Common Mode Voltage based Stator Insulation Testing for Inverter fed Motors with High Resistance Grounding Systems

Muhammad Faizan Shaikh, Byambasuren Battulga, Sang Bin Lee, Carlos Platero

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

Abstract

The failure rate of stator insulation is higher for inverter-fed motors than that of mains-fed motors due to higher electrical and thermal operating stresses. Considering that commercial insulation tests in the field rely on off-line testing at the motor terminals, remote and automated testing is desirable as inverter-fed motors become more prevalent. A novel approach for testing the condition of the ground insulation for inverter-fed motors by leveraging high resistance grounding (HRG) systems is proposed in this paper. HRG systems are becoming more common for drive systems, as they provide safe operation for the equipment and maintenance personnel, while providing service continuity under fault conditions. The main idea of the proposed method is to 1) apply common mode voltage to the ground insulation using the inverter whenever the motor is de-energized, and 2) measure the leakage current through the grounding resistor for performing the capacitance (C) and dissipation factor (DF) tests. C and DF measurements can be trended for identifying thermal aging and contamination in the insulation before ground faults occur. Experimental testing on induction motors shows that the change in C and DF due to insulation defects can be detected for providing remote and automated inverter-embedded insulation testing.

Original languageEnglish
Title of host publication2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages3711-3717
Number of pages7
ISBN (Electronic)9798350316445
DOIs
Publication statusPublished - 2023
Event2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023 - Nashville, United States
Duration: 2023 Oct 292023 Nov 2

Publication series

Name2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

Conference

Conference2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Country/TerritoryUnited States
CityNashville
Period23/10/2923/11/2

Bibliographical note

Publisher Copyright:
© 2023 IEEE.

Keywords

  • Capacitance
  • Common mode voltage
  • Dissipation factor
  • Ground insulation
  • High resistance grounding
  • Inverter
  • Leakage current
  • Rotating machine insulation testing

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering

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