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With the growing adoption of composite material towers in modern power systems due to their advantages in sustainability, compactness, and reliability, understanding their performance under extreme environmental conditions becomes critical. This study systematically investigates the power frequency flashover and standard switching impulse discharge characteristics of a full-scale 110 kV composite material tower under simulated rainfall. Key variables include rainfall intensity (3, 6, 9 mm/min), rainwater conductivity (100–1500 μS/cm), and air gap distances (1–1.7 m). Experimental results reveal that both rain intensity and conductivity significantly reduce flashover voltage, with the most pronounced effects observed at shorter gaps. For instance, at a 1 m gap, the power frequency flashover voltage decreases by 14.5% under 9 mm/min rainfall and by 11.06% at 1500 μS/cm conductivity compared to dry conditions. These findings provide critical insights for optimizing composite tower design and expanding their application in regions prone to extreme precipitation.

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Study on the Influence of Precipitation on the Discharge Characteristics of Air Gaps in 110 kV Composite Material Towers

  • 会议论文

  • 发表日期：

    2026年

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  • Xiaojun Zhang,
  • Wei Deng,
  • Xinmin Liu,
  • Xiaoguang Li,
  • Zhenguo Liu,
  • Wei Liu,
  • Wenbing Zhuang,
  • Heming Deng

摘要

With the growing adoption of composite material towers in modern power systems due to their advantages in sustainability, compactness, and reliability, understanding their performance under extreme environmental conditions becomes critical. This study systematically investigates the power frequency flashover and standard switching impulse discharge characteristics of a full-scale 110 kV composite material tower under simulated rainfall. Key variables include rainfall intensity (3, 6, 9 mm/min), rainwater conductivity (100–1500 μS/cm), and air gap distances (1–1.7 m). Experimental results reveal that both rain intensity and conductivity significantly reduce flashover voltage, with the most pronounced effects observed at shorter gaps. For instance, at a 1 m gap, the power frequency flashover voltage decreases by 14.5% under 9 mm/min rainfall and by 11.06% at 1500 μS/cm conductivity compared to dry conditions. These findings provide critical insights for optimizing composite tower design and expanding their application in regions prone to extreme precipitation.