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


INTERLOCKS• Trips when both Incomers

from station transformer are ON in service position with trip selection in buscoupler..

PERMISSIVES


• E/F Relay


•No elect trip from Incomer from station transformer


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


• 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


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


• E/F Relay (51) -CDG

• IDMT O/C: R,Y,B, phases.

•Unit synchronised.

•No elect trip from TIE incomer.


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


Inst.O/C. R, Y, B -phases

Earth Fault


INCOMER - A

INCOMER - B



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


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.


PERMISSIVES

1 No Elect. trips from Inst.O/C relay R,Y,B-phases



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 – 3A & 3B 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


UNIT-3

A: DC SOURCES FOR




415 V UNIT SWGR – 2A & 2B STANDBY

EMCC I/C-1

EMCC I/C –2

ESP SWGR


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


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


• E/F Relay


•No elect trip from any of the Incomers.


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

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