1370-DBH75現貨
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長延時過電流脫扣器整定電流應大于線路中計算電流
(4-10-9)
式中 ——過電流脫扣器的長延時動作整定電
流值,A;
——可靠系數,一般取1.1;
——線路的計算電流,單臺電動機是指
電動機的額定電流,A。
10.5 低壓斷路器
校驗一:長延時過電流脫扣器在配電線路過載時的可靠性。如對電動機進行保護,則電動機在過載 20%時應使保護裝置動作;
校驗二:在配電線路出現尖峰負荷時或在電動機起動時,長延時過電流脫扣器不誤動。脫扣器在3倍整定電流值下的可返回時間,取決于線路中尖峰電流的持續時間,也就是線路中大容量的異步電動機直接起動的持續時間。
一般情況下,電動機的輕載起動時間不超過2.5~4s,電動機滿載起動時間不超過6~8s,個別電動機重載起動時間達15s。返回時間越小,說明線路電流大于長延時脫扣器整定電流值的倍數越高,保護裝置的動作越快。
10.5 低壓斷路器
(5)分斷能力
1)斷路器額定短路分斷能力應大于線路中大短路電流。
2)斷路器的額定極限短路分斷能力應大于斷路器額定運行短路分斷能力(對于直流電流線路,兩者的數值相同)。分斷能力是指低壓斷路器在規定的試驗(如電壓、頻率、線路其它參數等)條件下,能夠接通成切斷短路電流的數值。分斷
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1370-DBH75
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