一起220 kV CVT二次失压故障的分析与试验

Fault Analysis and Test on Secondary Voltage Loss of 220 kV Capacitor Voltage Transforme

针对一起220 kV电容式电压互感器(CVT)二次失压的故障,根据其结构特点对可能导致此类故障的各种原因作出分析,结合现场试验,初步判断故障原因为CVT中间变压器一次绕组并联避雷器失效,通过对故障CVT的解体和解体后的试验证实了这个判断。解剖了缺陷避雷器,对避雷器失效的原因作出分析,并提出预防此类故障的措施。

Aiming to the fault of secondary voltage loss of 220 kV capacitor voltage transformer（CVT）inthispaper,variousreasonspossiblyleadingtosuchfault areanalyzedbasedonits structure feature and it is judged preliminarily with combination of test on site that the reason is the out of function of arrester in parallel with intermediate transformer of CVT. The judgment is proved by the disassembly and test of the faulty CVT. The arrester with defect and the out of function reason are analyzed and prevention measures on such fault are proposed.