The principle of arc-suppression coil with three phases and five columns , and theory of power frequency extinguishing arcing were introduced.

介绍了三相五柱式消弧线圈的工作原理，单相电弧接地过电压的工频熄弧理论。

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Taking the hydro-generator for the Three Gorges power plant as an example, this paper expounds it is very necessary for large_capacity hydro-generator to adopt arc-extinguishing coil grounding.

以三峡水轮发电机为例，阐述了大型水轮发电机中性点经消弧线圈接地的必要性。

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