Study on Dispersion Characteristics and Drag Reduction Efficiency of Transmission Line Tower Fractal Epitaxial Grounding

Reducing the grounding resistance of transmission line tower is helpful to reduce lightning trip and ensure the safe operation of power system. In response to the problems of difficult construction and high grounding resistance in traditional grounding grid forms in mountainous and complex terrain areas, fractal theory is introduced to propose a resistance reduction scheme for laying fractal epitaxial grounding grids on transmission line towers. The finite element simulation software is used to establish the fractal epitaxial grounding grid model with flexible graphite as the material. The effects of angle, fractal dimension, fractal layers on its grounding characteristics are studied. Then various typical epitaxial grounding grid models were established and the grounding characteristics were compared. The calculation results show that proper angle, lower fractal dimension and lower fractal layers are helpful to improve the grounding resistance reduction effect of fractal epitaxial grounding grid, and the resistance reduction effect shows different trends with the change of soil resistivity. The proposed fractal epitaxial grounding grid laying scheme can provide a reference for the design of transmission line tower grounding grids in mountainous areas and other areas with high difficulty in traditional epitaxial grounding grid laying.