A closed-form solution to fault parameter estimation and faulty phase identification of stator winding inter-turn fault in induction machines

Stator winding inter-turn fault is a common fault in induction machines. A substantial number of works have been developed for detection of this fault; however, there are only a few works on fault parameter estimation and faulty phase identification. In particular, there have been no works dealing with estimation of fault loop resistance. This paper presents a method for estimating the fraction of shorted turns and the fault loop resistance and identifying the faulty phase under steady-state condition. It provides a closed-form solution and hence is applicable to online fault detection and identification. Simulation results demonstrate the effectiveness of the proposed method.