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An Ultrasonic Pulse-Echo Method to Detect Internal Defects in Epoxy Composite Insulation

Author

Listed:
  • Fangyuan Tian

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

  • Yanpeng Hao

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

  • Zhouyiao Zou

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

  • Yao Zheng

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

  • Weiming He

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

  • Lin Yang

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

  • Licheng Li

    (School of Electric Power, South China University of Technology, Guangzhou 510640, China)

Abstract

Voids or cracks in basin insulators inside a GIS (gas-insulated metal-enclosed switchgear) could trigger partial discharges or surface flashover under electrical stresses, threatening safe GIS operation. For this paper, some epoxy composite specimens were made from similar materials and manufacturing processes to make 252 kV GIS basin insulators. Some voids with different diameters or cracks with different diameters and orientations were artificially made in the specimens with different thicknesses. An ultrasonic pulse-echo system was set up, and ultrasonic tests were carried out on the specimens with voids or cracks. A method to calculate the depth of a defect was proposed by the propagation time of defect reflected waves. The results showed that a depth of 50 mm, a diameter φ of 2 mm void, and a diameter φ of 1 mm crack in epoxy composite insulation were detected by the ultrasonic system using a 1 MHz transducer.

Suggested Citation

  • Fangyuan Tian & Yanpeng Hao & Zhouyiao Zou & Yao Zheng & Weiming He & Lin Yang & Licheng Li, 2019. "An Ultrasonic Pulse-Echo Method to Detect Internal Defects in Epoxy Composite Insulation," Energies, MDPI, vol. 12(24), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4804-:d:298752
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    Cited by:

    1. Zhouyiao Zou & Yanpeng Hao & Fangyuan Tian & Yao Zheng & Weiming He & Lin Yang & Licheng Li, 2020. "An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear," Energies, MDPI, vol. 13(5), pages 1-21, March.

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