水平分层土壤中矩形混凝土任意形状复合接地网电阻的计算  

The Calculation of Ground Resistance for a Rectangular Concrete Complex Ground Grid with Random Shape in Horizontal Layer Soil

作　　者：胡登宇[1] 汤放奇[1] 龚玉兰[1] 何燕娇[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410077

出　　处：《长沙电力学院学报（自然科学版）》2005年第1期1-5,共5页JOurnal of Changsha University of electric Power:Natural Science

基　　金：湖南省自然科学基金资助项目(01JJY3024);湖南省教委科研资助项目(00C253)

摘　　要：对水平分层的多层土壤,先使用等效电阻率的方法,将水平多层土等效为二层土壤,然后对矩形混凝土内任意形状的复合接地网的接地电阻,提出2种处理方法,第1种方法是建立分界面上的积分方程,然后用矩量法离散,并用有限面积来代替二层土壤无限大分界面进行求解.第2种方法是用无穷多个镜像代替二层土壤的作用,将二层土壤中的基础接地问题化为均匀土壤中的基础接地问题进行求解.应用静电场和恒定电流场的相似性,论述了第1种方法的实现过程,包括积分方程的建立,矩量法离散,奇点的处理,以及离散后的代数方程式等.编制了能计算矩形混凝土内任意形状复合地网接地电阻的程序,用文献[1,2]的计算结果,检验了方法的正确性.The horizontal multilayer soil is first equivalently divided into two-layer soil by means of equivalent resistivity , the calculation is then made in two approaches to get the ground resistance in the complex ground grid with random form for the rectangular concrete multi layer soil. The first approach is to set up an integral equation on boundaries and to adopt the moment method replacing the limitless boundary surface in two-layer soil with limited areas to find a solution .The second approach is to use limitless infinite mirror images to replace the function of two-layers soil to seek a solution to the foundation grounding question of two-layers soil.The authors also discuss, in the light of the similarity between the electrostatic field and the steady-state current field, the realization of the first approach including the integral equation, division of moment method, singularity treatment and establishment of algebraic equations after division. The computer programs have been worked out to calculate the earth resistance in complex grounding grid with random form for a rectangle concrete.The calculation results of documents[1,2]show the correctness of this method.

关 键 词：矩量法 基础接地 接地电阻 两层土壤 

分 类 号：TM862[电气工程—高电压与绝缘技术]