结果表明，U型弧底节流孔具有更大的压降和更高的热力学效率。
It is shown that the U-bottom orifice has higher total pressure drop and (thermodynamic) efficiency.
从塑壳断路器尺寸紧凑、栅片数受限制出发，提出弧柱压降对限流同样起很大作用。
According to the compact geometry along with limited number of deion plates of MCCB, it was proposed that arc column voltage also play an important role in interrupting process of MCCB.
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