Aux Power
Distribution
Lakshitha Mahagedara.
Electrical Engineer.
220/20kV to 6kV Distribution
– Phase II 6kV single line diagram
– Main Electrical connection in DCS console (Unit 2)
– 6kV distribution in DCS console
– Fast Bus transfer window
– Fast Bus transfer device
– Unit 2 6kV room
– 6kV power incoming(UAT, SST2,SST1,Interconnection)
Interconnection of SST 2 to Phase I
6kV Distribution (unit 2)
– Bus A – Bus B
– To unit 1(10BBA) – To unit 1(10BBB)
– Power incoming (UAT) – Power incoming (UAT)
– SST 1 – SST 1
– SST2 – SST2
– Bus PT – Bus PT
– CWP 2A – CWP 2B
– BFP 2A – BFP 2B
– BFP 2C – BFP 2C
– Condensate pump 2A – Condensate pump 2B
– FDF 2A – FDF 2B
– IDF 2A – IDF 2B
6kV Distribution (unit 2 Cont’d)
– Bus A – Bus B
– PAF 2A – PAF 2B
– UTST 2A – UTST 2B
– UBST 2A – UBST 2B
– ESP 2A – ESP 2B
– CST C – CHWT C
– CHWT A( Prv. from unit 1) – CWT A ( Prv. from unit 1)
– CH & FGD UNIT 2 – CH & FGD UNIT 2
– CST A ( Prv. from unit 1)
– SL &PT C
– SL & PT A ( Prv. from unit 1)
– OCCW PUMP 2A – OCCW PUMP 2B
6kV Distribution (unit 2 Cont’d)
– Bus A – Bus B
– CCCW PUMP 2A – CCCW PUMP 2B
– COAL MILL 2A – COAL MILL 2C
– COAL MILL 2B – COAL MILL 2D
– COAL MILL 2E
– #2A BELT CONVEYER (Prev. unit 1)
CH & FGD (Unit 2)
– Bus A (Bus coupler is available) – Bus B (Bus coupler is available)
– Power incoming – Power incoming
– Bus PT – Bus PT
– CHT A – Aeration fan 2B
– Booster fan 2 – Aeration fan 2C
– Aeration fan 2A – SS 1
– Absorber pump 2A – Absorber pump 2C
– Absorber Pump 2B – GGH seal air fan
– Coal crusher A – Stacker reclaimer #2
– #7 belt conveyer – Chlorination plant D
– Chlorination plant C – JOPT A
SS 1
– Bus A (Bus coupler is available) – Bus B (Bus coupler is available)
– Power incoming 1 – Power incoming 2
– Ship unloader #1 – Ship unloader #2
– Port T/F A – Port T/F B
– SS 2 – SS 2
– Reactive load compensation – Reactive load compensation
– Ship unloader #3 – Ship unloader #4
Main 400V Transformers
– Unit Boiler Service Transformer (UBST)
– Unit Turbine Service Transformer (UTST)
– Electro Static Precipitator Transformer (ESPT)
– Small Lighting and Power Transformer (SL & PT)
– Common Service Transformer (CST)
– Chemical Water Transformer (CHWT)
– Cooling Water Transformer (CWT)
– Coal Handling Transformer (CHT)
– (JOPT)
– SS1 Port Transformers
– SS2
– Unloaders/Stacker & Reclaimer
Unit Boiler Service Transformer(PDC)
UBST-A UBST-B
Boiler
Emergency Sealing Emergency M&V
Sealing air UBS MCC UBS MCC UBS UBS MCC
service PC
2C 2A
air Fan service PC Power
Fan 2A 2A 2B MCC 2B 2C
distributio
2B
n panel
• 1000kVA, 0m Level main control building
Unit Turbine Service Transformer
UTST-A UTST-B
Turbine #2
M&V Turbine Vacuum #2 Seal Condensa
UTS UTS UTS UTS te Vacuum
Distribut Oil tank Pump oil Transfer
ion MCC 2A MCC 2C Purifier
MCC 2B MCC 2C Pump 2B
Electric 2A pump
Panel heater
• 1000kVA, 0m Level of Turbine House
Turbine/Boiler Service Transformers in DCS Console
Electro Static Precipitator Transformer
ESPT-A ESPT-B
#2
#2 Aeration Aeration
and Air Bus and FGD Bus
Absorber Absorber Ash silo
Absorber compres. Junction Absorber
MCC 2B
Emergency junction
pump house MCC 2A pump MCC 2A MCC
MCC 2A Cabinet cabinet
MCC 2A house
MCC 2B
• 2500kVA, ESP & FGD control room
Small Lighting & Power Transformer
SL & PT -A
#2 NLDB
for unit 2 NLDB NLDB NLDB for NLDB for 400V No 1 No 5 NLDB Turbine Emergen
turbine turbine turbine IDF house debris SWGR NLDB #2 NLDB #2 Boiler overhead Light
house 0m 6.3m #2 filter house #2 Boiler Boiler house 0m Crane MCC
37.5 m
• 500kVA, ESP & FGD control room
Small Lighting & Power Transformer
SL & PT -B
#2 NLDB #2 NLDB #2 NLDB
for for for No 1 #3
NLDB for 400V No 1 NLDB #2 No 5 No 2 No 1
Central Central Central NLDB Emerg
#3 SWGR NLDB IDF NLDB #3 NLDB #3 NLDB #3
control control control unit light
turbine 37.5m Boiler house Boiler Boiler Boiler
Building Building Building turbine MCC 0m
19m 12.6m 0m
• 500kVA, ESP & FGD control room
Common Service Transformer
CST -A
#2
Condensin Gas Condensin Maintenan
Central Instrument
g water firefighting Air Unit water g water GIS Relay Coal ce and
Control Conveyer air
regenerate CO2 Conditione Basin MCC regenerate room MCC Bunker Chiller A ventilation
building 1A compresso
MCC A handling rA A MCC A B MCC A boiler
MCC A rA
(U2) MCC A (U3) house
MCC
• 2000kVA, 5.8m Level
Common Service Transformer
CST-B
Conde Gas Conde
nsing firefigh Central nsing Conde Ash Ash #3
Unit Service Service
water ting Air control water Coal nsing handli handli M&V
water Chiller Convey air air
regene CO2 Conditi buildin regene bunker water ng air ng air boiler/
basin B er 1B comp. comp.
rate handli oner B g MCC rate MCC B heater comp. comp. turbin
MCC B C D
MCC B ng B MCC B box B C e MCC
(U2) MCC B (U3)
• 2000kVA, 5.8m Level
Chemical Water Transformer
CHWT-C
Makeup Cooling
CCCW Travelling
RO2 HP water water Desalinati Desalinati
Local Chlorinati RO1 HP screen Roots RO1 HP
pump treatment pump on Plant on Plant
control on MCC pump 4 washing Blower #1 pump 7
2/5/4/7 building house MCC A MCC D
box pump A
MCC A MCC A
• 2500kVA, Near RO1
Chemical Water Transformer
CHWT-D
Makeup
Travelling
water CW pump Desalinatio Desalinatio
RO2 HP RO2 HP #3 CCCW RO1 HP screen Roots
treatmet house MCC n Plant n Plant
pump 6 pump 4 control box pump 6 washing Blower #2
building B MCC B MCC C
pump B
MCC B
• 2500kVA, Near RO1
Cooling Water Transformer
CWT-A (Phase I)
Washing Service Industrial Control
CW water Fuel oil
LDO pump A water waste cabinet of
pump Workshop pump Aux boiler Fire pump Chlorination
transfer for pump water backwash MCC A
house MCC A house MCC A A
pump A travelling house treatment water
MCC A MCC A
screen MCC A MCC A pump
• 1600kVA, service and fire water pump house building
Cooling Water Transformer
CWT-B (Phase I)
Control
Washing Service Industrial
CW water Fuel oil cabinet of
LDO pump B LDO water waste
pump Workshop pump Aux boiler Fire pump reuse
transfer for transfer pump water
house MCC B house MCC B B (Clear)
pump B travelling pump C house treatment
MCC B MCC B water
screen MCC B MCC B
pump
• 1600kVA, service and fire water pump house building
Emergency Service PC
ES-PC-A (Unit 2)
Main
block
Incomin
UBS UBS Main Main DC Jacking Main
g UTS Turbine Boiler Emerg.
Emerg. Emerg. Block block Emerg. power oil block
Feeder Emerg. MOV MOV incomin
MCC MCC DC UPS Coupler (Battery pump UPS
(UBST MCC 2A power power g
2A1 2A2 power power 2 bank 2A power 3
A)
charging
)
• 5.8m level main control building
Emergency Service PC
ES-PC-B (Unit 2)
Main Main
block block
Incomin
UBS UBS DC DC Jacking Main
g UTS Emerg. FGD #1/#2 Emerg.
Emerg. Emerg. power Emerg. power oil block
Feeder Emerg. Light Emerg contract incomin
MCC MCC (DC Coupler (Battery pump UPS
(UBST MCC 2B MCC MCC ion cct g
2B2 2B1 battery bank 2B power 1
B)
Chargin charging
g) )
• 5.8m level main control building
UBS Emergency MCC
UBS Emergency MCC 2A
1. Aeration Basin lamps control board 2. FDF A oil station
3. FDF B oil station 4. APH A control box
5. Boiler Elevator 6. I & C power panel
7. Igniter control cabinet A 8. Igniter control cabinet B
9. Mill A oil station 10. Mill B oil station
11. Mill C oil station 12. Mill D oil station
13. Mill E oil station 14. IDF A Cooling fan A
15. IDF B cooling fan A
• 0m level of boiler
UBS Emergency MCC
UBS Emergency MCC 2B
1. Chimney light power 2. FDF A oil station PS 2
3. FDF B oil station PS 2 4. APH B control box
5. Central refrigeration station power cabinet A 6. Igniter control cabinet c
7. CWP house distribution cabinet 8. Flame detection cooling air fan control B
9. Mill A oil station PS 2 10. Mill B oil station PS 2
11. Mill C oil station PS 2 12. Mill D oil station PS 2
13. Mill E oil station PS 2 14. IDF A Cooling fan B
15. IDF B cooling fan B 16. Mixed bed MOV power distribution panel
• 0m level of boiler
UTS Emergency MCC
UTS Emergency MCC
1. Fire fighting valve panel for coal handling power A 2. EH oil pump B control panel
3. Turbine gear 4. Turbine lube oil tank fan A
5. AVR terminal box 6. EH oil supply device
7. HP/LP bypass station control cabinet 8. Firefighting valve panel main building power A
9. Turbine hall electric MOV 10. Turbine lube oil tank fan B
11. Generator hydrogen side seal oil pump 12. BFP A oil pump
13. BFP B oil pump 14. BFP C oil pump
15. Generator air side seal oil pump
• 0m level of turbine house
Emergency Light MCC
Emergency Light MCC
1. NO 1 ELDB 0m for turbine house 2. ELDB of 400V electric room in #2
turbine house
3. NO 1 ELDB of 0m #2 boiler block 4. #1 ELDB 37.5m turbine house
5. #1 ELDB of #2 boiler block 6. #2 ELDB of #2 boiler block
7. #3 ELDB of #2 boiler block 8. #1 ELDB of 6.3m of #2 turbine house
Power supply – SL & PT C / ES PC 2B
• 0m level of turbine house
FGD Emergency MCC
FGD Emergency MCC
1. Absorber pump area #2 control box 2. Booster fan #2 power
3. Aeration Basin #2 control power 4. GGH Auxiliary motor
Power supply – ESPT 2B / ES PC 2B
• Fluidizing blower house for ash silo
UPS Power
Power incoming –Emergency PC
DC Power
Power incoming –Emergency PC
Operations
• 400V breaker rack-in and rack out operation
• 6kV breaker rack-in, rack-out and earthing
operation
• 6kV bus incoming transfer from SST1 to SST2
• Bus coupler operation on CH & FGD
• Emergency power (DG)
