Surge suppressor and low-order harmonic filter can improve power supply quality.

利用浪涌抑制器和低次谐波滤波装置，可有效改善供电质量。

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If the stator inside winding is out of order, we must consider the influence of the harmonic wave with low orders or fraction orders when calculating the air space inductance values.

如在定子绕组内部故障情况下，气隙电感量的计算必须考虑低次和分数次谐波的影响。

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Large amplitudes of cables can be induced by low order frequency harmonic oscillations. Then, some destructive accidents will happen, and some efficient control methods will be needed.

缆索结构系统在外部激励作用下将产生低频谐振，会导致大的振幅而可能有破坏性事故发生，故需要一种有效的方法控制这种振动。

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