110 kV电缆终端连续故障原因及防范分析

Causes of Continuous Failure of 110 kV Cable Terminal and Its Prevention

针对几起连续发生在一条110 kV电缆线路上的电缆终端击穿故障,通过现场解剖和理论分析,发现导致此类故障的原因是铅封断裂,致使铝波纹护套上的感应电压放电,最终击穿绝缘引发故障。随后对铅封断裂的原因进行了分析,指出了该条电缆线路上存在的施工工艺问题和故障隐患,并给出了避免此类故障再发生的建议。

Because of several breakdown faults of cable terminals occurring continuously on a 110 kV cable line,this paper points out that the fundamental cause of these faults is the breakdown of the lead seal,which results in the in duced voltage discharge on the aluminum sheath,and finally breaks down the insulation and causes the fault.The rea son for lead seal fracture was analyzed subsequently,and the construction technology problems and hidden troubles of the cable line are studied.Finally,some suggestions are given to avoid the recurrence of such faults based on the a nalysis of the reasons.