The winding current harmonic content of converter transformer in operation is rich. However, affected by harmonics, the radial vibration characteristics are quite different from the power transformer, structural loosening and deformation caused by winding vibration are more prominent. Therefore, in view of the influence of current harmonics on axial and radial vibrations, this study builds a 3D winding electromagnetic vibration finite element simulation model, analyses the components and contents of current harmonics, compares the leakage flux and vibration distribution under the fundamental, harmonic and superimposed currents. The correlation relationship between the harmonic components and axial and radial vibration characteristics is obtained, and the vibration measurement test of ±800 kV converter transformer in operation is carried out to verify the correctness of the analysis method. The results show that the winding radial vibration amplitude will exceed the axial vibration affected by harmonics. More importantly, under the superposition of the fundamental, 5th and 7th harmonic current, the vibration contribution of the converter transformer tank is mainly radial vibration, and the vibration dominant frequency is shifted from 100 Hz under the fundamental current to 400 Hz.

中文翻译：

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电流谐波作用下换流变压器绕组轴向和径向电磁振动特性

换流变压器运行中绕组电流谐波含量丰富。但受谐波影响，其径向振动特性与电力变压器有较大差异，绕组振动引起的结构松动和变形更为突出。因此，针对电流谐波对轴向和径向振动的影响，本文建立了三维绕组电磁振动有限元仿真模型，分析了电流谐波的组成和内容，比较了基波、谐波下的漏磁通和振动分布。和叠加电流。得到谐波分量与轴向、径向振动特性之间的相关关系，并进行了±800 kV换流变压器运行中的振动测量试验，验证了分析方法的正确性。结果表明，受谐波影响，绕组径向振动幅值将超过轴向振动。更重要的是，在基波、5次、7次谐波电流叠加下，换流变压器油箱的振动贡献主要为径向振动，振动主频率从基波电流下的100 Hz偏移到400 Hz。