高密度电法在变电所接地工程中的应用

Application of High Density Resistivity Method in Substation Grounding engineering

介绍了高密度电法的测量原理、系统组成和特点。在220kV芦江变电所接地改造工程中,利用CDEGS接地分析软件,分别基于高密度电法测量所得分层土壤模型和四极法测量所得均匀土壤模型,对芦江变接地改造前后接地网的接地电阻进行仿真计算。计算结果表明,基于高密度电法得到的分层土壤模型仿真计算值与实测值非常接近,而基于四极法的均匀土壤模型仿真计算值与实测值相差较大,验证了高密度电法测量得到的分层土壤模型的准确性。

This paper introduces the measuring principle, components and characteristics of high density resistivity method. In the grounding reconstruction project of 220 kV Lujiang substation, using CDEGS grounding analysis software ,based on layered soil model from high density resistivity method and uniform soil model from four-probe method, the ground resistance before and after the reconstruction of Lujiang substation is simulated. The simulation result shows that the simulated ＆ calculated value based on layered soil model from high density resistivity method is very close to measured value, but the simulated ＆ calculated value based on uniform soil model from four-probe method has large difference with measured value, and the result has verified the accuracy of the layered soil model from high density resistivity method.