输电导线空气动力特性研究进展

我国输电线路工程普遍具有线路长、跨度大的特点,传统的输电方式难以满足输电工程的要求,所以目前的研究集中在了特高压直流和特高压交流输电技术.这种特殊的输电方式实现了大跨度送电,但输电导线气动参数更为复杂,风荷载下的参与变量增多.而在风荷载激励下,输电导线易发生次档距振动和舞动两种振动现象,这直接影响着电网的运行安全.分析导线在风荷载作用下的空气动力特性是研究输电线路风致振动机理的基础.因此,为了能准确掌握提高输电线路可靠性与稳定性的关键技术,科研人员从多方面对输电导线的空气动力特性进行了严谨的研究.对此进行了归纳与梳理,这为扩展交、直流输电技术以及输电导线的风致振动防治提供了研究思路.

Progress in Aerodynamic Characteristics of Transmission Conductors

Because the transmission lines in China are particularly long with a long span,the traditional transmission mode is difficult to meet the requirements of power transmission engineering.Therefore,the current domestic research focuses on UHVDC(high-voltage direct current)and UHVAC(ultra-high-voltage direct current)transmission technology.This kind of special transmission mode realizes long-span power transmission,but the aerodynamic parameters of transmission lines are more complex,and the number of participating variables under wind load increases.Under the wind load,the transmission line is prone to two kinds of vibration:sub-span vibration and galloping,which directly affect the operation safety of the power grid.The analysis of aerodynamic characteristics of conductor under wind load is the basis of studying the mechanism of wind-induced vibration of transmission lines.Therefore,in order to accurately grasp the key technology to improve the reliability and stability of transmission lines,researchers have conducted rigorous research on the aerodynamic characteristics of transmission lines from many aspects.This paper sums up and sorts out the research done,which provides clear ideas for the expansion of AC and DC transmission technology and the prevention and control of wind-induced vibration of transmission lines.