153H-F201FBD-51-1-8B-SEL現(xiàn)貨
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式中 ——瞬時或短時過電流脫扣器整定電流值,A;
——可靠系數(shù),對動作時間大于0.02s的斷路器,K
取1.35,對動作時間小于0.02s的斷路器K取
1.7~2.0;
——電動機(jī)的起動電流,A。
10.5 低壓斷路器
2)當(dāng)配電線路不考慮電動機(jī)的起動電流時,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)配電線路考慮電動機(jī)的起動電流時,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)的自起動電機(jī)
的起動電流的總和,A。
10.5 低壓斷路器
(3)短時過電流脫扣器的整定電流
確定本級斷路器短延時過電流脫扣器動作電流的整定,應(yīng)與下一級開關(guān)整定電流選擇性配合。本級動作整定電流應(yīng)大于或等于下一級低壓斷路器短延時或瞬時動作整定值的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)長延時過電流脫扣器整定電流
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153H-F201FBD-51-1-8B-SEL
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153H-F201FBD-51-1-8B-SEL
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153H-F201FBD-51-1-8B-SEL
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