A methodology for determining the maximum touch voltage in the grounding grids considering the impulse resistance

The flow of the lightning current through the grounding grids of electrical substations produces impulse processes in the soil. The authors have developed a simulation model of the grounding, considering the wave processes. To expand the model, determination of the maximum possible touch voltage in these processes have to be done. This report proposes a mathematical model, describing the dependence of the maximum touch voltage in the center of the corner cell (according to Std IEEE 80-2000 - “corner mesh”) of the grounding system under the effect of impulse processes in the soil.