1.

Write the steps of starting of 3 phase induction motor.

Answer»

The three phase induction motor may be started by connecting the motor directly to the full voltage of the supply. The motor can also be started by applying a reduced voltage to the motor when the motor is started.

The torque of the induction motor is proportional to the square of the applied voltage. Thus, a greater torque is exerted by a motor when it is started on full voltage than when it is started on the reduced voltage.

The three methods to start the 3 phase induction motor are:

  • Direct on line 
  • Star delta starter 
  • Autotransformer starter


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