Grounding Resistance Detection Technology for Transmission Towers Based on Grounding Grid Topology Structure

In response to the measurement deviation problems caused by the difficulty of wire laying operation, inaccurate wire laying direction, and insufficient wire laying distance in the detection of grounding resistance of transmission towers, this paper proposes a non excavation grounding resistance calculation method based on accurate measurement of grounding network topology structure. By accurately measuring topological parameters such as burial depth, burial length, and distribution density of grounding grid rays, combined with dynamic correction of soil resistivity, precise calculation of grounding resistance can be achieved. To verify the effectiveness of this method, this paper selected 32 towers from the 500kV Ningxiang Xiangtan West Line and the 110kV Hegan Line for on-site testing. The results showed that the grounding resistance values calculated based on the fine topology structure of the grounding grid were in good agreement with the traditional measured values. This study provides a new technological path for detecting grounding resistance in transmission lines, which can effectively overcome the limitations of traditional detection methods and has great practical application significance.