描述
如果已知負(fù)載的額定電流IL,計(jì)算斷路器的最高極限額定電流只需把上面的公式變通一下即可,對(duì)于反時(shí)限過載保護(hù),斷路器的最高極限額定電流為:Ir=1/IL=1/0.81≈1.23IL,即已知負(fù)載額定負(fù)載電流的1.23倍,斷路器的最低極限額定電流等于已知負(fù)載的額定電流IL;
對(duì)于定時(shí)限短路保護(hù),斷路器的最高極限額定電流為:Ir=1/IL=1/0.67≈1.49IL,即已知負(fù)載額定負(fù)載電流的1.49倍,斷路器的最低極限額定電流等于已知負(fù)載的額定電流IL。
斷路器額定電流選擇計(jì)算公式是在按預(yù)期的最大負(fù)載電流來選擇斷路器額定電流的基礎(chǔ)上,給出斷路器最低保護(hù)極限電流,選擇原則是負(fù)載的額定電流在斷路器的額定電流至最低保護(hù)極限電流之間的任意值上,這就是選擇斷路器大小的基本原則和依據(jù)。
通過“斷路器額定電流選擇計(jì)算公式”計(jì)算出的斷路器最低保護(hù)極限電流,按此最低保護(hù)極限電流選擇或整定斷路器的額定電流,能保證最小負(fù)載電流時(shí)也在斷路器的安全保護(hù)動(dòng)作范圍之內(nèi),使斷路器真正起到安全保護(hù)的作用。
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