S. Fortin, W. Ruan, and F.P. Dawalibi (Canada)
Power Transmission, Power System Grounding Design, Equipotential Structure
This paper examines three approaches used in grounding analysis and illustrates the advantages, limitations, and the applicability of each approach. The comparisons are carried out using grounding grids of sizes varying from 50 m to 500 m, in uniform and two-layer horizontally layered soil structures. Soil resistivities vary from 1 Ohm m to 10,000 Ohm-m. The errors in GPR (Ground Potential Rise) and touch voltages, as well as computation time, are compared between the three approaches. The discussions and conclusions given in this paper can be used as a reference when deciding which approach should be used to carry out an accurate and efficient grounding analysis.
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