变压器直流偏磁对交流励磁的影响

The influence of DC-bias on AC excitation in transformer

为分析变压器直流注入方式对交流励磁的影响,利用三维有限元方法计算单相变压器的直流偏磁问题。以实际电力变压器为例搭建仿真平台,根据其具体参数建立模型,对比分析在原边和副边分别注入直流时变压器的直流偏磁情况。仿真实验结果表明,两种注入方式下交流电流的波形基本相同。

In order to analyze the influence of transformer dc injection mode on AC excitation, this paper calculates the DC bias inf single - phase transformer by three - dimensional finite element. Taking the practical electric power transformer as an example, the simulation platform is established. According to the specific parameters, the model is established to analyze and compare the DC bias in transformer when the dc is injected at the primary side and at the secondary side. The simulation shows that the AC waveforms are almost the same by the two injection modes.