Abstract
This paper analyzes the effect of the integration path of the electric field on the grounding impedance measurements. It is shown that the integration path is not relevant for low frequencies, as the value yielded by the field integration is close to the one provided by the difference of scalar potential between the electrode and a remote ground. However, the integration path becomes significant for high frequencies, due to the presence of non-conservative electric fields. It is considered a typical transmission line grounding for the example and it is shown that significant differences appear for frequencies beyond a given critical frequency value. It is also shown that there are other issues affecting the grounding measurement at high frequency, such as the electrode effective length and the propagation effects on the measuring wires. Finally, the paper discusses the possibilities for defining the high-frequency grounding impedance.
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