Determination of the mutual ground resistance of adjacent grounding grids

Abstract

The article deals with the problem of determining the mutual grounding resistance of two close, metallically connected grounding electrodes. For this purpose, an original analytical expression was derived for calculating the corresponding mutual grounding resistance between close grounding electrodes. Namely, in close grounding electrodes, a complex electromagnetic coupling is present between them. The conductive component of this coupling is particularly strongly expressed. In the case of a ground short circuit, it affects the increase of the total grounding resistance of the associated grounding system. Knowledge of the aforementioned mutual grounding resistance is otherwise essential for the correct determination of the distribution of partial ground short circuit currents in a system of close grounding electrodes. The considered problem of determining the mutual grounding resistance is illustrated by the example of two specific mesh grounding electrodes buried in poorly conductive soil.

Petar Sarajčev

Full Professor | Department of Power Grids and Substations

Slavko Vujević

Professor Emeritus

An expert in electrical engineering, particularly known for his contributions to numerical modeling of electromagnetic phenomena, lightning protection, and grounding. Throughout his career, he was a key member of the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, where he taught, mentored students, and actively participated in scientific research and international professional organizations.