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中文摘要：
列车车顶绝缘子闪络直接影响牵引供电系统安全。冬季车顶绝缘子雾闪事故多发,但国内外对此研究较少。为此,采用FLUENT软件研究了列车运行时车顶绝缘子周围流场分布特性,采用ANSOFT软件仿真分析了不同下落角度水滴作用下绝缘子电场畸变情况,并通过实验探讨了抑制绝缘子雾闪的有效方法。实验结果表明：水滴易生成于列车低速运行阶段,绝缘子背风区是水滴生成的主要区域;高压端降落水滴易引发绝缘子闪络;污层受潮速度与污秽等级有关,施加热气流可以有效抑制闪络发生。
英文摘要：
The flashover of roof insulator is a threat to the transaction power supply system. On the heavy fog day, insulator flashovers frequently, and the researches on it are less at home and abroad. In order to explain this phenomenon, firstly, we analyzed the airflow field distribution of insulator when train is running by using FLUENT. Secondly, we discussed the influence of water droplets with different dropping angle on the electric field of space near insulator by using ANSOFT. Finally, we studied the effective method to suppress the fog flashover by experiment. The results show that globules are easy to be generated when train runs at a low speed, and the wind shadow of insulator is the main place where globules form. Water droplets on high-voltage end are likely to cause insulator flashover. The wetting velocity of filth layer is relevant to pollution degree, and hot airflow has positive effect to suppress flashover.
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