Análise do comportamento dos parâmetros elétricos do solo quando submetido a impulsos de tensão.

Abstract

The electrical parameters of the soil (conductivity and electrical permissiveness) directly influence the performance of grounding grids, especially in transient situations caused by the incidence of atmospheric discharges. In literature, such parameters are generally independent of frequency, with constant conductivity (σ), and permissiveness (ε) that can be neglected, however, in the presence of rapid transient impulsive character phenomena, presents a singular behavior, varying in a frequency scale present in these signs. Therefore, it becomes necessary to study the state of the soil in these situations. In this work is made an analysis of the conductivity and electrical permissiveness behavior of the soil subjected to voltage pulses, and it is presented a methodology that shows a system for testing the electrical parameters of the soil specially developed for this purpose.