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Generator Protection - ERPC

Copyright @ Power Research & Development Consultants Pvt. LtdGenerator Protection1 Copyright @ Power Research & Development Consultants Pvt. Ltd2 Generator Protection -Introduction Size of individual generating unit 30 MW to 500/1000 MW Loss of even a single unit is a serious problem Consequence : Protection systems of such generators have also become more stringent Required to reduce the outage period to a minimum Achieved by rapid discriminative clearance of all fault conditions associated with the units Damage due to faults is none or to the minimumCopyright @ Power Research & Development Consultants Pvt. Ltd3 Aspects of Generator ProtectionFault Classification Internal faults Abnormal Service conditions External Faults (as back up Protection ) The hazards and problems considered Phase to phase faults in winding Phase-ground faults in winding Ground faults in the rotorCopyright @ Power Research & Development Consultants Pvt.

differential Transformer (GT-UAT) differential Inter turn fault Generator rotor earth fault ... Overall Differential Protection Relay During normal conditions, a small current flows through the differential circuit of the relay. This current corresponds to the excitation current of the

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