點擊圖片查看大圖1494V-DH644-A-B-D-E-F現(xiàn)貨
對自有業(yè)務(wù)板塊進(jìn)行騰挪是GE、西門子這些工業(yè)巨頭常用的戰(zhàn)略手段。自我減重是為了讓這些工
業(yè)巨頭更好地前行。從目前來看，減重之后，各大工業(yè)巨頭都將未來發(fā)展的重心聚焦于數(shù)字化工業(yè)。
目前看來，以西門子、GE和ABB為首的三大工業(yè)巨頭在數(shù)字化領(lǐng)域已經(jīng)找準(zhǔn)了自己的戰(zhàn)略方向。在全
球市場上，西門子在深耕專業(yè)領(lǐng)域的基礎(chǔ)之上，借助IT與網(wǎng)絡(luò)技術(shù)為客戶打造數(shù)字化解決方案，不斷
向上延伸；GE更加傾向基于IT與網(wǎng)絡(luò)技術(shù)打造通用平臺，實現(xiàn)橫向拓展；作為后來者，ABB則以下沉
策略形成自下而上的戰(zhàn)略路徑，反撲智能制造市場。
作為工業(yè)互聯(lián)網(wǎng)的實踐者，數(shù)字化是GE未來工業(yè)的重頭戲。在2017年10月25日的“Mind +Machine
”的年度大會上，GE新任CEO弗蘭納里與微軟CEO納德拉（Nadella）聯(lián)合對話中，再次強(qiáng)調(diào)這一戰(zhàn)略
重點不會動搖
長延時過電流脫扣器整定電流應(yīng)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(shù)，一般取1.1；
——線路的計算電流，單臺電動機(jī)是指
電動機(jī)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(jī)進(jìn)行保護(hù)，則電動機(jī)在過載 20％時應(yīng)使保護(hù)裝置動作；
校驗二：在配電線路出現(xiàn)尖峰負(fù)荷時或在電動機(jī)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(xù)時間，也就是線路中大容量的異步電動機(jī)直接起動的持續(xù)時間。
一般情況下，電動機(jī)的輕載起動時間不超過2.5～4s，電動機(jī)滿載起動時間不超過6～8s，個別電動機(jī)重載起動時間達(dá)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(shù)越高，保護(hù)裝置的動作越快。
10.5 低壓斷路器
（5）分?jǐn)嗄芰?br />
1）斷路器額定短路分?jǐn)嗄芰?yīng)大于線路中大短路電流。
2）斷路器的額定極限短路分?jǐn)嗄芰?yīng)大于斷路器額定運(yùn)行短路分?jǐn)嗄芰Γ▽τ谥绷麟娏骶€路，兩者的數(shù)值相同）。分?jǐn)嗄芰κ侵傅蛪簲嗦菲髟谝?guī)定的試驗（如電壓、頻率、線路其它參數(shù)等）條件下，能夠接通成切斷短路電流的數(shù)值。分?jǐn)?br />
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