Winding fault diagnosis of induction machine connected to a harmonically polluted power system

Most cases of electrical machines are connected directly to the low voltage power system without inverter, which can be subjected to a harmonic pollution at any time. The presence of these harmonics can compromise the reliability of the fault detection. In this paper, we present the winding fault diagnosis of induction machine connected to a harmonically polluted low voltage power system. The detection method is based on the Hilbert transform. This proposed approach allows the suppression of the harmonics from the network while keeping all possible clues to the presence of winding fault in the induction machine. The proposed approach is tested experimentally to an induction machine subjected to a 2.5% of inter-turns short circuit fault.