XL-21型低壓(ya)動力配(pei)電(dian)(dian)(dian)箱(xiang)系封閉式,外殼用鋼板彎制而成,刀開(kai)關操(cao)作手柄于(yu)(yu)箱(xiang)前(qian)右柱上部,可以作為(wei)切(qie)換電(dian)(dian)(dian)源(yuan)之(zhi)用。配(pei)電(dian)(dian)(dian)箱(xiang)前(qian)面裝有一只電(dian)(dian)(dian)壓(ya)表,指示(shi)匯(hui)流母(mu)線(xian)的(de)電(dian)(dian)(dian)壓(ya)。配(pei)電(dian)(dian)(dian)箱(xiang)前(qian)面有門(men),門(men)打開(kai)后,配(pei)電(dian)(dian)(dian)箱(xiang)內全部設備(bei)敞露、便(bian)于(yu)(yu)檢修維護。本(ben)配(pei)電(dian)(dian)(dian)箱(xiang)均采用國(guo)內自行設計的(de)型組件,具(ju)有結構緊湊,檢修方便(bian),線(xian)路(lu)(lu)方案可以靈(ling)活組合等特(te)點。配(pei)電(dian)(dian)(dian)箱(xiang)除裝有空氣斷(duan)路(lu)(lu)器和熔斷(duan)器作為(wei)短(duan)路(lu)(lu)保(bao)護外,還裝有接觸(chu)器和熱繼電(dian)(dian)(dian)器,箱(xiang)前(qian)門(men)可裝操(cao)作按鈕和指示(shi)燈。
正常使(shi)用環境
◆環境(jing)溫度(du):-50℃~+40℃,且24H內的平(ping)均溫度(du)不超過+36℃;
◆海拔高(gao)度:不超過2000m;
◆相對濕(shi)度:在周圍(wei)空(kong)氣濕(shi)度為+40℃時不(bu)超過(guo)50%;在較(jiao)低濕(shi)度下可以(yi)有較(jiao)高的相對濕(shi)度(如:+20℃時為90%),考慮 到溫(wen)度的變化允許產生(sheng)適度的凝(ning)霜(shuang):
◆設備(bei)安裝時與垂直面的傾斜度應不超過5°,設備(bei)應安裝在無(wu)劇烈震動、無(wu)沖(chong)擊及無(wu)腐蝕的場所。