Posted: March 1st, 2017

Assume the slip at full-load to be 3.5% and short circuit current to be six times full- load current.

Calculate the ratio of transformation of an autotransformer starter for a 25 Kw, 400V, 3-phase induction motor if the starting torque is to be 75% of full-loaded torque. Assume the slip at full-load to be 3.5% and short circuit current to be six times full- load current. Ignore magnetizing current of the transformer and of the motor

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