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<p>This short paper comments on a recent article published in <i>Electrical Engineering</i> (Springer), where a vertical needle-shaped conductor is analyzed, first alone and then added to a horizontal star grounding electrode. The authors claim that the addition of the needle reduces the grounding impedance of the system; we tend to believe that the conclusion may be correct; unfortunately, the published results may not be reliable, as the mathematical/physical description of the electromagnetic field presented is, in our opinion, incomplete, mainly because the time-varying magnetic field within the ground has been ignored.</p>

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Comments on the design of needle-shaped tower grounding devices

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • J. A. Brandão Faria

摘要

This short paper comments on a recent article published in Electrical Engineering (Springer), where a vertical needle-shaped conductor is analyzed, first alone and then added to a horizontal star grounding electrode. The authors claim that the addition of the needle reduces the grounding impedance of the system; we tend to believe that the conclusion may be correct; unfortunately, the published results may not be reliable, as the mathematical/physical description of the electromagnetic field presented is, in our opinion, incomplete, mainly because the time-varying magnetic field within the ground has been ignored.