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As altitude increases, the surface flashover voltage of insulators decreases. With the continuous construction of ultra-high voltage direct current (UHV DC) power grids in high-altitude areas, the external insulation design of converter valves has become a controlling factor in engineering construction. This paper conducts an experimental study on the pollution flashover performance of converter valve components in UHV DC projects. Pollution flashover tests were carried out under two altitude conditions (0 m and 4300 m), different salt deposit densities, and different humidity levels. The influence laws of altitude, salt deposit density, and humidity on the external insulation pollution flashover of converter valve devices were obtained. Test results show that under different pollution conditions, the pollution flashover voltage at 70% humidity is 1.9 to 2.6 times that at 100% humidity, and the pollution flashover voltage decreases by 6.4% to 8.7% per kilometer of altitude increase. The research results can provide guidance for the external insulation design of converter valves in high-altitude areas.

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Research on Pollution Flashover Characteristics of External Insulation Components for Converter Valves in High-Altitude Areas

  • 会议论文

  • 发表日期：

    2026年

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  • Tian Liang,
  • Huang Ruiping,
  • Zhang Zongxi,
  • Nima Shida,
  • Lv Pinlei,
  • Jiang Dexi

摘要

As altitude increases, the surface flashover voltage of insulators decreases. With the continuous construction of ultra-high voltage direct current (UHV DC) power grids in high-altitude areas, the external insulation design of converter valves has become a controlling factor in engineering construction. This paper conducts an experimental study on the pollution flashover performance of converter valve components in UHV DC projects. Pollution flashover tests were carried out under two altitude conditions (0 m and 4300 m), different salt deposit densities, and different humidity levels. The influence laws of altitude, salt deposit density, and humidity on the external insulation pollution flashover of converter valve devices were obtained. Test results show that under different pollution conditions, the pollution flashover voltage at 70% humidity is 1.9 to 2.6 times that at 100% humidity, and the pollution flashover voltage decreases by 6.4% to 8.7% per kilometer of altitude increase. The research results can provide guidance for the external insulation design of converter valves in high-altitude areas.