An online technique for monitoring the insulation condition of AC machine stator windings

Sang Bin Lee, Karim Younsi, Gerald B. Kliman

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

A novel online technique for monitoring the insulation condition of ac machine stator windings is proposed in this paper. The concept is to measure the differential leakage currents of each phase winding from the terminal box in a noninvasive manner to assess the insulation condition during motor operation. The conventional differential CTs used for phase fault protection can be replaced with high performance current sensors to measure the leakage current with higher accuracy. Indicators for insulation condition such as the capacitance and dissipation factor are calculated based on the measurements to provide a low cost solution for online insulation condition assessment. A simplified online insulation system model is derived for analysis and interpretation of the measured data. Experimental results on a 15-hp induction motor under simulated insulation degradation conditions show that the proposed technique is a very sensitive method capable of detecting incipient signs of insulation degradation.

Original languageEnglish
Pages (from-to)737-745
Number of pages9
JournalIEEE Transactions on Energy Conversion
Volume20
Issue number4
DOIs
Publication statusPublished - 2005 Dec

Keywords

  • AC machines
  • Dielectric losses
  • Fault diagnosis
  • Insulation testing
  • Leakage currents
  • Monitoring

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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