高压电缆金属护层多点接地原因分析及预防措施  

Cause Analysis and Preventive Measures of High Voltage Cable Metal Sheath Multipoint Grounding

作　　者：邵新炜 姜玉林 于航 SHAO Xinwei;JIANG Yulin;YU Hang(State Gird Dalian Power Supply Company,Dalian, Liaoning 116011,China)

机构地区：[1]国网大连供电公司,辽宁大连116011

出　　处：《东北电力技术》2020年第11期56-58,共3页Northeast Electric Power Technology

摘　　要：66 kV及以上高压单芯输电电缆作为城市电网的主动脉,通常连接着重要变电站与负荷,是电网安全稳定运行关键所在。而高压单芯电缆的接地系统则是通过不同的接地方式,限制电缆护层的感应电压与接地电流,保护接地点以及电缆接头稳定运行。通过理论与实际相结合的方式,分析了一起高压电缆护层多点接地事故,探寻其产生原因及危害,讨论该类型缺陷的特征与表现形式,最后论述其预防措施。As the main artery of the urban power grid,the high-voltage single-core transmission cable of 66 kV and above is usually connected with important substation and load,which is the key to the safe and stable operation of the power grid.The grounding system of the high-voltage single-core cable restricts the induced voltage and ground loop of the cable sheath through different grounding methods.It protects the grounding point and the stable operation of the cable joint.Therefore,the safety of the grounding system is critical.Through the combination of theory and practice,this paper deeply analyzes a serious multi-point grounding accident of high-voltage cable sheathing,and explores its causes.It analyzes its hazards through calculation,and discusses the characteristics and defects forms of this type.Finally,it expounds a reliable and effective preventive measure.

关 键 词：高压电缆 过热原因 接地电流 多点接地 预防措施 

分 类 号：TM75[电气工程—电力系统及自动化]