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Computer Analysis of Electromagnetic Transients in Grounding Systems Considering Variation of Soil Parameters with Frequency
Department of Electrical Engineering, Federal University of S?o Jo?o del-Rei, Laboratory of Applied Electromagnetism, S?o Jo?o del-Rei, Brazil
Department of Electrical Engineering, Federal Center of Technological Education of Minas Gerais, Belo Horizonte, Brazil; 3Energetic Company of Minas Gerais, Belo Horizonte, Brazil
Department of Electrical Engineering, Federal Center of Technological Education of Minas Gerais, Belo Horizonte, Brazil
Energetic Company of Minas Gerais, Belo Horizonte, Brazil.
- 1 Department of Electrical Engineering, Federal University of S?o Jo?o del-Rei, Laboratory of Applied Electromagnetism, S?o Jo?o del-Rei, Brazil
- 2 Department of Electrical Engineering, Federal Center of Technological Education of Minas Gerais, Belo Horizonte, Brazil; 3Energetic Company of Minas Gerais, Belo Horizonte, Brazil
- 3 Department of Electrical Engineering, Federal Center of Technological Education of Minas Gerais, Belo Horizonte, Brazil
- 4 Energetic Company of Minas Gerais, Belo Horizonte, Brazil.
Journal of Electromagnetic Analysis and Applications·Volume 04 (2012)·Pages 475–480·Published 26 December 2012·DOI10.4236/jemaa.2012.412066
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Abstract
This paper presents a mathematical model to calculate transients in grounding systems. The derived equations arise from direct application of basic electromagnetic equations in frequency domain, whose solution is obtained by the application of the Moment Methods. A formulation based on experimental measurements is applied to quantify the soil parameters for each frequency. The unified approach is applied in the calculation of the grounding impedance of horizontal electrodes. Results show that the inclusion of frequency dependence of the soil parameters leads to a reduction of the values of grounding impedance, in comparison with results for soils with parameters independent of frequency.
KeywordsGrounding ElectrodesGrounding ImpedanceTransient ResponseFrequency ResponseElectromagnetic Modeling
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