500kV串联电容补偿装置故障引起的保护动作及措施

Analysis and Measures of Protection Action Caused by a 500 kV Series Compensation Equipment Fault

通过一起串联电容补偿装置故障,分析了最大外部故障电流保护和电容器不平衡保护的动作及火化间隙触发原因。提出了通过改善平台二次电缆屏蔽的办法,提高保护动作可靠性;通过滤波处理和增加电容器总支路电流互感器的办法,解决电容器不平衡保护的设计缺陷;通过增加触发回路监视措施,以方便今后火化间隙误触发分析。

Through a fault of series compensation equipment, the reasons of the action of maximum external ＂fault current protection, capacitor unbalance protection, and trigger of spark gap are analyzed in the paper. The reliability of protection action is improved with improving shield of secondary cable of platform. The design defect of capacitor unbalance protection is solved through processing filter and increasing the current transformer on aggregate expenditure capacitor branch. Through increasing the monitoring measures for spark gap trigger circuit, the analysis of mal-trigger of the spark gap in future is facilitated.