±800 kV换流变压器-套管体系的抗震性能

Seismic Behavior of ±800 kV UHV Converter Transformer and Bushing System

为研究±800 kV特高压换流变压器抗震性能,依据某工程中的换流变压器,通过精细化有限元分析,计算了该设备在地震作用下关键部位的位移、应力以及加速度响应,分析了其器箱壁、箱壁升高座以及套管升高座对套管的动力特性以及放大系数的影响。结果表明,特高压换流变压器在地震作用下,套管竖向位移响应明显,顶部竖向位移达387 mm。套管根部加速度、位移及顶部位移放大系数存在较大差异,3者比值为1：2.18：0.55。另外,在地震波反应谱平台段内,套管根部加速度放大系数均大于规范推荐值2。箱壁及升高座能降低套管频率,增大其地震响应;套管顶部位移较大,可能造成设备间牵拉破坏;套管应力、加速度及位移放大系数不一致,在单独考核套管抗震性能时应分别考虑。

To investigate the seismic performance of ±800 kV UHV converter transformer, we adopted FEM analysis on an UHV converter transformer to analyze and obtain the displacements, stresses, and accelerations of the critical parts. Moreover, we analyzed the influences of the dynamic properties of bushings and the amplification factors of transformer tank, turrets on the tank plate and turrets of the bushings. The results indicate that the vertical response of the transformer is large and reaches to 387 mm. The amplification factors of the acceleration and the stress at the bottom and the displacement at the top of the bushing are different, and the ratio of them is 1：2.18：0.55. Moreover, the acceleration amplification factor is greater than the value recommended by corresponding standard in the plateau part of the earthquake response spectra. The frequency of bushing is decreased and the responses are amplified by turrets and transformer tank. The top displacement of bushing is remarkable, and the amplification factors of stress, acceleration, and displacement are much different, which should be concerned in evaluating the seismic performance of the bushings.