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雾、雨环境中高速列车车顶容易发生击穿烧蚀从而引发事故。针对该问题研究了车顶高压端水滴降落对车顶电场分布的影响,提出了高速列车车顶绝缘优化策略。通过对影响车顶电场的有效水滴分析,建立了车顶分层电场模型,讨论了有效水滴及其周围电场分布状况;利用有限元分析方法建立了仿真模型并讨论了列车速度、水滴速度、车顶设计状况对电场的影响。结果表明:接触网上水滴分布一定时,列车速度升高过程中由有效水滴造成的车顶电场畸变存在最大值,当列车速度为10~15 m/s时,车顶电场畸变程度最大;同时电场畸变程度随接触网上水滴分布密度增大而增大;车顶不平时会升高低压侧电场强度,采用平整车顶会降低低压侧电场强度,但会使高压侧电场强度升高;而采用绝缘材料设计较平整的车顶会降低两侧电场强度,从而减少车顶击穿烧蚀,达到优化目的。
Fog, rain environment, high-speed train roof breakdown breakdown easily lead to accidents. In view of this problem, the influence of droplet landing on the electric field distribution of roof is studied, and the roof insulation optimization strategy of high speed train is put forward. Based on the analysis of effective water droplet influencing roof electric field, a layered electric field model of roof is established, the distribution of effective water droplet and its surrounding electric field is discussed, and the simulation model is established by finite element analysis method. The train speed, water droplet speed, The impact of top design conditions on the electric field. The results show that there is a maximum of electric field distortion caused by effective water droplets when the velocity of the train is increasing. When the train speed is 10 ~ 15 m / s, the distortion of the roof electric field is the highest. Meanwhile, the electric field The distortion degree increases with the increase of the distribution density of water droplets on the contact net. When the roof is not flat, the electric field strength on the low voltage side will increase, and the flat roof will reduce the electric field strength on the low voltage side, but will increase the electric field intensity on the high voltage side. Material design is more flat roof will reduce the electric field strength on both sides, thereby reducing the roof breakdown ablation, to optimize the purpose.