Drag reduction mechanism and aerodynamic characteristics of a newly developed overhead electric wire

Characteristics of Rainfall in Wind Field of a Downburst and Its Effects on Motion of High-Voltage Transmission Line

“…The result indicated that the coupled effects of the towers and the conductor on the responses of the tower, as well as the across-wind vibration of the tower, must be considered in the wind-resistant design of electrical transmission towers. Eguchi et al [8] developed a new type of electric wire for overhead transmission lines to reduce the drag force under typhoon conditions. By wind tunnel experiments, it is found that the free shear layer oscillation at 70 ∘ was the key to the separation point shift, and the flow fluctuation generated by the oscillation was the seed of the large eddy which collides with the wire surfaces.…”

“…By wind tunnel experiments, it is found that the free shear layer oscillation at 70 ∘ was the key to the separation point shift, and the flow fluctuation generated by the oscillation was the seed of the large eddy which collides with the wire surfaces. Kikuchi et al [9] mounted a watering grid upwind on the wind tunnel test section to measure the drag coefficients in typhoon-weather conditions with heavy rainfalls (8,10,16,25, and 40 mm per 10 min). The experimental results from the wind tunnel unveiled that the influence of heavy rainfall was not negligible on the new-design wire, which showed about 20% of increase in the drag coefficient in the cross-flow condition.…”

Mechanism analysis of rain-wind induced vibration on high-voltage transmission line

“…Kikuchi [1,2] sets up a watering grid upwind in the wind-tunnel's test section to simulate aerodynamic characteristics of over-head power lines in heavy rainfall and wind. Li [3,4] takes rainfall as a shock load to combine with wind turbulence and proposes a calculation method for the combination of rain excitation with wind force.…”

Short-Term Reliability Evaluation of Transmission System under Strong Wind and Rain

“…However, current reliability research of overhead lines rarely consider the impact of strong wind and rain loads, the current design criteria of overhead lines focuses on wind and ice loads [6]- [9] and ignores the impact of the rain loads, the impact of strong wind and rain loads will cause huge damage to tall building, especially overhead lines, those accidents [10] attract experts' attention of electricity and engineering widespread. References [11]- [14] study the effect of different rainfall intensity on the vertical drag coefficient of overhead lines in wind tunnel experiment, but they don't do the analysis of the mechanism. Reference [12] established a precise finite element model of overhead lines and studied rain-wind-induced dynamic response of transmission tower, but they didn't study the effect of wind and rain loads' impact to reliability of the overhead lines.…”