变电站接地网模拟计算

NUMERICAL CALCULATION OF SUBSTATION GROUNDING SYSTEMS

基于复镜象法提出了一种模拟计算变电站接地网的方法，该方法适用于多层大地模型中任意结构接地网的模拟。对于多层媒质模型，若利用经典镜象法求解，则需要设置无穷多个镜象来模拟边界及分层特性；而利用复镜象法，则只需几个镜象即可。复镜象法中镜象的大小和位置一般为复数。复镜象法的计算效率和计算精度远远高于经典镜象法。文中给出了多层大地模型中复镜象法的格林函数和接地网的数值计算技术。基于所介绍的方法开发了变电站接地系统模拟计算软件，并应用该软件分析计算了几种实际接地网系统，得到了满意的结果。

The complex image method only needs a few images to simulate electromagnetic fields in multiple layer media, while the classic image method needs infinite ones in this situation. Based on the complex image method, an approach for simulating the grounding systems of substations is introduced in this paper. The electrodes of the systems with grids and driven rods can be located anywhere in multiple layer earth models. The corresponding Green's functions are given, and numerical techniques are described. A software for simulating the grounding systems has been developed.