PCC Battery Room:
PCC (Power control Centre) is an important component of Sirajganj power station. It has a
Battery Room rated as 220 Volt DC. The battery room consists of 36 cells rated as 6V/192Ah.
This 220 V is generated from two partial batteries of 110V of 18 cells each connected in series.
The main purpose of battery room is to provide supply to Emergency DC Lube oil Pump (2.6-3.4
KW).
+ 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V -
- 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + =120 V
+ 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V - + 6.69V -
- 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V + - 6.69V +
=120 V
Fig: PCC room battery connection simple presentation
Breaker Room:
Location- Ground floor of GT control room building.
Breakers:
For 6.6 KV bus A section
1. 6.6 KV section A power incoming,
2. 6.6 KV bus section A Potential Transformer
3. No.1 Station Service Transformer
4. Excitation Transformer
5. No.1 Natural Gas Booster Motor
6. Spare
7. Spare cabinet
8. Station electric equipment transformer
9. Main building working PC section A power incoming
10. Sectional Switch
11. Water Treatment MCC feeder and Main building working MCC feeder
12. Siemens working MCC feeder (1) and Water supply MCC feeder (1)
13. Emergency Power System EMCC feeder (1)
14. a) SST thermostat power
b) UPS bypass power
c) Air Compressor (1)
d) Control cabinet of motor firefighting pump power (1)
For 6.6 KV bus B section
1. 6.6 KV section B power incoming,
2. 6.6 KV bus section B Potential Transformer
3. No.2 Station Service Transformer
4. SFC isolated Transformer
5. No.2 Natural Gas Booster Motor
6. Fuel oil injection pump
7. Spare cabinet
8. Spare cabinet-2
9. Main building working PC section B power incoming
10. Standby and Output plant power incoming
11. Water Treatment MCC feeder (2) and Main building working MCC feeder (2)
12. Emergency power System EMCC feeder (2) and Water supply MCC feeder (2)
13. a) MPB crane
b) UPS bypass power
c) Air Compressor (2)
d) Control cabinet of motor firefighting pump power (2)
e) DM water electric heater
14. a) Electrical inspection moorail
b) Crane of generator bearing
c) Electrical inspection crane of generator magnetizing exciter
d) SST thermostat power (2)
Breaker room single line representation:
Generator 15.75 KV 15.75KV/230 KV
Grid
UAT 15.75 KV /6.6 KV
6.6 KV Bus B incoming
6.6 KV Bus A incoming
6.6/.4 KV Pump
M
M B bus PT SFC isolated Gas Booster Fuel oil injection
SST 2
1 transformer motor 2 Pump
A bus PT SST 1 Excitation Gas Booster
transformer motor 1
415V/240 V bus 415V/240 V bus
1 2 3 4 5 6 7 8 9 10 11 12
Legends:
Under 6.6 KV Bus A’s 415/240 V load operation
1. Main Building working PC (power control) section A power incoming
2. Sectional Switch
3. Water Treatment MCC feeder (1) and main building working MCC feeder(1)
4. Siemens working MCC feeder(1) & Water supply MCC feeder (1)
5. Emergency Power System EMCC feeder (1)
6. SST thermostat power, UPS bypass power, air compressor (1),Control cabinet for
firefighting motor pump power (1)
Under 6.6 KV Bus B’s 415/240 V load operation
7. Main Building working PC (power control) section B power incoming
8. Output plant power incoming
9. Water Treatment MCC feeder (2) and main building working MCC feeder(2)
10. Emergency Power System EMCC feeder (2) & Water supply MCC feeder (2)
11. DM water electric heater MPB Crane , Control cabinet for firefighting motor pump
power (2), UPS bypass power & air compressor (2)
12. Electrical inspection moorail, Crane of generator bearing, Electrical inspection crane of
generator magnetizing exciter, SST thermostat power (2)
EDG:
Emergency Diesel Generator is an important tool in the case of insurgency of a power station. In
Sirajganj 150 MW power station EDG operates Emergency Motor Control Center. EDG operates
normally important loads as 220 V battery charger and lift oil pump(50.6 KW) via 11BME52
cabinet and Fan motor (13 KW), Lube oil pump vapor exhaust (2.2 KW), GT PCC AC power
supply and two lube oil pumps (22.8 KW) via 11MBE51. The EDG is run locally from EDG run
cabinet. It has two cells battery rated 12volt 29 plates and terminal voltage is found 27Volt
Section A 415/240 v bus Section B 415/240 v bus
GTG Emergency 415/240 V
MCC
EDG
