Transmission Intelligent Grounding Wire Signal Loss Analysis Considering the Terrain Correction Factor

The intelligent grounding wire can monitor the grounding condition of high-voltage equipment in real time. It is widely used in intelligent substations and has gradually been extended to transmission scenarios. The correct and reliable connection of grounding wire is the premise for maintenance work. In transmission scenarios, the communication reliability of intelligent devices is significantly affected by the terrain. A comparative analysis of communication methods for transmission intelligent devices was conducted. A model based on Okumura-Hata, incorporating topographic correction factors for hilly and mountainous digital elevation, called HMD-OH model, was proposed. The hilly and mountainous correction factors were established, and their influence on path loss was analyzed. By analyzing Digital Elevation Model (DEM), the terrain information of the pole sections was established, and two-dimensional (2D) profiles of the pole sections were created. Simulations were performed using actual coordinates and elevation information of a transmission line. The results showed that the proposed model could more accurately describe the signal propagation loss under complex terrain, providing a reference for the connection of intelligent grounding wire during on-site maintenance and offering value for the application of transmission intelligent devices.