1. 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
2. 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
3. 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
4. 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 .
5. Major factors deciding a layout …
Standard factors
Electrical clearances
Heights of different levels &
electric field
Variable factors
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
6. General Arrangement
Following factors determine the switchyard area
Conventional (AIS) OR GIS
D Type OR I Type Layout
Automation (SAS) OR without Automation
7. 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)
9. 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
10. Minimum Clearances for Layout (at
altitude <1000m above mean sea level)…
Voltage Level
(Rated)
Ph-Ph
(mm)
Ph-E
(mm)
Sectional
Clearance (mm)
765 kV 7600 4900 10300
400 kV 4000 3500 6500
220 kV 2100 2100 5000
132 kV 1300 1300 4000
110 kV 1100 1100 3800
66 kV 630 630 3500
33 kV 320 320 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.
11. 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
12. Bay widths & levels…
Voltage
Level
Bay
width
First
Level
Second
Level
Third
level
BIL
kVp
SIL
kVp
765 kV 38m 14m 27m 39m 2100 1550
400 kV 27/24m 8m 15m 22m 1550 1050
220 kV 18/16m 5.9m 11.7m 16.2m 1050 650
132 kV 12m 4.6m 7.5m 10.8m 650 NA
66 kV 7.6m 4m 6m 9.5m 325 NA
Ligtning Impulse : 1.2/50 micro sec
Switching Impulse: 250/2500 micro sec
15. STANDARD CLASSIFICATION OF TOWERS
Tower
Type
Height
First
Level
Height
Second
Level
Peak Angle of
Deviation
End /Middle
TA 15 m NIL 7.5m ±30 deg End
TB 15 m NIL 7.5m ±30 deg Middle
TC 15 m NIL NIL 0 deg End
TD 15 m NIL NIL 0 deg Middle
TE 15 m NIL 7.5m 0 deg End
TF 15 m NIL 7.5m 0 deg Middle
TG 22 m NIL 7.5 m ±30 deg End
TH 22 m NIL 7.5 m ±30 deg Middle
TI 22 m NIL 7.5 m 0 deg End
TJ 22 m NIL 7.5 m 0 deg Middle
TK 15 m 7 m 7.5 m 0 deg Corner/ 2beams
TL 15 m 7 m 7.5 m 0 deg Middle/ 3beams
TM 15 m 7 m 7.5 m ±30 deg Corner/ 2beams
TN 15 m 7 m 7.5 m ±30 deg Middle/ 3beams
Wind Zone : 47m/Sec
400kV
16. NON-STANDARD TOWERS (MOGA)
Tower Type Description
400kV
TG Beam at 15 m with peak 23m
TSP Beam at 23m with peak 30 m
G5 Beam at 15m (Twin Moose)
GSP Beam at 23m
220kV
TA Beam at 11m
TB Beam at 11m & 17.5m
TC Beam at 11m & 17.5m with peak 22m
G1 Beam at 11m (Single Moose)
G2 Beam at 11m (Twin Moose)
G3 Beam at 17.5m (Single Moose)
17. Typical dimensions between
equipments…
400 kV 220 kV 132 kV 66 kV
CB&ISO 10.5 m 6.5 m 3.75m 3 m
ISO&CT 7 m 4 m 2.5 m 2 m
CB&CT 7 m 3m+road+5 m 2.5 m 2 m
Gantry Tower
&ISO
6 m 3.5 m 1.8 m 1.8 m
SA &PI& CVT 6 m 3.5 m 2.5 m 2 m
LA & SR 7 m - - -
Road & SR 15 m - - -
18. 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
19. 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
20. Miscellaneous
Placement of
LT Station (ACDB, DCDB, Battery Bank &
Battery Chargers)
Diesel Generator Set with AMF Panel
Security hut
Office Buildings
Other residential buildings
21. 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
22. Bus Bar Switching Schemes
Bus Bar Switching Schemes…
…
Factors dictating choice of bus switching scheme
1) Reliability
No Power interruption during Bus fault
2) CB Maintenance
No Power interruption during CB maintenance. Taking
out CB for maintenance shall be easy
3) Bus Bar Maintenance
No Power interruption during Bus bar maintenance
23. Bus Bar Switching Schemes
Bus Bar Switching Schemes…
…
4) Simplicity of protection arrangements
Protection arrangements shall be simple for easy
commissioning and regular checking
5) Ease of Extension
Extension of Bus bar necessary to take care of future
expansion. Power interruption during such extension
works.
6) Cost
Optimal techno-economic solution
24. Bus Switching Schemes
Bus Switching Schemes…
…
Single Main Bus Scheme
Single Main Bus Scheme
–
– with sectionaliser & without sectionaliser
with sectionaliser & without sectionaliser
Single Main & Transfer Bus Scheme
Single Main & Transfer Bus Scheme
Double Main Bus Scheme
Double Main Bus Scheme
Double Main with by-pass isolator Bus
Double Main with by-pass isolator Bus
scheme
scheme
Double Main & Transfer Bus Scheme
Double Main & Transfer Bus Scheme
One & Half Breaker Bus Scheme
One & Half Breaker Bus Scheme
Double bus two breaker Scheme
Double bus two breaker Scheme
Ring Bus Scheme
Ring Bus Scheme
25. Simplest and cheapest
Simplest and cheapest
bus bar scheme
bus bar scheme
Maintenance and
Maintenance and
extensions of bus bars are
extensions of bus bars are
not possible without
not possible without
shutdown of the
shutdown of the
substation.
substation.
Operation & maintenance
Operation & maintenance
of bus bar is easy
of bus bar is easy.
SINGLE BUS SCHEME
SINGLE BUS SCHEME
27. Similar to the single bus scheme
Similar to the single bus scheme
except the sectionalising breaker
except the sectionalising breaker
or isolator.
or isolator.
By keeping the sectionaliser open
By keeping the sectionaliser open
one section can be in service and
one section can be in service and
the other can be taken for
the other can be taken for
maintenance or extension.
maintenance or extension.
If a bus section breaker is
If a bus section breaker is
provided busbar protection can
provided busbar protection can
detect fault on any section and trip
detect fault on any section and trip
the breakers connected to that
the breakers connected to that
section and isolate it.
section and isolate it.
SINGLE BUS WITH SECTIONALISER
SINGLE BUS WITH SECTIONALISER
28. Individual CB can be taken out for
Individual CB can be taken out for
maintenance on-load at a time.
maintenance on-load at a time.
The transfer bus coupler acts as the
The transfer bus coupler acts as the
breaker for the circuit under by
breaker for the circuit under by
pass.
pass.
Individual circuits have a bypass
Individual circuits have a bypass
isolator to connect to the transfer
isolator to connect to the transfer
bus and this isolator will be closed
bus and this isolator will be closed
during bypass operation of that
during bypass operation of that
particular circuit.
particular circuit.
SINGLE MAIN AND TRANSFER SCHEME
SINGLE MAIN AND TRANSFER SCHEME
29. Load will be distributed on both the buses
Load will be distributed on both the buses
and the bus coupler shall be normally
and the bus coupler shall be normally
closed.
closed.
For maintenance & extension of any one of
For maintenance & extension of any one of
the buses the entire load will be transferred
the buses the entire load will be transferred
to the other bus.
to the other bus.
On load transfer of a circuit from one bus to
On load transfer of a circuit from one bus to
the other bus is possible through bus
the other bus is possible through bus
isolators provided the bus coupler is closed
isolators provided the bus coupler is closed
and thereby two buses are at the same
and thereby two buses are at the same
potential.
potential.
On load bypassing of any circuit for breaker
On load bypassing of any circuit for breaker
maintenance is not possible
maintenance is not possible.
DOUBLE BUS SCHEME
DOUBLE BUS SCHEME
30. DOUBLE BUS WITH BY-PASS SCHEME
DOUBLE BUS WITH BY-PASS SCHEME
31. This bus arrangement provides the facilities of a double
This bus arrangement provides the facilities of a double
bus arrangement & a main and transfer bus
bus arrangement & a main and transfer bus
arrangement.
arrangement.
The bus to which the transfer bus isolator is connected
The bus to which the transfer bus isolator is connected
can be used as a transfer bus also.
can be used as a transfer bus also.
During the time a circuit is under bypass, the bus
During the time a circuit is under bypass, the bus
coupler will act as the breaker for the bypassed circuit.
coupler will act as the breaker for the bypassed circuit.
DOUBLE BUS WITH BY-PASS SCHEME
DOUBLE BUS WITH BY-PASS SCHEME
33. In this bus scheme, in addition to
In this bus scheme, in addition to
the two main buses there will be a
the two main buses there will be a
separate transfer bus also.
separate transfer bus also.
Since separate transfer bus is
Since separate transfer bus is
available there will be no need of
available there will be no need of
transferring the load from one bus
transferring the load from one bus
to the other bus unlike in a double
to the other bus unlike in a double
main cum transfer bus
main cum transfer bus
arrangement.
arrangement.
Other features are similar to the
Other features are similar to the
one described in double bus with
one described in double bus with
by pass arrangement.
by pass arrangement.
DOUBLE MAIN AND TRANSFER SCHEME
DOUBLE MAIN AND TRANSFER SCHEME
34. In this scheme, two circuit have three
In this scheme, two circuit have three
breakers, the middle breaker ties the
breakers, the middle breaker ties the
two circuits and hence is called the tie
two circuits and hence is called the tie
breaker.
breaker.
Breaker or bus maintenance is
Breaker or bus maintenance is
possible without any shut down of the
possible without any shut down of the
feeder
feeder
Even if both the buses are out of
Even if both the buses are out of
service, power can be transferred from
service, power can be transferred from
one feeder to another feeder through
one feeder to another feeder through
tie breaker
tie breaker
BREAKER AND HALF SCHEME
BREAKER AND HALF SCHEME
35. Each feeder is controlled by two
Each feeder is controlled by two
breakers.
breakers.
This arrangement is
This arrangement is
comparatively costlier than other
comparatively costlier than other
scheme and hence followed in
scheme and hence followed in
very important circuit only.
very important circuit only.
In this arrangement breaker
In this arrangement breaker
maintenance for any feeder
maintenance for any feeder
circuit is easily possible without
circuit is easily possible without
any shutdown
any shutdown.
.
DOUBLE BUS TWO BREAKER SCHEME
DOUBLE BUS TWO BREAKER SCHEME
36. As long as the ring is closed load
As long as the ring is closed load
has two sources of supply and
has two sources of supply and
any circuit breaker can be taken
any circuit breaker can be taken
out of service without affecting
out of service without affecting
the supply.
the supply.
Extension of ring scheme is
Extension of ring scheme is
difficult.
difficult.
No bus bar protection required
No bus bar protection required.
.
RING BUS SCHEME
RING BUS SCHEME
37. Bus Switching Selection
Bus Switching Selection
considerations…
considerations…
Reliability
Reliability
Operation Flexibility
Operation Flexibility
Ease of Maintenance
Ease of Maintenance
Short Circuit Level Limitation
Short Circuit Level Limitation
Simplicity of Protection Arrangement
Simplicity of Protection Arrangement
Ease of Future expansion
Ease of Future expansion
Land availability
Land availability
Cost
Cost
39. 800 / 400 / 220 KV
MOGA SUBSTATION
1065 MVA
(4 ICTs & 3 Reactors)
800 KV KMTL-2
49.212 km
(Loc 602-730)
800 KV KMTL-1
51.343 km
(Loc 581-710)
400 KV D/C JMTL
52.232 km
(Loc 510-647)
400 KV D/C MHTL & MFTL
120.465 km
(Loc 1- 321)
TRANSMISSION NETWORK OF MOGA SUBSTATION
220 KV D/C PSEB
Jagraon-I&II
(35km)
400 KV D/C MOGA -
Bhiwadi 352 km
(under const.)
NRSSS-V
+ 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-I&II
(400mtr)
220 KV D/C PSEB
MOGA-III &IV
(400 mtr)
765 KV S/C
Bhiwani - MOGA
40. 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
42. 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
43. 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
44. 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)
A. TOTAL AREA : 70.25 Acers
1. 400 KV SWITCHYARD : 31.60 Acres
2. TOWNSHIP BUILT-UP AREA : 13.77 Acres
3. TOWNSHIP OPEN AREA : 24.88 Acres
45. ICT-I BAY
220 kV
PSEB-I I I
220 kV
PSEB-IV
220 kV
PSEB-I
220 kV
PSEB-I I
400 KV BUS-I
400 KV BUS-I
I
220 KV BUS-I
220 KV BUS-I I
220 KV TRANSFER BUS
ICT-I I
BAY
ICT-I I I
BAY
250 MVA
ICT-I
250 MVA
ICT-I I
250 MVA
ICT-I I I
400 KV
KISHENPUR-I I
400 KV
JALANDHAR-I I
400 KV
JALANDHAR-I
400 KV
KISHENPUR-I
400 KV
FATEHABAD
400 KV
HISAR
BUS
COUPLER
220 kV
TBC BAY Switchyard Fencing
CONTROL
ROOM
SINGLE LINE DIAGRAM OF 400 / 220 KV MOGA SUBSTATION (WITH FUTURE PLAN)
63 MVAR
LINE
REACTOR
63 MVAR
LINE
REACTO
R
25 MVAR
Ter. Reactor-I
25 MVAR
Ter. Reactor-I I
1 MVA
33/0.433 kV
Bhiwadi-I
41489A
41489A
E
41389T
2
41389T2
E
41352
41389T1E
41389T
1
1000-
500/1A
41289B
E
41289B
41289A
41289A
E
41252
41289L
41289L
E
41289R
41289R
E
4189LE
4189L
4389T1
4189B
4189BE
4152
4189AE
1
4189A
4389T1
E
4352
4389T2
4389T2
E 4289BE
4289B
4252
4289A
4289AE
1
4289L
4289LE
41589R
41589R
E 41652
41552
41589B
41589B
E
41589A
E
41589A
41589L
41589L
E
41689T
1
41689T1
E
41689T2
E
41689T
2
4989A
4189AE
2
4289AE
2
4989AE
4989B
4989BE
4952 41052
41152
4989C
4989CE
41189T
1
41189T1
E
41189T2E
41089B
E
41089B
41089A
41089A
E
41089C
41089C
E
41889A 41889A
E
41852
41889B
41889B
E
4852
4889T2
4889T2
E
4889T1
4889T1
E
4552
4589A
4589AE
4589BE
4589B
4589L
4589LE
41889C
E
41889C
4689A
4689B
4689C
2152
2252
2752 2352 2852 2452 2552 2652 2952
2189A
2189B
2189C
2289A 2289B 2789A
2789B
2789C
2789L
2389A
2389B
2389T
2889A
2389C
2889B
2889C
2889L
2489A
2489B
2489C
2489L
2589A
2589B
2589C
2589L
2689A
2689B
2689T
2689C
2989A
2989B
2989C
2989T
2189E1
2189E2
2289E1 2789E1
2789E2
2789E3
2389E1
2389E2
2389E3
2889E1
2889E2
2889E3
2489E1
2489E2
2489E3
2589E1
2589E2
2589E3
2689E1
2689E2
2689E3
2989E1
2989E2
2989E3
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A 1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
1000-
500/1A
4489A
4489AE
4452
4489BE
4489B
4789T2 4752
4652
4789T2
E
4789T1
E
4789T1
4689AE
4689BE
4689CE
1000-
500/1A
1000-
500/1A
1000-
500/1A
Bhiwadi-II
220 kV
Jagraon-I
ICT-I V
BAY
41452
1000-
500/1A
41489B
E
41489B
50 MVAR
BUS
REACTOR
41489R
E
41489R
315 MVA
ICT-IV
Spare
220 kV
Jagraon-II
41789A
41789A
E
63 MVAR
LINE
REACTO
R
63 MVAR
LINE
REACTO
R
41952
42052
42189A
42189A
E
41989A
E
41989A
41989B
E
41989B
42089T
1
42089T
2
42089T2E
42089T1E
41989L
41989L
E
42089R
42089R
E
41789B
41789B
E
41752
41789L
41789L
E
41789R
41789R
E
21052 21152 21252
21089A
21089B
21089C
21089T
21089E
1
21089E
2
21089E
3
1000-
500/1A
1000-
500/1A
1000-
500/1A
21189C
21189E
3
21189E
2
21189A
21189B
21189E
1
21289A
21289B
21289E
1
21289C
21289E
3
21289T
21289E
2
21189T
50. ICT-I BAY
220 kV
PSEB-III
220 kV
PSEB-IV
220 kV
PSEB-I
220 kV
PSEB-II
220 KV
ICT- IV
400 KV BUS-I
400 KV BUS-II
220 KV BUS-I
220 KV BUS-II
220 KV TRANSFER BUS
ICT-II BAY ICT-III BAY
250 MVA
ICT-I
250 MVA
ICT-II
250 MVA
ICT-III
50 MVAR
BUS
REACTOR
400 KV
KISHENPUR-II
400 KV
BHIWADI-I
400 KV
BHIWADI-II
400 KV
JALANDHAR-II
400 KV
JALANDHAR-I
400 KV
KISHENPUR-I
SPARE
220 kV
PSEB-VI
400 KV
HISAR-II
400 KV
HISAR-I
250 MVA
ICT-IV
220 kV
PSEB-V
BUS COUPLER
220 kV
TBC BAY
Existing 400 kV
D/C Dead End
Tower
Switchyard Fencing
CONTROL
ROOM
MOGA SUBSTATION AUGMENTATION OF EXISTING TRANSFORMATION CAPACITY - INSTALLATION OF ICT-IV AND ASSOCIATED BAYS
LOCATION OF
BHIWADI – I & II
( PROPOSED )
220
kV
SHORT
LINE
63 MVAR
LINE
REACTOR
63 MVAR
LINE
REACTOR
220
kV
SHORT
LINE
A
C D
B
IPS Al BUS on BPIs
220 KV BUS-I
220 KV BUS-II
Existing
Conductor Bus
Conductor Bus
Approx. length 50 m
52. SINGLE LINE DIAGRAM OF 220kV DMT SCHEME
ICT-I BAY
220 kV
PSEB-I
400 KV BUS-I
400 KV BUS-II
220 KV BUS-I
220 KV BUS-I I
220 KV TRANSFER BUS
ICT-I I
BAY
250 MVA
ICT-I
250 MVA
ICT-I I
BUS COUPLER
4989A
4989AE
4989B
4989BE
4952 41052
41152
4989C
4989CE
41189T1
41189T1E 41189T2E
41089BE
41089B
41089A
41089AE
41089C
41089CE
2152
2252
2352 2452 2652
2189A
2189B
2189C
2289A 2289B 2389A
2389B
2389T
2389C
2489A
2489B
2489C
2489L
2689A
2689B
2689T
2689C
2189E1
2189E2
2289E1 2389E1
2389E2
2389E3
2489E1
2489E2
2489E3
2689E1
2689E2
2689E3
1000-500/1A
1000-500/1A 1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
53. SINGLE LINE DIAGRAM OF 220kV DMT SCHEME WITH 245kV CT RELOCATED
ICT-I BAY
220 kV
PSEB-I
400 KV BUS-I
400 KV BUS-II
220 KV BUS-I
220 KV BUS-I I
220 KV TRANSFER BUS
ICT-I I
BAY
250 MVA
ICT-I
250 MVA
ICT-I I
BUS COUPLER
4989A
4989AE
4989B
4989BE
4952 41052
41152
4989C
4989CE
41189T1
41189T1E 41189T2E
41089BE
41089B
41089A
41089AE
41089C
41089CE
2152
2252
2352 2452 2652
2189A
2189B
2189C
2289A 2289B 2389A
2389B
2389T
2389C
2489A
2489B
2489C
2489L
2689A
2689B
2689T
2689C
2189E1
2189E2
2289E1 2389E1
2389E2
2389E3
2489E1
2489E2
2489E3
2689E1
2689E2
2689E3
1000-500/1A
1000-500/1A 1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
1000-500/1A
55. CABLE TRENCH
Section Inner Dim Racks
Section 1 - 1 1.95 m 5 both sides
Section 2 - 2 1.05 m 3 one side
Section 3 – 3 0.75 m 2 one side
Section 4 – 4 0.40 m 1 one side
56. ERECTION, TESTING &
COMMISSIONING OF
CT & CVT (UP TO PRE-
COMMISSIONING CHECKS)
17.02.2009 (11:30 TO 12:30)
MANOJ KUMAR, MANAGER (S/S), MOGA
57. ERECTION OF CVT
ERECTION OF CVT
INTRODUCTION
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
58. Pre Commissioning Tests of CT
Polarity Test
Magnetization Curve Test
Ratio Test
Primary Current Injection Test
Secondary Current Injection
Test
