Influence of Outside Environment on Transient Grounding Resistance under Pulsed Discharging Current

Abstract

This paper analyzes the influence of outside environment of the grounding conductor, including the interference source and the ground, on transient grounding resistance (TGR) under pulsed discharging current by using FDTD method. The results show that (1) TGR has bigger peak value and longer steady time when fast rising edge interference pulse acting on the grounding conductor than slow rising edge interference pulse; (2) when the layered soil is met, the grounding conductor should be buried in the soil which has bigger conductivity and not be in the neighboring of the layered boundary; (3) the locally improved soil has remarkable effect on the decrease of TGR, especially the expansion of the range of locally improved soil, but the influence of that on TGR is stepping down along the farther increasing of its conductivity when its range is fixed.