档端横向位移激励下架空导线非同期摇摆分析

Analysis of Non-synchronous Swing of Overhead Conductors Subjected toTransverse Displacement Excitation of Span End

紧凑型架空导线非同期摇摆是导致相间风偏闪络事故发生的直接原因,然而相对于单相导线与绝缘子的风偏响应研究,不同相导线非同期摇摆的理论研究还较为缺乏,本质机理尚不明确。为探究架空导线非同期摇摆机理,以档端横向位移激励为研究切入点,建立了大风工况下存在档端位移激励的架空导线风偏摆动计算模型,推导得出模型稳态响应的非线性渐进解,直观展现了档端激励与导线响应之间的数学关系,分析了架空导线非同期摇摆的参变响应特性,并通过工程实例绘制了非同期摇摆时程响应曲线图与参变响应折线图。研究表明:档端横向位移激励能改变架空导线风偏运动的重力参数,可以导致不同相导线非同期摇摆现象的发生;架空导线动态响应幅值与档端位移激励幅值、水平张力呈正比,与档距、导线单位质量呈反比。

The non synchronous swaying of compact overhead conductors is the direct cause of phase to phase wind deflection flashover accidents.However,compared to the research on wind deflection response of single-phase conductors and insulators,the theoretical study of non synchronous swaying of different phase conductors is still relatively lacking,and the essential mechanism is not yet clear.To explore the mechanism of asynchronous swaying of overhead conductors,a calculation model for wind deflection swaying of overhead conductors under strong wind conditions with lateral displacement excitation at the gear end was established.The nonlinear asymptotic solution of the steady-state response of the model was derived,and the mathematical relationship between gear end excitation and conductor response was intuitively demonstrated.The parametric response characteristics of asynchronous swaying of overhead conductors were analyzed,and the time history response curve and parametric response line graph of asynchronous swaying were drawn through engineering examples.Research has shown that lateral displacement excitation at the end of the gear can change the gravity parameters of the wind deflection motion of overhead conductors,which can lead to the occurrence of asynchronous swaying phenomena of different phase conductors.The dynamic response amplitude of overhead conductors is directly proportional to the amplitude of displacement excitation and horizontal tension at the end of the span,and inversely proportional to the span and unit mass of the conductor.