Behavior of a grounding grid when subjected to power-frequency fault currents is well studied and probably well understood. However, the behavior of the ground-grid when subjected to transient or lightning currents is different when compared to power frequency currents. The objective of this paper is to provide a better understanding of the behavior of a ground-grid when excited by transient voltages and currents. The Finite Element Method (FEM) is used to solve Maxwell’s equations when modeling the grounding behavior under lightning current. In this study, step voltages above the ground are evaluated for different scenario. Effect of soil resistivity and grid size were analysed. Comparison with the safety limit, as proposed by previous researchers, is shown in the results.
|Number of pages||4|
|Publication status||Published - 20 Jun 2015|
|Event||2015 Asia-Pacific International Conference on Lightning - Aichi, Nagoya, Japan|
Duration: 23 Jun 2015 → 26 Jun 2015
|Conference||2015 Asia-Pacific International Conference on Lightning|
|Period||23/06/15 → 26/06/15|
- grounding modeling
- finite element method (FEM)
- step voltage
Hanaffi, F., Siew, W. H., & Timoshkin, I. (2015). Step voltages in a ground-grid arising from lightning current. Paper presented at 2015 Asia-Pacific International Conference on Lightning, Nagoya, Japan.