Proceedings of the KSR Conference (한국철도학회:학술대회논문집)

The Korean Society for Railway (한국철도학회)
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Insulation Evaluation of Low-voltage Induction Motors by Surge Voltages

서지전압에 의한 저압유도전동기의 절연평가

  • 최수연 (한국해양대학교 전기전자공학부 대학원) ;
  • 최재성 (한국해양대학교 전기전자공학부 대학원) ;
  • 박대원 (한국해양대학교 전기전자공학부 대학원) ;
  • 길경석 (국해양대학교 전기전자공학부) ;
  • 송재용 (국립과학수사연구소)
  • Published : 2008.06.12
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Abstract

Inverter-fed induction motors (IFM) are prevalent in traction vehicles. However, the winding insulation of IFM is substantially more stressed than of line-powered motors by surge voltages. Consequently, the winding insulation of IFM should be estimated by surge voltages. Also, the weakness of coil insulation can be detected by the surge voltage test. This paper described the insulation evaluation of induction motors by application of surge voltages. A surge voltage generator with the maximum voltage of 5 kV and the selectable rise-time in ranges of $50\;ns\;{\sim}\;500\;ns$ was fabricated. In the experiment, we applied surge voltages into induction motors with the magnitude and the risetime according to IEEE 522. By the analysis of applied surge voltage and current waveforms, we could find difference between normal and defection windings.

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