【摘要】 为研究新型铅金属减震器对高压电气设备动力特性的影响,对安装该减震器前后500kV氧化锌避雷器采用单输入单输出(SISO)方法进行了动力特性试验和有限元分析。试验结果表明:安装新型铅减震器前后500kV氧化锌避雷器的基频在1～10Hz之间且相差很小,振型基本一致;反映了设备整体刚度较小,新型铅金属减震器基本没有改变设备的频率和振型。安装新型铅金属减震器后500kV氧化锌避雷器的阻尼比比原来增大了近3倍,说明这种减震器是以提供设备附加阻尼的方式实现减震控制的。新型铅金属减震器可使避雷器支持瓷套根部应变减少46%以上且可以明显降低其顶部的加速度和位移。有限元分析结果表明:安装新型铅减震器前后500kV氧化锌避雷器的振型以水平振型为主,竖向振型和扭转振型不明显。更多还原

【Abstract】 In order to find out dynamic behaviors of the 500 kV zinc oxide arresters with and without a new type of lead damper,the dynamic behavior experiment and finite element analysis are carried out by means of single point input and single point output(SISO)measurement.The results of dynamic behavior experiment show that the primary frequencies of these two structures are between 1 Hz and 10 Hz and the difference between these two primary frequencies is not obvious,indicating that the overall stiffness of the two structures is low.The frequency of these two structures has hardly changed by the lead dampers,but the damping ratio of the arresters with the dampers is increased nearly 3 times,thus the fashion of vibration-reduction control of the dampers is to provide additional damping to the equipments.Owning to increment of damping device with the new type of lead dampers,there is an above reduction of 46% in the maximum stress of bottom porcelain pipe and the new type lead dampers can also decrease the relative displacement at the top of bushing.The results of finite element analysis show that the level modes of the 500 kV zinc oxide arresters with and without the new type of lead dampers are main modes and the vertical modes and torsional modes are not obvious.更多还原