Effect of Ground Rods Position on Current Distribution in Ground Grid under Transient Current

This paper examines current distribution in a buried ground grid under variable frequency and impulse currents, highlighting the significant importance of current injection points and the effect of ground rod positioning. Experimental results on impulse studies are considered, followed by CDEGS simulations to discuss the findings. For grids without rods, the results show that localized soil conditions impact current dissipation, affecting earth potential rise during lightning strikes. While corner-connected vertical rods contribute to current dissipation, their effectiveness diminishes when placed farther from the injection point, raising questions about their practical application for improved transient performance. Additionally, the selection of ground rod positions has a significant effect on current distribution in the grid branches, especially under high-frequency and transient conditions.