Energy Tab

Unit: Date:

Stage-I GT#1  à 1-52   Main (GCB to Bus Bar-1) à 2-52 (Tie-GCB to bus Bar-2) à 3-52(IBT-1 i/c) GT#2 à 7-52Main (GCB to Bus Bar-2) à 8-52((Tie-GCB to bus Bar-1) Bus bar-1 à 4-52 (H1) à 5-52(Tie H1-S2) à 6-52(S2) à Bus Bar-2 Bus bar-2 à 10-52 (S1) à 11-52(Tie S1-H2) à 12-52(H2) à Bus Bar-1 Bus-1   ß 13-52(Bus-coupler-1) à Bus-3 Bus-2   ß 14-52(Bus-coupler-2) à Bus-4

Key Points Ø   Governing- Regulation of Turbine Speed under No Load and Varying Load Ø   Others Works: CV Actuation/ Initial Run-up & Synchronization/ Load Variation to meet Grid Freq Ø   500 MW KWU: Throttle Governed Machine Ø   2 Governors , EHC and HG connected in Parallel: Only One at a time through Hyd Minimum slection Ø   CVs Open according to Secondary oil Pressure Ø   Between 100 MW   to 525 MW , Load variation done by HPCV throttling

Vacuum Pulling : Procedure: Ø   Close RH Vents, CRH, HRH UFT drains Ø   Close Vacuum Breaker Ø   Open 8.5 m steam Manual valve full Both (100%), Temp> 250 Deg ( Open Ø   Start GSC Exhauster Fan Ø   Start Both Vacuum pumps ( Casing Empty, Receiver tank Level adeq) Ø   At -0.2 ksc charge steam gradually ( lower Controller from 50% à 0 %) Ø   Build Vacuum upto -0.9 ksc

Ø   SLC AS SOP Off, SLC DC SOP Off, SLC H2 SOP Off Ø   Suppy of DC SOP Off Ø   Start one AC SOP ( DP=1.5 ksc) Ø   Dew Point Air=<-10 Deg, clearance from Chemist Ø   H2 (Isolated Position), CO2(Isolated Position), Air Inlet(Open), Casing vent ( Closed) Ø   Fill and Pressurise upto 0.5 ksc

Points to Remember Ø   maximum of HP casing and HP shaft is less than 150 ° C(more than 5 days) Ø   It requires soaking of Turbine at 360 rpm with steam(40ksc,360 Deg) Ø   An upper limit of 200 ° C/hr. saturation temp gradients can be allowed , i.e. approximately the boiler pressure can be brought to 20 Kg/ Cm 2 within an hour of cold start up Ø   But actual temp gradient is limited by the thick walled Y piece provided in the main steam and HRH lines Ø   maximum differential temp allowed between inner (98%) and mid wall temp (50%) is ±40 ° C Ø   Start only two CC pumps in order to minimize flashing in down comers (and subsequent vibration) when the boiler water is in the range of 85 ° to 125 ° C

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

Reasons of   Failure: Ø   Failure of control supply of   compressor Ø   Loss of Cooling Water (SG ECW Pump Trip) Ø   Massive leakage in   IA supply Header Ø   One Unit Under Overhaul. Unit Aux Board/ Station Aux board   got Tripped of that Unit Ø   Total Black Out of any stage

Requirements: 1 Inform & Ensure availability of TMD/EMD/C&I 2 SG/TG/BOP source-2 AC Power Supply Interruption. Inform C&I for Standby chargers 3 Ensure DG Set Tank Oil Level Adequate 4 Evacuate and Isolate Boiler Passenger, Service Building Lift and Isolate. Inform EMD(temporary supply ) 5 Arrange 3 Walky Talky : 1-CR 2-DG board 3-DG Set room 6 Note Down Initial Parameters of DG Set

Ø   Scope - Boiler Furnace, Air and FG Duct upto ID Fan Inlet Ø   Why - To test Tightness of Furnace wrt Environment not for Strength Ø   Ensure- All PTWs of BMD( PP, Rotary, Mills, Ash handling) cancelled and Clearance Available

220 V DC Failure Unit condition Ø   DCDB section-1 & 2 under voltage alarm in LVS-5 Ø   All HT/LT Breakers Indication Becomes Bad Ø   Boiler will Trip on MFT ( after 2 Sec) Ø   Turbine will Trip on MFT Ø   Generator will not Trip as GCB Protection will not act Ø   Generator will run as Synchronous Motor

Unit condition 1 At least 2 BCW pump in Serrvice 2 Both SAPH and PAPH Running 3 Turbine : On Barring (AOP,JOP,SOP, HPCF   in service) 4 Generator: PW system, Seal Oil system, Gas system 5 Condenser Pass : Both Charged 6 PAC & IAC : 1 PAC & 2 IAC in Service 7 CEP & Make-up :   1 CEP with H/W Make-up on auto

Oil Injection of Main Turbine: Press Test Valve Turn Test Hand-wheel Anticlockwise slowly ( to develop Test Oil) Note Turbine Speed, Test Oil Pressure, Primary Oil Pressure when Bolts Operate(Aux Trip Oil becomes 0) Turn Test Hand-wheel Clockwise slowly (Test Oil pressure becomes 0)