架空输电线路大跨越导线微风振动试验

Experiments on aeolian vibration of large span overhead transmission lines

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。

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 influenceon 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.