THE RESPONSE GROUNDING ELECTRODES TO LIGHTNING CURRENTS: THE EFFECT OF FREQUENCY-DEPENDENT RESISTIVITY AND PERMITTIVITY OF SOIL

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作者
Visacro, Silverio [1 ]
Murta Vale, M. H. [1 ]
Guimaraes N, Miguel B. [1 ]
Araujo, Roger A. [1 ]
Pinto, Wyllian L. F. [1 ]
Alipio, Rafael S. [1 ]
机构
[1] Univ Fed Minas Gerais, LRC, Av Antonio Carlos 6-627 Pampulha, BR-31270901 Belo Horizonte, MG, Brazil
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中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A methodology to find the variation of soil resistivity. and permittivity. in field conditions at the typical range of lightning-current frequencies was proposed and applied in low-and high-resistivity soils. Considering this variation in simulations using the hybrid electromagnetic model HEM was able to practically match results of theoretical and experimental voltage waves developed in response to the impression of impulsive currents with lightning-pattern waveforms to horizontal grounding electrodes buried in the analyzed soils, different from the results obtained with the conventional approach of constant values for rho and epsilon.
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