输电线路单导线自由扭转覆冰动态仿真研究  

Simulation Study of the Free Torsional Icing on Single Conductors of Transmission Lines

作　　者：杨国林 蒋兴良[1] 廖乙 胡建林[1] 张志劲[1] Yang Guolin;Jiang Xingliang;Liao Yi;Hu Jianlin;Zhang Zhijin(Xuefeng Mountain Energy Equipment Safety National Observation and Research Station Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学雪峰山能源装备安全国家野外科学观测研究站,重庆400044

出　　处：《电工技术学报》2024年第13期4079-4089,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51637002)。

摘　　要：输电线路冰灾长期威胁电网安全稳定运行,结合输电线路实际覆冰情况,建立准确的输电线路覆冰增长模型对电网冰灾防御具有重要意义。但现有的输电线路覆冰增长模型多忽略了输电线路自由扭转覆冰过程。该文基于野外自然环境下输电线路单导线自由扭转覆冰的观测结果,建立了反映导线自由扭转覆冰动态过程的仿真分析模型。在重庆大学雪峰山能源装备安全国家野外科学观测研究站开展GJ50导线自由扭转覆冰实验,将实验结果与数值仿真结果进行对比分析。结果表明:导线扭转角度和单位覆冰质量沿单导线中心点对称分布;仿真获得的导线覆冰形状与实际情况吻合;导线扭转角度和单位覆冰质量仿真值与测量值误差平均值均在10%以内。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 a

关 键 词：单导线 扭转覆冰 数值仿真 野外实验验证 

分 类 号：TM85[电气工程—高电压与绝缘技术]