Download - ELECTRICAL SYSTEMS
AUX. SUPPLY
The service voltage which we are adopted in RSTPS are 11KV, 6.6KV , 415V 3PH AC supply and 240V 1PH AC supply.
11KV for Stage 2/3 MDBFPs.
6.6KV for station/unit HT auxiliaries like BFP s (stage-I), Mills, ID/FD/ PA fans, CEPS, CW, RW Pumps & IAC/PAC etc.
415V for station aux like BAHP/FALP, Service water pumps, unit aux like Seal Air fan, Lube oil pumps, AC seal oil pumps and Centrifuge etc.
240V supply for lighting and welding.
These supplies are fed through the different switchgears
What are switchgears?
The equipment which normally fall in this category are:
Circuit Breakers
Isolators
Load break switches
Earth switches
Switch fuse units etc.
The switchgears are fed through different transformers
Transformer
Generator Transformer
Tie Transformer
The generator is connected to this transformer by means of bus ducts. This transformer is used to step up the generating voltage of 18 / 21 KV to 400 KV . This transformer is provided OFAF cooling and Off load tap changer.
There are total 4 No. of Tie Transformers are provided for feeding supply for internal requirements. It steps down 400 KV to 33KV This transformer is provided OFAF cooling and Off load tap changer.
Station TransformerThe station transformer is required to feed power to the auxiliaries during start-ups, and C- auxiliaries when unit is in service., This transformer is normally rated for initial auxiliary load requirements of unit.It is provided with On load tap changer to cater to the fluctuating voltage of the grid.
Unit Auxiliary TransformerThe UAT draws its power from the main bus duct-connecting Generator to the GT. The total KVA capacity of unit Auxiliary transformer require can be determined by assuming 0.85 power factor and 0,9 efficiency for total load with a safe margin of 20%. It is provided with On load tap changer to cater to the fluctuating voltage of the grid.
Transformers
BREAKER
TRANSFORMER
ISOLATOR
SWITCH CUM FUSE UNIT
FUSE
CONTACT
400 KV LINE
33 KV LINE
11 KV LINE
6.6 KV LINE
415 V LINE
220 DC LINE
5
SYMBOLS
33KV SWITCHGEAR
UNIT # 1 GEN
400 KV BUS # 2
400 KV BUS # 1
ST # 6
ST # 3 ST # 4
ST # 5
TIE # 175 MVA400/33 KV
SEC # A SEC # B
SEC # C SEC # D SEC # E ~~
GT # 521/400 KV TIE # 2
75 MVA400/ 33 KV
TIE # 3100MVA400/ 33 KV
6
TIE # 4100 MVA400/ 33 KV
~~
GT # 1240 MVA18/400 KV
UNIT # 5 GEN
ST # 1 ST # 2 ST #7
SEC #F
TIE # 2400/33 Kv
75 MVA
TIE # 1400/33 Kv
75 MVA
spar
e
WT
P -
2
CW
- 1 ST
- 1
CH
P A
UG
-1
ST
- 6
CO
L-3
SW
YD
- 1
TIE
TO
SE
C -
F
CO
L -
2
WT
P -
1
CW
- 2
ST
- 2
CH
P A
UG
-2
CO
NS
T-2
TIE
TO
SE
C –
E
SW
YD
- 2
SEC-A SEC-BB/C
33 KV STAGE-I SWITCHGEAR
7
33 KV MERRYLIN-
GERRIN
MAKE SF6
ASH
SL
UR
RY
LT
G
TIE
TO
1C
W1
UN
IT S
WG
R-
1B
UN
IT S
WG
R-
2B
AIR
CO
MP
- A
FO L
TG
CH
P -
B
ASS
- 1
DA
ET
P -
1
UN
IT S
WG
R –
3A
SPA
RE
UN
IT S
WG
R –
1A
DA
ET
P -
2
UN
IT S
WG
R –
2A
ST –1
33 / 6.6 KV
19 / 25 / 31.5 MVA
ST –2
33 / 6.6 KV
19 / 25 / 31.5 MVA
STLT-4
6.6 / 0.433
1.65 MVA
STLT-3
6.6 / 0.433
1.65 MVA
STLT-1 6.6 / 0.433
1.65 MVA
STLT-2 6.6 / 0.433
1.65 MVA
AIR
CO
MP
SWG
R -
B
CH
P -
A
AS
XM
ER
-2
U
NIT
SW
GR
- 3B
6.6 KV STATION SWITCHGEAR
B/C
1S1/2S1
B/C
1S2 / 2S2
1S11S2
2S1 2S2
ASH
XM
ER
-3
STN LT SWGR - 1 STN LT SWGR - 2
SEC-A SEC-B SEC-A SEC-B
8
NOTE: ALL SECTIONS HAVE BUS VTS
LINE PT PANELS ARE AVAILABLE IN 1S1 & 2S2
6.6 KV STATION SWITCHGEARINCOMER FROM STATION TRANSFORMER
PROTECTIONS Remote trip Local trip Mech.trip Elect.trips from
• E/F Relay
• IDMT O/C: R,Y,B phases. INTERLOCKS Station transformer HT breaker
trip. Trips when Incomer from station
transformer and buscoupler is ON in service position with trip selection in this incomer.
PERMISSIVES
• 33 KV side charged.
• No elect trip from
• E/F Relay
• IDMT O/C: R,Y,B phases.
•No elect trip from Buscoupler.
• No Continuous close command
64
6.6 KV STATION SWITCHGEARBUSCOUPLER
PROTECTIONS
Remote trip Local trip Mech.trip Elect.trips from
• E/F Relay
• IDMT O/C: R,Y,B phases.
INTERLOCKS• Trips when both Incomers
from station transformer are ON in service position with trip selection in buscoupler..
PERMISSIVES
• No elect trip from
• E/F Relay
• IDMT O/C: R,Y,B phases.
•No elect trip from Incomer from station transformer
• No Continuous close command
65
6.6 KV UNIT SWGR # A
6.6 KV UNIT SWGR # B
UT # A25 MVA18/6.6KV
6.6KV UNIT SWITCHGEAR
200MW GEN
400KV BUS # 1400KV BUS # 2
UT # B25 MVA18/6.6KV
FROM 1S2 / 1S2 / 1S1
(UNITS 1 / 2 / 3 )
FROM 2S1 / 2S1 / 2S2
(UNITS 1 / 2 / 3 )
GT
18 / 400 KV
240 MVA
14
6.6 KV UNIT SWITCHGEAR.TIE INCOMER FROM STATION SWGR.
PROTECTIONS
Remote trip Local trip Mech.trip Elect.trips from
• E/F Relay CTU 12(64)• IDMT O/C Relay – R,Y,B phases
INTERLOCKS Breaker trips when UAT incomer is ON
in service position. Breaker closes on auto from command.
from GRP.
PERMISSIVES
• No elect trip from
• E/F Relay CTU 12(64)
•IDMT O/C Relay – R,Y,B phases
• No elect trip from UAT incomer.
• upstream Isolator / breaker in service / closed
• No Continuous close command
57
6.6 KV UNIT SWITCHGEAR.INCOMER FROM UNIT TRANSFORMER
PROTECTIONS
Local trip Mech.trip Remote trip Elect.trips from
E/F Relay (51) -CDG
• IDMT O/C: R,Y,B, phases. Trip from GRP INTERLOCKS Breaker trips when TIE incomer is
ON in service position
PERMISSIVES
• No elect trip from
• E/F Relay (51) -CDG
• IDMT O/C: R,Y,B, phases.
•Unit synchronised.
•No elect trip from TIE incomer.
• No Continuous close command
58
6.6 KV,
ASEA MAKE MOCB,
CW-I,
COMP-1,
RAW WATER P/H
6.6 KV STAGE-2,
SIEMENS MAKE, VACUUM CB
6.6 KV ABB,SF6,LWTP TRFR 1&2
SEC-A
IAC-1
UNIT LIGHTING XFMR
BFP-C
BFP-A
PA FANS A,C AND E
MILLS A,C AND E
CEP-A
FD-B
ID-B
UAT-A
ESP-A
SEC-B
BFP-C
BFP-B
PA FANS B,D AND F
MILLS B,D AND F
CEP-B
FD-A
ID-A
UAT-B
ESP-B
UNIT-1
SEC-A
IAC-3
UNIT LIGHTING XFMR
BFP-C
BFP-A
PA FANS A,C AND E
MILLS A,C AND E
CEP-A
FD-A
ID-A
UAT-A
ESP-A
SEC-B
BFP-C
BFP-B
PA FANS B,D AND F
MILLS B,D AND F
CEP-B
FD-B
ID-B
UAT-B
ESP-B
UNIT-2
SEC-A
UNIT LIGHTING XFMR
BFP-C
BFP-A
PA FANS A,C AND E
MILLS A,C AND E
CEP-A
FD-A
ID-A
UAT-A
ESP-A
SEC-B
BFP-C
BFP-B
PA FANS B,D AND F
MILLS B,D AND F
CEP-B
FD-B
ID-B
UAT-B
ESP-B
UNIT-3
6.6 KV UNIT SWITCHGEAR
15
HT MOTOR FEEDER
PERMISSIVES No elect trip from
(i) E/F Relay (ii) Inst O/C Relay: R, Y,B Phases
(iii) Lockout rotor (iv) Differential protection IDMT O/C: R, B phases. Overload
EPB released Process permissive No Continuous close command
PROTECTIONS Local trip Remote trip Mech.trip EPB Pressed. Elect.trips from
• E/F Relay• Inst O/C Relay R, Y,B Phases Lockout rotor Differential protection Overload.
Process trips.
INTERLOCKS: Bus under voltage trip
63
TRANSFORMER HT SIDE FEEDER
PERMISSIVES No Elect trip from E/F Relay
IDMT O/C Relay (51) R, Y, B Phases (or) differential protection..
Inst O/C Relay (50) R-Phase Y-Phase B-Phase Wdg.temp high
Transformer oil temp. high Bucholtz trip
No Continuous close command
PROTECTIONS Local trip Mech.trip Remote trip Elect.trips from
E/F Relay IDMT O/C Relay (51) R, Y, B Phases
(or) differential protection.. Inst O/C Relay (50)
R-Phase Y-Phase B-Phase
Transformer oil temp. high Wdg. temp. high Buchholtz trip
THIS IS APPLICABLE TO ESP, UAT , unit ltg, FO ltg, Ash slurry ltg, StationLT , CT LT, WTP LT, switchyard LT, ASH SLURRY TRANSFORMERS HT SIDE BREAKER
62
UAT - A
6.6 / .433 KV
1.6 MVA
TG
MC
C –
A
TG
MC
C –
C
BM
CC
– A
BV
DD
C –
A
TG
MC
C –
B
TG
MC
C –
D
BM
CC
– B
BV
DD
C –
B
SEC-A SEC-BB/C
415V UNIT LT SWITCHGEAR
UAT - B
6.6 / .433 KV
1.6 MVA
SPA
RE
SPA
RE
EMCC
From DG Set
EQ
UIP
ME
NT
S
CH
AR
GE
RS
EM
ER
GE
NC
Y
LT
G
UPS
AL
T
SOU
RC
E
PA F
AN
FL
OP
MC
C
EQUIPMENTS:
TGOP
TURNING GEAR MOTOR
VEF-B
SCANNER AIR FAN-A
APH-A AUX DRIVE
APH-B AUX DRIVE
CHARGERS:
FLOAT MAIN
BOOST CHARGER
UPS CHARGER-A
FROM
UNIT SWGR - A
FROM
UNIT SWGR - B
16
DG SWITCHGEAR
DG SET – 2625 KVA
DG SET – 1625 KVA
415 V LT BUS
TO
UN
IT –
1 E
MC
C
TO
UN
IT –
2 E
MC
C
TO
UN
IT –
3 E
MC
C
TO
SW
YD
25
PERMISSIVES
1 No Elect. trips from
Inst.O/C relay R,Y,B-phases
E/F relay
2 Upstream breaker closed in
service position.
3 No Continuous close command.
4 No Elect. trip from BUS COUPLER
5 Breaker panel door closed
UNIT LT SWITCHGEAR
INCOMER A &B
PROTECTIONS
01 Local trip
02 Remote trip
03 Mech trip
04 Inst O/C trip R,Y,B-phase
E/F relay
INTERLOCKS
01 Trips on Upstream breaker off.
02 Trips on breaker panel door open.
59
PERMISSIVES
1 No Elect. trips from
Inst.O/C. R, Y, B -phases
Earth Fault
2 No Elect. trips from
INCOMER - A
INCOMER - B
3 No Continuous close command.
4 Breaker panel door closed
UNIT LT SWITCHGEAR
BUS COUPLER
PROTECTIONS
1 Local trip
2 Remote trip
3 Mech trip
4 Electrical trips
Inst.O/C. R, Y, B -phases
Earth Fault
INTERLOCKS
01 Trips when Both incomers are ON and in service position
02 Trips on breaker panel door open.
61
UNIT LT SWITCHGEAR FEEDER (BMCC, BVDDC, TG MCC)
PROTECTIONS
1 Mech trip
2 Local trip
2 Overload trip
3 Short circuit trip.
INTERLOCKS
1 Upstream breaker OFF.
2 Trips on breaker panel door open.
PERMISSIVES
1 No Elect. trips from Inst.O/C relay R,Y,B-phases
2 No Continuous close command.
3 Breaker panel door closed
60
415V BOILER MCC
SEC - A SEC - B
SEC-A
MILLS A,C,E LUB OIL PUMPS
-GRAVIMETRIC FEEDERS A,C,E
-PA FANS A,C,E ISOLATING DAMPERS
-ROTARY FEEDERS C,D,E,F,G,H
-LP DOSING-A
-HP DOSING-A
-SEAL AIR FAN-B
-SH STAGE-I LHS AND RHS SPRAY BLOCK V/VS
-AUX PRDS V/V F036
-HPBYPASS OSU-1
-SOOT BLOWER CABINET SUPPLY
-D/A HIGH LEVEL CONTROL BYPASS V/V F046
-CG-A,C
APH-A MAIN MOTOR
SEC-B
MILLS B,D,F LUB OIL PUMPS
-GRAVIMETRIC FEEDERS B,D,F
-PA FANS B,D,F ISOLATING DAMPERS
-ROTARY FEEDERS A,B, I,J,K,L,M,N,O,P
-LP DOSING-B
-HP DOSING-B
-SEAL AIR FAN-A
-SH STAGE-II LHS AND RHS SPRAY BLOCK V/VS
-AUX PRDS INLET V/V F002 AND TIE V/V F010
-HPBYPASS OSU-2
-BOILER DEWATERING CABINET SUPPLY
-CRT MAKE UP CONTROL BYPASS V/V F047
-CG-B,D
-APH-B MAIN MOTOR
-SCANNER AIR FAN-B
-ECO INLET V/V F002
-UPS CHARGER -B
FROM UNIT LT SWGR-A
FROM UNIT LT SWGR-B
400 A400 A
400 A
17
415V BOILER VDDC
SEC - A SEC - B
SEC-A
-START UP VENT F027
-AUX STEAM TO SCAPH-B INLET,OUTLET AND REGULATING /VS F020, F022, F023
-ECO RECIR V/V F005
-FRS 30% INLET AND OUTLET V/VS
-BUNKER GATES A,C,E
-ESP PASS I AND II INLET AND OUTLET DAMPERS
ID-B INLET AND OUTLET DAMPERS
-AUX STEAM TO D/A PREHEATING V/V F046
-SH HEADER VENTS F690,F680 AND F682
-RHS MAIN STEAM STOP V/V F030
CBD ISO V/V F012
-AUX STEAM TO SCAPH-A INLET,OUTLET AND REGULATING /VS F024, F026, F027
-EBD V/VS F017 AND F018
SEC-B
-RH VENT F710
-SH HEADER VENTS F700,F698,F692
-FRS 100% RHS AND MIDDLE INLET AND OUTLET V/VS
-BUNKER GATES B,D,F
-ESP PASS III AND IV INLET AND OUTLET DAMPERS
-ID-A INLET AND OUTLET DAMPERS
-LHS MAIN STEAM STOP V/V F040
-RH ATTEMPERATION BLOCK V/V F095
FROM UNIT LT SWGR-A
FROM UNIT LT SWGR-B
400 A
250 A
250 A
18
415V TGMCC - AFROM UNIT LT
SWGR-ATIE FROM / TO
TGMCC-D
BFP-A,B,C DISCHARGE V/VS AND INTEGRAL BYPASS V/VS
BFP-A,B,C LUB OIL PUMPS
TURBINE SIDE MS STOP V/VS F007 AND F008
MOT CLEAN OIL PUMP AND DIRTY OIL PUMP
CRH DRAIN V/VS F764,F766,F767,F765
LPH-1 INLET,OUTLET AND BYPASS V/VS F020,F021 AND F022
TURBINE AOP
CEP A AND B DISCHARGE V/VS
LP BYPASS DRAIN V/VS F762 AND F763
LP BYPASS OSU 1 AND 2
GSEB A AND B
AUX PRDS OSU
200 A250 A
19
415V TGMCC - BFROM UNIT LT
SWGR-BTIE FROM / TO
TGMCC-C
VEF-A
ESVS AND IVS SEAT DRAINS
HP TURBINE DRAIN V/VS
SEAL STEAM FEED V/V(F001),SHUT OFF V/V(F003) AND UNLOADING V/V(F004) AND BYPASS V/V(F002)
TURBINE PREWARMING V/V F005
CPU INLET AND OUTLET V/V
ARP RELAY CABINET
MOT CENTRIFUGE SUPPLY
UNIT BATTERY CHARGER FLOAT(SB)
800 A 400 A
20
415V TGMCC - CTIE FROM/TO
TGMCC-BFROM UNIT LT
SWGR-A
-SEAL OIL PANEL SUPPLY
-BUS DUCT PRESSURISATION AND HOT AIR BLOWING SUPPLY
-EXCITATION PANLEL SUPPLY
-GT COOLER S/B SUPPLY
-UT-B COOLER MAIN SUPPLY
-UT-A COOLER S/B SUPPLY
-TURBINE SIDE DEWATERING PUMPS PANEL
-EXCITATION THYRISTOR FANS AUX SUPPLY
-EXCITATION FIELD FLASHING SUPPLY
MULSIFIER SYSTEM(MOT AND ROT)
400 A800 A
21
415V TGMCC - DTIE FROM / TO
TGMCC-AFROM UNIT LT
SWGR-B
•AUX STEAM TO SEAL STEAM CONTROL BYPASS V/V
•UT-A COOLER MAIN SUPPLY
•UT-B COOLER S/B SUPPLY
•ALL EJECTORS AIR AND STEAM SIDE V/VS
•ALL HEATERS EXTRACTION STEAM BLOCK V/VS
•HRH LINE DRAINS,MS LINE DRAINS,CRH LINE DRAINS
•GT COOLER MAIN SUPPLY
•HPH 5 AND 6 INLET,OUTLET AND BYPASS V/VS
•TURBINE LUB OIL TEMP CONTROL V/V F023
•HP FLASH TANK ATTEMPERATION V/V F033
•LP BYPASS LINE DRAIN V/V F726,F727
•CPU FLOW CONTROL BYPASS V/V
•EXHAUST HOOD SPRAY BYPASS V/V F020
•CW PASS A AND B INLET AND OUTLET V/VS
•VACUUM BREAKER V/V
•D/A VENT V/V
•ALL HEATERS NORMAL AND ALTERNATE DRIP CONTROL BYPASS V/VS
•CONDENSER MIN RECIRCULATION V/V BYPASS V/V
•HOTWELL LEVEL CONTROL V/V BYPASS V/V
•HOTWELL MAKE UP BYPASS V/V F043
200 A250 A
22
VENTILLATION MCC
AWU C&D BLOWERS AND PUMPS SUPPLY
TG ROOF EXTRACTORS(5 NOS)
C&I DOCK HOUSE
DAS ROOM A/C PACKAGE UNIT
EXHAUST AIR FANS
-VENTILLATION MCC ROOM(2 NOS)
-D/A ROOF EXTRACTORS(2 NOS)
-UNIT BATTERY ROOM(2 NOS)
-BUNKER LEVEL DUST EXTACTION FANS(5 NOS)
AIR WASHER MCC
AWU A AND B BLOWERS AND PUMPS
ARCW PUMPS A AND B
FROM STN LT SWGR
FROM STN LT SWGR
630 A400 A
23
415V ESP SWITCHGEAR
BOARD-ABOARD-B
ESP PASS I AND II FIELDS
ESP PASS I AND II AUX SUPPLY
ESP ZERO FIELD AND AUX PANEL
ESP A/C
ESP A/C PACKAGE UNIT
ESP PASS III AND IV FIELDS
ESP PASS III AND IV AUX SUPPLY
APH FIRE DETECTOR
WELDING SUPPLY(SPARE)
ESP TRF-A
6.6/.433 KV
1.25 MVA
ESP TRF-B
6.6/.433 KV
1.25 MVA
FROM UNIT SWGR-A
FROM UNIT SWGR-B
BC
24
DC SYSTEM OF RAMAGUNDAM
TO OPERATE FROM BATTERIES FOR ATLEAST 60 MINUTES FOLLOWING COMPLETE FAILURE OF ALL AC SUPPLIES
TO OPERATE FROM BATTERIES FOR ATLEAST 10 HRS FOLLOWING FAILURE OF ALL BATTERY CHARGERS
DC LOADS
INSTRUMENTS INDICATIONS, ANNUNCIATIONS &
ALARMS SWITCHGEAR CLOSING & TRIPPING CONTROLS,PROCTECTION & INTERLOCKS TELECOMMUNICATIONS PLCC & PA SYSTEM DC LIGHTING DC DRIVES
DC SYSTEM
BATTERY CHARGERS [TWO/THREE] BATTERY BANKS [ONE/TWO] DC DISTRIBUTION BOARDS [ONE/TWO] DC FUSE BOARDS UN EARTHED SYSTEM CHARGER TROUBLE, DC EARTH FAULT
AND DC VOLTAGE ABNORMAL ALARMS IN UCB
220 V UNIT DCDB
BOOST CHARGER BATTERY BANK FLOAT MAIN FLOAT S/B
EL
EC
TR
OM
AG
NE
TIC
B
OA
RD
-1
TIE
FE
ED
ER
LO
GIC
DB
DC
LT
GAE
LE
CT
RO
MA
GN
ET
IC
BO
AR
D-2
220 V DCDB500 A
X
SW4 SW3SW4 SW4
•CONTACTOR X OPENS ON
BOOST CHARGER ON
TIE FEEDERS TO UNITS:
UNIT- 1: FROM UNIT –2 DCDB
FROM SWYD DCDB SEC-1
UNIT-2 : FROM UNIT – 1 DCDB
FROM UNIT- 3 DCDB
UNIT- 3 : FROM UNIT- 2 DCDBD
C E
OP
ST
AR
TE
R
PA
NL
E
DC
SE
AL
OIL
PA
NE
L
26
UNIT-1
A: DC SOURCES FOR
6.6 KV UNIT SWGR A AND B MAIN
415 UNIT SWGR - A AND B
EMCC I/C-1 & EMCC I/C –2
6.6 KV STN SWGR 1S1 AND 1S2 MAIN
6.6 KV STN SWGR 2S1 AND 2S2 MAIN
415 STN SWGR - 1A AND 1B MAIN
415 STN SWGR - 2A AND 2B MAIN
UNIT-1 MLDB
AIR COMPRESSOR ANNUNCIATION PANEL
6.6 KV COMRESSOR SWGR 1
DG SWGR PANEL-2
ESP SWGR
INTERCOM EMERGENCY SUPPLY
UNIT-2
A: DC SOURCES FOR
6.6 KV UNIT SWGR A AND B MAIN
415 UNIT SWGR - A AND B
6.6 KV UNIT SWGR – 3A & 3B STANDBY
6.6 KV UNIT SWGR – 1A & 1B STANDBY
415 UNIT SWGR - 3A AND 3 B STANDBY
EMCC I/C-1
EMCC I/C –2
ESP SWGR
DC FUSE BOARD – 1
-UCR AC
-STN LT 1 & 2
-STN SWGR IS1 & 2S1
-CSSAEP
DC FUSE BOARD – 2
-STN LT 3 & 4
-STN SWGR IS2 & 2S2
-UNIT – 1 LT SWGR
- DG SWGR
INTERCOM EMERGENCY SUPPLY
UNIT-3
A: DC SOURCES FOR
6.6 KV UNIT SWGR A AND B MAIN
415 UNIT SWGR - A AND B
6.6 KV UNIT SWGR – 2A & 2B STANDBY
415 V UNIT SWGR – 2A & 2B STANDBY
EMCC I/C-1
EMCC I/C –2
ESP SWGR
INTERCOM EMERGENCY SUPPLY
220 V UNIT DCDB SUPPLY DISTRIBUTION
27
ASH SLURRY LT SWITCHGEAR
AS TRF-1
6.6 / .433 KV
1.6 / 2 MVA
SPA
RE
-3 N
OS
H2
PLA
NT
MC
C
AS
SER
IES-
1
AS
SER
IES-
2
FO U
NL
OA
DIN
G
MC
C
AS
SER
IES-
3
CA
NT
EE
N
SUPP
LY
AS
MC
C
SE
RV
IVE
W
AT
ER
MC
C
SEC-A B/C--2B/C-1
AS TRF-3
6.6 / .433 KV
1.6 / 2 MVA
SPA
RE
CH
IMN
EY
MC
C-1
PR
ESS
UR
E P
AR
TS
MA
INT
WO
RK
SHO
P
C
HIM
NE
Y M
CC
-2
SE
AL
WA
TE
R
PUM
P-3
FO
PR
ESS
UR
ISIN
G
MC
C
SP
AR
E
A
S SE
RIE
S 4
A
S SE
IRS-
5
H2
PLA
NT
MC
C
AS TRF-2
6.6 / .433 KV
1.6 / 2 MVA
SEC-C
SEC-B
FROM 1S1 FROM 2S1FROM 2S2
CA
NT
EE
N S
UPP
LY
30
6.6 KV CW SWITCHGEAR
1CW22CW2
2CW11CW1
B/C
B/C
CT
LT
XFM
ER
- 1
AW
&FF
XFM
ER
-1
CW
P/P
-1
CW
P/P
-2
SPA
RE
RA
W W
AT
ER
SW
GR
SE
C-A
CW
P/P
- 5
CW
P/P
- 6
LW
TP
XFM
R -
1
DM
ER
VIC
E
XFM
ER
-1(S
TA
GE
-II)
CT
LT
XFM
ER
-3
WA
GO
N T
IPPL
ER
X
FME
R -
1
WA
GO
N T
IPPL
ER
X
FME
R-2
CW
P/P
-3
CW
P/P
-4
DM
ER
VIC
E X
FME
R-2
ST
AG
E-I
I
CT
LT
XFM
ER
-4
CT
LT
XFM
ER
-2
CW
P/P
-7
AW
&FF
XFM
ER
-2
TIE
TO
RA
W W
AT
ER
SW
GR
SE
C-B
CT
LT
G X
FME
R
RA
W W
AT
ER
P/
P-6
RA
W W
AT
ER
P/
P-3
CW XFMER-1
33 /6.6/6.6 KV
20/25 MVA
CW XFMER-2
33 /6.6/6.6 KV
20/25 MVA
FROM 33 KV SWGR SEC-A
FROM 33 KV SWGR SEC-B
TIE
FR
OM
2S
1 SW
GR
BU
S V
T
BU
S V
T
BU
S V
T
BU
S V
T
LW
TP
XFM
R -
2
37NOTE: ALL SECTIONS HAVE LINE PT CUBICLES
6.6 KV CW1 / CW2 / WTP SWITCHGEARBUSCOUPLER
PROTECTIONS Remote trip Local trip Mech.trip Elect.trips from
• E/F Relay
• IDMT O/C: R,Y,B phases.
INTERLOCKS• Trips when both Incomers are ON
in service position with trip selection in buscoupler.
• Closes on auto if the following conditions are satisfied.
Any incomer trip and No fault on this section
Bus under voltage operated Buscoupler selection in
auto
PERMISSIVES
• No elect trip from
• E/F Relay
• IDMT O/C: R,Y,B phases.
•No elect trip from any of the Incomers.
• No Continuous close command
67
CL
AR
IFIE
D W
AT
ER
PU
MP
- 7
FROM 33 KV SWGR SEC-A
6.6 KV WTP SWITCHGEAR
SEC-A SEC-B
FROM 33 KV SWGR SEC-B
CL
AR
IFIE
D W
AT
ER
PU
MP
- 1
CL
AR
IFIE
D W
AT
ER
PU
MP
- 3
CL
AR
IFIE
D W
AT
ER
PU
MP
- 5
WT
P L
T X
FM
R -
1
SA
TC
OM
XF
MR
- 1
CL
AR
IFIE
D W
AT
ER
PU
MP
- 6
CL
AR
IFIE
D W
AT
ER
PU
MP
- 4
CL
AR
IFIE
D W
AT
ER
PU
MP
- 2
WT
P L
T X
FM
R -
2
SA
TC
OM
XF
MR
- 2
B/C
WTP XFMR-1
33 / 6.9 KV
5 MVA
WTP XFMR-2
33 / 6.9 KV
5 MVA
BU
S V
T
BU
S V
T
SP
AR
E
44
NOTE: BOTH SECTIONS HAVE LINE PT CUBICLES
Indicates breaker in open condition
Indicates breaker in close condition
closed
B/C 2
open
Col I Col II Col IIIRDM I RDM II
From SEC F Sec B Sec A
#1 #2 #3
NEW COLONY SWITCHGEAR AS ON 25/05/05
B/C 1
All Transformers
are 4MVA
THANK YOU