励磁变压器电流不对称原因分析

在详细分析励磁系统中励磁变压器三相电流不对称原因的基础上，对比了由励磁电压源不对称和同步回路故障引起的励磁变压器输出电流不对称的异同，并用仿真的方法进行了验证，即当励磁电压源不对称时，励磁变压器输出电流一相变大，而其他两相变小；而同步回路不正常时，励磁变压器输出电流是一相变小，其他两相或者都变大或者一相变大而另一相几乎不变。这一结论对于分析励磁系统电流不对称原因具有实际的指导意义。

Causes of the Asymmetry of the Output Currents of the Excitation Transformer

The causes of the asymmetry of the output currents of excitation transformer are studied, The difference between the asymmetrical excitation voltage source and the synchronization circuit fault is compared in details and verified by the MATLAB simulations. When the excitation voltage source is asymmetrical, one of the output currents of the excitation transformer increases and the other two decrease; when the synchronization circuit is faulty, one of the output currents of the excitation transformer decreases and the other two increase or one increases and the other is nearly unchanged. This result is useful for guiding the further analysis of the asymmetrical output currents of the excitation transformer.