天广直流系统双极线路保护误动作分析

天广直流线路自主化改造后8个月内保护共动作了22次,其中3次为双极线路保护同时动作。对这3次双极线路保护误动作进行了分析,结合厂家给出的突变量保护定值和整定思想,进行了2项整改：降低低电压保护定值和增大突变量保护的动作延时。整改后至今未再发生双极线路保护同时动作情况。

Analysis on the Fault Trip of Bipolar DC Line Protection in Tianshengqiao-Guangzhou HVDC System

8 months after control and protection modification completed in Tianshengqiao-Guangzhou HVDC System, line protection has tripped 22 times. 3 of these are bipolar line protection false tripping, which are analyzed in this paper. Two corresponding methods: lowing the under voltage protection value and increasing the du/dt protection value, are put forward according to the protection threshold values and the setting process given by the manufacturers. No bipolar line protection accident occurs until now with the above methods implemented.