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Enhanced heat transfer characteristics and ampacity analysis of a high-voltage overhead transmission line under aeolian vibration

Enhanced heat transfer characteristics and ampacity analysis of a high-voltage overhead transmission line under aeolian vibration

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High-voltage overhead transmission lines feature both electrical conductivity and mechanical strength properties. Current studies of the aeolian vibration of transmission lines focus primarily on the mechanical properties of these lines but rarely address the lines’ enhanced heat transfer properties, which directly affect transmission line ampacity. In this study, the authors analyse the vibration-enhanced heat transfer characteristics of an energised transmission line undergoing aeolian vibration based on the coupled fluid–solid numerical method. The allowable ampacity is calculated using the heat balance method, which accounts for the heat transfer enhancement effect arising from aeolian vibration. Various parameters, such as the vibration amplitude and the ratio between the natural frequency of the conductor and the frequency of the vortex shedding, are investigated. The results demonstrate that aeolian vibration can effectively improve the heat dissipation effect of the conductor and significantly increase the line ampacity. The maximum heat transfer effect occurs in the lock-in region, in which the allowed ampacity can increase by more than 6%.

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