Summary
This article presents a study investigating the effects of soil ionization on the resistivity of homogeneous and heterogeneous soils surrounding grounding electrodes in substations, and consequently, the effect of soil ionization on the impedance of the grounding network and the ground potential rise. The study also addresses the critical electric field strength surrounding the electrodes. The paper examines the behaviour of grounding electrodes affected by lightning strikes, taking soil ionization into account. In the model proposed for this study, each heterogeneous soil layer has its own frequency-dependent electrical parameters. The results are supported by the most recent published articles to ensure their validity. The current study concluded that as soil resistivity increases and lightning wave frequency decreases, the effective radius of the electrode increases. The rate of increase in the impulse impedance was shown to depend on soil resistivity, reflectance coefficient, and the electrode configuration.
Read more Read lessThe effect of the top-soil layer on the behaviour of the grounding electrode was also examined. The calculated results were confirmed by comparison with measurements performed by other researchers. Finally, the findings of this article may be useful to those involved in the design and maintenance of substation grounding systems.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B3_10164_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Egypt |
| Study committees | |
| File size | 890 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
GOUDA Ossama - Cairo University; ELDEIN Azeinm - Aswan University; YASSIN Sara - Upper Egypt Electricity Company; ELMORSHEDY Ahdab - Cairo University
