reliability No Power interruption during Bus fault

CB Maintenance No Power interruption during CB maintenance. Taking out CB for maintenance shall be easy

2)

3)

Bus Bar Maintenance No Power interruption during Bus bar maintenance

Bus Bar Switching Schemes

4) Simplicity of protection arrangements Protection arrangements shall be simple for easy commissioning and regular checking Ease of Extension Extension of Bus bar necessary to take care of future expansion. Power interruption during such extension works.

5)

6)

Cost Optimal techno-economic solution

Bus Switching Schemes

Single Main Bus Scheme with sectionaliser & without sectionaliser Single Main & Transfer Bus Scheme Double Main Bus Scheme Double Main with by-pass isolator Bus scheme Double Main & Transfer Bus Scheme One & Half Breaker Bus Scheme Double bus two breaker Scheme Ring Bus Scheme

SINGLE BUS SCHEME

Simplest and cheapest bus bar scheme Maintenance and extensions of bus bars are not possible without shutdown of the substation. Operation & maintenance of bus bar is easy.

SINGLE BUS WITH SECTIONALISER

Similar to the single bus scheme except the sectionalising breaker or isolator. By keeping the sectionaliser open one section can be in service and the other can be taken for maintenance or extension. If a bus section breaker is provided busbar protection can detect fault on any section and trip the breakers connected to that section and isolate it.

SINGLE MAIN AND TRANSFER SCHEME

Individual CB can be taken out for maintenance on-load at a time. The transfer bus coupler acts as the breaker for the circuit under by pass.

Individual circuits have a bypass isolator to connect to the transfer bus and this isolator will be closed during bypass operation of that particular circuit.

DOUBLE BUS SCHEME

Load will be distributed on both the buses and the bus coupler shall be normally closed. For maintenance & extension of any one of the buses the entire load will be transferred to the other bus. On load transfer of a circuit from one bus to the other bus is possible through bus isolators provided the bus coupler is closed and thereby two buses are at the same potential.

On load bypassing of any circuit for breaker maintenance is not possible.

DOUBLE BUS WITH BY-PASS SCHEME

DOUBLE BUS WITH BY-PASS SCHEME

This bus arrangement provides the facilities of a double bus arrangement & a main and transfer bus arrangement. The bus to which the transfer bus isolator is connected can be used as a transfer bus also. During the time a circuit is under bypass, the bus coupler will act as the breaker for the bypassed circuit.

DOUBLE MAIN AND TRANSFER SCHEME

In this bus scheme, in addition to the two main buses there will be a separate transfer bus also. Since separate transfer bus is available there will be no need of transferring the load from one bus to the other bus unlike in a double main cum transfer bus arrangement. Other features are similar to the one described in double bus with by pass arrangement.

BREAKER AND HALF SCHEME

In this scheme, two circuit have three breakers, the middle breaker ties the two circuits and hence is called the tie breaker. Breaker or bus maintenance is possible without any shut down of the feeder Even if both the buses are out of service, power can be transferred from one feeder to another feeder through tie breaker

DOUBLE BUS TWO BREAKER SCHEME

Each feeder is controlled by two breakers. This arrangement is comparatively costlier than other scheme and hence followed in very important circuit only. In this arrangement breaker maintenance for any feeder circuit is easily possible without any shutdown.

RING BUS SCHEME

As long as the ring is closed load has two sources of supply and any circuit breaker can be taken out of service without affecting the supply.

Extension of ring scheme is difficult.

No bus bar protection required.

Bus Switching Selection considerations

Reliability Operation Flexibility Ease of Maintenance Short Circuit Level Limitation Simplicity of Protection Arrangement Ease of Future expansion Land availability Cost

A Case Study

Of
MOGA SUBSTATION

TRANSMISSION NETWORK OF MOGA SUBSTATION

400 KV D/C MHTL & MFTL 120.465 km (Loc 1- 321) 220 KV D/C PSEB MOGA-I&II (400mtr)

800 KV KMTL-1 51.343 km (Loc 581-710) 800 KV KMTL-2 49.212 km (Loc 602-730)

800 / 400 / 220 KV MOGA SUBSTATION 1065 MVA (4 ICTs & 3 Reactors)
+ under const : 2 Nos. 63 MVAR Bhiwadi Line React(NRSSS-V) + Proposed : 765/400kV System and LILO of PSEB Nakodar Line

220 KV D/C PSEB MOGA-III &IV (400 mtr)

400 KV D/C JMTL 52.232 km (Loc 510-647)

220 KV D/C PSEB Jagraon-I&II (35km)

765 KV S/C Bhiwani - MOGA

400 KV D/C MOGA Bhiwadi 352 km (under const.) NRSSS-V

Layout of Moga Substation

A Case Study D Type Layout (Residential area is more than switchyard area) DE Tower of 400kV D/C Hisar Line located in 220 kV Switchyard obstructing future expansion of 220 kV S/Y Location of Dead End Tower from Take off Gantry: Dead End Tower of 220kV Jagraon Line of PSEB was shifted from 30m to 100m outside boundary wall

Gantry is designed for 200m span with angle deviation 30 deg both in vertical & horizontal plane

LAYOUT OF COLONY & SUBSTATION COMPLEX

Layout of Moga Substation: A Case Study

Bhiwadi Bays Extn works at Moga: Problems identified and changes proposed as per site conditions Take-off gantry of Bhiwadi Line shifted by 9m to reduce angle on gantry from 15 deg to 9 deg Matching of towers TG (Standard vs Non-standard) Dead End Tower of 400kV Moga-Bhiwadi Line was shifted as per site condition facilitating 765kV interconnection Foundation for CT in Tie Bay falling over already constructed cable trench No scope kept for Stone spreading, construction of approach roads for bays, incl old KMTL bays Re-orientation of rail track in reactor foundation LM marked in the engg. drawing but not existing

Layout of Moga Substation

A Case Study Re-locating 50 MVAR Bus Reactor Bay numbering in random order including Tie Bay T1 & T2 Isolators 400kV D/C Moga -Jalandhar Line in one Dia Provision of SVC 33kV, 25 MVAR Tertiary Reactors Shifting of Bus CVTs Conversion of 5 CT to 3 CT protection scheme Re-locating 245kV CT to enhance availability

A. TOTAL AREA
1. 400 KV SWITCHYARD

: 70.25 Acers
: 31.60 Acres : 13.77 Acres : 24.88 Acres

2. TOWNSHIP BUILT-UP AREA 3. TOWNSHIP OPEN AREA

B. ADDITIONAL LAND ACQUIRED : 33 Acers FOR 800 KV SWITCHYARD C. ADDITIONAL LAND BEING : 32.3 Acres ACQUIRED FOR 765KV SUBSTATION
(2X1500 MVA, 765/400KV ICT, 2x240MVAR BUS REACTOR, 1X240 MVAR LINE REACTOR & TSS OF TALWANDI SABO OF PSEB)

SINGLE LINE DIAGRAM OF 400 / 220 KV MOGA SUBSTATION (WITH FUTURE PLAN)
400 KV KISHENPUR-I 50 MVAR BUS REACTOR
41489R E 41489R 1000500/1A 41389T 2 41389T2 E 41352
63 MVAR LINE REACTOR

400 KV JALANDHAR-I

400 KV JALANDHAR-I I

400 KV KISHENPUR-I I
63 MVAR LINE 63 MVAR LINE REACTO R 41789R E 41789R 41652

Bhiwadi-I Bhiwadi-II
63 MVAR LINE 41789L E 41789L 41689T 2 1000500/1A 41789B 41689T2 E 41789B E 41752 41789A E 41789A 41989L E 41989L 42089T 1 41989B 41989B E 42052 42089T1E 42089T2E REACTO R 42089R E 42089R

Spare

41289L E 41289L 41389T 1 41389T1E 41289B E 1000500/1A 41289A E

4189LE 4189L 1000500/1A 4389T1 4189BE E 4389T1 4352 1000500/1A

4289LE 4289L 4389T2 4389T2 E 4289BE 4289B 1000500/1A 4252

41289R E 41289R 41289B 4189B 1000500/1A 4152 41252 4189A 41289A

REACTO R 41589R E 41589R 41589B

41589L E 41589L 41689T 1 41689T1 41589B E E 1000500/1A 41552 41589A E

42089T 2

41489B 41489B E 1000500/1A 41452 41489A E 41489A

4189AE 1 4189AE 2

4289AE 1 4289A

400 KV BUS-I

4289AE 2

41589A

41952 41989A E 41989A

42189A E 42189A

400 KV BUS-I I
4989A 4989AE 41089A E 41089A 41889A 41889A E 4589A 4589AE 4552 41889B E 4889T2 E 4889T2 41089C 41889C 1000500/1A 41889C E 4852 1000500/1A 1000500/1A 4589BE 4889T1 E 4589B 4889T1 4589L 4589LE 4452 1000500/1A 4489BE 4789T2 E 4489B 4789T2 4752 1000500/1A 4489A 4489AE 4689AE 4652 1000500/1A 4689BE 4789T1 E 4789T1 4689C 4689CE 4689A

4952 1000500/1A 4989BE 41189T1 E 100041189T 500/1A 1 41152 4989CE

1 MVA 33/0.433 kV

41052 1000500/1A 41089B E 41189T2E 1000500/1A 41089C E

41852 1000500/1A

CONTROL

ROOM

4989B

41089B

41889B

4689B

4989C

250 MVA ICT-I

250 MVA ICT-I I

250 MVA ICT-I I I

315 MVA ICT-IV

25 MVAR Ter. Reactor-I

25 MVAR Ter. Reactor-I I

400 KV

400 KV

220 KV BUS-I 220 KV BUS-I I

2189A 2189B 2189E1 2152 1000500/1A 2189E2 2189C 2289E1 2289A 2252 1000500/1A BUS COUPLER 2789E1 2752 2789E2 2789L 2789E3 2789C 2389E3 2289B 2789A 2789B 2389A 2389B 2389E1 2352 2889E2 2389T 1000500/1A 2389C 1000500/1A 2889E1 2852 2889A 2889B 2489E1 2452 2489A 2489B 2589E1 2552 2589A 2589B 2689A 2689B 2989E1 2652 2952 2989E2 2989T 2989E3 2989C 1000500/1A 2689E1 2989A 2989B

FATEHABAD HISAR

2389E2

2589E2 2689E2 2489E2 2689T 2889L 2489L 2589L 2489E3 2489C 1000500/1A 2589E3 2589C 1000500/1A 2689E3 2689C 1000500/1A

2889E3 2889C 1000500/1A

21089A 21289A 21189A 21089E 21089B 21289B 21189B 21289E 1 21189E 1 1 21052 21152 21252 21089E 21189E 21289E 2 2 2 21289T 21089T 21189T 21089E 21189E 21289E 3 3 3 100021089C 21189C 21289C 500/1A 1000500/1A 1000500/1A

220 KV TRANSFER BUS

220 kV TBC BAY

220 kV PSEB-I I I

ICT-I BAY 220 kV PSEB-IV

220 kV PSEB-I

220 kV PSEB-I I

ICT-I I BAY

ICT-I I I BAY

Switchyard Fencing

220 kV 220 kV Jagraon-I Jagraon-II

ICT-I V BAY

Small Scale industry House Small Scale industry

TO BE DISMENTELED

Small Scale industry House Small Scale industry

TO BE DISMENTELED

Small Scale industry House Small Scale industry

TO BE DISMENTELED

MOGA SUBSTATION AUGMENTATION OF EXISTING TRANSFORMATION CAPACITY - INSTALLATION OF ICT-IV AND ASSOCIATED BAYS
SPARE 400 KV KISHENPUR-I 400 KV JALANDHAR-I 400 KV JALANDHAR-II 400 KV KISHENPUR-II 400 KV BHIWADI-I 400 KV BHIWADI-II 250 MVA ICT-IV
63 MVAR LINE REACTOR 63 MVAR LINE REACTOR

LOCATION OF BHIWADI I & II ( PROPOSED )

400 KV BUS-I

400 KV BUS-II

CONTROL

ROOM

250 MVA ICT-I

250 MVA ICT-II

250 MVA ICT-III 400 KV HISAR-II 220 KV BUS-I 220 KV BUS-II 400 KV HISAR-I

50 MVAR BUS REACTOR

220 KV BUS-I 220 KV BUS-II

IPS Al BUS on BPIs C Existing Conductor Bus D

BUS COUPLER

220 KV TRANSFER BUS

220 kV TBC BAY

220 kV PSEB-III

ICT-I BAY

220 kV PSEB-IV

220 kV PSEB-I

220 kV PSEB-II

ICT-II BAY

ICT-III BAY

Switchyard Fencing

220 kV PSEB-V

220 kV PSEB-VI

220 KV ICT- IV

220 kV SHORT LINE

Approx. length 50 m

Conductor Bus B

220 kV SHORT LINE

MOGA SUBSTATION AUGMENTATION : ICT-IV & ASSOCIATED 220 KV BAYS, 400 KV BHIWADI-I&II LINES
50 MVAR BUS REACTORE 400 KV KISHENPUR-I 400 KV JALANDHAR-I 400 KV JALANDHAR-II 400 KV KISHENPUR-II 400 KV BHIWADI-I 400 KV BHIWADI-II SPARE

41452 41489B 41489R

41489RE

13

41389T1 41352 41389T1E 41489BE

41289LE 41289L 41389T2

41289R

4189LE1 4189L 4389T1 4389T1E

3
4352

41589RE

63 MVAR LINE REACTOR

63 MVAR LINE REACTOR

41689T1E

41389T2E 41289BE

41289B 4189B 4189BE1

41289RE

4289LE 4289L 4189T2 4389T2E 4289B 4289BE1

41589L 41589LE 41689T1

16
41652

41589R

41789LE 41789L 41689T2 41689T2E

41989LE 41989L 42089T1

20

42089T2

41589B 41589R 41589BE

LOCATION 41789BE 41789B OF BHIWADI I & 17 II ( PROPOSED ) 41752

41789AE 41789A

42089T1E 42052 41989B 41989BE

42089T2E

14
41489AE 41489A

15
4252 41589AE 41589A

19
41952 41989AE 41989A 42189AE 42189A

41289AE 41289A

12

41252

4152

1
4189AE1 4189A 4189AE2 400 KV BUS-I
400 KV BUS-II

2
4289AE2 4289A 4289AE2

41552

4989A 4989AE 4952

41089A 41089AE 41889A 41889AE 41852

4589A 4589AE 4552

4489A 4489AE

4689A 4689AE

9
41189T1E 4989BE

10 11
41152
1 MVA 33/0.433 kV

41052

18
4889T2E

5 8
4589AE 4889T1E 4889T1 4589LE

4452 4589L 4589A 4489L 4489B

4
4789T2E

6 7

4652

CONTROL

ROOM

4989B 41189T1 4989C 4989CE

250 MVA ICT-I

41089BE 41189T2E

41189BE 41089B 41889BE 41089C 41089CE 41889C

4489BE

4689BE 4789T1E 4789T1 4689B 4689C 4689CE

4852 4889T2 41889CE

4789T2

41189T2

4752 4489LE

ISOL:KEP

250 MVA ICT-II

25 MVAR Ter. ReactorII

250 MVA ICT-III 400 KV HISAR-II

250 MVA ICT-IV

25 MVAR Ter. Reactor-I

CGL

Existing 220 KV Conductor BUS-I Existing 220 KV Conductor BUS-II

Approx. 50m

400 KV HISAR-I

A IPS Al pipe on BPIs C

Proposed 220 KV Conductor BUSI Proposed 220 KV Conductor BUS-II

2189A 2189E1 2152

2189B

2989A

2289A 2789A 2189B 2789E1 2

BUS COUPLER

2189E2 2189C

2752 2452 9 2952 2652 2852 2552 2389E2 235 2/889E2 2689E2 2 2489E2 2589E2 2789L 2989E2 2389T 2889L 2489L 2689T 2589L 2989T 2789E3 2889E3 2389E3 2689E3 2989E3 2489E3 2389C 2689C 2789C 2889C 2589C 2989C 2489C 220 KV TRANSFER BUS 2252 2789E2
ICT-I BAY ICT-II BAY ICT-III BAY

2189E1

2789B 2389B 2889B 2489A 2589A 2589B 2389A 2889A 2489B 2889E1 2389E1 2489E1 2589E1 2689E1

2689A

2689B

2989B

2989E1

21089A 21089E1

21189A 21289A 21289B 21089B 21189B 21289E1 21189E1 21052 21152 21189E2 21289E2 21189L 21289T 21189E3 21289E3 21189C 21289C 21252

21089E2 21089L 21089E3 21089C

220 kV TBC BAY

220 kV PSEB-III

220 kV PSEB-IV

220 kV PSEB-I

220 kV PSEB-II

Switchyard Fencing

220 kV PSEB-V

220 kV PSEB-VI

220 KV ICTIV

SINGLE LINE DIAGRAM OF 220kV DMT SCHEME

400 KV BUS-I 400 KV BUS-II

4989A 4989AE 41089AE

41089A

4952 1000-500/1A 4989BE 41189T1E 4989B 41189T1 4989C 4989CE 1000-500/1A 41152 41089CE 1000-500/1A 41089BE 41189T2E

41052

41089B 1000-500/1A

41089C

250 MVA ICT-I

250 MVA ICT-I I

220 KV BUS-I

220 KV BUS-I I
2189A 2189B 2189E1 2152 2289E1 1000-500/1A BUS COUPLER 1000-500/1A 2389E2 2389T 2489E2 2489L 2689E2 2689T 2289A 2252 2389E1 2352 2489E1 2452 2289B 2389A 2389B 2689A 2489B 2689E1 2652 2689B

2489A

2189E2 2389E3 2189C 2389C 1000-500/1A 2489E3 2489C 2689E3 2689C 1000-500/1A

220 KV TRANSFER BUS

1000-500/1A

ICT-I BAY

220 kV PSEB-I

ICT-I I BAY

SINGLE LINE DIAGRAM OF 220kV DMT SCHEME WITH 245kV CT RELOCATED

400 KV BUS-I 400 KV BUS-II

4989A 4989AE 41089AE

41089A

4952 1000-500/1A 4989BE 41189T1E 4989B 41189T1 4989C 4989CE 1000-500/1A 41152 41089CE 1000-500/1A 41089BE 41189T2E

41052

41089B 1000-500/1A

41089C

250 MVA ICT-I

250 MVA ICT-I I

220 KV BUS-I

220 KV BUS-I I
2189A 2189B 2189E1 2152 2289E1 1000-500/1A BUS COUPLER 1000-500/1A 2389E2 2289A 2252 2389E1 2352 1000-500/1A 2389T 2489E1 2452 1000-500/1A 2489E2 2489L 2689E2 2289B 2389A 2389B 2689A 2489B 2689E1 2652 1000-500/1A 2689B

2489A

2689T

2189E2 2389E3 2189C 2389C 2489E3 2489C 2689E3 2689C 1000-500/1A

220 KV TRANSFER BUS

1000-500/1A

ICT-I BAY

220 kV PSEB-I

ICT-I I BAY

CABLE TRENCH
Section Inner Dim Racks

Section 1 - 1 Section 2 - 2 Section 3 3 Section 4 4

1.95 m 1.05 m 0.75 m 0.40 m

5 both sides 3 one side 2 one side 1 one side

ERECTION, TESTING & COMMISSIONING OF CT & CVT (UP TO PRECOMMISSIONING CHECKS)

17.02.2009 (11:30 TO 12:30)
MANOJ KUMAR, MANAGER (S/S), MOGA

ERECTION OF CVT
INTRODUCTION
Devices used to get the replica of primary voltage which shall be suitable for measuring instruments and protective relays. No. of cores as per requirement CVTs used generally above 220kV for economic reasons also obviates need for separate coupling capacitor for PLCC

Pre Commissioning Tests of CT

Polarity Test Magnetization Curve Test Ratio Test Primary Current Injection Test Secondary Current Injection Test