外引接地网对高速铁路牵引变电所降阻效果研究  

A Study on the Effect of External Grounding Grid on Resistance Reduction of Traction Substation of High-speed Railway

作　　者：甘琪海 GAN Qihai(China Railway Nanning Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]中国铁路南宁局集团有限公司,南宁530029

出　　处：《高速铁路技术》2022年第6期41-45,共5页High Speed Railway Technology

摘　　要：本文针对某牵引变电所接地电阻过高的问题,开展了外引接地网降阻方案研究,采用土壤电阻率勘察确定了接地网布置位置,分析了外引接地网形状、网孔数量和垂直接地极位置等因素对接地网的接地电阻的影响。研究结果表明:(1)狭长形的水平外引接地网具有更好的降阻效果;当接地网面积不变,长宽比从2.5增加到40时,接地电阻将下降到原来的1/3;(2)垂直接地极的位置对降阻效果的影响非常大;当将5个垂直接地极按间距为40 m布置在一条直线上时,接地电阻多下降21.8%;(3)接地改造前进行细致的土壤电阻率勘察和降阻方案仿真分析可极大地节省工程投入,本文研究成果可为变电所接地网改造提供参考。In view of the high grounding resistance of a traction substation,this paper studies the resistance reduction scheme of the external grounding grid,determines the layout position of the grounding grid by soil resistivity survey,and analyzes the impact of factors such as the shape of the external grounding grid,the number of meshes and the position of vertical grounding electrodes on the grounding resistance of the grounding grid. The results show that:(1)The long and narrow horizontal external grounding grid has a better resistance reduction effect. When the area of the grounding grid remains unchanged and the length-width ratio increases from 2. 5 to 40,the grounding resistance will decrease to 1/3 of the original value.(2)The position of the vertical grounding electrode has a significant impact on the resistance reduction effect. When 5 vertical grounding electrodes are arranged on a straight line at an interval of 40 m,the grounding resistance will be reduced by 21. 8%.(3)Detailed soil resistivity survey and simulation analysis of the resistance reduction scheme before the modification of the grounding system can greatly save engineering investment. The research results in this paper can provide a reference for the modification of the grounding grid in substations.

关 键 词：牵引变电所 接地网 外引接地网 接地电阻 垂直接地体 

分 类 号：U244[交通运输工程—道路与铁道工程]