Though the lightning protection and grounding of traction substation is relatively well designed, but accidents of burning loss of the secondary devices still occur, affecting the normal operation of the traction substation. A deep analysis is conducted on the lightning protection of the conduct wire of OCS, the disconnector grounding scheme and the integrated automation power supply of the integrated automation system of the traction substation. Factors and mechanisms affecting the safety operation of the secondary devices of traction substation are studied, and measures to improve the reliability of the secondary devices of traction substation are put forward, such as setting up lightning protection line of OCS, improving grounding scheme of the disconnector and improving the integrated automation system power supply. These measures allow the traction substation to resist strong electric intrusion.%目前牵引变电所有较为完善的防雷电和接地设计,但针对二次设备烧损的事故仍有发生,影响到牵引变电所的安全运行.针对牵引变电所馈出供电线防雷、接触网隔离开关接地方案和所内综合自动化系统的电源回路进行深入分析,研究出多项影响牵引变电所二次设备安全的因素和机理,提出接触网架设避雷线、完善隔离开关接地、改进综合自动化系统电源回路等提高牵引变电所二次设备可靠性的措施.这些措施能够提高牵引变电所设备防强电侵入的综合能力.
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