What happens if a three phase induction motor is suddenly
single-phased while running? Which type of winding
connection will be affected?
Answer Posted / shriprasad
If single-phasing occurs when a motor is rotating, the torque produced by the remaining two positively rotating fields continues to rotate the motor and develop the torque demanded by the load. The negatively rotating field, the field associated with the lost phase, produces currents in inductive loads resulting in voltages in the faulted leg of the three-phase supply. These voltages may be nearly equal to the phase voltage that was lost.
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