Application of morphological max-lifting scheme for identification of induction motor stator inter-turn short circuit

摘要

The harmonic components of stator winding current in induction motor will change under the condition of stator inter-turn short circuit. According to these characteristics, in this paper, a novel technique based on morphological maxlifting scheme is proposed for identification of induction motor stator inter-turn short circuit. A max-lifting scheme is applied to process stator winding currents to extract these characteristics. An indicator, r, is computed to identify the short circuit. The transient model of induction motor is employed to simulate oneturn to six-turn stator inter-turn short circuits in an induction motor. Extensive simulation work has been conducted under normal conditions, abnormal conditions (voltage imbalance and varying load), stator inter-turn short circuit conditions, and conditions of any combinations of the above. The results have shown that the scheme proposed in this paper has a high identification rate for induction motor stator inter-turn short circuit.