The simulation research on the impulse characteristics of the grounding electrode in the layered soil

The research on the impulse characteristics of the grounding electrode is basically proceed in the soil with single uniform resistivity, but the composition of the tower´s grounding system is always with several layers. It is contributed to the judgment of the computation and experiment result by clarifying the difference of two kinds of the impulse characteristics. The simulation experiments of the grounding electrode´s impulse characteristics need to be proceeded on the soil with different resistivity. The soil in the simulation experiments need to be replaced many times. It will spend plenty of manpower, material resources and time to replace the whole soil in the simulation area with great size. The article presents a scheme of partial replacement of the soil with only changing the soil of peripheral region of the electrode. The simulation area with the scheme of partial replacement of the soil is a pattern with double-layer. The article has a simulation study on the impulse characteristics of single and double-layer´s soil pattern via modeling. The result shows that with the increase of the up layer´s soil area, the impulse characteristics of the double-layer´s soil pattern have an approaching relationship to the single soil pattern. The paper indicates that the scheme of partial replacement of the soil when having the impulse experiment is feasible and obtains the best scheme.