接触网电动隔离开关低压回路过电压分析及防护

Analysis and Protection of Overvoltage in Low-voltage Circuit of Electric Disconnector of Overhead Contact Line

电气化铁路接触网开关容易因工频短路故障或雷击等原因产生过电压。本文分析了接触网开关低压回路产生工频过电压及雷电过电压的原因并进行初步计算,探讨了其对牵引变电所等供电设施可能产生的影响及危害;在此基础上明确过电压防护的总体原则,提出合理的工程设计措施及建议。

The switches of overhead contact line for electrified railway are prone to overvoltage due to power frequency short circuit fault or lightning strikes.The paper analyzes the causes of power frequency overvoltage and lightning overvoltage generated by low-voltage circuit of switches of overhead contact line,and makes preliminary calculation,and discusses its possible impact and harm on power supply facilities such as traction substation.On this basis,the overall principle of overvoltage protection is clarified,and reasonable engineering design measures and suggestions are put forward.