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S. Visacro and C. M. Portela, “Soil Permittivity and Conductivity Behavior on Frequency Range of Transient Phenomena in Electric Power Systems,” Proceedings of Symposium High Voltage Engineering, Braunschweig, 24-28 August 1987, pp. 107-112.

has been cited by the following article:

• TITLE: Computer Analysis of Electromagnetic Transients in Grounding Systems Considering Variation of Soil Parameters with Frequency

  AUTHORS: Marco A. O. Schroeder, Márcio M. Afonso, Tarcísio A. S. Oliveira, Sandro C. Assis

  KEYWORDS: Grounding Electrodes; Grounding Impedance; Transient Response; Frequency Response; Electromagnetic Modeling

  JOURNAL NAME: Journal of Electromagnetic Analysis and Applications, Vol.4 No.12, December 26, 2012

  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.