换流站LZ-96距离保护误动原因分析研究

Study on the Malfunction Reason Analyzing of LZ-96 Distance Relay in HVDC Converter Station

葛洲坝换流站清换线于 1 996年 6月 1 7日和 1 997年 8月 8日在换流站内发生反方向单相故障时 ,LZ- 96距离保护都发生了误动。为了防止该保护再次误动 ,结合事故过程及故障录波对该保护的误动原因进行了认真的分析研究 ,并在现场查明了误动原因。

On july 17 th,1996 and august 8 th,1997,when the reverse direction single phase fault occurred in the HVDC converter station on the Qing Jiang to Gezhouba transmission line,all the LZ 96 type distance relay have the malfunction.To prevent this kind of malfunction,a thorough analysis and study have been carried out based upon the fault situation and TFR fault wave records.And finally the reason of malfunction has been found.