Wind Tunnel Tests on Aerodynamic Characteristics of Ice‐Coated 4‐Bundled Conductors

Abstract

Wind tunnel tests were carried out to obtain the static aerodynamic characteristics of crescent iced 4-bundled conductors with different ice thicknesses, initial ice accretion angles, bundle spaces, and wind attack angles. The test models were made of the actual conductors and have a real rough surface. Test results show that the influence of wake interference on the drag coefficients of leeward subconductors is obvious. The interference angle range is larger than 20 ∘ and the drag coefficient curves of leeward subconductors have a sudden decrease phenomenon at some certain wind attack angles. The absolute value of the lift and moment coefficient increases with the increase of the ice thickness. In addition, the galloping of the iced subconductor may occur at the angle of wind attack near ±20 ∘ and the wake increases the moment coefficient. The variation of initial ice accretion angle has a significant influence on the aerodynamic coefficients. The aerodynamic coefficient curves exhibit a "moving" phenomenon at different initial ice accretion angles. The bundle spaces have a great influence on the moment coefficient of leeward thin ice-coated conductors. With the increase of ice thickness, the bundle spaces generally have little influence on the aerodynamic coefficients.

Free vibration analysis of transmission lines based on the dynamic stiffness method

“…Dynamic stiffness can be applied to evaluate the dynamic response of cables and of cable-supported structures in any cable-structure system. Galloping is associated with the high amplitude and additional tension in the cable, which can lead to damage to the electrical power network, such as short circuiting, failure of sub-conductors and spacers, and even the collapse of towers [1,2]. Figure 1 shows the damage to the spacer and the tower arm due to transmission line galloping.…”

Full-Scale Reconstruction for Transmission Line Galloping Curves Based on Attitudes Sensors

“…Moreover, Finite Element Method-based (FEMbased) approaches [12,13] with various analytical tools, such as ABAQUS [14] and FLUENT [15], have been applied in numerical investigations on aerodynamic galloping problems. Furthermore, full-scale test transmission lines [1,3] and wind tunnels [16] have been established to test the galloping behavior and antigalloping techniques, but some limitations remain. Although such studies have been performed in both theory and practice, there is no universal theory to explain the galloping mechanism.…”