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式中 ——瞬時(shí)或短時(shí)過電流脫扣器整定電流值，A；
——可靠系數(shù)，對動(dòng)作時(shí)間大于0.02s的斷路器，K
取1.35，對動(dòng)作時(shí)間小于0.02s的斷路器K取
1.7～2.0；
——電動(dòng)機(jī)的起動(dòng)電流，A。
10.5 低壓斷路器
2）當(dāng)配電線路不考慮電動(dòng)機(jī)的起動(dòng)電流時(shí)，按下式計(jì)算整定值
（4-10-8）
式中 ——配電線路的尖峰電流，A；
——可靠系數(shù)，一般取1.35。
3）當(dāng)配電線路考慮電動(dòng)機(jī)的起動(dòng)電流時(shí)，按下式計(jì)算整定值
（4-10-9）
式中 ——正常工作電流和可能出現(xiàn)的自起動(dòng)電機(jī)
的起動(dòng)電流的總和，A。
10.5 低壓斷路器
（3）短時(shí)過電流脫扣器的整定電流
確定本級斷路器短延時(shí)過電流脫扣器動(dòng)作電流的整定，應(yīng)與下一級開關(guān)整定電流選擇性配合。本級動(dòng)作整定電流應(yīng)大于或等于下一級低壓斷路器短延時(shí)或瞬時(shí)動(dòng)作整定值的1.2倍。若下一級有多條分支線，則取各分支路低壓斷路器中大整定值的1.2倍。
10.5 低壓斷路器
（4）長延時(shí)過電流脫扣器整定電流
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