Answer Posted / abubakr

when excitation is lost due to fault or field breaker
tripping . Reactive power will be supplied by the system and
generator will work as induction generator and its speed
will rise a little . generator which was in over excitation
mode will work in underexcitation .
but there is under excitation limit which should not be
reached so we should detect loss of excitation and trip
generator

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State angle criterion.

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The power supplied to a 50mH inductor from a 120V, 60Hz source will be

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along with technical test papers

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