摘要
为了弄清季节性冻土区域输电线路的接地故障问题,本文在调研黑龙江区域输电故障接地情况的基础上,研究了土体随含水量和冻融循环的变化情况,给出了分析多次冻融循环过程基础的极限抗拔力,进而获得了冻土区域输电线路的接地故障机理。研究结果表明:1)冻土区域线路运行年限越长,接地体故障几率越大,接地故障容易发生在焊接部分等薄弱位置;2)冻融次数增加导致了杆塔基础极限抗拔力下降,直接引发杆塔地基上拔的现象,从而造成接地体的破坏损伤。针对冻土区域的输电线路接地故障,文中建议采用避开富冰冻土区域等手段,相关的研究结果可为冻土区域输电线路接地的运行检修提供参考。
In order to get the leakage current features of snow covered zinc surge oxide arrester with freeze-thaw process,based on ground fault investigation of transmission lines in permafrost region of Heilongjiang Province,the paper analyzed the change of soil caused by soil moisture and freeze-thaw cycle,and calculated ultimate pullout capacity of tower foundation of transmission lines to obtain ground fault mechanism of transmission lines in permafrost region. The results shows that ground fault probability is rising with running time of transmission lines in permafrost region,and ground fault location is easy to appear in weak position such as welding part of ground;as the frequency of freeze-thaw cycling is increasing,ultimate pullout capacity of tower foundation is decreasing,which causes the arch of foundation and damage of the ground body. Considering ground fault of transmission lines in permafrost region,it is suggested to avoid ice-rich areas of frozen soil. The results can provide the technical support for ground operation of transmission line in permafrost areas.
作者
柳贡强
孙巍
刘春翔
刘中元
周洪毅
曹元成
LIU Gongqiang;SUN Wei;LIU Chunxiang;LIU Zhongyuan;ZHOU Hongyi;CAO Yuancheng(State Grid Heilongjiang Electric Power Co.,Ltd.,Harbin 150090,China;Electric Power Research Institute of State Grid Heilongjiang Electric Power Co.,Ltd.,Harbin 150030,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 43007,China;China State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《电瓷避雷器》
CAS
北大核心
2019年第6期73-77,共5页
Insulators and Surge Arresters
关键词
冻土区域
输电线路
接地故障
冻融过程
高寒
温度变化
permafrost region
transmission line
ground fault
freezing and thawing process
alpine region
temperature variation
作者简介
柳贡强(1979—),男,高级工程师,研究方向为输变电工程运维技术。
