Abstract
The breeze vibration duration of conductors is long, the vibration amplitude is strong and the frequency range is wide for electric power transmission lines in strong wind areas, which seriously affects the safe and stable operation of transmission lines. There are two design schemes of conductors which can achieve the purpose of reducing wind-induced disaster. One is enhancing the structural strength of conductors to withstand wind load, but the investment is enormous and the effect is limited. The other is developing drag reduced conductors to reduce wind load by changing conductor structure. This paper started from application feasibility analysis of drag reduced conductors and designed four drag reduced conductors by structure optimization of the conventional aluminium conductor steel reinforced JL/G1A-630/45-45/7, denoted as DFY630/45(45°)-R3.5, DFY630/45(60°)-R3.5, DFY630/45(45°)–R3.2 and DFY630/45(60°)-R3.2, respectively. The wind tunnel test was performed and the wind resistance coefficients in unit length of five conductors were compared. Result showed that the wind resistance coefficients in unit length of four drag reduced conductors were obviously lower than that of the conventional conductor. By controlling the manufacturing process, popularization and application of drag reduced conductors for transmission lines in strong wind areas can be realized.
Highlights
With the development of China’s economy and the improvement of people’s living standard, the power demand of whole society increases sharply
Operation experience of current transmission lines indicates that the breeze vibration duration of conductors is longer, the vibration amplitude is stronger and the frequency range is wider under continuous strong wind conditions in the north-western region, which seriously affects the safe and stable operation of transmission lines and causes enormous economic losses
Four drag reduced conductors were designed based on the structure optimization of the conventional aluminium conductor steel reinforced
Summary
With the development of China’s economy and the improvement of people’s living standard, the power demand of whole society increases sharply. The north-western region in China, especially Xinjiang, Gansu and Ningxia Province belong to strong wind areas, the duration of strong wind is long and the wind speed is even and stable. Electric power transmission lines passing through the above areas will be greatly influenced by the strong wind climate. Operation experience of current transmission lines indicates that the breeze vibration duration of conductors is longer, the vibration amplitude is stronger and the frequency range is wider under continuous strong wind conditions in the north-western region, which seriously affects the safe and stable operation of transmission lines and causes enormous economic losses
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