配電(dian)(dian)變(bian)壓(ya)器(qi)(qi)的(de)低壓(ya)側總過流保(bao)護(hu)(hu)熔(rong)(rong)斷(duan)(duan)器(qi)(qi)的(de)額(e)(e)定(ding)電(dian)(dian)流，應(ying)大(da)(da)于配電(dian)(dian)變(bian)壓(ya)器(qi)(qi)的(de)低壓(ya)側額(e)(e)定(ding)電(dian)(dian)流，一般取(qu)額(e)(e)定(ding)電(dian)(dian)流的(de)1.5倍(bei)，熔(rong)(rong)體(ti)的(de)額(e)(e)定(ding)電(dian)(dian)流應(ying)按變(bian)壓(ya)器(qi)(qi)允許的(de)過負荷(he)倍(bei)數和熔(rong)(rong)斷(duan)(duan)器(qi)(qi)特性確定(ding)。出線回(hui)路(lu)過流保(bao)護(hu)(hu)熔(rong)(rong)斷(duan)(duan)器(qi)(qi)的(de)熔(rong)(rong)體(ti)額(e)(e)定(ding)電(dian)(dian)流，不(bu)應(ying)大(da)(da)于總過流保(bao)護(hu)(hu)熔(rong)(rong)斷(duan)(duan)器(qi)(qi)的(de)額(e)(e)定(ding)電(dian)(dian)流，熔(rong)(rong)體(ti)的(de)額(e)(e)定(ding)電(dian)(dian)流按回(hui)路(lu)正常最大(da)(da)負荷(he)電(dian)(dian)流選擇，并應(ying)躲(duo)過正常的(de)尖峰電(dian)(dian)流。

這類開關(guan)(guan)(guan)柜(ju)采用鋼板制(zhi)成(cheng)(cheng)封閉外殼，進出(chu)線(xian)回路的(de)電器(qi)元件都安裝在(zai)可抽(chou)(chou)出(chu)的(de)抽(chou)(chou)屜(ti)中(zhong)(zhong)，構成(cheng)(cheng)能完(wan)成(cheng)(cheng)某一類供電任務的(de)功(gong)(gong)(gong)能單(dan)元。功(gong)(gong)(gong)能單(dan)元與母(mu)線(xian)或電纜之間，用接地的(de)金屬板或塑料制(zhi)成(cheng)(cheng)的(de)功(gong)(gong)(gong)能板隔(ge)開，形成(cheng)(cheng)母(mu)線(xian)、功(gong)(gong)(gong)能單(dan)元和(he)電纜三(san)個區域。每個功(gong)(gong)(gong)能單(dan)元之間也有(you)隔(ge)離措施。抽(chou)(chou)屜(ti)式開關(guan)(guan)(guan)柜(ju)有(you)較高的(de)可靠(kao)性(xing)、安全性(xing)和(he)互(hu)換性(xing)，是(shi)比較先進的(de)開關(guan)(guan)(guan)柜(ju)，開關(guan)(guan)(guan)柜(ju)多數是(shi)指抽(chou)(chou)屜(ti)式開關(guan)(guan)(guan)柜(ju)。它(ta)們適用于要求供電可靠(kao)性(xing)較高的(de)工礦企(qi)業、高層(ceng)建(jian)筑(zhu)，作為集中(zhong)(zhong)控(kong)制(zhi)的(de)配(pei)電中(zhong)(zhong)心。

1.高壓開關柜配電柜廠家向用戶推薦自己生產的也許并不適合用戶的產品。2.東川高壓開關柜設(she)計院(yuan)對(dui)(dui)某些(xie)新推出的(de)柜型并不太(tai)了(le)解只是(shi)根(gen)據用(yong)戶要求進行設(she)計。3.用(yong)戶對(dui)(dui)自(zi)己的(de)需(xu)求并不十分了(le)解,選擇(ze)柜型時(shi)不能根(gen)據自(zi)己所需(xu)進行選擇(ze)。

在(zai)一條距離比較(jiao)長(chang)的線(xian)路上有多根小(xiao)面(mian)積(ji)電纜(lan)(lan)往(wang)往(wang)會造成電纜(lan)(lan)使(shi)用(yong)(yong)(yong)浪費，于是在(zai)出線(xian)到用(yong)(yong)(yong)電負荷中，往(wang)往(wang)使(shi)用(yong)(yong)(yong)主干大電纜(lan)(lan)出線(xian)，然后在(zai)接近(jin)負荷的時候，使(shi)用(yong)(yong)(yong)電纜(lan)(lan)分(fen)支箱將主干電纜(lan)(lan)分(fen)成若干小(xiao)面(mian)積(ji)，電纜(lan)(lan)，由小(xiao)面(mian)積(ji)電纜(lan)(lan)接入負荷。這(zhe)樣的接線(xian)方(fang)式廣(guang)泛用(yong)(yong)(yong)于城市電網(wang)中的路燈等供電、小(xiao)用(yong)(yong)(yong)戶(hu)供電。