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防火電纜具有穩定性耐火性

來源:www.vanjashop.com         發布時間:2021-03-11 返回列表
防火電纜具有穩定性耐火性

西藏防火電纜在礦物絕緣電纜中應用的二種材料銅和氧化鎂是無機物。此種電纜不會燃燒,也不會助燃,在接近火焰的條件下仍可繼續操作。銅護套的1083℃下熔融,而氧化鎂絕緣材料則在2800℃下固化。操作溫度高礦物絕緣電纜可耐連續操作溫度高達250℃。但是,在緊急情況下,電纜可在接近銅護套熔點的溫度下,在短時間內繼續操作。壽命長在礦物絕緣電纜中應用的無機材料,可保證電纜具有穩定性、壽命長和耐火性。防爆性礦物絕緣電纜中高度壓實的絕緣材料,可阻止蒸汽、氣體和火焰在與電纜連接的設備零件之間通過。外徑小礦物絕緣電纜的直徑比其他額定電流相同的電纜要小。防水如果將礦物絕緣電纜完全浸在水中,借助其無縫金屬護套,礦物絕緣電纜可繼續操作。


首件檢驗在開始時能夠發現問題,解決問題,制定預防措施,防止批量不合格,起到十分關鍵的作用。例某工人早上開擠出機,加溫的溫度達到了,就開始生產。那么這時就屬于首件檢驗,檢驗擠塑機溫度是不是已經達到規定溫度,可從排出的料的光澤度,有無膠粒,不塑化顆粒等,若有,說明保溫時間不夠,此時開機,勢必會造成質量問題的產生。檢驗工作并不是都依賴專檢人員,質量是需要全員參與的。巡回檢驗是質檢員對車間過程的全數檢驗,認為可對重要工序,材料加強頻率的檢驗,問題的發生都在一瞬間。實例:甲工人在做絞線正常生產時,檢驗員測量導體外徑發現外徑縮小,那么這時檢驗員應該對工藝規程等熟記在心,發揮的時刻到了。外徑變小,造成電阻超標,就應該讓工人停下來,檢查是由于單絲直徑小,還是設備造成的。如果巡回檢驗不及時,也會造成批量不合格。


一般的電纜使用時間久了會發微熱這是很正常的現象,但是如果持續發熱并且熱度不減,這說明這條線路的電流已經超出了容量,要及時采取措施,以免電纜燒壞引發火災。電機引接線電纜發熱的原因有:電機引接線中心在選擇時,地線和接線橫截面積不夠,或者把高壓線跟低壓線混淆使用。在制作的時候電阻過大,銅沒有達到國家標準,電阻會比較大導致發熱。電機引接線的負荷太重,工作時間一長,自然就會持續發熱。絕緣層太厚會使熱量無法散發?;蛘咛]有達到國家標準也會導致使用的時候發熱,有些兩頭粗中間細的電機引接線,其實根本沒達標。

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