不均匀覆冰下连续档架空输电线路脱冰动力响应分析

杨春侠; 何雯琦; 刘慧聪; 崔鸿知; 张梓建

doi:10.3724/j.gyjzG23012603

不均匀覆冰下连续档架空输电线路脱冰动力响应分析

doi: 10.3724/j.gyjzG23012603

长沙理工大学土木工程学院, 长沙 410000

基金项目:

国家自然科学基金项目(51678067)。

详细信息

作者简介:
杨春侠,博士,副教授,主要从事结构可靠性理论、结构抗震等方面研究。

通讯作者:
何雯琦,硕士研究生,hwqiii516@163.com。

计量
- 文章访问数: 30
- HTML全文浏览量: 8
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2023-01-26
- 网络出版日期: 2025-10-24

Dynamic Response Characteristics of Ice-Shedding on Multi-Span Transmission Lines Under Non-Uniform Icing Conditions

College of Civil Engineering, Changsha University of Science and Technology, Changsha 410000, China

摘要

摘要: 为研究不均匀覆冰对导线脱冰动力响应的影响,建立连续三档绝缘子串-导线体系有限元模型,定义覆冰段位置、覆冰段长度以及基本覆冰厚度3个特征参数以表征不均匀覆冰工况特性,分析非均匀覆冰导线在不同覆冰特性和线路参数下的脱冰跳跃动力响应,研究各参数对最大冰跳幅值和最大不平衡张力的影响规律。结果表明:脱冰档总覆冰量相同时,相对于均匀覆冰,非均匀覆冰导线会产生更剧烈的脱冰响应;不均匀覆冰段的最不利位置与档距大小有关,当脱冰档档距小于等于700 m时,不均匀覆冰段的位置越靠近跨中,导线的脱冰跳跃高度和不平衡张力越大。当脱冰档档距大于700 m时,覆冰段位置中点和左侧挂点的水平距离与档距之比为0.3时更不利。
- 输电线路 /
- 脱冰跳跃 /
- 不均匀覆冰 /
- 动力响应 /
- 最不利工况
Abstract: A finite element model of the insulator-string-conductor system was established to investigate the influence of uneven ice-coating on the dynamic responses of iced transmission lines subjected to ice-shedding. Three parameters of ice section location, ice section length, and basic ice thickness were defined to characterize the non-uniform ice-coating conditions. The ice-shedding dynamic responses of non-uniformly iced conductors under different icing characteristics and line parameters were analyzed. Furthermore, the influence law of each parameter on the maximum ice-jump amplitude and the maximum unbalanced tension was studied. The numerical results showed that for the same total ice load on the ice-shedding span, non-uniformly iced conductors generated more severe ice-shedding responses compared to uniformly iced conductors; the most unfavorable position of the non-uniformly iced segment was related to the span length. When the ice-shedding span was 700 m or less, the closer the position of the non-uniformly iced segment was to the mid-span, the greater the conductor’s jump height and unbalanced tension became. When the length of ice-shedding span exceeded 700 m, the condition became more unfavorable if the ratio of the horizontal distance (between the midpoint of the iced segment and the left suspension point) to the span length was 0.3.
- transmission lines /
- ice-shedding jumping /
- non-uniform icing /
- dynamic response /
- most unfavorable case

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