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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 / madhusudhana
A three phase motor will continue running if a phase is
lost. Most three phase overload relays are not intended to
provide true single phase protection, so the most likely
scenario is the motor will run at reduced speed for some
time and will eventually overheat and fail. A three phase
motor will not start, on its own, with only single phase.
However, if the motor shaft is "manually" spun it may begin
to turn and accelerate slightly. If the motor shaft is
turned backwards then the motor would start in reverse.
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