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Simulation and Characterization of Micro-Discharge Phenomena Induced by Glitch Micro-Defects on an Insulated Pull Rod Surface

Author

Listed:
  • Shu Niu

    (State Grid Shanxi Electric Power Company, Taiyuan 030001, China)

  • Shuai Li

    (State Grid Shanxi Electric Power Company, Taiyuan 030001, China)

  • Jizhong Liang

    (State Grid Shanxi Electric Power Company, Taiyuan 030001, China)

  • Guodong Li

    (State Grid Shanxi Electric Power Company, Taiyuan 030001, China)

  • Fan Hu

    (State Grid Shanxi Electric Power Company, Taiyuan 030001, China)

  • Hai Zhang

    (State Grid Shanxi Electric Power Company, Taiyuan 030001, China)

  • Yujie Zhu

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

  • Xianhao Fan

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

  • Chuanyang Li

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

Abstract

The reliability of GIS (gas-insulated switchgear) circuit breakers significantly depends on the condition of the insulated pull rods, with micro-defects on their surface posing a potential risk for micro-discharges and breakdown incidents. Experimentally investigating these micro-discharges is challenging due to their minute nature. This study introduces a framework to examine the linkage between micro-defects and micro-discharges, coupled with numerical simulations of the micro-discharge process in insulated pull rods afflicted by surface infiltration flaws under operational conditions. Initially, samples containing micro-defects were sectioned via water jet cutting for microstructural analysis through white light interferometry. Subsequently, a two-dimensional axisymmetric model simulating positive corona discharge from a needle to a plate electrode was employed to derive the relationship between charged particle density and the electric field in SF 6 and air. Building on these observations, a micro-discharge model specific to micro-defects was developed. Comparative analysis of micro-discharge behaviors in SF 6 and air for identical defect types was conducted. This research framework elucidates the discharge dynamics of charged particles in SF 6 and air during micro-discharge events, shedding light on the mechanisms underpinning micro-discharges triggered by insulation rod defects.

Suggested Citation

  • Shu Niu & Shuai Li & Jizhong Liang & Guodong Li & Fan Hu & Hai Zhang & Yujie Zhu & Xianhao Fan & Chuanyang Li, 2024. "Simulation and Characterization of Micro-Discharge Phenomena Induced by Glitch Micro-Defects on an Insulated Pull Rod Surface," Energies, MDPI, vol. 17(11), pages 1-10, May.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2594-:d:1403387
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    References listed on IDEAS

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    1. 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.
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