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。
2
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-extinguishingcoil grounding.