介绍了同步变压器在IG BT串联技术中的应用及其设计方法，并给出了实验和仿真结果。

The application of synchronous transformer to IGBT serial technology and its design method are introduced. The experimental and simulating results are presented.

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经仿真实验表明：该方案能准确地判别出变压器内部故障和励磁涌流，不受系统谐波影响，具有很高的可靠性。

The simulation tests show that the new method can correctly judge the transformer's inrush current and internal fault without the harmonic effect, and it has a good reliability.

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电力变压器故障诊断的仿真实验结果表明，利用该分类方法可以提高数据分类的精确性。

The result of simulative experiment for power transformers fault diagnosis shows that the method can overcome the before-mentioned shortcomings and improve the accuracy of data classification.

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