冰风荷载作用下架空线路脱冰跳跃风险评估方法  

Risk Assessment Method for Overhead Line After Ice-shedding Under Ice and Wind Loads

作　　者：陈易飞 阳林[1] 郝艳捧[1] 李立浧[1] 黄欢 毛先胤 黄胜 CHEN Yifei;YANG Lin;HAO Yanpeng;LI Licheng;HUANG Huan;MAO Xianyin;HUANG Sheng(School of Electrical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;Electrical Power Research Institute of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,Guizhou,China;Liupanshui Power Supply Bureau of Guizhou Power Grid Co.,Ltd.,Liupanshui 553000,Guizhou,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [3]贵州电网有限责任公司六盘水供电局,贵州六盘水553000

出　　处：《电力大数据》2024年第1期1-9,共9页Power Systems and Big Data

基　　金：南方电网有限责任公司防冰减灾重点实验室支撑项目(GZKJXM20222180);南方电网公司关键核心技术攻关项目(066600KK52190063);广东省基础与应用基础研究基金项目(2019A1515012122)。

摘　　要：本文提出了一种用于评估架空线路在冰风荷载作用下脱冰风险的方法。通过仿真获取不同脱冰模式下的竖向冰跳高度、横向摆幅和端部动态张力的变化数据,进而计算输电线路相间最小间隙、冲击倍数、悬垂线夹最大不平衡张力及耐张绝缘子串的安全系数。结合这些参数,定量分析了放电、断线、线夹损害和绝缘子串损坏的风险,并输出了综合风险评估结果。此外,本研究引入阶跃函数来模拟脱冰和风荷载,提出了计算脱冰线路最小相间隙的新方法。以中国南方某110kV架空线路为例,验证了该方法的有效性。结果显示,C相导线脱冰导致张力大幅下降,竖向跳跃高度和横向摆幅分别达1.84m和11.6m,耐张串和悬垂线夹的不平衡张力分别高达44kN和85kN,暴露出电气和力学方面的风险。该评估与实际事故相符,证明了方法的准确性。The risk assessment method for ice-shedding of overhead lines under ice and wind loads was proposed in this paper.Firstly,the variation data of vertical jump height,lateral swing and dynamic tension at the end of the transmission line are obtained under different ice-shedding modes.Secondly,the minimum inter-phase clearance of ice-shedding transmission lines,impact coefficient,the maximum unbalanced tension of suspension clamp and safety coefficient for the mechanical strength of the tension insulator strings are calculated.Then,the risk of transmission line discharge,wire breakage,damage to suspension clamps,and damage to tension insulator strings are analyzed and the risk assessment results of ice-shedding transmission lines are output.The method of simulating ice-shedding load and instantaneous wind load by using step function is proposed.The calculation method of the minimum inter-phase clearance of ice-shedding transmission line under ice and wind load is put forward.The 110 kV overhead line in southern China is taken as an example to verify the effectiveness of the proposed risk assessment method.The results show that the dynamic tension at the end of the conductor decreases quickly when the iceshedding occurs from the C-phase conductor of the 110 kV transmission line,and the maximum vertical jump height and the maximum lateral swing of the C-phase conductor are 1.84 m and 11.6 m,respectively.The maximum unbalance tensions at the end of the tension strings and at the end of the suspension clamps are 44 kN and 85 kN,respectively.There are both electrical and mechanical risks in the transmission line at this time.The results of the risk assessment are consistent with the results of the actual accidents,which verifies the accuracy of the proposed risk assessment method.

关 键 词：覆冰 脱冰跳跃 输电线路 风险评估 有限元仿真 

分 类 号：TM75[电气工程—电力系统及自动化]