接地网接地电阻的优化算法

基于对称复镜象法提出了一种模拟计算接地网接地电阻的优化算法。对称复镜象法是一种适用于非均匀土壤中任意结构接地网接地参数精确计算的新方法。对于多层媒质模型,利用对称复镜象法计算接地电阻时,需要假定总的泄漏电流,由此得到每个单元的泄漏电流和地网电位升,进而得到地网接地电阻。本文对此进行了较简便的优化,不必假设总的泄漏电流,而是通过矩阵变换直接求出接地电阻,从而大大提高了计算精度和计算时间。文中给出了两层大地模型中接地网接地电阻的优化算法并给出了任意放置的两导体间互阻的解析计算公式,且应用所介绍的方法分析计算了实际接地网系统,得到了满意的结果。

OPTIMIZED ALGORITHM OF THE RESISTANCE

Based on the complex image method, an approach for simulating the grounding systems of substations is introduced in this paper. The symmetry complex image method is recently used to calculate accurate grounding parameter of grounding systems with any form in non- homogeneous soil. But when symmetry complex image method is applied in the calculation of grounding grids resis- tance, it is to first calculate the total fault current of the grid and then obtain the fault current of every element and achieve the grid resistance .This paper approaches the algorithm of it. It is unnecessary to calculate the element fault current, but through alternating the resistance coefficient matrix directly to acquire the resistance of ground grids. As a result, the computing time and precision can be improved. The corresponding improved method is given. A software for simulating the grounding systems has been developed.