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11 KV Station Board: OBC ( Station Board) Tie to 4BA (Unit Board) Tie to OBA (Station Board Unit-3) ADPH-2 Transformer Drives- MDBFP-4C OBD Tie to 4BB(Unit Board) CHP-2 Transformer HT to station auxiliary board OCB Tie to OBB (Station Board Unit-3) 4BA HT to unit auxiliary board 4CA-1 Tie to OBC CEP-4A, 4C PA fan -4A, FD Fan -4A ID fan -4A Ch-1 & Ch-2 CW pump-4A 4BB HT to unit auxiliary board 4CA-2 Tie to OBD CEP-4B PA fan -4B FD Fan -4B ID fan -4B Ch-1 & Ch-2 CW pump-4B 3.3 KV Boards OCB(Station Auxiliary Board) HT to Station Service Board ODB(unit-4) HT to BTST-2 HT to DMPT-2 HT to WTPT-2 HT to CWST-2 HT to Station Service Board ODB (unit-3) HT to ODCT02 HT to ODCT02 Tie to OCA 4CA-I (Unit Auxiliary Board) HT to CTST-4A HT to Unit Service Transformer 4DA HT to ESP field Transformer A1 , B1 , C1 , D1 DRIVES-   ECW pump (TG)-4A,  ECW pump-4A(SG),  BCW pump-4A,   Mill-4A,4C,4E,4G...

INTRODUCTION: - The ash water system is used to cater water for various utilities in ash handling  system. The water is supplied from the ash water tank through the pumps like BALP pumps /  BAHP pumps / FW pump / sump jetting water pumps which are located at Ash Water Pump  House and are started & stopped from ASPH control room . Ash water tank makeup make is  taken from different sources like Raw water makeup from stage 1 & 2 inter connection, Raw water makeup from stage-2, Ash water recirculation, Treated ash water recirculation, Service  water blow do wn a nd CHP according to the situation and requirement. Low pressure ash water system caters water at the following areas (BALP pumps): Ash slurry sump makeup. Ring header for seal trough makeup / flushing. Refractory cooling supply. Bottom ash hopper makeup / filling. Bottom ash hopper window spray. Make up to overflow settling bin. High pressure water pump caters water at the following...

INTRODUCTION : - Various spaces in stage -II main power house building are air-conditioned by one number  centralized chilled water type air-conditioning plant consist of 2 nos 300TR capacity vapor absorption   machine (VAM) for normal service and 2 nos of 300TR ‘screw chilling’ units for backup standby. The  inside conditions of the control rooms are maintained with room temperature 24.4°C ±1°C and RH 50% ± 5% for all spaces except programmer room for which temperature maintained 22°C ±1°C and RH at 50% ± 5% . The VAM and screw chillers are having in built capacity control management which is  operated through microprocessors interface with main PL C control panel. Normally main plant A/C system will be in operation continuously as it is covering cooling areas  related to all unit # 3, 4, 5 and 6 CER & CCR. Whenever maintenance is required on screw chiller unit # 1 / 2, the availability of VAM to be ensured and will be kept in operation. ...

  INTRODUCTION :  In coal fired boilers ash is collected in two forms, bottom ash and fly ash. BA constitutes around  20% o f the total ash and remaining  80%  is collected in the form of  fly ash . Fly ash evacuation is done online using  vacuum pumps  either in  dry ash mode  or in  wet mode . In wet mode  we use  collecting towers  which  sprays water on ash  going  to vacuum pump suction and makes it  slurry  which will be  discharged  in to  seal box  and then  to slurry trench . In  dry mode we collect dry ash in  buffer hoppers  there by with the help of  transport air  it will be carried to hoppers  in the  ash dyke  and from there it is  stored and distributed  to different users.   ISOLATION PROCEDURE FOR FLY ASH SYSTEM : SHUT DOWN CHECKS: Before shut down of fly ash system, ensure all hoppers a...

Prestart checks and starting of lube oil system: 1 Check the lube tank level is normal (>50% in upper gauge glass, Two gauge glasses are provided). 2 Check the lub oil system is properly lined up (one cooler & one filter). 3 Check all the instruments are fixed and the root valves are open. 4 Check the lub oil coolers are charged from SGECW side. 5 EPB’s of LOP are released. 6 Check recirculation valve is crack open. 7 Give clearance to UCB to start one lub oil pump. 8 After the LOP is started from UCB, feel the oil flow in recirculation line and close recirculation valve after two minutes of pump starting. 9 Check the return oil flow from bearings and check the oil pressures. The Normal control oil pressure after the cooler & filter is > 10.00 Ksc & Lub Oil pressure is 2ksc. 10 Check for any oil leakage from inside the fan casing. 11 If control oil pressure is < 9.5 ksc, BMD to be informed to adjust relief valve setting. 12 Check for any abnormal sound from the p...

PRE CONDITION OF THE UNIT:    1. Unit is running at full load (500MW) with 7 mills in operation. 2. Both TDBFPs are in service and Feed water control in auto. 3. MDBFP # C is available on auto (Rapid start up mode). 4. Airflow control is in auto with both FD fans in service. 5. Both PA fans in service in CAS mode. 6. Unit control is in CMC mode. 7. Both ID fans in service and furnace draft control in auto. ENSURE THE FOLLOWING:    1. Revise the station DC as per the planned shut down programme. 2. Bypass FD fan discharge gate close permissive from remote when fan in running condition to trip the fan on fan running and discharge gate close protection. 3. FD fan trip from ID fan trip and ID fan trip from FD fan trip protections are to be bypassed. 4. Ensure the running contact of other set ID fan & FD fan . 5. Availability of atomizing steam and HFO at requisite pressure & temp (oil: 100 º C / 17-18 kg/cm², Steam: 200 – 210 º C / 6.5 kg/cm²). 6. Completio...

Steps to do Over-speed Test for Main turbine   Open the Top cover of pilot valves KA02 and KA03 of MAX62AA001 . Press the pilot valve KA02 fully and observe the Aux. start-up fluid pressure. lf pressure is ok slowly release the valve. Press the pilot valve KA03 fully, to isolate the Auxiliary trip fluid from main trip valve to over-speed trip test device and keep in pressed down till the completion of the test. Note down the Aux Trip Fluid Pressure Rotate the hand wheel KA01 of over-speed trip test device in clockwise direction for admitting the test fluid to the over speed Bolts . The actuation of over speed bolt is indicated on the test rack by lamps for limit switches MAY10CG001 and MAY10CG002 , provided on the LHS of front bearing pedestal. Alarm in control room is to be ensured. Check whether Auxiliary trip fluid pressure goes to zero . Note down t he t est fluid pressure when over speed bolts acted and ensure alarm in UCB. Rotate the ...

CEP START PERMISSIVE   1.       CEP Suction valve open   AND             Hotwell level not low (>-250 mm)   2/3   AND                                    Swgr. available   AND             Swgr. not disturbed   AND             Thrust bearing temp   < 100 degc   AND                      Motor bearing temp. < 85 degc    AND             Motor winding temp.   < 125 degc   AND   ...