接地体材料及结构对城区配电架空线路杆塔降阻的影响  

Influence of Grounding Material and Structure on the Resistance Reduction of Tower Grounding Grid in Urban Distribution Overhead Lines

作　　者：牛景光 咸日常[1] 孙学锋 刘兴华 胡元潮[1] 于洋 NIU Jing-guang;XIAN Rl-chang;SUN Xue-feng;LIU Xing-hua;HU Yuan-chao;YU Yang(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255049,China;State Grid Zibo Power Supply Company,Shandong Electric Power Corporation,Zibo 255032,China)

机构地区：[1]山东理工大学电气与电子工程学院,淄博255049 [2]国网山东省电力公司淄博供电公司,淄博255032

出　　处：《科学技术与工程》2018年第20期116-122,共7页Science Technology and Engineering

基　　金：山东省自然科学基金(ZR2016EL17);北京华北电力大学教育基金会EPTC创新基金(EPTC201702)资助

摘　　要：针对城区配电线路接地极水平敷设受地域限制,构造接地体比较困难的问题,从接地极的形状入手,提出了螺旋状结构的接地极形式;并且采用了柔性石墨复合材料,用于改进传统的金属接地极。首先仿真对比了水平和垂直接地体的降阻效果,然后构建了5种不同结构接地极的仿真模型,对不同土壤分层情况下的杆塔接地电阻进行仿真计算,分析了不同结构接地极的降阻效果;最后研究石墨螺旋接地极的各项参数对接地电阻的影响。研究表明:(1)螺旋状接地极的降阻效果最好;(2)φ28 mm石墨螺旋接地极的性能优于φ10 mm镀锌钢接地极,适用于配电线路杆塔接地;(3)螺旋接地体材料的截面直径、圈数、等效半径均对接地电阻值有不同程度影响。研究内容可应用于城区配电线路杆塔接地装置设计和施工,具有工程应用价值。It is generally difficult to construct grounding systems in urban distribution lines when the horizontal area is limited by region.To address this problem,a prototype of grounding electrode in a spiral structure was proposed,and flexible graphite composites were used to improve the conventional metal grounding electrodes.Firstly,the simulated results of the horizontal and vertical grounding electrodes resistance reduction were compared,and the simulated prototypes of grounding electrode were then built in five different structures.On this basis,the grounding resistances of pole and tower were simulated for various patterns of layered soil,and the resistance reducing effects of all the structurally different grounding electrodes were compared.Finally,the influences of the parameters of the graphite spiral grounding electrode on the grounding resistance were analyzed.The results indicate that：（1） spiral grounding electrodes have the best effect of ground resistance reduction;（2）the 28 mm graphite spiral grounding electrodes are more excellent than 10 mm galvanized steel grounding electrodes and can be applied for distribution lines tower grounding;（3）the diameter,winding number and equivalent radius of the spiral grounding electrode have different degrees of influence on it.This study is applicable in designing and constructing the grounding device of distribution line towers in urban areas,constituting valuable tools for engineering practices.

关 键 词：配电线路杆塔 接地降阻 垂直接地体 螺旋形接地体 石墨复合接地极 

分 类 号：TM854[电气工程—高电压与绝缘技术]