Research on Factors Affecting Audible Noise of 500 kV Double-Circuit Straight-Line Tower AC Transmission Line

To address the growing public concern over the issue of audible noise from overhead transmission lines, this paper focuses on the 500 kV AC double-circuit transmission line on the same tower. Using a controlled variable method under rated conditions, the paper analyzes the factors that affect audible noise, including different subconductor radii, minimum ground clearances, and phase-to-phase distances. The primary methods used in the study are the COMSOL finite element simulation software and MATLAB formula calculation, combined with the calculation of audible noise levels 1.5 m above the ground directly beneath the transmission line. The goal of the study is to identify the main factors affecting audible noise and provide feasible suggestions and measures to reduce audible noise levels from transmission lines.