500 kV输电线路OPGW光缆引下线电流异常原因分析  

Cause Analysis of Current Anomalies in OPGW Fiber Optic Drop Cable Line of 500 kV Transmission Line

作　　者：何坚 杨勇 李特 姜凯华 叶昊亮 HE Jian;YANG Yong;LI Te;JIANG Kai-hua;YE Hao-liang(State Grid Zhejiang Electric Power Co.,Ltd.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,浙江杭州310014

出　　处：《电工电气》2024年第12期63-67,共5页Electrotechnics Electric

基　　金：国网浙江省电力有限公司科技项目(5211DS23000L)。

摘　　要：输电线路运行过程中,架空地线受空间电磁场影响产生感应电压,在两条地线之间、地线和大地之间会形成感应电流。分析了一起500kV输电线路光纤复合架空地线(OPGW)光缆引下线电流异常原因,收集了线路和站内构架处的设计数据,对现场OPGW在构架处的实际接地方式进行了检查,仿真了不同工况下的OPGW感应电流幅值。结果表明,OPGW构架顶端接地不畅是导致OPGW光缆引下线电流异常增大的重要原因,同时由于输电线路本身存在负荷电流三相不平衡,且实际运行中加装后备线夹,普通地线接地方式发生改变,一定程度上增大了OPGW感应电流幅值,导致构架处电流增大。针对此类问题,提出OPGW光缆构架接地设置专用接地端子及运行中降低线路三相负荷电流不平衡程度等建议。In the process of transmission line operation,the overhead ground wire is affected by the space electromagnetic field to generate induced voltage,among two ground lines,the induced current is formed between the ground wire and the earth.This article analyzes the cause of current in the anomalies optical fiber composite overhead ground wire(OPGW)fiber optic drop cable on a 500 kV transmission line,collects design data at the line and station structure,checks actual grounding mode of OPGW at the structure on site,and simulates the amplitude of OPGW induced current under different working conditions.The analysis results indicate that the poor grounding at the top of the OPGW framework is an important reason for the abnormal increase in the current of the OPGW fiber optic drop cable.At the same time,due to the three-phase imbalance of the load current in the transmission line,and the installation of backup line clamps in actual operation,the grounding mode of the ordinary ground wire has changed,which to some extent increases the amplitude of the OPGW induced current,leads to an increase in the current at the framework.Therefore,setting special grounding terminal for OPGW cable frame grounding and reducing the unbalance of three-phase load current of line during operation are put forward to address such problems.

关 键 词：输电线路 光纤复合架空地线 光缆引下线 感应电压 感应电流 

分 类 号：TM726[电气工程—电力系统及自动化]