摘要
目前,有关导线脱冰和风振同时出现的输电线路脱冰研究成果较少,输电塔-线体系导线风振对脱冰的影响更是鲜有报道。为此,采用有限元瞬态动力学分析方法,搭建某500 kV实际运行线路的塔-线体系有限元模型;通过动态仿真分析了当导线均匀覆冰10 mm时,不同风速下导线脱冰的动力学响应特性,并分别从导线位移、导线应力和杆塔两侧导线的不平衡张力3个方面探讨了导线风振对脱冰的影响。结果表明,导线水平振幅随着风速的增大而迅速增大;导线竖直振幅、导线最大拉应力以及杆塔两侧导线的不平衡张力随风速的增大而略有减少。因此,在实际工程应用中,若计及水平位移对输电线路的影响,则需要考虑导线风振对脱冰的影响。
The influence of wind vibration in transmission tower-line system on ice shedding is rarely reported. Hence, we established a tower-line system finite-element model of a practical operating 500 kV line using a finite element transient dynamics analysis method. With the model, we made dynamic simulative analyses of dynamic response characteristics of the ice shedding line coated with 10 mm uniform ice under different wind speeds, and discussed the effects of wind vibra- tion on ice shedding from three aspects： line displacement, stress, and unbalanced tension on both sides of tower. The results show that, while wind speed increases, a line＇s horizontal vibrating amplitude rapidly increases, but its vertical vi- brating amplitude, maximum stress, and maximum unbalanced tension on both sides of tower slightly decrease. Therefore, if taking the influence of horizontal displacement into consideration in a practical engineering application, we should also take the effect of wind vibration on ice shedding into account.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第2期381-387,共7页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724502)
输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512711207)~~
关键词
输电线路
塔一线体系
风振
脱冰
覆冰
有限元
transmission line
tower-line system
wind vibration
ice shedding
icing
finite element
