500kV输电线路覆冰闪络故障原因分析

Analysis of the Causes of Flashover Faults Due to Ice Coating on 500 kV Transmission Lines

为提高电力系统的运行可靠性和安全性,通过对500kV输电线路的覆冰闪络故障进行归纳总结,分析了500kV输电线路覆冰闪络故障的特点和覆冰对绝缘子串的影响,并提出防覆冰闪络的措施,主要有增加绝缘子表面绝缘涂层、采用桥接技术、应用冰除技术、采用大盘径绝缘子隔断、定制复合绝缘子等。最后针对不同桥接方式对绝缘子串抗冰闪能力的影响实验验证。实验结果表明:桥接技术可以实现防止输电线路覆冰闪络故障,但是桥接方式不会导致覆冰闪络故障发生的。

In order to improve the reliability and safety of power system operation,by summarizing the flashover faults due to ice coating on 500 kV transmission lines,the characteristics of flashover faults due to ice coating on 500 kV transmission lines and the influence of ice coating on insulator strings are analyzed,and the measures to prevent flashover due to ice coating are proposed,mainly including increasing the insulating coating on the surface of insulators,adopting bridging technology,applying ice removal technology,using large-diameter insulators for isolation,and customizing composite insulators.Finally,the experimental verification of the influence of different bridging methods on the ice flash resistance of insulator strings is carried out.The experimental results show that bridging technology can prevent flashover faults due to ice coating on transmission lines,but bridging methods will not cause flashover faults due to ice coating.