Research on Resistance Reduction Method of Transmission Line Tower Epitaxial Grounding Based on Slope Soil Nailing Wall

Aiming at the problem of high grounding resistance of transmission line tower along the steep slope of the road, this paper proposes a method of reducing the resistance of the steel mesh in the soil nailing wall supported in the steep slope terrain, and builds the tower grounding grid and soil nailing wall along the steep slope terrain. The model compares and analyzes the changes of grounding parameters such as grounding resistance and step voltage before and after connecting the soil nailing wall, and analyzes the influence of the number of connecting wires, connection position, connection material and tower grounding grid position on the grounding resistance of the tower grounding grid. The simulation results show that the resistance reduction effect of the soil nailing wall on the tower grounding grid can reach 19.3–73.4%, and the maximum step voltage of the soil surface where the grounding grid is located is not more than 6 kV, which verifies the feasibility of the soil nailing wall scattered current resistance reduction method. The more the number of connecting wires, the smaller the low resistance, but the resistance reduction efficiency reaches 56.3% when the number of connecting wires is 4, which tends to be saturated. The more dispersed the connection position, the smaller the tower grounding resistance; the resistance reduction efficiency of the connecting wires using the new graphite composite material is 9.04% higher than that of the galvanized steel. The grounding grid is set on the slope and can have lower grounding resistance.