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4 August 2011 PMI Revision 01 1 GENERATOR AUXILIARY SYSTEM

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GENERATOR AUXILIARY SYSTEM4 August 2011 PMI Revision 01 1

Generator Auxiliary System GENERATOR AUXILIARIES CAN BE BROADLY DIVIDED INTO THREE SYSTEMS A) Stator water system B) Seal oil system C) Gas system

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STATOR WATER SYSTEMEXPANSION TANK GAS TRAP FLOW METERS DIFF PRESS SWITCH

MAGNET FILTERFSI I

FILTERS

DIFF PRESS. CONDUCTIVITY MAKE UP

POLISH UNIT

COOLERSPUMPS VACUUM PUMPS4 August 2011 PMI Revision 01 3

Stator Water System Stator water cooling is a closed loop system There are two full capacity single stage centrifugal pumps with change over facility The pumps are driven by 3Ph. 415V A.C. motors The stator water cooler is shell and tube type heat exchanger DM water flows through shell

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Stator Water System There are two mechanical filters and one magnetic filters Mechanical filters are of wire mesh type Magnetic filter is having permanent magnet The expansion tank is a hermetically sealed container made of S.S.

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Stator Water System Float valve is there in the expansion tank to maintain water level in the tank which act as suction storage tank for stator water pumps Polishing unit (mixed bed ion exchanger) is there to maintain conductivity of stator water to desired level

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Stator Water System For commissioning the system the system has to be filled up first Prerequisites for filling the cooling circuits a) circuit should be flushed b) hydraulic testing c) installation of pump and motors after O/H d) filters cleaned and boxed up

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Stator Water Systeme) coolers and all other components are boxed up f) ion exchanger is ready and is in service g) all instruments and measuring devices are in position after their callibration

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Stator Water System System should be lined up for filling Complete stator water system should be filled with DM water having required quality All air should be vented from the system before starting of the pump

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Stator Water System Take trial of the water pumps Check the stand by pump for automatic starting Adjust level regulator in the expansion tank Check all the signalling devices for proper functioning

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Stator Water System Check all the instruments and meters for their proper functioning Adjust make up water pressure around 2.0Kg/cm2 Adjust small water flow through the gas trap Check there is no leakage of water in the system Take ejector into service Take one cooler into service

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Stator Water System Check emergency switching in circuit of the stand by water pump Check high and low alarm of the expansion tank Check high conductivity alarm and tripping Check pump discharge pr., filter diff. pr., conductivity, flow, inlet winding pr., winding diff. pr., vacuum in expansion tank, motors current

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SEAL OIL SYSTEMEE BEARING TE BEARING

FLOW M.FROM GAS SYSTEM GAS EXHAUST

PS PGTS ES

TGSOSTBEARG DRAINS

FR

DPRV

IOT

DP SWVACCUM PUMP

VACUUM TANK SOP 1

FILTERS2

SOP-3 DC OIL COOLER

CONSTANT PRESS. REGULATORS WITH ORFICE PLATES4 August 2011 PMI Revision 01 13

SEAL OIL SYSTEM Generator shaft seals are supplied with pressuerised seal oil to prevent hydrogen escape at the shaft Maintains continuous oil film between Seal Ring and rotor journal Oil pressure is kept higher than the gas pressure There are one AC seal oil pp. and one DC seal oil pp. which feed oil to the seal through cooler and filter4 August 2011 PMI Revision 01 14

SEAL OIL SYSTEM Both the seal oil pumps are 100% capacity screw type pump A vacuum pump is provided to maintain vacuum in seal oil tank There is a additional facility to supply seal oil from governing oil The seal oil pressure to the seal is controlled by DPR which maintain specified DP between oil and hydrogen

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SEAL OIL SYSTEM Thrust oil is there to hold the seal ring in position against gas pressure Two seal oil coolers having 100% capacity is provided to cool the oil Duplex filter is provided in the oil line Vacuum pump evacuates gases from SOT

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SEAL OIL SYSTEM Commissioning of seal oil system will be required when the 1) generator to be filled with hydrogen or air. 2) machine to be put on barring gear Prior to commissioning make sure that all instruments and devices are ready for operation after callibration, overhauling and trial.

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SEAL OIL SYSTEM Seal oil system has to be filled with oil Prerequisite for oil filling 1) set all level switches 2) close all stop and non-return shut off valves 3) open all pressure gauge and pressure switches isolating valves

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SEAL OIL SYSTEM4) open pressure transducer isolating valves 5) open isolating valves of impulse lines of differential pressure regulator 6) bearing lube oil system is in service

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SEAL OIL SYSTEM Open isolating valve of seal oil storage tank to seal oil system. Oil will start filling the seal oil system Open valves in oil flow path Take coolers and filters into service After oil is filled up into the system level will be visible in the gauge glass of the SOT

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SEAL OIL SYSTEM Take governing oil system into service Start AC seal oil pump To clear air locking seal oil pump should be switched on and off till its discharge pressure gauges shows a constant pressure Vent DPRV-A and DPRV-B

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SEAL OIL SYSTEM Vent both the coolers one by one Vent filters Vent pressure gauges, pressure switches and transmitters Set seal oil pressure by DPRV-A Stop AC seal oil pump and set DPRV-B (