Performance analysis of fast reclosing transients in induction motors

Induction motors are used extensively in the heavy industry. For these load s, this often requires reclosing on the motor before it reaches zero speed. However, if the supply voltage is applied before the motor reaches zero sp eed, the motor can be damaged due to excessive current and torque transient s. This paper presents a performance analysis of fast reclosing transients in induction motors. It is shown that the optimum time instant for reclosin g depends upon the supply voltage and load parameters. The results indicate that the maximum absolute value of instantaneous torque occurs in the firs t cycle and for every time cycle of supply voltage. In fact, there are at l east one positive peak and one negative peak for the torque.