Theoretical analysis of grounding resistance for the rod buried into the multilayered earth

The theoretical analysis has already been performed for the cylindrical rod electrode that is driven vertically into the earth with its upper end at the earth surface. However, there is almost no report to describe the grounding resistance when the rod is buried into the multi-layered earth. It is important to understand how changing various buried depth for electrodes affects the potential distribution and the grounding resistance. In this paper, the electric potential distribution in the underground and the voltage along the earth surface for the buried rod with buried depth t into the multi-layered earth are analyzed. Based on the results, the authors proposed a calculating equation of the grounding resistance for the rod buried into the multi-layered earth. The validity of those estimated values for the buried rod is verified with the numerical calculation.