一起串联补偿电容器复杂故障的分析

Analysis on a Complicated Fault of Series Capacitor Compensation Equipment

结合某500kV线路的串联补偿(简称串补)电容器发生的一起多重转换性故障,分析了故障时线路保护和串补保护的动作行为,结果与动作报告及录波数据相符,分析表明故障时火花间隙动作出现异常。通过分析火花间隙的动作原理可知,电容器在短时间内大面积损坏是火花间隙未触发的主要原因。分析了电容器组的接线方式及耐爆容量,表明两并或三并的结构将符合耐爆容量标准的要求。分析了电容器内熔丝保护的特点,说明了电容器损坏的原因。最后,提出了串补电容器设计方案的建议。

According to a multiplex-translating fault between the 500 kV lines and series capacitor compensation equipments,the operations of series capacitor compensation protection and line protection during the fault are analyzed.The analysis results agree with the recorded data and protection operation reports,it shows that the spark gap might have something abnormal during the fault.After analyzing operation principles of the spark gap,it is found that the serious damage of the capacitors in short time is caused by failure to trigger spark gap.By analyzing connection mode and withstand explosion capacity of the capacitors,it shows that two or three-in-parallel connection mode might match with requirement of withstand explosion capacity standard.In consideration of the characteristic of capacitor internal fuse,the damage reason of the capacitors is described.Finally,some design proposals for series capacitor compensation equipments is proposed.