基于多场耦合的变压器偏磁振动建模与仿真分析

Modeling and Simulation Analysis of DC Bias Vibration of Transformer Based on Multi-field Coupling

变压器受偏磁影响时振动异常剧烈,基于变压器电磁力场耦合方式,采用有限元仿真与振动测试技术深入研究了变压器铁芯和绕组的偏磁振动特性。首先对变压器铁芯和绕组的电磁场数学模型进行推导,建立直流偏磁条件下的振动模型。然后将推导的数学模型应用到变压器振动分析的多场耦合建模中,以一次侧电压变量作为激励,仿真分析不同直流偏磁铁芯、绕组的机械响应情况。仿真结果与实测结果对比分析,验证了提出的变压器偏磁振动的多场耦合分析方法的有效性。

When the transformer is affected by the DC bias, the vibration is extremely severe.Based on the coupling mode of the electromagnetic field of the transformer, the three-dimensional simulation and vibration testing technology are used to study the polarization characteristics of the transformer core and winding.Firstly, the electromagnetic field mathematical model for DC bias vibration analysis of the transformer core and winding is developed, and the vibration model under DC bias is established.Then, the mathematical model is applied into the multi-physical field coupling modeling for vibration analysis of the transformer.Using primary voltage as excitation and under different DC bias, vibrations of the transformer core and winding is simulated and analyzed with the primary side voltage variable as the excitation.Comparative analysis of simulating and experiment test results show that the proposed DC bias vibration analysis method of the transformer core and winding based on multi-field coupling is effective.