Dynamic Response Analysis of Asynchronous Deicing of Quad Bundle Conductor Spacer System During DC Ice Melting

In order to study the melting and falling off of the iced conductor under DC ice melting process by considering a lgj-400 / 50 transmission conductor as a research object, Ansys LS-DYNA model is used for simulating the response of materials under short periods of high-intensity loads and a nonlinear structural dynamics model is used to establish the finite element model of split conductor system in the actual process. In the process of finite element analysis, solid45 element is used to model the conductor layer by layer. During the calculation process, the life and death element method is used to transform its element stiffness matrix to near zero icing element for accurately simulating the actual situation during ice melting. Currently, the research on the deicing of the split conductor mostly equates the split conductor to a single conductor for calculation. In the actual ice melting operation, the split conductor system has a phenomenon of asynchronous deicing, so it is necessary to analyze the deicing of different sub-conductors. The results show that the jump height of the deicing conductor under DC deicing is smaller than that of the normal deicing. The jump height and tension of conductor deicing decrease with an increase in the deicing current. When the sub-conductors of the four-bundle conductor spacer system are not deiced synchronously, the two sub-conductors on the diagonal and two sub-conductors below are deiced, the split conductor system is relatively stable. When the sub-conductors under other working conditions are not deiced synchronously, the four-bundle conductor spacer system has lateral swing, resulting in torsional risk, which causes conductor wear and strand breaking accidents.