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潮湿天气环境中,凝集在车顶绝缘子表面的水珠会畸变电场,引发电晕放电,影响列车运行安全。文中针对车顶受电弓支撑绝缘子建立有限元仿真模型,分析了水滴位置、大小、数量等参数对绝缘子沿面电场的影响,并将常用于高电压等级输电线路中的均压环配置原理运用到电压等级较低的车顶绝缘子中,以抑制水珠诱发的电晕放电。结论表明:护套与伞裙连接处水珠对电场畸变最严重;伞裙上半径r=2 mm的水珠对电场畸变影响最严重;水珠间距越大,沿面平均场强越小。确定了均压环环径R=85 mm,管径d=24 mm,屏蔽深度H=50 mm的均压环最佳配置方案。
Wet weather environment, condensation in the roof insulator drops will distort the electric field, causing corona discharge, affecting the safety of train operation. In this paper, the finite element simulation model of the pantograph supporting insulator is established. The influence of the position, size, quantity and other parameters of the water drop on the electric field along the insulator surface is analyzed. The principle of the pressure equalizing ring, which is commonly used in the transmission line with high voltage level, Low-voltage roof insulators to suppress water droplets induced corona discharge. The results show that the water droplet at the junction of the sheath and the shed is the most distorted to the electric field. The waterdrop with the upper radius r = 2 mm of the shed has the worst effect on the electric field distortion. The larger the distance between the waterdrops, the smaller the average field strength along the surface. The optimal configuration of pressure equalization ring with annular ring diameter R = 85 mm, diameter d = 24 mm and shielding depth H = 50 mm was determined.