With the rapid development of the railway industry,people's lives are more and more inseparable from the transportation mode of high-speed railway,and the higher requirements for railway security are put forward.Electrified railway is a kind of mnodern transportation means,which is based on electric energy.In the process of equipment maintenance,the traction power supply system is particularly important.If the traction power supply system is struck by lightning,the loss is very huge.Therefore,the lightning is one of the main causes of the failure of traction power supply system.So,this paper expounds the threat of the railway traction power supply systemn and safety of railway transportation caused by thunder and lightning,analyzes the problems in lightning protection and analyzes the causes of insulator flashover caused by lightning stroke to put forward some suggestions for improving the lightning protection system of railway traction power supply system.%随着铁路行业的迅速发展,人们的生活越来越离不开便捷高速的铁路运输方式,并对其安全性提出了更高的要求.电气化铁路是以电能为牵引动力的一种现代化交通运输工具,在其设备维护的过程中,牵引供电系统是否正常运行显得尤为重要,如果被雷击中损失巨大.因此,雷击是引起牵引供电系统故障主要原因之一.鉴于此,本文阐述了雷电对铁路牵引供电系统以及铁路运输安全造成的威胁,浅析了雷电防护中存在的问题,并对雷击所导致绝缘予闪络的原因进行了分析,提出了一些改善优化铁路牵引供电系统防雷体系的建议.
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