Analysis of Differences in Apparent Resistivity Between Soil Model Considering Heterogeneous Region and Traditional Soil Model

At present, most soil models used in grounding design do not consider the existence of heterogeneous region. However, local heterogeneous modules with high or low resistance will greatly affect the soil model under certain conditions, and these heterogeneous regions cannot be ignored at this time. In this paper, the necessity of soil model considering heterogeneous region is demonstrated through simulating calculation in CDEGS. Firstly, a complex soil model considering heterogeneous region is introduced and simplified reasonably. Then the method of comparing the error of apparent resistivity between soil model considering heterogeneous region and traditional soil model by CDEGS is illustrated. Finally, a case study was conducted to compare the homogeneous soil model and stratified soil model with the one proposed in this paper, further verifying the necessity of soil model considering heterogeneous region under certain conditions.