Dynamic Characteristics Analysis of Ice-Adhesion Transmission Tower-Line System under Effect of Wind-Induced Ice Shedding

Abstract

The tower line system will be in an unsafe status due to uniform or uneven fall of ice coating which is attached to the surface of tower and lines. The fall of ice could be caused by wind action or thermal force. In order to study the dynamic characteristics of the self-failure of the transmission line under the action of dynamic wind load, a finite element model of the two-span transmission tower line system was established. The birth and death element methods are used to simulate the icing and shedding of the line. Tensile failure strength is the shedding criterion for ice coating. The fluctuating wind speed time history of the tower line system is first simulated, and then the fluctuating wind and the average wind are superimposed to generate the instantaneous wind speed and converted into wind load. The dynamic response of the transmission tower line system under iced coupling with different wind speeds and different thicknesses of ice coating was studied. This is the first attempt that the coupling dynamic response of the icing shedding and wind load for the transmission tower-line system is discussed in this paper. In addition, the dynamic characteristics of wind are included. In particular, the limiting mechanical conditions are considered. According to the simulation results, it is found: because of the ice shedding, the stress of the conductor changes obviously in the first 20 seconds, and the ground wire changes sharply in the first two seconds; the icing of the conductor (ground) wire is gradually deicing under the action of wind vibration; the displacement of tower top increases with the increase of wind speed and icing thickness.

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