Abstract：Power grid security has been threatened by transmission line ice disaster for a long time. Considering the actual icing process of transmission line, it is of great significance to establish an accurate icing model for power grid ice disaster prevention. However, the process of free torsional icing on transmission lines has not yet been well taken into account. Based on the observation results of free torsional icing on single conductors in natural environment, a mathematical simulation for the dynamic process of free torsional icing on single conductors is established in this paper. A natural site experiment of free torsional icing of GJ50 wire was carried out in Xuefeng Mountain Energy Equipment Safety National Observation and Research Station of Chongqing University, and the experimental results were compared with the simulation results. The findings of this paper are as follows: (1) The single conductor free torsional icing phenomenon was observed at the Xuefeng Mountain National Observation and Research Station and the single conductor free torsional icing process was analysed. Single conductor free twisting icing to the formation of wing-shaped ice on the surface of the conductor as a starting point, with the maintenance of the ice environment or the increase in the strength of the ice cover, repeatedly through the ice torsion torque less than the conductor counter-torsion torque holding process and ice torsion torque greater than the conductor counter-torsion torque ice driven by the conductor free twisting process, gradually forming round ice. (2) Based on the dynamic equilibrium process of ice torsional moment and counter-torsional moment during the free twisting of a single conductor over ice, a simulation model of free twisting of a single conductor over ice is established based on the principles of hydrodynamics and mechanical equilibrium. Firstly, the ice shape and mass of the wire is calculated when the wire is not twisted, and then the moment balance equation is solved to obtain the angle of free twisting of the wire around its central at this mass and to correct the ice shape. This process is repeated to achieve a dynamic simulation of a single conductor free to twist. (3) The GJ50 conductor free torsional icing field experiments and numerical simulations were carried out, and the experimental results were compared with the simulation results. The results show that under different ice periods, the simulation and experimental values of torsion angle and unit ice quality error are within 10% of the average value, the simulation of the wire ice shape and the actual shape of the ice cover match. (4) Simulation and experimental results show that when a single conductor is free to twist the ice, the angle of twist and the unit ice mass are symmetrically distributed along the centre of the conductor. During the same ice period, the closer to the centre of the conductor, the greater the torsion angle and unit ice mass of the conductor, and the closer the ice shape is to a circle. The research results of this paper will provide a reference for transmission line ice-cover simulation analysis and ice-cover reversal research.
杨国林, 蒋兴良, 廖乙, 胡建林, 张志劲. 输电线路单导线自由扭转覆冰动态仿真研究[J]. 电工技术学报, 2024, 39(13): 4079-4089.
Yang Guolin, Jiang Xingliang, Liao Yi, Hu Jianlin, Zhang Zhijin. Simulation Study of the Free Torsional Icing on Single Conductors of Transmission Lines. Transactions of China Electrotechnical Society, 2024, 39(13): 4079-4089.
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