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What happen if 1200KW/1500KVA alternator runs at no load
and high R.P.M.for one minute?
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Answer Posted / k.prakashchandra
There are over speed and over voltage relays to
protect.Governor becomes helpless if there is sudden throw
off of load,then over speed relay of the governor shuts down
the prime mover.With AVR, voltage does not increase.However
generators are designed to withstand runaway speeds for
short periods. Bearings are first to get damaged under
prolonged high speeds.Governors can also be made not to
allow for undesired high speeds with the help of braking
systems, if they are employed.
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