Detection of Stator Faults in Induction Motors Using Pole Voltages

This paper analyzes the effects of inter-turn short circuits on the pole voltages of induction motors (IM). Based on these voltages, a strategy is proposed to detect the fault, determine its location in the winding, and quantify its severity. For this purpose, the fundamental component of the difference between the pole voltages is used as a residual. An IM with access to the poles and different numbers of turns for creating short circuits was used to evaluate the proposal. The experimental results show a high sensitivity of the strategy for diagnosing incipient short circuits.