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What happens if a three phase induction motor is suddenly
single-phased while running? Which type of winding
connection will be affected?
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Answer Posted / rajesh shah
If a three phase induction motor is suddenly single-phased
while running, no distinct change will happen if it is
running under noload condition. You will just hear a
hunting sound and the the motor will continue to run with a
slightly lowered speed and increased current, but if the
motor is running under loaded condition it will stop down
and take excessive current due to single phasing and the
protection circuit will trip, if protection ckt is not
installed the motor will be ultimately burnt due to
excessive locked rotor current.
And note: This experiment is tested.
| Is This Answer Correct ? | 55 Yes | 2 No |
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