Check List (Light-Up)

Unit:

Date:

Switchyard Breaker arrangement: Rihand

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  ß13-52(Bus-coupler-1) à Bus-3

Bus-2  ß14-52(Bus-coupler-2) à Bus-4

Turbine Governing system

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

Important Procedures

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

Hydrogen Purging

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

Cold start-up

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/ Cm² 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

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

Main Equipments Tripped

Instrument Air supply Failure

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

DG Load Trial and Regular checks

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

Furnace Air Tightness Test

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

Emergency Instructions:220 V DC Failure

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

Start-Up After 8 Hours of Shutdown ( Hot start-UP)

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

Tripping on Boiler Tube Leakage

Mill reject system

CERC Norms 2019 Vs 2014 : Changes

TDBFP Rolling

Beautiful Power Plant View from Top of Boiler at Night

Sample Cooler

Starting and Load Limiting Device

Unit Start Up Procedure 500 MW

Turbine and TDBFP Overspeed & Oil Injection Test Procedure

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)
  

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Citizenship Amendment Bill 2019

What is Turbine Overspeed Test ? 500 MW

Basics of Power plant | Introduction