IBT Outage



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
§  OSA(SW MCC), OTB(Serv Bldg Ventilation MCC), FOPH : 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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