不均匀覆冰下的架空地线覆冰在线监测力学计算模型改进  

Research on Improvements in the Mechanical Calculation Model of On-line Icing Monitoring of Overhead Ground Wires Under Uneven Icing

作　　者：王斌 李立浧[1] 魏发生 阳林[1] 郝艳捧[1] 王俊锞 WANG Bin;LI Licheng;WEI Fasheng;YANG Lin;HAO Yanpeng;WANG Junke(School of Electric Power,South China University of Technology,Guangzhou 510640,China;Electric Power Research Institute of China Southern Power Grid,Guangzhou 510080,China)

机构地区：[1]华南理工大学电力学院,广州510640 [2]南方电网科学研究院有限责任公司,广州510080

出　　处：《高电压技术》2022年第11期4538-4545,共8页High Voltage Engineering

基　　金：广东省基础与应用基础研究基金项目(2019A1515012122);中国南方电网有限责任公司科技项目(GZKJXM20191287)。

摘　　要：针对目前不均匀覆冰下直线塔地线等值覆冰厚度计算模型研究的不足,对南方地区线路等值覆冰厚度计算模型进行改进,提出一种考虑悬垂串偏斜的直线塔地线等值覆冰厚度计算模型。通过有限元仿真研究大高差大档差、大高差、大档差、非大高差非大档差4种工况下不均匀覆冰对悬垂串偏斜的影响。为了验证改进后直线塔地线等值覆冰厚度计算模型的适用性,以平均等效覆冰厚度为理论值对比模型改进前后等值冰厚计算结果的误差。结果表明:平均等效覆冰厚度小于10 mm时,在4种工况下南方地区线路等值覆冰厚度计算模型在地线上均有较好的适用性;平均等效覆冰厚度大于10 mm时,在4种工况下南方地区线路等值覆冰厚度计算模型等值冰厚计算结果相对误差分别为47.14%、50.70%、73.33%、99.41%,考虑悬垂串的偏斜角后的改进模型等值冰厚计算结果相对误差分别减小至6.42%、6.13%、9.27%、13.39%,改进后的直线塔地线等值覆冰厚度计算模型能够大大减小等值冰厚计算结果误差。In view of the deficiency of the current calculation model of equivalent icing thickness of suspension tower ground wire under uneven icing,this paper improves the calculation model of equivalent icing thickness of suspension tower in South China,and proposes a calculation model of equivalent icing thickness of suspension tower ground wire considering the deflection of suspension string.The influences of uneven icing on the deflection of suspension string under four working conditions,such as,high elevation discrepancy span and large span,high elevation discrepancy span,large span non high elevation discrepancy span and non large span,are studied by finite element simulation.In order to verify the applicability of the improved model,the errors of the calculated results of equivalent icing thickness before and after the model are compared with the theoretical value of the average equivalent icing thickness.The results show that the equivalent icing thickness calculation model before improvement is suitable under four conditions when the average equivalent icing thickness is less than 10 mm.When the average equivalent icing thickness is more than 10 mm,the relative errors of the calculation model of the equivalent icing thickness before improvement under four conditions are 47.14%,50.70%,73.33%,and 99.41%,respectively.The relative error of the improved model after considering the deflection angle of the suspension string is reduced to 6.42%,6.13%,9.27%and 13.39%.The improved model can greatly reduce the error of the calculation results.

关 键 词：不均匀覆冰 在线监测 地线 有限元仿真 直线塔 

分 类 号：TM752[电气工程—电力系统及自动化]