Answer / nor

one of the protection relayes in generatores that dependes
on reactanse of transe and generatores

Answer / manohar

when angular displacement of the rotor exceeds the stability
limit then rotor slips a pole pitch or we can say rotor flux
slips with respec to rotor flux. this is called pole
slipping .This relay is or protection used in generators. It
needs long explanation please refer the books

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