Abstract
In many publications, the characteristics of practical earthing systems were investigated under conditions involving fast-impulse currents of different magnitudes by field measurements. However, as generally known, in practice the transient current can normally reach several tens of kiloamperes. This paper therefore aimed to investigate the characteristics of a new electrode for grounding systems under high current magnitude conditions, and compare it with steady-state test results. The earth electrodes were installed in low resistivity test media, so that high impulse current magnitudes can be achieved. The effects of impulse polarity and earth electrode’s geometry of a new earth electrode were also quantified under high impulse conditions, at high currents (up to 16 kA).
Highlights
Much work [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18] has been carried out to characterize practical earthing systems under fast-impulse, high-magnitude current conditions
Experiments were performed on different grounding configurations using various configurations at installed in low resistivity profile soils at the same field site
The characteristics of various configurations were investigated under lower current magnitudes, below 2 kA
Summary
Much work [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18] has been carried out to characterize practical earthing systems under fast-impulse, high-magnitude current conditions. There have been a lot more impulse tests [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18], were carried out on practical earthing systems, where tit was found that the ‘impulse resistance’ values were found to be less than those measured for low voltage, low frequency currents [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]. It was found that the impulse resistance becomes less current dependent in high currents
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