特高压重冰区地线支架脱冰动力响应安全性研究  

Safety of Deicing Dynamic Response for Ground Wire Support of Ultra-high Voltage Transmission Tower in Heavy Ice Area

作　　者：刘翔云 刘泉 李正良[3,4] 何松洋 王超 鄢秀庆 高一然 LIU Xiangyun;LIU Quan;LI Zhengliang;HE Songyang;WANG Chao;YAN Xiuqing;GAO Yiran(Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu 610056,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司,成都610056 [2]国网经济技术研究院有限公司,北京102209 [3]重庆大学土木工程学院,重庆400045 [4]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《建筑钢结构进展》2024年第10期57-65,87,共10页Progress in Steel Building Structures

摘　　要：为了探究特高压重冰区输电塔地线支架在脱冰动力荷载作用下的安全性,基于脱冰数值计算理论,建立了地线的脱冰数值模型和塔线耦合数值模型,研究了地线在不同工况下的脱冰动力响应和不同地线脱冰情况下铁塔地线支架的承载力安全性。脱冰研究表明:地线脱冰时,高差越大,脱冰产生的上拔力越大;档距越大,纵向不平衡张力越大;覆冰越厚,地线脱冰产生的纵向不平衡张力越大,产生的的上拔力越小。塔线耦合脱冰研究表明:多档模型下,地线脱冰时,悬垂直线塔地线支架正面和底部斜材存在应力比超限情况,现有设计方法偏于不安全;耐张塔地线支架不受脱冰动力响应控制。建议重覆冰区地线支架设计时仅考虑地线脱冰产生的上拔力影响,上拔力取地线最大使用张力的1.0%~5.0%,覆冰越厚,上拔荷载可越小,厚度为20 mm、30 mm、40 mm、50 mm、60 mm冰区的上拔荷载分别取为最大使用张力的4.0%~5.0%、3.0%~4.0%、2.5%~3.0%、2.0%~2.5%和1.0%~2.0%。In order to explore the safety of ground wire support of ultra-high voltage(UHV)transmission tower in heavy ice area under the action of deicing dynamic load,based on the deicing numerical theory of computation,the deicing numerical models of two kinds of ground wires and two kinds of tower line coupling numerical models were established.The deicing dynamic response of ground wire under different working conditions and the bearing capacity safety of tower ground wire support under different deicing conditions of ground wire were studied.Research on deicing shows that the greater the height difference,the greater the uplift force generated by deicing;the larger the span,the greater the longitudinal unbalanced tension;the thicker the ice cover,the greater the longitudinal unbalanced tension generated by the ground wire's deicing,and the smaller the uplift force generated by the deicing.Research on tower line coupling deicing shows that under the multi stage model,when the ground wire is deicing,there is a stress ratio exceeding the limit on the front and bottom inclined materials of the suspension tower ground wire support,and existing design methods tend to be unsafe.The tension tower ground wire support is not controlled by the deicing dynamic response.It is recommended to consider only the uplift force generated by the deicing of the ground wire during the design of the ground wire support in the heavy ice-covered area.The uplift force should be taken as 1.0%-5.0%of the maximum working tension of the ground wire.The thicker the ice-covered area,the smaller the uplift load can be.The uplift force can be taken as 4.0%-5.0%,3.0%-4.0%,2.5%-3.0%,2.0%-2.5%and 1.0%-2.0%of the maximum working tension for ice areas with thicknesses of 20 mm,30 mm,40 mm,50 mm and 60 mm,respectively.

关 键 词：输电塔结构 特高压 塔线耦合 脱冰计算理论 地线支架 数值分析 

分 类 号：TM753[电气工程—电力系统及自动化] TM721.1