Abstract
It has been determined that the discharge of lightning current to ground through grounding grid results in high potential at the grounding grid and other nearby grounding grids, which is very destructive. In the present paper, based on artificially triggered lightning technology, the characteristics of the ground potential rise (GPR), the transient effect at the active grid under the transient impulse of lightning current was analyzed. The impulse grounding resistance is found to decrease for large input currents. On the other hand, for small input currents, it usually increases. In addition, the characteristics of the transfer potential of the passive grid which is located 40 m from the active grid were analyzed. It was shown that the peak value of the transfer potential at the passive grid was approximately 5.1% of the peak value of the ground potential at the active grid during the return stroke. The achievements made in this study may contribute toward the optimization of the simulation model.
Highlights
A grounding grid is critical throughout the entire lightning protection system
In the case of a lightning stroke, a grounding grid can allow lightning current to be quickly discharged to the ground, and reduce the damage caused by strong lightning current
Chen et al [12] carried out tests of lightning protection for automatic weather stations based on artificially triggered lightning, and found that the ground potential counterattack caused by the superposition of long continuous lightning current and multiple return strokes may damage the surge protective devices (SPD) with the rated flow rate connected to the grounding grid 5 m away
Summary
A grounding grid is critical throughout the entire lightning protection system. In the case of a lightning stroke, a grounding grid can allow lightning current to be quickly discharged to the ground, and reduce the damage caused by strong lightning current. The discharge of lightning current will result in a rapid ground potential rise (GPR, usually hundreds or even thousands of kV) in the active grid Such a high potential will damage the connected electrical equipment. Chen et al [12] carried out tests of lightning protection for automatic weather stations based on artificially triggered lightning, and found that the ground potential counterattack caused by the superposition of long continuous lightning current and multiple return strokes may damage the surge protective devices (SPD) with the rated flow rate connected to the grounding grid 5 m away. Guo et al [13] carried out research on the interaction between two grounding grids based on triggered lightning They obtained the waveforms of GPR at the passive grounding grid in the case of common ground and analyzed its characteristics. The characteristics of the GPR, the transient effect of the grounding grid, as well as the characteristics of the transfer potential at the passive grounding grid are analyzed
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