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Wind and Structures Volume 34, Number 2, February 2022 (Special Issue) pages 173-183 DOI: https://doi.org/10.12989/was.2022.34.2.173 |
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Galloping characteristics of a 1000-kV UHV iced transmission line in the full range of wind attack angles |
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Wenjuan Lou, Huihui Wu, Zuopeng Wen and Hongchao Liang
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| Abstract | ||
| The galloping of iced conductors has long been a severe threat to the safety of overhead transmission lines. Compared with normal transmission lines, the ultra-high-voltage (UHV) transmission lines are more prone to galloping, and the damage caused is more severe. To control the galloping of UHV lines, it is necessary to conduct a comprehensive analysis of galloping characteristics. In this paper, a large-span 1000-kV UHV transmission line in China is taken as a practical example where an 8-bundled conductor with D-shaped icing is adopted. Galerkin method is employed for the time history calculation. For the wind attack angle range of 0°~180°, the galloping amplitudes in vertical, horizontal, and torsional directions are calculated. Furthermore, the vibration frequencies and galloping shapes are analyzed for the most severe conditions. The results show that the wind at 0°~10° attack angles can induce large torsional displacement, and this range of attack angles is also most likely to occur in reality. The galloping with largest amplitudes in all three directions occurs at the attack angle of 170° where the incoming flow is at the non-iced side, due to the strong aerodynamic instability. In addition, with wind speed increasing, galloping modes with higher frequencies appear and make the galloping shape more complex, indicating strong nonlinear behavior. Based on the galloping amplitudes of three directions, the full range of wind attack angles are divided into five galloping regions of different severity levels. The results obtained can promote the understanding of galloping and provide a reference for the anti-galloping design of UHV transmission lines. | ||
| Key Words | ||
| full range of attack angles; galloping characteristic; galloping region division; iced 8-bundled conductor; UHV lines | ||
| Address | ||
| Wenjuan Lou:Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, P.R. China Huihui Wu:Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, P.R. China Zuopeng Wen:Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, P.R. China Hongchao Liang:Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, P.R. China | ||