Problem Statement: Electrical Engineering Professional SubjectsElectrical Machines: AC Motors Problem Solving
An induction motor of 30-hp, 220-volts, 3-phase draws 450 percent of the rated current with the rated voltage and delivers during the starting period 130 percent of the rated torque. The fullload efficiency and full-load power factor of this motor is 80% and 70% respectively. If an autotransformer is used as a starting unit and starting torque of the load is only 50 percent of the rated torque of the motor, find the starting voltage.
A. 136.44 volts
B. 130.65 volts
C. 132.36 volts
D. 134.20 volts
The starting voltage is equal to 136.44 Volts.
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