高压直流工程换流站交流开关场最后开关/线路保护运行分析

Analysis of the last CB/line protection at AC switch yard in converter substation of HVDC project

结合贵广直流输电工程500kV交流开关场的3/2接线方式,介绍了高压直流输电系统中所特有的交流开关场最后开关/线路保护逻辑。并同时结合实际工程竣工验收过程中出现的500kV母差保护动作异常情况,对最后开关逻辑进行了深入的分析。

According to the 3/2 connection mode in 500 kV AC yard of Gui-Guang HVDC power transmission project, the paper introduces the special last CB/line protection logic about 500 kV AC swith yard of HVDC project. At the same time, the last logic of CB, which based on the abnormal action of 500 kV busbar protection in experiment acceptance, is analysed.