复合横担塔-线在线路脱冰作用下的振动
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摘要
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.
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.
引文
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[12]吴昊,孙珍茂,刘勇.复合横担在1000 kV特高压交流输电双回路铁塔中的应用探讨[J].电力与能源,2018,39(1):45-62.
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[2]刘和云.架空导线覆冰与脱冰机理研究[D].武汉:华中科技大学,2001.
[3]李庆峰,范峥,吴穹,等.全国输电线路覆冰情况调研及事故分析[J].电网技术,2008,32(9):33-36.
[4]左玉玺,薛更新,孙强,等. 750 k V输电线路复合横担设计研究[J].电网与清洁能源,2013,29(1):1-8.
[5]孙涛,赵雪灵,高理迎,等.特高压直流线路复合材料转动横担设计[J].电力建设,2014,35(9):35-38.
[6]傅鹏程,邓洪州,吴静.输电塔结构动力特性研究[J].特种结构,2005,22(3):47-49.
[7]沈世钊,徐崇宝,赵臣.悬索结构设计[M].北京:中国建筑工业出版社,2006.
[8]郭应龙,李国兴,龙传永.输电线路舞动[M].北京:中国电力出版社,2002.
[9]尹鹏,李黎,张行.输电线路脱冰跳跃反应控制研究[J].电网与水力发展进展,2008,24(3):3-7.
[10]侯锚,王黎明,朱普轩.特高压线路覆冰脱落跳跃的动力计算[J].中国电机工程学报,2008,28(6):1-6.
[11]鲁元兵,楼文娟,李焕龙.输电导线不均匀脱冰的全过程模拟分析[J].振动与冲击,2010,29(9):47-49.
[12]吴昊,孙珍茂,刘勇.复合横担在1000 kV特高压交流输电双回路铁塔中的应用探讨[J].电力与能源,2018,39(1):45-62.
[13]杨建平.架空输电线路钢管塔结构[M].北京:中国电力出版社,2011:144-174.
[14]刘汉立.复合材料输电杆塔的研究与应用[J].纤维复合材料,2011(1):15-17.
[15]张玥,谢强,何畅,等.特高压复合支柱绝缘子力学性能试验研究[J].南方电网技术,2017,11(11):27-33.