In a previously published work, performances of three practical earthing systems consists of 2, 3 and 4 rod-bed electrodes buried at the same site, thus the same soil resistivity were investigated. It was found that the degree of reduction of the earth resistance values is the highest in the poor earthing systems (2 rod electrodes). The non-linearity effect or the reduction of earth resistance values as the currents were increased was also observed in previous study. However, in that study, the effects of the soil resistivity on the performance of earthing systems were not observed. This paper is a continuation of previously published paper where the detailed investigations of the soil ionisation in earthing systems under high impulse conditions for different soil resistivity values are presented. Similar configurations of earthing systems of 2, 3 and 4 rod-bed as in were used in each site, and combined grid-multiple rods where the results have been presented before were used for the purpose of comparison.
Electrical Engineering (Archiv fur Elektrotechnik) – Springer Journals
Published: Nov 5, 2016
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