How the frequency dependence of soil parameters affects the lightning response of grounding electrodes

• Published in: 2012 International Conference on Lightning Protection (ICLP) pp. 1 - 4
• Main Authors: Alipio, R., Visacro, S.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-09-2012
• Subjects: frequency dependence of soil; Grounding; Harmonic analysis; lightning response of grounding electrodes; Soil; soil permittivity; soil resistivity
• ISBN: 9781467318983; 1467318981
• DOI: 10.1109/ICLP.2012.6344354

Quantities related to the response of grounding electrodes subject to lightning currents are simulated under the assumption of constant and frequency dependent soil resistivity and permittivity, considering low- and high-resistivity soils. It was found that the frequency dependence of soil parameters is responsible for decreasing the grounding potential rise of electrodes and, thus, their impulse impedance and their impulse coefficient. This effect is more pronounced for high-resistivity soils and typical currents of subsequent strokes.