Online Techique to Detect Shorted-Turns in Stator Windings of 3-Phase Induction Motors

Abstract

This paper presents an online technique to detect shorted-turns in stator windings of 3ø induction motors. This detection is based on summation of threc instantancous phase voltages which is regarded as a stator fault signal. The technique is implemented by an analog circuit due to it’s simplicity and low cost. With this method. The machine must be star connected with folating neutral. From experimental results on a 3ø induction motor designed for turn-to-turn short, it is found that the circuit of stator fault signal level is capable of effective detection. The level of stator fault signal increases with number of shorted turns.