输电线路拉链式脱冰振动特性试验研究

Experimental Study on Vibration Characteristic of Transmission Lines Under Unzipping Ice Shedding

为研究输电线路拉链式脱冰时的振动特征,针对220 kV两档输电线路,开展不同脱冰速度、脱冰方式和覆冰厚度条件下导线模拟脱冰试验,测量了导线脱冰过程中不同位置位移和张力的变化规律。试验结果表明:相比两档同时脱冰,拉链式脱冰时导线的动态响应较弱,但最大反向位移会低于覆冰静态位置,且当覆冰脱落至档中位置时此处导线张力瞬间减小。两档依次拉链式脱冰导线的最大跳跃高度及反向位移大于两档同时拉链式脱冰,且该脱冰方式下最大跳跃高度和跨中张力突变均随覆冰厚度增大而增大。在覆冰脱落过程中导线上各测点横向位移变化较小,可忽略其影响。研究结果可为输电线路抗冰灾设计和除冰动力分析提供参考。

In the condition of different unloading speed,shedding order and thickness of conductor ice,the simulation ice shedding test was carried out in a 220 kV two spans electric transmission line in order to study the vibration characteristics of transmission lines under unzipping ice shedding.Results showed that the dynamic response of transmission lines during unzipping ice shedding is weaker compared with the condition of ice shedding simultaneously at the whole line,but the maximum reverse displacement is lower than the static position of the iced conductor,and the tension has a sharp decrease at the middle of the line when the ice shed to the middle of the line.The maximum jump height and the tension mutation of the condition of sequentially unzipping ice shedding are greater than those of the contemporaneous unzipping ice shedding of the two spans.Both the maximum jump height and the tension mutation increase with icing thickness in condition of sequentially unzipping ice shedding.The change of the lateral displacement of each measuring point on the lines are small,which can be neglected in the process of ice shedding.The research conclusion can provide reference for the anti-icing design and de-icing dynamic analysis of transmission lines.