高压电缆终端击穿故障的分析与处理  

Analysis and Treatment of Breakdown Fault of Hv Cable Terminal Based on Finite Element Method

作　　者：孙永辉[1] 王馥珏 韩宇泽[2] SUN Yonghui;WANG Fujue;HAN Yuze(College of Energy and Electrical Engineering,Hohai University,Nanjing 210098,China;Nanjing Power Supply Company,Nanjing 210000,China)

机构地区：[1]河海大学能源与电气学院,南京210098 [2]南京供电公司,南京210000

出　　处：《兵器装备工程学报》2019年第8期207-211,共5页Journal of Ordnance Equipment Engineering

摘　　要：针对110 kV电缆户外终端击穿故障,建立了故障电缆终端的数学计算模型,等效出故障电缆终端计算的集总电路,利用ANSYS有限元分析软件,建立分析模型,通过网格划分,仿真计算出了故障点绝缘外屏蔽在不同温度场下的发热温升,推导出故障点的在不同气候与负荷条件下极限运行温度,确认了导致击穿故障的主要原因:终端尾管与接地铜编织线、电缆金属护套焊接位置腐蚀导致接触不良,致使电缆金属护套电位悬浮,长期运行下出现发热和灼烧,最终导致电缆绝缘击穿。同时,针对性地提出了预防类似事故发生的措施,为今后同类问题的解决提供了有益的尝试。This paper introduced a breakdown fault of 110 kV cable outdoor terminal.It established the calculation model of cable termination problems,the lumped circuit of equivalent compute fault cable terminal,using ANSYS finite element analysis software,and set up model,through the mesh,the simulation calculation out of the fault point insulation shielding in different temperature field of heating temperature.The point of failure in different climate and load was deduced under the condition of the limit operating temperature,which confirmed that the main cause of the breakdown failure is:the welding position corrosion between the terminal tail pipe and the grounding copper braids and the cable metal sheath leads to poor contact,resulting in the suspension of the cable metal sheath potential,and the occurrence of heat and burning under long-term operation,which eventually leads to the breakdown of the cable insulation.Measures to prevent similar accidents were put forward,which will provide beneficial attempts to solve similar problems in the future.

关 键 词：电缆户外终端 有限元分析 终端尾管 击穿故障 

分 类 号：TM726[电气工程—电力系统及自动化]