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<p>The grounding system is critical for ensuring transmission line safety, as elevated surge grounding impedance may significantly increase lightning-induced trip-out risks in electric power systems. To achieve significant reduction in surge grounding impedance, this paper presents an FGGM-based cylindrical-shell tower grounding grid. Firstly, the paper reviews our earlier assessments of FGGM-based cylindrical-shell tower grounding grid’s power–frequency (50&#xa0;Hz) grounding performance and its resistance reduction mechanism. Next, an FEA model incorporating both ionization effect and inductance effect in surge current dissipation is established and validated against experimental data from a 26-m vertical grounding rod. Moreover, an optimized design is performed for the FGGM-based cylindrical-shell tower grounding grid through systematic assessment of how wrapping parameters (radius, position, and depth) affect both the RR and the RPU. The numerical simulations show that, FGGM-based cylindrical-shell tower grounding grid demonstrates significant surge grounding impedance reduction performance. The RR increases progressively with larger WR and greater WD, peaking at 66.34% for a 1-m radius, while exhibiting an inverse relationship with WP that results in only 31.00% RR at the tower foundation lowest WP. The ionization effect represents the dominant contribution compared to the inductance effect in surge grounding impedance reduction. The FEA results elucidate dynamic variation mechanisms of surge grounding impedance of FGGM-based cylindrical-shell tower grounding grid.</p>

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FEA on surge response of FGGM-based cylindrical-shell tower grounding grid

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Weichen Yan,
  • Xiangxu Kong

摘要

The grounding system is critical for ensuring transmission line safety, as elevated surge grounding impedance may significantly increase lightning-induced trip-out risks in electric power systems. To achieve significant reduction in surge grounding impedance, this paper presents an FGGM-based cylindrical-shell tower grounding grid. Firstly, the paper reviews our earlier assessments of FGGM-based cylindrical-shell tower grounding grid’s power–frequency (50 Hz) grounding performance and its resistance reduction mechanism. Next, an FEA model incorporating both ionization effect and inductance effect in surge current dissipation is established and validated against experimental data from a 26-m vertical grounding rod. Moreover, an optimized design is performed for the FGGM-based cylindrical-shell tower grounding grid through systematic assessment of how wrapping parameters (radius, position, and depth) affect both the RR and the RPU. The numerical simulations show that, FGGM-based cylindrical-shell tower grounding grid demonstrates significant surge grounding impedance reduction performance. The RR increases progressively with larger WR and greater WD, peaking at 66.34% for a 1-m radius, while exhibiting an inverse relationship with WP that results in only 31.00% RR at the tower foundation lowest WP. The ionization effect represents the dominant contribution compared to the inductance effect in surge grounding impedance reduction. The FEA results elucidate dynamic variation mechanisms of surge grounding impedance of FGGM-based cylindrical-shell tower grounding grid.