一起直流换流站换流失败引起的继电保护不正确动作分析及探讨

Analyzing and Discussing on a Case of Relay Protection Incorrect Action Caused by the Exchanging Fault in DC Exchange Station

对220kV线路两侧突变量方向保护不正确动作原因进行了分析,在故障分析过程中利用标准COMTRADE格式的故障录波数据对保护装置进行了故障再现及回放试验。通过分析和试验,提出了超高压交流电网和直流电网并联运行时,如何防范直流换流站换流失败引起高压交流电网中继电保护不正确动作的新课题,文章对这一新课题进行了有益的探讨,并有针对性地提出和采取了具体有效的防范措施。

The reason of abrupt variable direction protection incorrect action in both sides of 220kV transmission line has been analyzed, the fault reappearance & replay test also has been made using the standard COMTRADE format fault recording data in this analyzing process. According to which, the author presented a new task that how to keep away the relay protection incorrect action of HV AC power network caused by the exchanging fault in DC exchange station when EHV AC and DC power network are operated in parallel connection, discussed on this new task, and presented/adopted pertinent effective prevent measures.