覆冰输电线路塔线体系的脱冰振动

云南省某 500 kV交流输电线路位于滇东北，在高海拔、重覆冰等恶劣条件下，存在严重的覆冰输电线脱冰振动问题。本文以该输电线路为例建立了考虑输电塔线体系偶联作用的有限元模型，并利用修改密度法进行了脱冰振动分析。分析表明，由于塔体吸收了振动能量，塔线体系的最大脱冰张力和位移均比线体系小，塔体还将将一部分能量传递给了没有脱冰的导线和地线，引起其相应的震动。根据振型特点确定的半跨脱冰会增大导线的振动位移，而对张力影响不大。

Ice shedding vibration of transmission line system of ice cover transmission line

There are severe ice shedding vibration problems in the 500 kV AC transmission line located in Northeast Yunnan, which is in the high altitude, heavy ice conditions. In this paper, a finite element model considering the coupling effect of transmission tower line system is established, and the vibration analysis of the system is carried out by using the modified density method. The results show that the maximum tension and displacement of vibration of the tower line system is smaller than that of the line. The tower will transfer a part of the energy to the conductor and ground wire without the ice shedding. According to the characteristics of vibration mode, the semi-span ice shedding may effectively increase the vibration displacement of the conductor to some extent, but has little effect on the tension of the conductor.