這類開(kai)(kai)關柜采用鋼板(ban)制成封(feng)閉(bi)外殼(ke)，進出(chu)(chu)線(xian)回路的(de)(de)(de)電(dian)(dian)器元件都安(an)裝在可(ke)抽(chou)出(chu)(chu)的(de)(de)(de)抽(chou)屜(ti)中(zhong)(zhong)，構成能(neng)完成某一類供電(dian)(dian)任務的(de)(de)(de)功(gong)(gong)能(neng)單元。功(gong)(gong)能(neng)單元與母線(xian)或(huo)(huo)電(dian)(dian)纜(lan)之間(jian)，用接地的(de)(de)(de)金屬板(ban)或(huo)(huo)塑(su)料(liao)制成的(de)(de)(de)功(gong)(gong)能(neng)板(ban)隔開(kai)(kai)，形成母線(xian)、功(gong)(gong)能(neng)單元和電(dian)(dian)纜(lan)三個區(qu)域。每個功(gong)(gong)能(neng)單元之間(jian)也有(you)隔離措施。抽(chou)屜(ti)式(shi)開(kai)(kai)關柜有(you)較(jiao)高的(de)(de)(de)可(ke)靠性(xing)、安(an)全性(xing)和互換性(xing)，是比(bi)較(jiao)先進的(de)(de)(de)開(kai)(kai)關柜，開(kai)(kai)關柜多數(shu)是指(zhi)抽(chou)屜(ti)式(shi)開(kai)(kai)關柜。它們(men)適用于要求(qiu)供電(dian)(dian)可(ke)靠性(xing)較(jiao)高的(de)(de)(de)工礦企業、高層建筑，作為集中(zhong)(zhong)控制的(de)(de)(de)配電(dian)(dian)中(zhong)(zhong)心。

1.主(zhu)母線(xian)最大額定(ding)電(dian)(dian)(dian)(dian)流:主(zhu)母線(xian)最大能(neng)夠承(cheng)載的(de)(de)電(dian)(dian)(dian)(dian)流的(de)(de)額定(ding)值(zhi)(zhi)。2.額定(ding)短時耐受電(dian)(dian)(dian)(dian)流:由生產(chan)廠家給出(chu)的(de)(de),成套設備中(zhong)某條電(dian)(dian)(dian)(dian)路(lu)在(zai)國(guo)家標準(zhun)GB7251.1-2005中(zhong)8.2.3規定(ding)的(de)(de)試驗條件(jian)下能(neng)安全承(cheng)載的(de)(de)短時耐受電(dian)(dian)(dian)(dian)流方均根值(zhi)(zhi)。3.峰值(zhi)(zhi)短時耐受電(dian)(dian)(dian)(dian)流:在(zai)規定(ding)試驗條件(jian)下,生產(chan)廠家規定(ding)此電(dian)(dian)(dian)(dian)路(lu)能(neng)夠圓滿地承(cheng)受的(de)(de)峰值(zhi)(zhi)電(dian)(dian)(dian)(dian)流。4.外殼防護(hu)等(deng)級:IEC60529-1989標準(zhun)由成套設備提供(gong)的(de)(de)防止觸及帶電(dian)(dian)(dian)(dian)部件(jian),以及外來(lai)固體的(de)(de)侵入(ru)和液體的(de)(de)進(jin)入(ru)的(de)(de)等(deng)級。具體等(deng)級劃(hua)分(fen)詳(xiang)見IEC60529標準(zhun)。5.內部分(fen)隔(ge)(ge)方式:根據IEC60529-1989標準(zhun),為(wei)保護(hu)人身安全,將開關柜獨立劃(hua)分(fen)成幾個隔(ge)(ge)室的(de)(de)不同(tong)方式。不同(tong)型(xing)號(hao)的(de)(de)配(pei)電(dian)(dian)(dian)(dian)柜之間的(de)(de)技術參(can)數(shu)都有很(hen)大不同(tong),而進(jin)口(kou)配(pei)電(dian)(dian)(dian)(dian)柜的(de)(de)技術參(can)數(shu)基本(ben)都優于國(guo)產(chan)配(pei)電(dian)(dian)(dian)(dian)柜,但并不能(neng)認(ren)為(wei)進(jin)口(kou)配(pei)電(dian)(dian)(dian)(dian)柜就一定(ding)比國(guo)產(chan)配(pei)電(dian)(dian)(dian)(dian)柜好。

施工用(yong)電(dian)(dian)(dian)配(pei)(pei)電(dian)(dian)(dian)系(xi)統應設(she)置(zhi)總(zong)配(pei)(pei)電(dian)(dian)(dian)箱(xiang)、分(fen)配(pei)(pei)電(dian)(dian)(dian)箱(xiang)、開關(guan)(guan)箱(xiang)，并(bing)按照“總(zong)-分(fen)-開”順序作(zuo)分(fen)級設(she)置(zhi)，并(bing)形(xing)成“三級配(pei)(pei)電(dian)(dian)(dian)”模式。施工用(yong)配(pei)(pei)電(dian)(dian)(dian)系(xi)統各配(pei)(pei)電(dian)(dian)(dian)箱(xiang)、開關(guan)(guan)箱(xiang)的安(an)裝(zhuang)位置(zhi)要合(he)理。總(zong)配(pei)(pei)電(dian)(dian)(dian)箱(xiang)要盡(jin)量靠近(jin)變(bian)壓器(qi)或外電(dian)(dian)(dian)源處(chu)，以便電(dian)(dian)(dian)源的引入。分(fen)配(pei)(pei)電(dian)(dian)(dian)箱(xiang)應盡(jin)量安(an)裝(zhuang)在用(yong)電(dian)(dian)(dian)設(she)備或負(fu)荷相(xiang)對(dui)集中的中心地(di)帶，確保(bao)三相(xiang)負(fu)荷保(bao)持平衡。開關(guan)(guan)箱(xiang)安(an)裝(zhuang)的位置(zhi)應視(shi)現場情況和工況盡(jin)量靠近(jin)其控(kong)制(zhi)的用(yong)電(dian)(dian)(dian)設(she)備。

改進原配電箱的低壓電容器組的接線方式，美式箱變價格將其安裝位置由交流接觸器上樁頭，訂做美式箱變改成(cheng)接在配電(dian)箱低壓進線與計量(liang)表計之(zhi)間。防止因(yin)運(yun)行(xing)中電(dian)容器(qi)電(dian)路發生缺相故障或電(dian)容器(qi)損壞時(shi)，造成(cheng)計量(liang)裝置(zhi)計量(liang)不準確(que)。此外，電(dian)容器(qi)選擇型號應(ying)為BSMJ系(xi)列產(chan)品(pin)，以(yi)保證元件質量(liang)可(ke)靠、安全運(yun)行(xing)。