1. School of Architectural Engineering, Northeast Electric Power University, Jilin 132012, China;
2. Jilin Provincial Engineering Lab of Safety Technology of Power Transmission Projects, Jilin 132000, China
Abstract：In order to study the problem of ice melting and falling off of iced conductor under DC ice melting process, taking the lgj-400/50 transmission conductor as the research object, the finite element model of quad bundle conductor system in actual operation process is established by using ANSYS LS-DYNA preppost and nonlinear structural dynamics model. In the process of finite element analysis, solid45 element is used for layered modeling of the conductor, and the life and death element method is used to kill the icing element in the calculation, so as to more accurately simulate the actual situation during ice melting. At present, most studies on deicing of split conductors are equivalent to single conductors for calculation，During the actual ice melting operation, the split conductor has the phenomenon of asynchronous deicing. The deicing conditions of different sub conductors are analyzed. The results show that the jump height of deicing conductor under DC deicing is smaller than that of normal deicing, and the jump height and tension of conductor deicing decrease with the increase of deicing current; For the quad bundle conductor spacer system, when the sub conductors are not de iced synchronously, the diagonal de icing of the two sub conductors and the de icing of the two sub conductors below are relatively stable. When the sub conductors are not de iced synchronously under other working conditions, the quad bundle conductor spacer system has lateral swing, resulting in torsional risk, which will cause conductor wear and strand breakage accidents.
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