换流站一端带电交流刀闸分闸引起高压直流差动保护误动作事故分析

Analysis and Research on the maloperation accident of HVDC differential protection caused by the separation of one live AC isolator switch

对一起换流站直流差动保护动作事故原因进行分析,提出换流站需要重视的电磁干扰问题,以及相应的保护需要注意选取合适的采样及判断出口方式。

Introduce the process and details of the whole accident in detail,further analyze the causes of the accident,and put forward the problem of electromagnetic interference that the converter station needs to pay attention to,and the protection needs to select the appropriate sampling and judgment methods.