水对充油电缆终端击穿位置的影响机理分析  

Influence mechanism analysis of water on breakdown position of oil-filled cable terminal

作　　者：张静 万成德[1,2] 程林 胡长猛 宋鹏先[3] 黄勤清 ZHANG Jing;WAN Chengde;CHENG Lin;HU Changmeng;SONG Pengxian;HUANG Qinqing(Nanrui Group(State Grid Electric Power Research Institute)Co.,Ltd.,Nanjing 211006,China;Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute,Wuhan 430074,China;Tianjin Electric Power Research Institute of State Grid Tianjin Electric Power Company,Tianjin 300384,China)

机构地区：[1]南瑞集团(国网电力科学研究院)有限公司,江苏南京211006 [2]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074 [3]国网天津市电力公司电力科学研究院,天津300384

出　　处：《绝缘材料》2025年第3期152-157,共6页Insulating Materials

基　　金：国家电网有限公司总部科技项目(5500-202326176A-1-1-ZN)。

摘　　要：为研究水对充油电缆终端击穿位置的影响,仿真分析了水引起的220 kV充油电缆终端的故障原因,并在实验室搭建了电缆试验平台,模拟验证了接地状态与电场强度对击穿位置的影响,并采用高频电流局放检测仪及摄像机分别记录了电缆在不同接地状态和电场强度下的局部放电量与水膜高度。结果表明:油中水含量、接地状态及电场强度是影响充油电缆终端故障点位置的重要因素。当水浸入电缆终端并达到一定量且电缆终端直接接地时,电场强度越高,水分子从油-水界面逸出越多,水膜高度越高,击穿点距离应力锥上表面的距离越长,局部放电量越大。局部放电程度与水膜高度正相关,可以通过局部放电评估电缆终端内硅油劣化缺陷程度,为充油电缆终端绝缘状态评估提供参考。To investigate the influence of water on the breakdown position of oil-filled cable terminal,this study simulated and analyzed the failure reason caused by water in the 220 kV oil-filled cable terminal.A cable test platform was established in the laboratory,and the influence of the grounding state and electric field strength on the breakdown position was simulated.The partial discharge(PD)quantity and water film height of the cable in different grounding states and at different electric field strength were recorded by using high frequency current partial discharge detector and camera.The results show that the water content in oil,grounding state,and electric field strength are the important factors affecting the fault location of oil filled cable terminal.When the water is immersed in the cable terminal and reaches a certain amount,and the cable terminal is directly grounded,the higher the electric field strength,the more water molecules escape from the oil-water interface,the higher the water film height,the longer the distance between the breakdown point and the upper surface of stress cone,and the larger the partial discharge.The intensity of PD is positively correlated with water film height,and the silicone oil degradation defects within the cable terminal can be evaluated by partial discharge,which provides a reference for evaluating the insulation status of oil-filled cable terminal.

关 键 词：电缆终端 绝缘油 水 电场仿真 接地状态 击穿位置 

分 类 号：TM247[一般工业技术—材料科学与工程]