根据多年来实际工程对钢包精炼炉谐波特性的分析，其产生的谐波电流除整数次谐波较大外，同时含有0.1~30 Hz的低频分量（次谐波）和非基波（50 Hz）频率整数倍的谐波分量（间谐波），仅配置一般的单调谐滤波器不能起到很好的滤波作用，反而会造成某些谐波放大。设置一个C型阻尼滤波器支路，可以拓宽频带，增加阻尼和减少电阻基波功率损耗，实际应用效果明显。%Analysis of harmonic characteristics of ladle furnace in actual projects shows that in addition to high integer harmonics the harmonic current also includes 0.1~30 Hz low-frequency components (sub harmonics) and 50 Hz non-fundamental frequency harmonics of integer multiples (inter-harmonics). In such case, single-tuned filters alone will not only fail to produce good filtering effect but also lead to amplification of some harmonics. Setup of a by-pass with the so-called C-type filter can broaden frequency band, increase damping and re-duce power loss in fundamental frequency, which has brought significant benefit.
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