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Impact of Air Gap Defects on the Electrical and Mechanical Properties of a 320 kV Direct Current Gas Insulated Transmission Line Spacer

Author

Listed:
  • Yuan Deng

    (Department of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
    PingGao Group Co., Ltd., Pingdingshan 467001, China)

  • Xianhao Fan

    (Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)

  • Hanhua Luo

    (Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)

  • Yao Wang

    (Tai’an Taishan High Voltage Switchgear Co., Ltd., Tai’an 271000, China)

  • Keyan Wu

    (Tai’an Taishan High Voltage Switchgear Co., Ltd., Tai’an 271000, China)

  • Fangwei Liang

    (Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)

  • Chuanyang Li

    (Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)

Abstract

Air gap defects inside a spacer reduce its insulation performance, resulting in stress concentration, partial discharge, and even flashover. If such gap defects are located at the interface between the insulation and conductor, a decrease in mechanical stress may occur. In this work, a finite element method-based simulation model is developed to analyze the influence of gap defects on the electrical and mechanical properties of a ±320 kV direct current gas insulated line (DC GIL) spacer. Present findings reveal that a radially distributed air gap produces a more significant effect on the electric field distribution, and an electric field strength 1.7 times greater than that of the maximum surface value is observed at the air gap. The axial distribution dominates the distortion of the surface stress by generating a stress concentration region in which the maximum stress of the air gap is twice the pressure in the surrounding area.

Suggested Citation

  • Yuan Deng & Xianhao Fan & Hanhua Luo & Yao Wang & Keyan Wu & Fangwei Liang & Chuanyang Li, 2023. "Impact of Air Gap Defects on the Electrical and Mechanical Properties of a 320 kV Direct Current Gas Insulated Transmission Line Spacer," Energies, MDPI, vol. 16(10), pages 1-14, May.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:10:p:4006-:d:1143867
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    References listed on IDEAS

    as
    1. Wenqu Wang & Yu Gao & Huicun Zhao, 2022. "The Effect of a Metal Particle on Surface Charge Accumulation Behavior of Epoxy Insulator with Zoning Coating," Energies, MDPI, vol. 15(13), pages 1-13, June.
    2. Chenglong Jia & Wenbin Zhao & Yong Zhu & Wu Lu & Zhong Tang, 2022. "A Numerical Study on the Decomposition and Diffusion Characteristics of SF 6 in Gas-Insulated Switchgear with Consideration of the Temperature Rising Effect," Energies, MDPI, vol. 15(21), pages 1-16, October.
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