不同工况下输电线路导线长度变化规律研究  

Study on length variation of transmission line under different conditions

作　　者：宋云海[1] 孙萌[1] 姚钊泓 王奇[1] 周震震[1] 尚佳宁 李妍红[3] 张武英 傅思 郝艳捧[2] 唐明 阳林[2] SONG Yunhai;SUN Meng;YAO Zhaohong;WANG Qi;ZHOU Zhenzhen;SHANG Jianing;LI Yanhong;ZHANG Wuying;FU Si;HAO Yanpeng;TANG Ming;YANG Lin(China Southern Power Grid EHV Transmission Company Maintenance Test Center,Guangdong 510663,Chirm;South China University of technology,Guangdong 510641,China;Guangzhou Power Supply Bureau Co.Ltd.,Guangdong 510610,China;City Cloud Technology Co.Ltd,Hangzhou 310053,China)

机构地区：[1]中国南方电网超高压输电公司检修试验中心,广州510663 [2]华南理工大学,广州10641 [3]中国南方电网广州供电局有限公司,广州510610 [4]城云科技有限公司,杭州310053

出　　处：《自动化与仪器仪表》2019年第7期212-215,共4页Automation & Instrumentation

摘　　要：导线覆冰力学计算模型用于计算输电线路等值覆冰厚度,导线长度是该模型的重要基础参数之一。自然界中导线面临复杂气象环境,导线长度随温度或荷载变化而改变,研究导线长度变化规律对改进覆冰力学计算模型具有重要意义。本文选取三种常用的110kV^500kV钢芯铝合金绞线,分别其在温度(-20~70℃)、覆冰(0~20mm)、大风(0~25m/s)、覆冰与大风等四种不同工况下的导线长度变化率。计算结果表明,大温差与一般风速(<10m/s)引起的导线长度变化分别不超过0.15%和0.8%可忽略不计。轻微覆冰对导线长度影响较小,但随着覆冰增加,其影响显著增强。且覆冰增大了导线的受风面积,使风荷载的影响增大。在覆冰计算模型中应充分考虑覆冰与大风对导线长度伸长的影响,使覆冰计算结果更加精确。The calculation model of icethickness is used to calculate the equivalent ice thickness coating on transmission line,and the length of the conductoris is one of the important basic parameters.The conductoris faced with various complicated working conditions in nature,and the temperature or the load variationwill change the length of the line.It is of great significance to study the length variation of the transmission line for establishing the mechanical calculation model of icethickness.In this paper,three Aluminium-alloy Conductor Steel-reinforced applying in 110 kV^500 kV transmission lineare is selected to study their length variations under four different conditions,such as large temperature difference,heavyice,high wind,heavyice and high wind condition.The calculation results show that the lengthvariation caused by the large temperature difference and the ordinary wind is not more than 0.15% and 0.8%,respectively,which can be neglected.On the contrary,the heavy ice has a great influence on the length of the line,and the ice increases the wind receiving area of the conductor,so that the influence of the wind load increases.In the calculation model of ice thickness,the influence of heavy ice and high wind on the length variation should be fully considered to make calculation result of equivalent ice thickness more accurate.

关 键 词：输电线路 长度变化 覆冰工况 大风工况 覆冰计算模型 

分 类 号：TM930[电气工程—电力电子与电力传动]