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(2)額定電流
斷路器的額定電流與過電流脫扣器的額定電流應大于線路計算負荷電流。當按線路的計算電流選擇時,應能滿足下式:
(4-10-6)
式中 ——低壓斷路器的額定電流,A;
——線路的計算電流或?qū)嶋H電流,A。
如果環(huán)境溫度低于+40℃,則電器產(chǎn)品溫度每低1℃,允許電流比額定電流值增加0.5%。但增加總數(shù)不得超過20%。
10.5 低壓斷路器
斷路器的保護定值
(1)長延時脫扣器的電流整定值,動作時間可以不小于10s;長延時脫扣器只能作過載保護。
(2)短延時脫扣器的電流整定值,動作時間約為0.1~0.4s;短延時脫扣器可以作短路保護,也可以作過載保護。
(3)瞬時脫扣器的電流整定值,其動作時間約為0.02s。瞬時脫扣器一般用作短路保護。
10.5 低壓斷路器
(3)瞬時過電流脫扣器的整定電流
瞬時脫扣器的動作時間為0.02s左右。
瞬時或短時過電流脫扣器的整定電流應能躲開線路的尖峰電流。
1)負載是單臺電動機,整定電流按下式計算
(4-10-7)
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