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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。
Based on the detailed analysis of the three-phase current asymmetry of excitation transformer, the similarities and differences of excitation transformer output current asymmetry caused by excitation voltage source asymmetry and synchronous loop fault are contrasted and verified by simulation When the excitation voltage source is asymmetric, the excitation transformer output current one phase becomes larger, while the other two phases become smaller; and synchronous circuit is not normal, the excitation transformer output current is one phase smaller, the other two phases either become larger or a The phase change is large while the other phase is almost constant. This conclusion has practical guiding significance for analyzing the cause of asymmetrical current in the excitation system.