封(feng)閉母線(xian)耐火性(xing)能的選擇

封閉(bi)母(mu)線(xian)(xian)(xian)可分為兩種，一(yi)種是密集(ji)絕緣母(mu)線(xian)(xian)(xian)，其載(zai)(zai)流量(liang)大，但不耐高溫。只能(neng)(neng)在(zai)200℃下工作，一(yi)般安裝在(zai)市電(dian)的(de)輸(shu)電(dian)線(xian)(xian)(xian)路(lu)上(shang)。另一(yi)種是空氣絕緣母(mu)線(xian)(xian)(xian)，能(neng)(neng)承受高溫，在(zai)環境溫度700-1000℃的(de)前提(ti)下，能(neng)(neng)維持1.5小時的(de)輸(shu)電(dian)運(yun)行。它的(de)載(zai)(zai)流量(liang)很大，可以達到5000A。這種封閉(bi)母(mu)線(xian)(xian)(xian)又(you)稱(cheng)耐火(huo)(huo)(huo)封閉(bi)母(mu)線(xian)(xian)(xian)。防(fang)(fang)火(huo)(huo)(huo)封堵(du)母(mu)線(xian)(xian)(xian)與(yu)密集(ji)封堵(du)母(mu)線(xian)(xian)(xian)的(de)區別(bie)在(zai)于殼體(ti)部。防(fang)(fang)火(huo)(huo)(huo)封堵(du)母(mu)線(xian)(xian)(xian)的(de)外殼涂(tu)有一(yi)層防(fang)(fang)火(huo)(huo)(huo)涂(tu)料，而密集(ji)封堵(du)母(mu)線(xian)(xian)(xian)表面噴塑，光滑，與(yu)防(fang)(fang)腐層附著力(li)強。