Potential Rise Characteristics of a Grounding Grid Subjected to Lightning Currents

다국어 초록 (Multilingual Abstract)

This paper presents the results of an investigation into the factors that affect the impulse response of a grounding grid under the passage of lightning currents. We carried out simulations of potential rise of a 10m×10m square grounding grid comprising 4 meshes buried in the soil of about 140Ω․m resistivity. The potential rise profiles of the grounding grid stressed by lightning currents were computed by EMTP software. The dissipation current and the potential rise for the 0.25/100μs current wave were significantly concentrated around the current injection point. The impulse coefficient for a corner-positioned lightning strike point showed a doubling of the impulse coefficient compared to the corresponding central strike point of the grounding grid.

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