Offline Common-Mode Voltage Based Inverter-Embedded Groundwall Insulation Testing for Motors

Muhammad Faizan Shaikh, Hyeonjun Lee, Byambasuren Battulga, Sang Bin Lee, Greg C. Stone

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, inverter-operated electrical machines have increased significantly. According to multiple works, insulation aging occurs faster for inverter-fed machines due to voltage overshoots and uneven voltage distribution caused by high dv/dt switching at several kHz. This necessitates better insulation monitoring methods so deteriorating insulation quality can be detected before machines fail and industrial process is interrupted. Good monitoring methods achieve a balance between detection reliability and cost requirements. Monitoring methods requiring the installation of expensive/intrusive equipment cannot be justified for all machines. Therefore, a new method for monitoring of ground insulation condition for inverter-fed machines is presented here. It utilizes commonly used sensors usually employed for differential protection and is simple in its application. It can be implemented before/after the motor is started/stopped and can screen out severe insulation deterioration preventing machine failure. The method has been verified experimentally on a 380 V, 18.5 kW induction machine.

Original languageEnglish
Title of host publication2022 International Conference on Electrical Machines, ICEM 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1823-1829
Number of pages7
ISBN (Electronic)9781665414326
DOIs
Publication statusPublished - 2022
Event2022 International Conference on Electrical Machines, ICEM 2022 - Valencia, Spain
Duration: 2022 Sep 52022 Sep 8

Publication series

Name2022 International Conference on Electrical Machines, ICEM 2022

Conference

Conference2022 International Conference on Electrical Machines, ICEM 2022
Country/TerritorySpain
CityValencia
Period22/9/522/9/8

Keywords

  • common-mode voltage
  • Fault diagnosis
  • ground wall insulation
  • insulation capacitance
  • insulation resistance
  • leakage currents
  • rotating machine insulation testing
  • variable speed drives

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering

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