doiSerbia

Contribution to calculating the impedance of grounding electrodes using circuit equivalents

Kuhar Andrijana (Ss. Cyril and Methodius University, FEIT, Skopje, Macedonia)
Grcev Leonid (Ss. Cyril and Methodius University, FEIT, Skopje, Macedonia)

In this paper the dynamic behavior of grounding electrodes is investigated by calculating their impedance to ground. The calculations are performed by implementing popular modelling approaches including circuit, transmission line, and electromagnetic field (EMF) model. The attention of this paper is given to the circuit based (CBM) method. The results from the rigorous EMF model are used as reference in the process of validity range determination of the other models. Numerically obtained curves for the frequency-dependent impedance to ground are presented in several figures for various electrode lengths and soil characteristics.

Keywords: equivalent circuits, EMF model, grounding electrode, impedance