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Dynamic modeling of grounding device impact characteristics considering coupling of river seepage, water velocity and current dispersion

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Abstract

Accurately calculating the characteristics of impulse-dispersed currents in cross-river tower grounding devices is a fundamental work. This paper presents the dynamic model of impulse characteristics of grounding device considering the coupling of river seepage, water velocity and current dispersion. Firstly, a finite-element model is established for the flow field, taking into account the dynamic process of river seepage to surrounding soils, and which calculates the distribution of soil water saturation. Next, an electrical finite-element model is established to calculate the impulse-dispersed current process. To simulate the effects of river water seepage and soil ionization on soil parameters, a dynamic function for soil resistivity with changes in electric field strength and soil water saturation is suggested. The influence of water velocity on seepage was quantitatively simulated by Bernoulli's principle. Finally, based on the proposed method, a model for a representative tower grounding device located near a river is developed to analyze the impact of seepage and soil structure on soil resistivity, current density, and electric field strength distribution. The findings indicate that the seepage of river water into the surrounding soil significantly changes the soil's resistivity and its spatial distribution characteristics. Additionally, the dispersion current tends to dissipate in areas underneath the river, thus changing the distribution of electric field strength within the soil. The aquifuge has a significant impact on groundwater seepage. However, if the aquifuge is situated more than 90 m below the ground, its effect can be ignored. In contrast, soil structure without an aquifuge can closely approximate a vertically structured soil. In practical engineering, appropriate models should be selected based on the specific characteristics of the soil structure and water velocity to ensure the pre-work accuracy of lightning protection optimization design.

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Authors and Affiliations

  1. School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou, 450001, China

    Jingli Li, Zizhuo Zhu, Luyao Liu & Chuanju Li

  2. State Grid Zhengzhou Power Supply Company, Zhengzhou, 450001, China

    Wei Bao & Yuehao Yan

  3. State Grid Hebi Power Supply Company, Hebi, 458000, China

    Junyue Ren

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  1. Jingli Li
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Contributions

Jingli LI and Zizhuo ZHU wrote the main manuscript text. Wei bao, Yuehao YAN prepared figures 1-4 and Table 1. Luyao LIU, Chuanju LI and Junyue REN prepared figures 7-12 and Table 2. All authors reviewed the manuscript.

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Correspondence to Jingli Li.

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Li, J., Zhu, Z., Bao, W. et al. Dynamic modeling of grounding device impact characteristics considering coupling of river seepage, water velocity and current dispersion. Electr Eng 106, 4185–4199 (2024). https://doi.org/10.1007/s00202-023-02210-w

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  • DOI: https://doi.org/10.1007/s00202-023-02210-w

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