架空输电线路大跨越导线微风振动试验

为了掌握架空输电线路大跨越导线微风振动特性,设计制作了大跨越导线微风振动试验模型,研究了不同张力作用下,安装防振锤前后大跨越导线的振动响应,重点分析了防振锤耗能效果以及安装位置对导线振动的影响,并与理论分析结果进行对比,提出了大跨越导线防振锤的安装位置计算公式。试验结果表明:运行张力对大跨越导线微风振动影响较大,导线本身的阻尼线对微风振动的抑制作用十分有限;安装防振锤的导线振动幅值小于未安装防振锤的裸导线,但随着张力的增大,防振锤的防振频段收窄,防振效果降低;防振锤的安装位置对导线振动影响较大,防振锤安装位置应兼顾各激励频率下的振动波长;FR-4型防振锤的最佳防振频段为15~25Hz,对于抑制大跨越导线的高频和低频振动效果较差。

Experiments on aeolian vibration of large span overhead transmission lines

An aeolian vibration model of transmission lines is designed and manufactured to grasp the vibration characteristics of large span overhead transmission lines. The vibration responses of a bare conductor and a conductor with a stockbridge damper are researched under different tension. The energy dissipation effect of the stockbridge damper and its installation position are analyzed and the results are compared with those of theoretical analysis. Then a calculating formula of damper installation position is proposed. The results show that the operation tension has a great impact on the aeolian vibration of large span conductors, and the controlling effect of the conductors'' damping on aeolian vibration is very limited. The vibration amplitude of the conductor with a stock bridge damper is smaller than that of the bare conductor. However, with the increase of tension, the anti-vibration band of the damper gets narrowed and its anti-vibration effect reduces. The installation position of the damper has a great influence on the vibration of the conductor, and the vibration wave length at each excitation frequency should be considered when we determine the damper''s installation position. The best anti-vibration band of FR-4 type stock bridge damper is from 15 to 25 Hz. For high frequency and low frequency vibration, its controlling effect is limited.