The negative sequence impedance as fault indicator in induction motors
Keywords:
induction motors, stator fault diagnosis, negative sequence impedance, digital signal processing (DSP)Abstract
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.
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