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

Shu Niu, Shuai Li, Jizhong Liang, Guodong Li, Fan Hu, Hai Zhang, Yujie Zhu (), Xianhao Fan () and Chuanyang Li
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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

Energies, 2024, vol. 17, issue 11, 1-10

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.

Keywords: gas-insulated switchgear; insulated pull rods; corona discharge; simulation analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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