基于邻近斜坡土钉墙结构的电力杆塔接地降阻方式研究  

Research on Grounding Resistance Reduction Method of Power Tower Considering Adjacent Soil Nailing Wall Structure

作　　者：李阳 刘书辉 刘子平 亓孝武 平宗飞 LI Yang;LIU Shuhui;LIU Ziping;QI Xiaowu;PING Zongfei(State Grid Jining Power Supply Company,Jining 272000,China;State Grid Dongli Power Supply Company,Dongli 300300,China;School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]国网山东省电力公司济宁供电公司,山东济宁272000 [2]国网天津市电力公司东丽供电公司,天津东丽300300 [3]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《山东电力技术》2023年第9期18-27,共10页Shandong Electric Power

基　　金：国网山东省电力公司科技项目(520606220003)。

摘　　要：针对道路沿线陡坡处的输电线路杆塔接地电阻较高的问题,提出通过陡坡地形中的土钉墙支护内的钢筋网辅助散流降阻的方法,搭建道路沿线陡坡地形的杆塔接地网与土钉墙的模型,对比连接土钉墙前后接地电阻、跨步电压等接地参数变化,并分析土钉墙与杆塔接地网的连接线数量、连接位置、连接材质以及杆塔接地网位置对杆塔接地网接地电阻的影响。仿真结果表明:土钉墙对杆塔接地网的降阻效果可达到19.3%~73.4%,且接地网所处的土壤表面跨步电压最高不超过6 kV,验证了土钉墙散流降阻方法的可行性。连接线数量越多,接地电阻越小,但降阻效率在连接线数量为4根时达到56.3%,趋于饱和;连接位置越分散,杆塔接地电阻越小;采用石墨复合材料的连接线比镀锌钢材质的降阻效率高9.04%,接地网设于斜坡,可以具有更低的接地电阻。To solve the problem of high grounding resistance of transmission line towers along steep slopes along the road,a method of using steel mesh inside soil nail wall support in steep slope terrain to assist in reducing resistance by dispersing current was proposed.The model of pole tower grounding network and soil nailing wall along steep slope terrain along the road was built.The number,location,material,and position of the connecting wires between the soil nailing wall and the tower grounding grid,which have an impact on the grounding resistance of the tower grounding grid were analyzed.The simulation results show that the resistance reduction effect of soil nailing wall on the tower grounding grid can reach 19.3%~73.4%,and the maximum step voltage of the soil surface where the grounding grid is located is not more than 6 kV,which verifies the feasibility of the soil nail wall scattering resistance reduction method.The more the number of connecting wires,the lower the resistance,but the resistance reduction efficiency tends to saturate when the number of connecting wires is 4,reaching 56.3%.The more scattered the connection position,the smaller the ground resistance of the tower.The new graphite composite wire has 9.04%higher resistance reduction efficiency than galvanized steel wire,and the grounding net is set on the slope,which can have lower grounding resistance.

关 键 词：接地电阻 输电线路 土钉墙 外延接地 

分 类 号：TM726[电气工程—电力系统及自动化]