均匀覆冰下的直线塔架空地线覆冰厚度计算模型误差分析  

Analysis of Calculation Model for Overhead Ground Wire Icing Thickness of Straight Tower Under Uniform Icing

作　　者：牛唯 王斌 马晓红[1,3] 李昊 毛先胤 李锐海[2,3] NIU Wei;WANG Bin;MA Xiaohong;LI Hao;MAO Xianyin;LI Ruihai(Electric Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang,Guizhou 550000,China;CSG Electric Power Research Institute Co.,Ltd.,Guangzhou,Guangdong 510663,China;Key Laboratory of Anti-icing and Disaster Reduction of China Southern Power Grid Co.,Ltd.,Guiyang,Guizhou 550000,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550000 [2]南方电网科学研究院有限责任公司,广东广州510663 [3]中国南方电网有限责任公司防冰减灾重点实验室,贵州贵阳550000

出　　处：《广东电力》2021年第10期76-82,共7页Guangdong Electric Power

基　　金：中国南方电网有限责任公司防冰减灾重点实验室支撑项目(GZKJXM20191287)。

摘　　要：覆冰在线监测主要为以称重法为主的力学测量方法,而称重法广泛应用于直线塔架空导线上,针对直线塔架空地线的研究还不足。为研究覆冰在线监测中直线塔架空线路等值覆冰厚度计算模型在地线上的有效性,采取有限元仿真方法分析在大高差大档差、大高差、大档差、非大高差非大档差4种工况下均匀覆冰时架空地线悬垂串的受力和偏斜角大小,并验证直线塔架空线路等值覆冰厚度模型在地线上的适用性。仿真结果表明:在5 mm均匀覆冰时,在大高差大档差工况下等值覆冰厚度计算结果误差达到最大,绝对误差为-1.71 mm,相对误差为-35.3%,相对误差大,但本身冰厚小,绝对误差小;在30 mm均匀覆冰时,在大高差工况下等值覆冰厚度计算结果误差达到最大,绝对误差为-0.98 mm,相对误差为-3.27%。研究结果表明直线塔架空线路等值覆冰厚度模型在地线上的应用是能够反映真实覆冰状况的。It is of great significance performing online monitoring of icing of the overhead ground wire.Online icing monitoring is mainly a mechanical measurement method based on weighing method,which is widely used in overhead phase line of the linear tower,but the research on the overhead ground wire of linear tower is insufficient.In order to study the validity of the equivalent icing thickness calculation model of overhead line on the linear tower in the online icing monitoring,this paper uses the finite element simulation method to analyze the force and deflection angle of the overhead line suspension string under four conditions of large height difference and large span difference,large height difference,large span difference,non large height difference and non large span difference,and verifies the applicability of the equivalent icing thickness model on the ground wire.The results show that when the ice thickness is 5 mm,the error of equivalent ice thickness calculation is the largest under the condition of large height and difference and large span difference,the absolute error is-1.71 mm and the relative error is-35.3%.The relative error is large,but the ice thickness is small,and the absolute error is small.When the ice thickness is 30 mm,the error of equivalent ice thickness calculation is the largest under the large height difference condition.The absolute error is-0.98 mm,and the relative error is-3.27%.It is proved the application of the equivalent icing thickness model on the ground wire can reflect the real icing condition.

关 键 词：覆冰 地线 在线监测 称重法 有限元仿真 

分 类 号：TM753[电气工程—电力系统及自动化] TB115[理学—数学]