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黄颜色是流入变压器初级绕组的电流波形，是异常的。
正常的电流应该是0增加到Imax然后到0然后再到-Imax再到0.
而现在电流波形是-Imax到Imax到0再到Imax再到-Imax再到0.
为什么呢？
