500kV交直流线路雷击特性比较研究

摘要:

500 kV 交直流线路是当前电力输送的主要通道，雷击跳闸是500 kV 线路跳闸的主要原因。使用电磁暂态软 件ATP － EMTP 对500 kV 交直流线路的雷击机理进行仿真，通过对500 kV 线路反击和绕击特性的比较和研究，表明 500 kV 交直流线路的雷击机理并无本质区别，500 kV 线路雷击跳闸以绕击为主的特征是由架空输电线路电气结构决 定的。研究结论为500 kV 交流线路的防雷经验借鉴至± 500 kV 直流线路提供了思路。

Abstract:

500 kV AC and DC transmission lines are the primary channel for power transmission，and the tripping fault caused by lightning stroke on 500 kV transmission line is the major reason for line tripping． The electromagnetic transient software ATP － EMTP is used for the mechanism analysis of lightning stroke． By comparing the characteristics of back flashover and shielding failure in 500 kV AC and DC transmission lines，it is shown that there is no essential difference in electrical characteristics of AC and DC lines and the electrical structure of overhead transmission line leads to the frequent shielding failures． The result provides the theoretical basis for applying the experiences of protection against lightning in 500 kV AC transmission line to 500 kV DC transmission line．