An online groundwall and phase-to-phase insulation quality assessment technique for AC-machine stator windings

Sang Bin Lee, Jinkyu Yang, Karim Younsi, Raj Mohan Bharadwaj

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

An online technique for monitoring the condition of the groundwall (GW) and phase-to-phase (PP) insulation for three-phase ac-machine stator windings is proposed in this paper. Insulation-condition indicators such as capacitance, dissipation factor (tan δ), and ac insulation resistance are calculated online based on the differential leakage-current measurements for each phase. A model for a three-phase ac-machine insulation system is derived and analyzed for both offline and online testing. Guidelines for interpreting the measured indicators for determining the: 1) overall condition and 2) significant degradation in the individual GW and PP insulation for each phase of the stator are given based on the analysis. Experimental results on a 15-hp induction motor under intentional GW and PP insulation degradation conditions show that incipient insulation degradation can be detected and classified with high sensitivity.

Original languageEnglish
Pages (from-to)946-957
Number of pages12
JournalIEEE Transactions on Industry Applications
Volume42
Issue number4
DOIs
Publication statusPublished - 2006 Jul

Keywords

  • AC machines
  • Capacitance
  • Dissipation factor
  • Fault diagnosis
  • Groundwall (GW) insulation
  • Insulation resistance (IR)
  • Insulation testing
  • Online condition monitoring
  • Phase-to-phase (PP) insulation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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