坡型风攻角下绝缘子串动态风偏响应特性  

Dynamic Wind-induced Deflection Response Characteristics of Insulator String Under Slope Wind Attack Angle

作　　者：胡鑫 王璋奇 田瑞 HU Xin;WANG Zhangqi;TIAN Rui(Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding 071003,China)

机构地区：[1]河北省电力机械装备健康维护与失效预防重点实验室(华北电力大学),保定071003

出　　处：《高电压技术》2022年第1期289-297,共9页High Voltage Engineering

基　　金：中央高校基本科研业务专项基金(2019QN130)。

摘　　要：为系统性研究坡型风攻角作用下绝缘子串动态风偏响应特性,提出一种坡型风攻角下绝缘子串动态风偏计算模型与响应特性分析方法。首先,基于导线风偏摆动固有频率不变原则建立导线等效模型,选取两侧导线作用位置施加外部载荷,构建坡型风攻角下绝缘子串动态风偏计算模型;其次,以动力学方程与功率谱法为切入点,推导得到风偏模型的幅频特性函数与响应均方值,分析绝缘子串风偏均值与摇摆幅值对不同坡型风攻角和不同线路结构的变化特性;最后,通过工程实例与有限元模型进行对比,验证了绝缘子串动态风偏模型与风偏响应特性分析方法的正确性。研究表明:绝缘子串风偏响应均值、摇摆幅值与坡型风攻角呈正比,摇摆固有频率与坡型风攻角呈反比;随风攻角度增加,风偏均值斜率不变,摇摆幅值斜率增加,工程设计中风偏放大系数的选取应考虑风攻角的影响。研究结果可为架空线路防风偏设计提供参考与理论支持。In order to systematically study the dynamic wind-induced deflection response characteristics of insulator string under slope wind attack angle,a dynamic wind-induced deflection calculation model and a response characteristic analysis method of insulator string under slope wind attack angle were proposed.Firstly,the equivalent model of conductor was derived based on the principle that the natural frequency of the conductor swings is constant.Through applying external loads to the action position of conductors on both sides,the dynamic wind-induced deflection calculation model of insulator string under slope wind attack angle was established.Secondly,based on the dynamic equation and power spectrum method,the amplitude-frequency characteristic function and the response mean square value of the wind-induced deflection model were derived.Subsequently,the change performances of the mean value and swing amplitude of the insulator string for different slope wind attack angles and different line structures were analyzed.Finally,through the results comparison between the engineering example and the finite element model,the correctness of the dynamic wind-induced deflection model of the insulator string and the response characteristics analysis method were verified.The results show that,the mean value and swing amplitude of the wind-induced deflection of insulator string are proportional to the slope wind attack angle.The swing natural frequency is inversely proportional to the slope wind attack angle.As the wind attack angle increases,the slope of the mean value remains unchanged,and the slope of the swing amplitude increases.The influence of wind attack angle should be considered in the selection of wind-induced deflection magnification factor in engineering design.These research findings can provide references and theoretical supports for the anti-wind design of overhead lines.

关 键 词：绝缘子串 坡型风攻角 动态风偏模型 功率谱法 幅频特性函数 响应特性 

分 类 号：TM75[电气工程—电力系统及自动化]