A 30 kW, 440 V squirrel-cage induction motor has a starting torque of 182 Nm and a full-load torque of 135 Nm. The starting current of the motor is 207 A when rated voltage is applied.
Determine:
(a) the starting torque when the line voltage is reduced to 254 V.
(b) the voltage that must be applied for the motor to develop a starting torque equal to the full- load torque.
(c) the starting current in parts (a) and (b).
(d) the starting voltage to limit the starting current to 40 A, and the corresponding starting torque.