Generator Protection - ERPC

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Copyright @ Power Research & Development Consultants Pvt. LtdGenerator Protection1Copyright @ Power Research & Development Consultants Pvt. Ltd2Generator 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. Ltd3Aspects 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.

Stator temperature (thermal) protection Resistance temperature detector (RTD) embedded in the stator slot is used for temperature measurement. Relay provides a constant current source to measure the voltage across the RTD. It is possible to have two settings, one for alarm and the other for tripping.

  Resistance, Temperatures, Detectors, Resistance temperature detectors