Answer Posted / yogesh k. patil.

During underload or FSNL operation, Exhaust steam temperature increases as less heat is converted into electrical energy.Underload operation of steam turbine,like 0.9MW for a 20MW turbine is allowed for 1hrs by manufactures like seimens for SST300 turbine.But in case of emergency wher exhaust hood cooling is impelmented, that can be extended.

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