Detection of Inter-Turn Stator Faults in Induction Motors Using Short-Term Averaging of Forward and Backward Rotating Stator Current Phasors for Fast Prognostics

• Published in: IEEE transactions on magnetics Vol. 53; no. 11; pp. 1 - 7
• Main Authors: Dorrell, David G., Makhoba, Khanyisani
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Circuit faults; Coils; Computer simulation; Fault detection; Induction motor; Induction motors; Industrial applications; Insulation; Magnetism; Mathematical model; Motors; Phasors; sequence components; short circuit; stator winding; Stator windings; three phase; Windings
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2017.2710181

Stator-related failures in induction machines are often encountered in industrial applications due to the unforeseen insulation damage. This paper addresses the fast prognosis of inter-turn faults. It presents simulation and measurement of the stator winding short circuit faults of a three-phase induction motor. A 50 Hz four-pole 2 hp induction motor was operated under healthy and faulty conditions and the increase in backward sequence current component assessed. It was found that the negative sequence component is a powerful component for the detection of inter-turn faults and simple algorithms allow it to be monitored and faults detected.