直流融冰试验中四分裂导线收缩现象有限元分析  

Finite Element Analysis of Four-Bundle Conductor Shrinkage Phenomenon in DC-based Deicing Experiment

作　　者：黎卫国[1] 郝艳捧[1] 傅闯 

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：《华东电力》2012年第3期392-396,共5页East China Electric Power

基　　金：国家重点基础研究发展计划项目(2009CB724507);教育部中央高校基本科研业务费专项资金资助项目(2011ZG0007)~~

摘　　要：为预防导线粘连带来的危害,研究典型500 kV输电线路四分裂导线在直流融冰试验时的子导线收缩现象,根据3维有限元法对分裂导线LGJ-4×400/35与450 mm×450 mm方型阻尼间隔棒进行实形建模。在温度为-5℃、风速为5 m/s、覆冰厚度为10 mm的环境气候下,直流融冰电流分别为1 000、2 000、3 000、4 000 A的条件下,研究分裂导线和间隔棒的磁场分布,计算单位长度输电导线的电磁力;利用找形分析法建立悬链线模型,在500 m档距内,计算分析了输电导线在覆冰作用下的垂直位移,张力;在60 m最大次档距下,计算分析了覆冰和电磁力共同作用下分裂导线收缩位移;仿真证明了融冰电流在3 000～4 000 A范围内,500kV输电线路四分裂导线出现明显收缩现象。In order to prevent the danger of conductor conglutination,DC-based deicing experiment has been conducted to study the shrinkage phenomenon of the four-bundle conductors in a typical 500 kV transmission line.The threedimension finite element method（FEM） was applied to model on four-bundle LGJ-4 × 400 /35 conductors and square 450 mm × 450 mm spacer-dampers.The magnetic field distributions of the conductors and spacer-dampers were researched, and the electromagnetic force of conductor per unit length was calculated（with-5℃ weather temperature, 5 m/s wind speed,10 mm ice thickness,and 1 000,2 000,3 000,4 000 A DC-based ice-melting current respectively）.ANSYS-based catenary model was established and the vertical displacement and strain of the ice-coated transmission line were calculated within the 500 m span.The conductor shrinkage displacements under the interaction of ice-coating and electromagnetic forces were calculated within the maximal 60 m sub-span.Finally,simulation results verify that four-bundle conductor shrinkage phenomenon in 500 kV transmission line occurs obviously when the DC-based ice-melting current ranges from 3 000 A to 4 000 A.

关 键 词：500KV输电线路 直流融冰 四分裂导线 收缩现象 粘连 有限元法 

分 类 号：TM153[电气工程—电工理论与新技术] TM751