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This paper aims at contributing to the study of grounding systems behavior due to direct lightning currents striking rural distribution lines located in high flash density areas. The high current density, from direct flashes, causes soil ionization phenomenon in grounding systems. In order to investigate the ionization phenomenon under various grounding conditions, impulse tests were performed on...
This paper discusses the influence of the moisture content on the seasonal behavior of both soil resistivity and ground resistance typical of power distribution grounding systems. Although field surveys indicate a wide variation in the moisture content only for the topmost soil layer, laboratory tests show that the resistivities of several types of soil are greatly affected. As a consequence, the...
This paper discusses the influence of the moisture content on the seasonal behavior of soil resistivity and on the ground resistance of protection systems. Laboratory tests show that this influence is very large on the resistivity of several types of soil, although field researches indicate a wide variation in the resistivity and moisture content only in the topmost layers of the soil. However, this...
This paper presents an analysis of the behavior of concrete pole bases under lightning impulse currents and their application as a grounding topology for overhead power distribution lines. For this purpose, the Transmission-Line Modeling Method (TLM) has been used to simulate the transient grounding impedance curve. An analytical expression has been developed to compute the ground resistance and a...
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