风速对架空输电线路导线脱冰跳跃的影响

摘要

In view of the problem of few research achievements of ice shedding of power transmission lines considering of ice shedding of conductors and pulse wind load at the same time at present,finite element transient dynamics analysis method was used for establishing finite element model for tower line system of 500 kV running lines.Harmonic superposition method was used to simulate pulse wind speed time history.Simulation analysis was carried out for dynamics response characteristic of ice shedding of conductors under conditions of 10 mm icing thickness of conductors and considering of influence of wind speed.In aspects of jumping height of the conductor,stress of the conductor and unbalanced tension,affect on ice shedding by pulse wind speed was discussed.Results indicate that jumping height,stress and unbalanced tension of the conductor is slightly decreased compared with that under the condition of no wind.%鉴于目前同时考虑导线脱冰和脉动风荷载的输电线路脱冰研究成果较少,采用有限元瞬态动力学分析方法,建立了500 kV 实际运行线路的塔线体系有限元模型；使用谐波叠加方法模拟了导线高度处脉动风速时程；通过仿真分析了导线覆冰厚度为10 mm,考虑脉动风速影响下的导线脱冰的动力学响应特性,并分别从导线跳跃高度、导线应力和导线不平衡张力三方面探讨脉动风速对脱冰的影响。结果表明,考虑脉动风速影响时导线跳跃高度、导线应力及不平衡张力相比无风情况下略有减小。