非均匀土壤矩形接地网优化设计

摘要

When the soil environment around the grid is determined,the optimal design of grounding grid is equalized the potential,so as to reduce the touch voltage and step voltage,and as far as possible to save materials,reduce the cost of construction.In order to get the optimal layout scheme of rectangular grounding grid under the condition of non-uniform soil,based on the simulation models of square grounding grid built by CDEGS,firstly,the optimal design of grounding grid is obtained by changing each equalizing belts,and optimization function is obtained from fitting function.The change of the optimization function in different soil reflection coefficients,soil thickness and the area of the grounding grid is studied,and the effect of the rectangular grounding grid is analyzed.The research shows that the design of the grounding grid is related to the soil environment,but also with the rectangular shape.Compare with other methods,this proposed method can reduce maximum touch voltage about 12％.This method can be applied to uniform and non-uniform soil,which can optimize the rectangular and square grounding grids,and the optimization effect is in accordance with the basic standards of the power industry.%当接地网周围土壤环境一定,使用最优的均压带布置方案可以有效均匀接地网地表表面的电位,进而降低接触电压和跨步电压,并且尽可能的节约材料,降低建设成本.为了得到适用于非均匀土壤环境下,矩形的接地网最优布置方案,基于CDEGS建模,首先移动各个均压带,得到优化后均压带的位置,通过函数拟合得出优化函数.进一步研究了优化函数在不同的土壤反射系数、上层土壤厚度和接地网面积等因素对优化系数的影响,最后,将拟合函数应用到非均匀土壤下矩形接地网的优化中.通过和其他方法的计算对比得出,利用文中计算方法优化的接地网,最大接触电压降低12％左右.采用文中提出的方法,既适用于均匀和非均匀土壤,又可以优化矩形和方形接地网,且优化效果满足电力行业的基本标准.