Abstract
The effect of an oxide layer or any conductive material layer surrounding the electrode surface on the performance of grounding system is studied in this paper. The boundary elements method applied to the electrode surface together with the Equivalent Surface Charge Distribution model to assess the contribution of the material-soil interface are used to compute the grounding resistance of an electrode buried in a semi-infinite soil and energized by a low frequency current. Due to the high computation time required to apply the numerical method to find the solution of the problem, the Coated Electrode Equivalent Radius is introduced from the study of the grounding resistance as a tool to simulate the effect of the material layer on the electrode. This equivalent radius is a function of the thickness of the material layer and can be used in common methods for calculating parameters of a grounding system such as grounding resistance and step and touch potentials. The proposed expression for the equivalent radius is tested in several synthetic examples and also in a real case. Some of the tests carried out are also compared with the results of using commercial software.
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