架空线路无覆冰导线舞动的参数共振机理

Parametric resonance mechanism of conductor galloping without icing on overhead line

为了解释架空线路导线舞动现象的成因,通过将风载荷等效为轴向周期位移激励的方法,对架空线路单导线舞动进行了研究,认为无覆冰单导线的舞动就是参数共振。引起导线舞动的主要因素是线路系统自身参数的周期性变化,当轴向位移激励频率和导线系统频率满足一定关系时,导线系统将发生大幅度横向参数共振即舞动。模拟运行线路舞动试验验证了用参数共振理论能够解释无覆冰架空单导线系统的起舞现象。

In order to explain the causes of the overhead line conductor galloping phenomenon better,the galloping on overhead line with a single conductor is studied by equating the wind load to axial periodic displacement excitation.It is concluded that the galloping of a single conductor without icing is parametric resonance.According to this mechanism,the main influence factors of the galloping are the periodic variation of transmission line system′s parameters.The parametric resonance of system will occur,i.e.galloping,when the excitation frequency and eigenfrequency of system satisfy a certain relationship.The mechanism established is verified to be able to explain the transmission line conductor galloping through simulated operational line vibration experiments.