Abstract – One of the main purposes of grounding systems is to safely inject fault currents into the soil; such currents flow through any buried conductive objects (e.g. other earth electrodes) eventually present along their path. As a result, even though grounding systems may be metallically isolated, they become coupled due to the flow of the earth-current and interferences occur. Due to this unwanted coupling, dangerous potentials may arise over the “passive” electrode, which may expose persons to the risk of electric shocks. This paper proposes a semi-analytical approach to evaluate mutual interactions among grounding systems at low frequency, and establishes criteria to evaluate their actual independence. A significant study of interactions between the substation grid and the safety ground bed in a mining installation is quantitatively discussed.
|Titolo:||Interferences Phenomena between separate grounding systems|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||10.1109/TIA.2013.2290840|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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