Abstract
Grounding of power substations is to provide safety for personnel during normal and fault-to-ground conditions by limiting step and touch potentials, to dissipate lightning strokes and to stabilise voltage during transient conditions. One important goal of this study is to present simplified approaches for the earth surface potentials and ground potential rise (GPR) of substation grounding in case of uniform and non-uniform soils. The equalisation of the current density and then decreasing of GPR is achieved. The Infinite Series Potential Method is used to calculate the GPR and the earth surface potentials with accurate results for the grids buried in uniform and non-uniform soil structures. The voltage profiles have been designed in three-dimensional to make the selection of suitable earthing system easier. An experimental model is used for the verification of the obtained results.
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