架空线路绝缘子串动态风偏响应的敏感度特性EI北大核心CSCD

绝缘子串动态风偏响应敏感度可以展现风偏摆动幅值随设计参数的变化规律,有利于设计人员的理解和使用。为探究绝缘子串动态风偏响应敏感度特性,通过导线摆动固有频率不变原则提出能充分表征架空线路风偏运动的导线等效模型,建立了绝缘子串和架空导线耦合风偏运动的两自由度动力学模型;以幅频特性曲线与脉动风速谱各自峰值为切入点,运用风偏响应均方值分析了绝缘子串风偏幅值对线路结构和风速的敏感度,提出了动态风偏响应敏感风速的表达式。研究发现:绝缘子串风偏响应均方值与线路垂平比呈正比例关系,平均风速为敏感风速时绝缘子串风偏摆动最为剧烈,架空线路设计时应合理地选择线路结构使绝缘子串风偏敏感风速避开当地的卓越风速,从而降低线路发生风偏闪络的可能性。

Sensitivity characteristics of dynamic wind-induced deflection response of insulator string on overhead lines

The sensitivity of the dynamic wind-induced deflection responses of the insulator string can show the relationship between the deflection amplitude and design parameters,which is conducive to the understanding and use of designer.In order to explore the sensitivity characteristics of the dynamic wind-induced deflection response of insulator strings,the equivalent model of conductor that can fully characterize the wind-induced deflection of overhead lines is proposed by the principle of constant natural frequency,a two-degree-of-freedom dynamic model for the coupled wind-induced deflection of the insulator string and the overhead conductor is established.Based on the amplitude-frequency characteristic curve and the fluctuating wind speed spectrum,the mean square value of wind-induced deflection response is used to analyze the sensitivity of the wind-induced deflection of insulator string to the overhead lines structure and wind speed,and an expression for the sensitive wind speed of the dynamic wind-induced deflection response is proposed.The result shows that the mean square value of the wind-induced deflection of the insulator string is proportional to the vertical horizontal ratio of the overhead lines.When the average wind speed is the sensitive wind speed,the amplitude of the wind-induced swing of the insulator string reaches the maximum value.In the design of overhead lines,the lines structure should be reasonably selected so that the sensitive wind speed of the insulator string to avoid the local maximum wind speed,thereby reducing the possibility of wind-induced deflection flashover on the lines.