Aerodynamic Response of Long-Span Transmission Line Conductors: Wind Tunnel Experiments and Drag Coefficient Analysis

This paper systematically analyzes the mechanical behavior of long-span transmission line conductors under varying wind speeds and directions through wind tunnel experiments. The experiments were conducted using the low-speed recirculating wind tunnel at Shanghai University of Electric Power, simulating wind speeds ranging from 10m/s to 30m/s, covering common wind conditions encountered during actual transmission line operations. The test objects were 1-meter-long aluminum bare stranded wires. By measuring the lift, drag, and torque on the conductors under different wind speeds, aerodynamic characteristic data were obtained. The results indicate that the drag coefficient of the conductors generally increases with wind speed, suggesting a corresponding rise in aerodynamic forces. Variations in drag coefficient patterns among different conductor types may be attributed to differences in geometric shape, material properties, or surface treatments.