Stator inter-turn fault detection for the converter-fed induction motor based on the adjacent-current phase-shift

This paper presents a sensorless on-line Motor Current Signature Analysis (MCSA) method to detect and locate an inter-turn short-circuited fault in the stator winding of the induction machine (IM). It is appropriate for the monitoring of Volts/Hertz controlled inverter-fed systems. The phase-shifts between adjacent line currents of both fundamental harmonic and principal slot harmonic (PSH) are analyzed. Then the fault severity and the fault location feature are derived, respectively. For the purpose of phase signal extraction, synchronous reference frame filter and adaptive phase locked loop (PLL) are integrated into the monitoring system. The robustness and effectiveness of the proposed scheme has been validated by means of laboratory tests.