IC693ACC311

IC693ACC311

IC693ACC311

三相变压器励磁涌流有以下特点：

（1）由于三相电压之间有120°的相位差，所以无论任何情况下空载投入变压器，至少在两相中要出现不同程度的励磁涌流。

（2）某相励磁涌流可能不再偏离时间轴的一侧，变成了对称性涌流。其他两相仍为偏离时间轴一侧的非对称性涌流。对称性涌流的数值比较小，非对称性涌流含有大量的非周期分量，但对称性涌流中无非周期性分量。

（3）三相励磁涌流中有一相或两相二次谐波含量比较小，但至少有一相比较大。

（4）励磁涌流的波形仍然是间断的，但间断角显著减小，其中又以对称性涌流的间断角小，但对称性涌流的正向大值与反向大值之间的相位差（波宽）为120°，而稳态电流波宽为180°。

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