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An Ultrasonic Longitudinal Through-Transmission Method to Measure the Compressive Internal Stress in Epoxy Composite Specimens of Gas-Insulated Metal-Enclosed Switchgear

Author

Listed:
  • Zhouyiao Zou

    (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)

  • Fangyuan Tian

    (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

Situations of internal stress in basin insulators inside gas-insulated metal-enclosed switchgear (GIS) can lead to cracks, which can influence the safety and stability of apparatus. However, there is currently no research on internal stress measurements for composites of GIS basin insulators, and only measurements for surface stress. In this paper, an internal stress measurement method for GIS epoxy composite is proposed using an ultrasonic longitudinal through-transmission technique based on the acoustoelastic effect. An internal stress measurement system is developed to investigate the relationship between the uniaxial compressive internal stress and the velocity of the ultrasonic wave vertical to the stress in epoxy composite within a range of 0–70 MPa, and to calculate the acoustoelastic coefficient of epoxy composite. The effects of system delay are eliminated in measuring the propagation time. Some epoxy composite cuboid specimens with similar materials and using a manufacturing process similar to those of 252 kV GIS basin insulators are synthesized, and the uniformity of the internal stress in cuboid specimens is verified by finite element simulation. The results reveal a linear increase of the ultrasonic longitudinal wave velocity with increasing stress. It has been shown that the average acoustoelastic coefficient of GIS epoxy composites, using the longitudinal waves vertical to the stress, is 4.556 × 10 −5 /MPa. Additionally, the absolute errors of the internal stress measurements are less than 12.397 MPa. This research shows that the ultrasonic method based on the acoustoelastic effect for measuring the internal stress in GIS epoxy composites is feasible.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1248-:d:329819
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    References listed on IDEAS

    as
    1. 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.
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    Cited by:

    1. Zhouyiao Zou & Yanpeng Hao & Yao Zheng & Weiming He & Fangyuan Tian & Lin Yang & Licheng Li, 2020. "Subsurface Stress Measurement in GIS Epoxy Composite by Using LCR Waves," Energies, MDPI, vol. 13(14), pages 1-11, July.

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