Influence of the soil on transient grounding resistance under pulsed discharging current

The influences of homogeneous, layered and fractional improved conductivity soil on transient grounding resistance (TGR) under pulsed discharging current are analyzed by using FDTD method in this paper. The results show that the ground conductivity has significant influence on TGR. In homogeneous soil, TGR and the influence of the buried depth of the grounding conductor on TGR decrease with increasing ground conductivity. In layered soil, the grounding conductor should be buried in the high conductivity layered soil, and not near the layered boundary. The locally improved conductivity will decrease TGR,and TGR is sensitive to this locally improved soil volume.And for the locally improved soil where the conductivity is enough large, the farther increasing of the conductivity has little effe