摘要
针对冬季雨露、大雾天气下动车组车顶绝缘子闪络问题,利用电准静态场和有限元理论构建了动车组受电弓支撑绝缘子高压部件以及含水分车顶绝缘子的三维模型,研究了有分离水珠的绝缘子沿面电场分布特性,分析了洁净水膜及染污水膜对绝缘子沿面电场分布影响。研究结果表明:含水珠绝缘子对整体空间上的电场分布影响甚微,局部电场畸变强烈,最大场强达原场强6.31倍;绝缘子圆周方向上不对称,近支架端(0°)的最大电场最弱,远离支架端(180°)最大电场最强,最大场强随圆周角度增大而增大,且圆周上最大场强均超过空气电晕起始场强;憎水性丧失染污水膜出现后更易引起车顶绝缘子电晕放电,比洁净水膜的情况影响更剧烈。
In order to solve fog flashover problem of the roof insulator on Electric Motor train Unit（EMU） in rainy and foggy winter environment, 3D finite element model（FEM） of EMU pantograph support insulator and the water droplets on the insulator surfaces are established on the basis of quasi-static electric field and the finite element method. The influence of separated water droplets, clean water films and contaminated water films on the surface electric field distribution along the roof insulator is discussed. The results indicate that the water droplets have almost no influence on the whole electric field but distort the neighboring electric field of the insulator, while the maximum field intensity has 6.31 times of the original field. Considering the asymmetry of the insulator, the maximum field intensities increase with the rise of circumferential angle, and all of them exceed the air corona inception field strength. Moreover, with loss of hydrophobicity, water films induce corona discharge easily and contaminated water films even lead to fog flashover.
出处
《高压电器》
CAS
CSCD
北大核心
2016年第1期36-41,49,共7页
High Voltage Apparatus
基金
国家自然科学基金项目(51177136)~~
关键词
车顶绝缘子
水珠
水膜
电场
有限元
雾闪
roof insulator
water droplet
water film
electric field
finite element model
fog flashover
