Device inhibiting transmission lines from wind-rain induced vibration and galloping

Abstract

The invention relates to a device inhibiting transmission lines from wind-rain induced vibration and galloping. The device is composed of central transmission lines and a surface sheath. The device is characterized in that the surface of the surface sheath includes two spiral projections in two opposite directions. The bidirectional spiral projections can change separation points of an air flow field at the boundary layer of the surface of the transmission lines, and avoids ruled Kaman vortex shedding; the projections in the opposite directions can destroy axial current eddy formed in the axial direction of the lines, change 3D structure of the cross section of the lines, reduce influence of pneumatic active force on lines, and inhibit the lines from galloping; and the bidirectional spiral destroys a waterway in which rainwater flows downwardly along the surface of the lines, prevents formation of continuous water lines, avoids the water lines from oscillation at the surface of the lead, and avoids the lines from wind-rain induced vibration.

Description

technical field [0001] The invention relates to a surface device of a power transmission wire, in particular to a device capable of suppressing wind and rain-induced vibration and galloping of the power transmission wire. Background technique [0002] With the rapid development of UHV transmission lines, transmission towers are increasingly characterized by towering structures, thick conductor cross-sections, and long spans. Therefore, it is very easy to vibrate under the action of wind load. Common forms of vibration include wind and rain excitation and dancing. Among them, the wind-wind-induced vibration is a low-frequency, large-scale vibration that occurs when the conductor induces aerodynamic instability under specific wind-wind coupling conditions. Most researchers believe that the formation of rain lines on the surface of conductors is the main reason for inducing wind-rain-induced vibration. The galloping of the transmission wire is a low-frequency, large-amplitud...

AI Technical Summary

Problems solved by technology

Although the wound helix can also destroy the formation of rain lines on the surface of the conductor, interfere with the oscillation of the rain line on the surface of the conductor, and reduce the possibility of wind and rain-induced vibration; but a large number of helixes will increase the windward area of ​​the conductor surface, thereby increasing the conductor's The drag coefficient is not effective in suppressing wind and rain induced vibration

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