摘要
特高压直线塔地线金具多次因不均匀覆冰发生事故。首先采用不平衡张力的数值计算模型,并给出张力初始值的取值方法和收敛判断条件。然后计算分析了特高压输电线路不同档距、档数、高差、冰厚、串长、大小档等多种情况时直线塔地线的不平衡张力。结果表明减少耐张段档数、缩小档距、降低高差、路径选择中尽量避开冰区较重的地方、增加地线悬垂串长度、排位时尽量使档距均匀分布等均可降低直线塔地线的不平衡张力。对新建工程和已建工程,分别提出了降低地线不平衡张力差的对策,可为后续特高压输电线路的设计提供参考。
There are many accidents associated with the fittings on ground wire for UHV suspension tower under uneven icing.Firstly,a numerical calculation model of unbalance tension is used,and the determining methods of initial tension value and convergence judgment conditions are given.Then the influence of different parameters on the unbalance tension of the ground wire is compared and analyzed,such as span length,span number,height difference,icing thickness,string length,and large and small span.The results show that the unbalance tension of the ground wire can be lowered by using the methods of reducing the span number of strain section,the span length and height difference,keeping away heavy ice area,increasing the string length,realizing the uniform distribution of the span length,and so on.The countermeasures to reduce the unbalance tension difference of the ground wire are put forward for new projects and built projects respectively.
作者
胡海洋
张欢
伍晓红
张颖
张恒
张亮
马金燕
HU Haiyang;ZHANG Huan;WU Xiaohong;ZHANG Ying;ZHANG Heng;ZHANG Liang;MA Jinyan(Beijing Electric Power Economic and Technology Research Institute Co.,Ltd.,Beijing 100107,China;School of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《智慧电力》
北大核心
2023年第2期118-123,共6页
Smart Power
基金
国家自然科学基金资助项目(51978570)。
关键词
特高压输电线路
直线塔
地线不平衡张力
降低张力差
UHV transmission line
suspension tower
ground wire unbalanced tension
reducing tension difference
