The measuring method of the frequency characteristic of harmonic losses in convertor transformers is presented. The measuring results in a convertor transformer are given and are analyzed.

介绍了一种实际测量换流变压器谐波损耗频率特性的方法，给出了在一台换流变压器上的实际测量结果。

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In frequency analysis of rotating arc signal, the phase of harmonic characteristic reflects the initial Angle between weld direction and seam's direction.

在旋转电弧信号的频域分析中，其特征谐波的相位反映了焊缝方向与焊接方向的初始夹角。

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So harmonic current should be suppressed firstly rather than harmonic voltage. The harmonic characteristic on the network side and the ac side of medium-frequency power supply is analyzed.

分析了电网侧和中频电源交流侧的谐波特性，并针对中频电源提出了几种谐波抑制措施。

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