Consequences on Stage-2 ( Station
Transformer Tripped)
Ø 132
KV Switchyard dead results in tripping of -Station Transformers, Construction
Transformer, Misc Transformer
Ø All
colony power( Lighting,Water supply) will get interrupted
Ø Power
Supply to DM Plant, HFO Pump house, PTCW Pump house, Offsite Board, ADPH,
Ø Following
Board will get dead:
§ OBA,OBB,OBC,OBD
(11 KV station Board)
§ OCA,OCB
(3.3 KV Station aux Board), ADPH MCC, CHP Transformers
§ DMPT,
CWST, WTPT,BTST,ODA,ODB(Station Service), ODC(FW Pump House),ODD ( Offsite ):
3.3 KV
§ OQA,OQB(St.
Serv),3SA,4SA(Air Washer MCC),3TA,4TA(Unit Ventilation MCC),OTA(HVAC ) : 415 V
Ø Following
Equipments will Trip
( If running)
§ MDBFP
§ ECW
pump (TG)-C, PAC-1, PAC-2, IAC-3
§ DM
Make-up Pumps, Boiler Fill Pumps, CW BFV OSU, MOT Centrifuge,
§ Electric
Hydrant/Spray Pumps, Service Water Pumps, APH Wash Pump, Ash Water Make-up
Pumps,
§ HFO/LDO
Pumps , Raw Water Pumps, HVAC Make-up Pumps,
§ Clarified
Water Pumps, SW Tank Make-up Valve
§ Unit-3:
ACW pumps-B,C | Unit-4 : ACW Pumps-A,C
§ HVAC
Equipments ( Air Washers, Chilled Pump, Condensate Pump etc)
§
Ø Actions:
§ Charge
IBT asap after informing EMD, if cannot be revived go For Safe Shut own Or
otherwise follow
§ Stage-3
IAC Interconnection : Open
§ Stop
soot Blowing
§ ACW-3A
and ACW-4B will keep on running, Start 4th CW pump if not running
§ Observe
Hotwell level, if decreasing Reduce load
§ Close
PRDS Supply from Unit to reduce water consumption
§ If
IBT cannot be revived, Before Tripping Unit, Start DG Set, Start AOP-1, SOP-1,
PW-1 and then close DG incomer braeker of DG board and shift essential drives on this bus after
tripping normal incomer from unit
§ As
IBT revives, Charge ST, SATs, SSTs and run drives essential for normal
condition of unit
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