500kV输电线路地线悬垂线夹的断裂原因  

Fracture Reason of Suspension Clamp of a 500 kV Transmission Line

作　　者：周宇通 张杰 赵洲峰 胡家元 裘吕超 鲁旷达 ZHOU Yutong;ZHANG Jie;ZHAO Zhoufeng;HU Jiayuan;QIU Lüchao;LU Kuangda(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州310014

出　　处：《腐蚀与防护》2023年第1期93-96,101,共5页Corrosion & Protection

基　　金：国家电网有限公司科技项目(5211DS18000J)。

摘　　要：某500 kV输电线路双回路直线塔右侧悬垂线夹断裂导致地线及OPGW光缆掉串。通过体视显微镜、光学显微镜、自动硬度计、扫描电子显微镜等对悬垂线夹断裂的原因进行了分析。结果表明:悬垂线夹紧固螺栓腐蚀严重,金具护套的铝合金材质不合格。螺栓磨损区域表面存在异常组织回火索氏体,表明螺栓曾经历过高温。综合分析表明,地线腐蚀引起的导通不良和断路是导致线夹护套磨损断裂的根本原因。The suspension clamp on the right side of the double circuit tangent tower of a 500 kV transmission line broke,causing the ground wire and OPGW optical cable to drop.The cause of the suspension clamp fracture was analyzed by stereo microscopy,optical microscopy,automatic hardness tester,scanning electron microscopy.The results showed that the fastening bolts of the suspension clamp were corroded seriously,and the aluminum alloy material of the metal fitting sheath was unqualified.There was abnormal tempered sorbite on the surface of the bolt wear area,which indicated that the bolt had experienced high temperature.Comprehensive analysis showed that,poor continuity and open circuit caused by ground wire corrosion were the root causes of the abrasion and fracture of the clamp sheath.

关 键 词：500 kV 输电线路 悬垂线夹 断裂 腐蚀 

分 类 号：TM174[电气工程—电工理论与新技术]