垂直型直流接地极埋深的优化配置研究  

Study on the Optimal Configuration of Buried Depth of Vertical DC Grounding Electrodes

作　　者：陈伟[1] 李少东[2] 孙勇[1] 鲁海亮[2] 蓝磊[2] 文习山[2] CHEN Wei;LI Shaodong;SUN Yong;LU Hailiang;LAN Lei;WEN Xishan(EHV Power Transmission Company Maintenance&Test Center,China Southern Power Grid,Guangzhou 510663,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]中国南方电网超高压输电公司检修试验中心,广州510663 [2]武汉大学电气与自动化学院,武汉430072

出　　处：《电瓷避雷器》2020年第2期56-63,共8页Insulators and Surge Arresters

摘　　要：垂直接地极的主体是分散的数根或数十根垂直电极,这一结构特点使垂直接地极的埋深问题与传统水平接地极有很大区别。本文首先采用单根电极模型研究了典型土壤模型下埋深对接地极电气性能影响,提出垂直接地极埋深选取的基本原则。由于垂直接地极的电极一般呈椭圆形布置,计算发现最大跨步电势往往出现在长轴端部附近,提出适当增大长轴端部附近电极的埋深改善接地极跨步电势分布特性的思路。最后结合长翠村垂直接地极跨步电势的实测数据和仿真计算结果,验证了椭圆长轴端部附近跨步电势较高的规律以及增加长轴端部附近电极埋深的跨步电势分布特性改善方法,本文研究结论可为垂直接地极的设计提供一定参考。The main body of a vertical grounding electrode is a number of scattered vertical electrodes,which makes buried depth of vertical grounding electrodes very different from that of traditional horizontal grounding electrodes.In this paper,single electrode models are used to study the influence of buried depth on electrical performance of electrodes under typical soil model,and the basic principle of selection of buried depth is proposed.As electrodes of a vertical ground electrode are usually arranged in ellipse,it is found that the maximum step potential often appears near the end of the long axis,and the idea that buried depth of electrodes near the end of the long axis is appropriately increased to improve the cross step electric potential distribution characteristics of grounding electrodes is put forward.Finally,according to the measured data and simulation results of step potential of the vertical grounding electrode in Chang Cui Village,the law of higher step potential near the end of elliptical axes and the way for the improvement of the distribution characteristics of step potential are verified.Conclusions of this paper can be used as a reference for the design of vertical grounding poles.

关 键 词：垂直接地极 电极埋深 椭圆形 跨步电势 长轴端部 

分 类 号：TM862[电气工程—高电压与绝缘技术]