Transient response of grounding electrodes for the frequency-dependence of soil parameters

This study evaluates the response of a horizontal grounding electrode against impulsive currents whose waveforms and time front is typical of lightning. The electrode is found buried in soil with different resistivity values and whose conductivity and permittivity vary with spectrum frequency of lig...

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Published in2010 IEEE/PES Transmission and Distribution Conference and Exposition: Latin America (T&D-LA) pp. 839 - 845
Main Authors Pedrosa, A G, Shroeder, Marco Aurélio O, Afonso, Márcio M, Alípio, Rafael S, de Castro Assis, Sandro, Oliveira, Tarcísio A S, Braga, Anísio R
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2010
Subjects
Conductivity
Electrodes
electromagnetic transients
frequency dependence
Grounding
grounding model
Impedance
Lightning
Permittivity
Soil
Variation of conductivity and permittivity of soils
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Summary:This study evaluates the response of a horizontal grounding electrode against impulsive currents whose waveforms and time front is typical of lightning. The electrode is found buried in soil with different resistivity values and whose conductivity and permittivity vary with spectrum frequency of lightning according four formulations exists in literature. It was possible to observe the intense propagation effects responsible for the grounding impedance values significantly different from the resistance at low frequency and also difference according to each formulation, which has decreased the potential, the impedance impulsive and impulsive coefficient compared to traditional data from the technical literature specialist.
DOI:10.1109/TDC-LA.2010.5762982