Computation of ground potential rise and grounding impedance of simple arrangement of electrodes buried in frequency-dependent stratified soil

Justo de Araújo, Anderson R., Colqui, Jaimis S.L., de Seixas, Claudiner M., Kurokawa, Sérgio, Salarieh, Bamdad, Pissolato Filho, José and Kordi, Behzad 2021. Computation of ground potential rise and grounding impedance of simple arrangement of electrodes buried in frequency-dependent stratified soil. Electric Power Systems Research 198 , 107364. 10.1016/j.epsr.2021.107364

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Abstract

Grounding electrodes are used to provide a low-impedance dissipation path for the excess lightning or fault currents. Several studies have been dedicated to the computation of the grounding impedance of different electrode arrangements considering either the frequency dependence of soil parameters (resistivity and relative permittivity) or the multi-layer nature of soil. This paper aims at the calculation of the grounding impedance and the ground potential rise (GPR) of simple electrode arrangements (vertical and cross electrodes) due to the injection of first and subsequent lightning currents in various configurations of soil, considering a frequency-dependent stratified soil. A frequency-domain full-wave electromagnetic solver based on the Method of Moment (MoM) that employs a stratified medium Green’s function is used to compute the grounding impedance in a frequency range of 100 HZ to 10 MHz. The transient GPRs are computed using the equivalent circuit of the grounding system, obtained through the application of the Vector Fitting (VF) technique and recursive convolution method. The simulation results show that considering the frequency dependence of the soil parameters has no effect on the low-frequency grounding impedance up to =10 kHz. However, the frequency dependence of soil parameters leads to a considerable variation of the grounding impedance at higher frequencies especially for soils of higher resistivity. Furthermore, it is shown that considering the layers of soil has a more significant impact on the GPR of the vertical electrode than that of the cross electrode.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0378-7796
Date of Acceptance:	6 May 2021
Last Modified:	14 Mar 2024 15:00
URI:	https://orca.cardiff.ac.uk/id/eprint/166479

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