Study on the Dynamic Flashover Characteristics of Water Drops Impinging on the Surface of Silicone Rubber

LI Zong; WANG Naixiao; ZHANG Ruoyu; CAO Bin; WANG Liming

doi:10.13296/j.1001-1609.hva.2025.12.024

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Study on the Dynamic Flashover Characteristics of Water Drops Impinging on the Surface of Silicone Rubber

Research & Analysis | 更新时间：2025-12-09

- Study on the Dynamic Flashover Characteristics of Water Drops Impinging on the Surface of Silicone Rubber
- High Voltage Apparatus Vol. 61, Issue 12, Pages: 175-180(2025)
- 作者机构：
  
  国网山东省电力公司青岛供电公司，山东青岛 266002
  广东电网有限责任公司电力调度控制中心，广州 510000
  清华大学深圳国际研究生院，广东深圳 518055
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2025.12.024
  CLC：
- Received：07 May 2025，
  
  Revised：2025-07-27，
  
  Published：16 December 2025
- 稿件说明：
移动端阅览
LI Zong, WANG Naixiao, ZHANG Ruoyu, et al. Study on the Dynamic Flashover Characteristics of Water Drops Impinging on the Surface of Silicone Rubber[J]. High Voltage Apparatus, 2025, 61(12): 175-180.
DOI：

LI Zong, WANG Naixiao, ZHANG Ruoyu, et al. Study on the Dynamic Flashover Characteristics of Water Drops Impinging on the Surface of Silicone Rubber[J]. High Voltage Apparatus, 2025, 61(12): 175-180. DOI： 10.13296/j.1001-1609.hva.2025.12.024.

摘要

硅橡胶复合绝缘子由于具有憎水性和憎水迁移性被广泛应用于高压输电线路中。在雨、雾、露水等恶劣条件下，由水滴造成的复合绝缘子表面放电会加速表面材料的老化、耐污闪能力的降低。已知硅橡胶表面的静态水滴会使绝缘表面的闪络电压显著下降，而水滴从空中坠落撞击硅橡胶表面的动态闪络过程尚未可知。文中通过滴水闪络试验观察了水滴撞击硅橡胶表面的动态闪络过程，分析了水滴撞击硅橡胶表面的动态闪络特性。研究结果表明，硅橡胶表面的最小闪络电压发生在水滴扩散面积达到最大值的时刻，此刻水滴所产生的闪络电压降接近静态闪络电压降的1.8倍；当水滴开始回缩时，明亮的电弧先转为细丝状的电弧，而后随水滴继续回缩而消失；硅橡胶表面的最小闪络电压随着撞击水滴体积的增大而下降，而水滴电导率对水滴的动态闪络电压几乎无影响。

Abstract

Silicone rubber composite insulator is used widely in high-voltage transmission lines due to its hydrophobicity and hydrophobicity mobility. Under such severe conditions as rain，fog and dew，the surface discharge of composite insulator due to water droplets will accelerate the aging of surface materials and and decrease the anti-pollution flashover ability.It is known that static water droplets on the silicone rubber surface will significantly reduce the flashover voltage of the insulating surface，while the dynamic flashover process of water droplets falling from the air impacting the silicone rubber surface is unknown. In this paper，the dynamic flashover process of water droplet impacting the silicone rubber surface is observed through the water droplet falling flashover test，and the dynamic flashover characteristics of water droplets impacting the silicone rubber surface are analyzed. The study results show that the minimum flashover voltage of the silicone rubber surface occurs when the water droplet diffusion area reaches the maximum and，at this moment，the flashover voltage drop generated by the water droplet is nearly 1.8 times of the static flashover voltage drop. When the water droplet starts to shrink，the bright arc firstly turns into a fine filamentous arc，and then disappears with the continuous shrinkage of water droplet. The minimum flashover voltage of the silicone rubber surface decreases with the increase of the volume of the impact droplet，but the water droplet conductivity has almost no effect on the dynamic flashover voltage of the water droplet.

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