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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 / raj mohan singh
The following are the
effects of single
phasing:
1) Due to single phasing
the current in
the remaining two phases
increases
and it is approximately
2.4 times the
normal current value.
2) Single Phasing reduces
the speed of
the motor.
3) The motor becomes noisy
and
starts vibrating due to
uneven torque
produced in the motor.
4) If the motor is arranged
for
standby and automatic
starting then
the motor will not start,
and if the
overload relay provided
fails to
function then the motor may
burn.
5) The windings will melt
due to
overheating and can give a
fatal shock
to the personnel.
6) It may cause overloading
of the
generator.
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