Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Rotor winding inter-turn short-circuit fault detection in wound rotor induction motors using Wing Technique

  • Received : 2021.08.11
  • Accepted : 2022.01.06
  • Published : 2022.04.20
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Abstract

The high probability of a rotor winding failure in a three-phase wound rotor induction motor (WRIM) due to the complicated structure of the rotor necessitates developing efficient techniques for detecting rotor winding faults in their evolving stages. FFT-based motor current signature analysis (MCSA) is extensively used to detect the electric failures of rotors. However, it is complemented by implementing alternative techniques to prevent the failure indicated by the MCSA. Rotor current-based fault detection schemes have been scarcely investigated and implemented in industry. However, this experimental study investigates the rotor winding inter-turn short-circuit (ITSC) faults in a WRIM based on the loci of the symmetrical components of the three-phase rotor currents £ (ir1-ir2) that form a 'Wing Shape.' Hence, the technique is called the 'Wing Technique.' The proposed fault-sensitive and noninvasive approach investigated the effiects of unbalanced stator voltages, constructional imbalances, and instrumentation errors on the measurement of rotor currents. It contributes to diagnosing the motor loading and to monitoring the insulation condition of the rotor windings even under lower fault levels. Experimental results presented for a 7.5 hp, 415 V, four-pole WRIM validate the competency of the proposed technique.

Keywords

References

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