塔线体系脱冰不平衡张力影响因素分析

摘要

Ice-shedding can cause sharp tension change of the conductor and produce greater tension differences,which can easily cause serious electrical or mechanical accident of transmission lines.Therefore,an ice-shedding vibration mechanical model of conductors is established by the finite element transient dynamic method to analyze the influence factors of ice-shedding unbalanced tensions and to reveal the influence characteristics of various parameters on the unbalanced tensions.The results show that the unbalanced tension of ice-shedding increases with the increase of icing thickness,ice-shedding spans,ice-shedding rates and height differences of mutation;the unbalanced tension of ice-shedding tends to stabilize with the increase of the number of continuous spans;within a certain span,the unbalanced tension of ice-shedding decreases with the increase of suspended insulator length;and different ice-shedding modes has significant impacts on the unbalanced tension.The related research results can provide a reference for the subsequent structure design and formulation of scientific and reasonable ice melting and deicing measures.%导线脱冰会引起导线张力剧烈变化,产生较大的张力差,容易对输电线路造成严重的电气或机械事故.为此利用有限元瞬态动力学方法,建立导线脱冰跳跃力学模型,对脱冰不平衡张力的多个影响因素进行分析,揭示各参数对不平衡张力的影响规律.结果表明:导线脱冰不平衡张力随覆冰厚度、脱冰档档距、脱冰量、突变高差的增加而增加;导线脱冰不平衡张力随连续档数的增加而趋于稳定;当档距一定时,导线脱冰不平衡张力随悬垂绝缘子串长度的增加而减小;脱冰方式的不同对不平衡张力的影响较大.相关成果可为后续线路结构设计以及制定科学合理地除冰融冰措施提供借鉴作用.