复合横担塔-线在线路脱冰作用下的振动

ICE-SHEDDING INDUCED VIBRATION OF A COMPOSITE CROSS ARM TOWER-LINE SYSTEM

用复合横担对现有铁塔横担进行技改,借助有限元软件ANSYS建立了技改前后的四跨输变电线路有限元模型,采用改密度法模拟导线覆冰脱冰,分析塔线体系对线路脱冰的动力响应。结果表明:在导线脱冰跳跃时,复合横担塔能够有效增大安全电气距离,可以防止闪络事故,同时选用合适的金具长度可有效减小对其的冲击。

This paper is proposed to analyze the dynamic response of the tower-line system subject to ice shedding. The existing steel cross arms and the improved composite ones are to be analyzed. The before and after improvement of finite element models for a four-span transmission line system are built by ANSYS. The overhead conductor with ice-coating and ice-shedding are simulated by using the modifying density method. The results show that composite cross arm tower can effectively increase electrical safety distance when the conductor jumps with ice shedding and prevent flashover accident. Furthermore,by selecting appropriate length of electrical fittings,the adverse impact of ice shedding on the composite cross arm can be effectively reduced.