Effect of Voltage Unbalance and Stator Inter-Turn Short Circuit on the Characteristic of Three Phase Induction Motor

Abstract: The induction motor operate satisfactory on balanced normal conditions. It is low operating and maintenance cost and energy efficient electro mechanical drive. It is used in all industrial processes as there is no alternative to induction motor in industry. During operation, various stresses are developed in induction motor which may cause failure of motor. So, there is wastage of time and revenue loss. There is variation in supply conditions in distribution system. It is essential to diagnose the performance of motor on unbalanced supply conditions and stator inter turn short circuit fault. In this paper induction motor model is derived for symmetrical and asymmetrical conditions to diagnose the performance at unbalanced supply voltage and stator inter turn short circuit fault.

Keywords: Induction motor, inter-turn faults, diagnosis, balanced and unbalanced conditions