Surge Test-based Identification of Stator Insulation Component with PD Activity for Low Voltage AC Motors

Sang Bin Lee, Alireza Naeini, Shesha Jayaram, Greg C. Stone, Mladen Sasic

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

    1 Citation (Scopus)

    Abstract

    Partial discharge (PD) has been identified as one of the root causes of stator insulation failure even for low voltage (LV) ac motors. For reliable operation of variable frequency drive (VFD) motors, a standard acceptance test procedure (IEC STD 60034-18-41) to ensure PD-free operation of LV motors was recently developed. Although the test can verify whether PD exists in the stator for a voltage surge with predetermined voltage level and risetime, the information on where PD activity is present in the stator insulation is not clearly provided. In this paper, a test method for applying variable risetime surge voltage is proposed for identifying the component of stator insulation where PD occurs in the LV random wound motor stator. The proposed test allows the user to locate whether PD is in the turn, phase, or ground insulation. This information is critical for lowering the PD inception voltage for improving the motor reliability through insulation system design/manufacturing or motor/drive system reconfiguration. The test is implemented with a 4.5 kV variable risetime surge generator prototype, and 4 LV ac motors are tested to show where PD is likely to occur in commercial LV motors.

    Original languageEnglish
    Title of host publicationProceedings of the 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2019
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages1-7
    Number of pages7
    ISBN (Electronic)9781728118321
    DOIs
    Publication statusPublished - 2019 Aug
    Event12th IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2019 - Toulouse, France
    Duration: 2019 Aug 272019 Aug 30

    Publication series

    NameProceedings of the 2019 IEEE 12th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2019

    Conference

    Conference12th IEEE International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2019
    Country/TerritoryFrance
    CityToulouse
    Period19/8/2719/8/30

    Bibliographical note

    Publisher Copyright:
    © 2019 IEEE.

    Keywords

    • AC motors
    • Impulse testing
    • Insulation testing
    • Partial discharge (PD)
    • Surges

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering
    • Mechanical Engineering
    • Safety, Risk, Reliability and Quality

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