Medição e análise da condutividade e permissividade elétricas no domínio da frequência em solo mediante aplicação de correntes senoidais.

Abstract

The knowledge of the electrical characteristics of the soil is extremely important for the analysis of soil behavior, as well as for the design of low and high frequency grounding systems. In this sense, the problem issue that guided this study is: what is the behavior of conductivity and permittivity in soil samples when sine wave electric currents are applied at different frequencies? The results show a change in soil behavior from the frequency variation, since at low frequencies the conductivity (σ) and soil permittivity (ε) parameters remain constant, however, as the frequency increases, there is also an increase in such parameters. It was verified that in the majority of the applications of electrical grounding does not take into consideration the parameters of the conductivity and the permissivity, since it is understood that the soil behavior is purely resistive. Such knowledge is valid only for low frequencies, because the conductivity value is much greater than the permissivity. At high frequencies, however, the conductivity and the permissivity must be considered, since they are substantially frequency dependent.