The negative sequence impedance as fault indicator in induction motors

an algorithm to detect inter-turn faults in induction motors based on the negative sequence impedance is presented in this paper. the implementation through a digital prototype is also explained and its results are tested using a 3 hp induction motor designed to induce inter-turn faults. it is concluded that the robustness of the algorithm can detect incipient faults from five turns, and it is a good tool for predictive maintenance of induction motors.