多层土壤中含有不同电阻率块状媒质时的接地网分析

基于矩量法和边界元法，提出一种用于分析含有电阻率分块均匀材料的水平分层土壤中的接地系统性能的数值计算方法。这种方法以导体上的漏电流和有限体积材料表面的电荷密度为待求变量，与国际上其他方法相比，该方法使用的未知量数显著减少，并且可以分析复杂多层土壤中的接地网性能。通过与小接地网上的测试结果进行对比，也验证了文中方法的有效性。应用文中方法对埋在双层土壤中的大型水电站的接地网进行了计算。

ANALYSIS OF GROUNDING SYSTEMS IN MULTI-LAYER SOIL WITH FINITE VOLUMES OF DIFFERENT RESISTIVITIES

Based on the method of moment and the boundary element method, a new method to analyze grounding system buried in multi-layer soil with finite volumes of different resistivities is presented. The method uses leakage currents of all conductor segments and the surface charge densities on the surface of finite volume as unknown variables. The number of unknown variables used in this method is much less than those in other methods, and the grounding system buried in multi-layer soil with arbitrary numbers of layers can be analyzed. Test is also done on a real small grid to validate the method presented. As an application of this method, a grounding system of a large-scale hydropower station buried in two-layer soil is analyzed.