Abstract

This paper addresses the diagnostics of inter-turn short-circuits in the stator windings of symmetrical six-phase induction motors supplied by an unbalanced voltage three-phase system. A new approach based on the analysis of the power zero-sequence component is proposed. Both simulation and experimental results are presented, that show the effectiveness of the proposed approach for discriminating between healthy and faulty motor operation, independently of the balanced/unbalanced nature of the supply voltage system.

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