ATT-200 MW


 

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HP & LP Bypass Operation and Protection

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HP & LP Bypass Operation and Protection Purpose Boiler operation independent of the turbine Minimum steam flow through SH & RH tubes during start-ups, low load operation & sudden unloading of unit Utilized or building up of steam parameters Avoiding the boiler trip on Reheat protection No steam flow through Boiler steam tubes will lead to starvation & thereby overheating and lead to premature failure of tubes  The capacity of HPLP bypass is 60% of full load turbine steam flow  Reheat Protection: RH protection (delay=10 sec) will act if TURBINE HP V/V & HPBP CLOSED [ either turbine HP stop v/v or HP CV in both HP line closed ] & [ both HP BP <2%]             OR TURBINE IP V/V & LP BP closed [ Either IP stop v/v or IP CV v/v in both IP line closed ] & [ Either LP BP stop v/v or LP BP C/V in both LP line is closed] OR   Generator ckt bkr open & [both HP BP closed OR both L...
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Generator Air Tightness Test

Generator Air Tightness Test Period Of Test= 24 Hrs without a Break Air Pressure Drop (Allowed in 24 Hrs) : <=0.15 ksc Air Test Pressure = 3.5 ksc All LLDs Drain Closed. Ensure Seal Oil system in Operation Seal Oil DP >1.5 ksc AS Seal Oil Pr>4.5 ksc, start H2S Seal Oil system H2 Cooler Isolated PW in Winding is in filled condition, Winding Isolated. PW also kept Isolated. PW Tank at Atmospheric Pressure Ensure availability of  Instrument air and Bleed Out moisture from it by keeping it open till  Connect flexible air hose with the gas plant through the coupling and ensure no air leakage is there  The filling is to be done by opening the valves in the normal H2 filling line where as the valve from H2 rack side will remain closed. Once the air filling is commenced the test record data sheet   The air valve is to be opened full. While pressurising the LLD / Seal oil DP / Seal oil parameters are to be recorded as per the enclosed sheet. The...
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