均匀土壤中矩形接地网的优化方法  

Optimization Method to Rectangular Grounding Grid in Uniform Soil

作　　者：曹晓斌[1] 胡劲松[2] 吴广宁[1] 黄晓明 李瑞芳[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031 [2]中国电力工程顾问集团公司,北京100120 [3]西南电力设计院,成都610021

出　　处：《高电压技术》2012年第10期2721-2727,共7页High Voltage Engineering

基　　金：铁道部重大专项课题(2011T008);教育部中央高校基本科研业务费专项资金(SWJTU11CX035)~~

摘　　要：地网接地导体非均匀布置可以在保证人员与设备安全的前提下,尽可能地节约金属材料。为了得到均匀土壤中地网的优化设计公式,找出均匀土壤中矩形地网的优化设计方法,基于CDEGS的地网模型,仿真得到了优化后接地导体的位置,通过变量替换研究了导体位置与编号之间的对应关系,并仿真分析了矩形地网优化效果。研究发现接地导体的编号与其位置服从某一确定的函数关系,该函数与导体的数量无关,只有两邻边导体分段数的比值最接近边长的比例时,接触电压与跨步电压才能达到最优效果。最后,给出了地网优化的数学公式及矩形地网的优化方法,该方法可以应用于平行的导体数量>20的地网,优化后跨步电压和接触电压均能满足电力行业标准DL/T 621-1997的要求。With the premise of ensuring the safety of equipment and people,the unequally spacing of grounding grid can economize metal material.We established an optimization formula for designing grounding grid in uniform soil and find out an optimization method to design rectangular grounding grid.Based on the simulation models of square grounding grid built by CDEGS,optimal location of each conductor was gained.The relationship between the number and the location of each conductor was analyzed by variable substitution method.Moreover,the optimizing effect of the unequally spacing on rectangular grounding grids was also investigated.It is concluded that there is a functional relationship between the number and the space not relating to the quantity of the conductor.It is also concluded that the touch voltage and step-voltage is affected by the divided quantity of the adjacent side of rectangle.Finally,a new optimization formula is derived,and a new optimization method for rectangular ground grid in uniform soil is presented.The optimization method works when the quantity of parallel conductors is more than 20,and the touch-voltage and step-voltage of grounding grid optimized by this method both fulfill the requirements of STD DL/T 621-1997.

关 键 词：接地网 不等间距布置 接地导体 均匀土壤 优化方法 变电站 

分 类 号：TM862[电气工程—高电压与绝缘技术]