Abstract
Despite the fact that the wind tunnel tests have been carried out on iced transmission lines subjected to wind load, it is not practical to do wind tunnel tests due to its high cost. This paper describes a detailed numerical simulation method that can be used to instead of wind tunnel tests. Based on the galloping mechanism of iced transmission lines, the aerodynamic test was simulated with the typical crescent super-large thickness iced four bundled conductors. One of the results highlighted in this study is that the wind angle of attack had significant influence on the aerodynamics of iced conductors. The Den-Hartog and O.Nigol coefficient were calculated to determine galloping of iced transmission lines, comparing with the reference of wind tunnel test in the Zhejiang university, the range of the wind angle of attack to the bundled conductor which can lead to gallop is larger than single wire, but the absolute value of amplitude is less than the single conductor, split conductor is more likely to gallop than single conductor.
Highlights
The countries like America, Canada, the Netherlands, Japan, and Russia have carried out considerable research on the galloping in wind tunnel
A series of experimental data in Germany demonstrated that split conductors were more likely to gallop than single conductors
The range of the wind angle of attack to the bundled conductor is bigger than that of single conductor, but the absolute value is less than the single conductor, so split conductor is more likely to gallop than single conductor, the amplitude of galloping will be less than single conductor
Summary
The countries like America, Canada, the Netherlands, Japan, and Russia have carried out considerable research on the galloping in wind tunnel. Due to the variety of ice shape, we need to spend a great amount of money to research the aerodynamic force of the iced transmission lines, because it is unrealistic to get the aerodynamic data only through the wind tunnel test. The numerical simulation can be chosen for studying the aerodynamic characteristics of iced transmission lines instead of wind tunnel test [8,9,10]. Single conductors are likely to gallop when the wind speed is from 8 to 15 m/s, but to the bundled ones, the wind speed range is 4 to 23 m/s [19]. It can be seen that bundled conductors can gallop at lower wind speed than single wires, and the range of wind speed is larger than single conductor
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