The grounding grid is the basis for maintaining the safe operation of the power system. Proving the health status of the grounding grid under the soil is the top priority of the maintenance of the power system. When the grounding grid is corroded and fractured, its topology will also change accordingly.In this paper, CDEGS was used for modeling, spectral impedance data of ground grid under different topologies were obtained by spectral method, spectral impedance characteristics of various topologies were analyzed, and the changes of spectral impedance characteristics under different geological conditions were studied by changing soil resistivity. Based on the spectral impedance data obtained from the simulation results, the topological structure of the grounding network in the tested area under the soil is analyzed. This research can further reduce the cost of grounding network status detection and promote social development.

grounding grid; topology structure; spectrum analysis