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Lightning flashover characteristics of line insulator are the basis for the analysis of lightning resistance performance of lines. For insulators of different materials, there are differences in flashover characteristics. Considering that the discharge characteristics of insulator have statistical characteristics, the discharge characteristics of air gaps are analysed by means of mathematical statistics. Based on the consequences of U50% and volt-second characteristics of 500kV single composite insulator and glass insulator under standard lightning impulse at high altitude, combined with the discharge paths shot by high-speed cameras, analysing the flashover characteristics and the flashover path probability. The mathematical statistics results show that under standard lightning impulse, there is a 67.5% probability that glass insulator flashover mode involves a combination surface and air gap flashover channel, while the flashover of composite insulator mainly occurs along the combination of surface and air gap flashover channel, accounting for 82.5%.

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Analysis of Flashover Characteristics and Flashover Channel of 500 kV Single Insulator Under High Altitude Lightning Impact

  • 会议论文

  • 发表日期：

    2025年

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  • Minchuan Liao,
  • Zicai Zhao,
  • Qianyong Lv,
  • Shaoming He,
  • Xianying Mao,
  • Huan Huang,
  • Lu Qu,
  • Huaifei Chen

摘要

Lightning flashover characteristics of line insulator are the basis for the analysis of lightning resistance performance of lines. For insulators of different materials, there are differences in flashover characteristics. Considering that the discharge characteristics of insulator have statistical characteristics, the discharge characteristics of air gaps are analysed by means of mathematical statistics. Based on the consequences of U50% and volt-second characteristics of 500kV single composite insulator and glass insulator under standard lightning impulse at high altitude, combined with the discharge paths shot by high-speed cameras, analysing the flashover characteristics and the flashover path probability. The mathematical statistics results show that under standard lightning impulse, there is a 67.5% probability that glass insulator flashover mode involves a combination surface and air gap flashover channel, while the flashover of composite insulator mainly occurs along the combination of surface and air gap flashover channel, accounting for 82.5%.