500kV输电线路跳线风偏有限元分析与试验研究

Finite element analysis and experimental study on wind-induced swing of 500 kV transmission line jumper wire

为了解输电线路跳线的风偏特性,以指导跳线的合理布置,从而减少由跳线风偏引起的闪络跳闸事故的发生,对某500 kV输电线路的跳线进行有限元风振响应分析和风洞试验研究。首先,运用时域有限元分析方法对500 kV输电线路跳线的风振响应进行分析,研究了不同风速、不同风向角以及加装悬垂绝缘子串对跳线风偏特性的影响。然后,基于相似性理论制作了500 kV输电线路跳线的气弹模型,开展了风洞试验并与有限元分析结果进行对比验证。结果表明:输电线路跳线的风偏位移随风速和风向角的增大而增大,与风速呈正比例函数关系;随着风向角的增大,跳线风偏角的增大幅度减小;加装悬垂绝缘子串可有效抑制跳线风偏。分析得到的输电线路跳线风偏结果可为跳线的风致振动理论研究以及实际输电线路建设提供依据。

In order to investigate the wind-induced swing characteristics of the transmission line jumper wire to guide the reasonable arrangement of jumper wire and reduce flashover trip accidents caused by the wind-induced swing of jumper wire,the finite element wind vibration response analysis and wind tunnel test for the jumper wire of a 500 kV transmission line were carried out.Firstly,using the timedomain finite element analysis method,the wind vibration response of the 500 kV transmission line jumper wire was analyzed,and the influences of different wind speeds,different wind direction angles and the installation of suspension insulator string on the wind-induced swing characteristics of the jumper wire were studied.Then,based on the similarity theory,an aeroelastic model of 500 kV transmission line jumper wire was developed.The wind tunnel test was carried out and the results were compared with the finite element analysis results.The results showed that the wind-induced swing displacement of the jumper wire increased with the increase of wind speed and wind direction angle,which presented a direct proportional function relation with the wind speed.With the increase of wind direction angle,the increase amplitude of wind-induced swing angle of the jumper wire decreased.The installation of suspended insulator string could effectively inhibit the wind-induced swing of the jumper wire.The analysis results of the wind-induced swing of transmission line jumper wire can provide a basis for the theoretical study of wind-induced vibration of jumper wires and the actual construction of transmission lines.