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Electric fields of grounding electrodes with frequency dependent soil parameters |
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| Authors: | RS Alipio MM Afonso |
| Affiliation: | a Dept. of Electrical Engineering, Federal Center of Technological Education of Minas Gerais, Amazonas Avenue, 7675, Nova Gameleira, Belo Horizonte, Minas Gerais, Post Code: 30510-000, Brazil b Dept. of Electrical Engineering, Federal University of São João del-Rei, Frei Orlando Square, 170, Centro, São João del-Rei, Minas Gerais, Post Code: 36307-352, Brazil c Energetic Company of Minas Gerais, Management of Expansion Substations and Distribution Lines, Barbacena Avenue, 1200, 16°/B2, Santo Agostinho, Belo Horizonte, Minas Gerais, Post Code: 30190-131, Brazil |
| Abstract: | The profile of the electric field developed at the ground level above a horizontal grounding electrode due to the impression to the electrode of waves resembling lightning currents of first and subsequent strokes was calculated using an electromagnetic model. The simulation considered both assumptions constant values for soil parameters resistivity and permittivity and frequency dependent values. This dependence was given by an expression derived from field measurements. It was found that the frequency dependence of soil parameters is relevant, mainly at low conductivity soils and short front-time current waves, leading to a significant decrease of the electric field profile. |
| Keywords: | Electric fields Grounding electrodes Lightning Soil measurements |
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