FLEXOMATIC 90
FLEXOMATIC 90
FLEXOMATIC 90
《聯(lián)系人；歐先生》
電線電纜生產(chǎn)企業(yè)都會遇到電線斷路或短路的現(xiàn)象，這做情況對企業(yè)質(zhì)量檢測部門是非常頭痛的事情。有的企業(yè)有電線電纜檢測故障儀，有的沒有要用現(xiàn)有設(shè)備把故障點找到需要簡單適用的計算方法，這里介紹此電線電纜故障計算方法，雖然在以前電纜報上看到過這里也提出我們查找斷點和短路的思路。
斷路：電容方法計算L=UX*S／P，（L為斷線距離，S為電纜長度；UX測量端斷線工作電容）。這種方法測量結(jié)果與實際斷線點差距相當大，浪費了人力物力。
短斷：計算電阻這種方法是L=A*S/（A+B），（L為斷線距離，S為電纜長度；A、B測量端短路線電阻）這種方法是現(xiàn)在電纜企業(yè)最有效的方法但也存在著電阻測量精度問題。
經(jīng)過不斷地對事故分析和總結(jié)，我們發(fā)現(xiàn)電線斷路有一個規(guī)律表現(xiàn)明顯的就是市話線、成對或成組的電線等。就是我們測的斷路電容要比正常單線電容要大，而正常線的電容沒有多大的變化都非常接近，斷路電容大其是也是必然的，不管我們測的是A端還是B端測量都是和地或是正常線對，這樣就存在不僅是一對還有地和其它線對的耦合電容。
這里介紹斷路計算公式1：
L=SQRT（UA*（U-UB））/（SQRT（UA*（U-UB））+SQRT（UA*（U-UB）））
斷路計算公式2：
L=（（UA+（U-UB））/（2*U））*S
兩式中：L——電纜A端至斷點長度，mS——電纜全長，m
UA——為A端測斷線電容，pFUB——B端測斷線電容pF
U——正常線電容，pF
這兩種方式第一種計算方法誤差范圍要比第二種方法小得多，但需要過程中長期的測量。第一種方法是普遍使用的方法。這里要說明的是測量固有誤差仍不可避免的。
除有公式計算外，還可以利用現(xiàn)有設(shè)備進行查找，所需設(shè)備：工頻火檢機，通用型數(shù)字萬用表。用這種方法找斷點需要前提條件的，如果線帶屏蔽的話最好用工式計算，如果沒帶屏蔽那用工頻火檢機利用電感找斷點誤差點幾乎為零。
方法：利用計算公式計算出大概位置，然后測量電線外護套厚度，假如外護套厚度為0.8mm那么工頻火檢電壓升到5kV，（這里掌握個原則火檢電壓升多少，要看萬用表電感強弱不能太大防止燒表）電線兩端線芯絕緣和護套削皮。以工頻火檢機為中心一端接數(shù)字萬用表紅表筆接斷線，黑表筆接其余所有線。另一端把所有芯線扭在一起接地，測量兩端的電感數(shù)。如A端電感電壓為100，B端為60的話。那么B端斷點沒有過火檢機，利用這種方法我們可以找到的斷點非常精確，只要斷點經(jīng)過火檢機數(shù)字萬用表顯示的數(shù)字為無窮大。那么斷點就在進線口。
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