直流偏磁对变压器振动的影响

针对偏磁下变压器异常振动的问题,分析了变压器铁芯和绕组振动的机理,建立了基于电—磁—结构力学多物理场耦合的变压器铁芯和绕组综合振动的三维模型,并通过仿真和试验进行对比验证。结果表明,偏磁下磁通密度正负半周期分布不平衡,且随着偏磁的增强,磁通密度最值增大,铁芯和绕组的振动加剧;变压器的三维模型和所采用的分析方法具有较高的精度,对变压器的优化设计提供了依据。

Research on Vibration of Transformers under DC Bias

In view of the problem of transformer abnormal vibration under biased magnetic field, the mechanism of transformer core and winding vibration was analyzed. And then a three-dimensional model of transformer core and winding comprehensive vibration was established based on multi-physical field coupling of electro-magnetic-structural mechanics. The model was verified by simulation and experiment. The results show that the positive and negative half-period distribution of flux density is unbalanced under biased magnetic field; With the increase of biased magnetic field, the maximum value of flux density increases, and the vibration of iron core and winding intensifies. The three-dimensional model of transformer and the adopted analysis method have high accuracy, which provides a basis for optimal design of transformer.