配電變壓器的低壓側總過流保護熔斷器的額定電流，變壓器應大于配電變壓器的低壓側額定電流，訂做變壓器一般(ban)取(qu)額(e)定(ding)(ding)電(dian)流(liu)(liu)(liu)的(de)1.5倍，熔(rong)體(ti)的(de)額(e)定(ding)(ding)電(dian)流(liu)(liu)(liu)應按變壓(ya)器(qi)(qi)(qi)允許的(de)過負(fu)荷(he)倍數和熔(rong)斷(duan)器(qi)(qi)(qi)特性(xing)確定(ding)(ding)。出(chu)線回路過流(liu)(liu)(liu)保護熔(rong)斷(duan)器(qi)(qi)(qi)的(de)熔(rong)體(ti)額(e)定(ding)(ding)電(dian)流(liu)(liu)(liu)，不(bu)應大于總過流(liu)(liu)(liu)保護熔(rong)斷(duan)器(qi)(qi)(qi)的(de)額(e)定(ding)(ding)電(dian)流(liu)(liu)(liu)，熔(rong)體(ti)的(de)額(e)定(ding)(ding)電(dian)流(liu)(liu)(liu)按回路正(zheng)常最大負(fu)荷(he)電(dian)流(liu)(liu)(liu)選(xuan)擇，并應躲過正(zheng)常的(de)尖峰(feng)電(dian)流(liu)(liu)(liu)。

配電(dian)箱是按電(dian)氣接線(xian)要求將開關(guan)設(she)備、測量(liang)(liang)儀(yi)表(biao)，保護電(dian)器(qi)和(he)輔助(zhu)(zhu)設(she)備組裝(zhuang)在封閉或(huo)半封閉金屬柜中或(huo)屏幅上，構成低壓配電(dian)箱。正常運(yun)行(xing)(xing)(xing)時(shi)可借(jie)助(zhu)(zhu)手(shou)動(dong)或(huo)自動(dong)開關(guan)接通(tong)或(huo)分斷(duan)電(dian)路。故障(zhang)或(huo)不正常運(yun)行(xing)(xing)(xing)時(shi)借(jie)助(zhu)(zhu)保護電(dian)器(qi)切斷(duan)電(dian)路或(huo)報警。借(jie)測量(liang)(liang)儀(yi)表(biao)可顯(xian)示運(yun)行(xing)(xing)(xing)中的各種參(can)數(shu)，還可對某(mou)些電(dian)氣參(can)數(shu)進行(xing)(xing)(xing)調整，對偏離正常工(gong)作(zuo)狀態進行(xing)(xing)(xing)提示或(huo)發出信號。

控(kong)(kong)(kong)制柜主要用于高(gao)層建筑無(wu)(wu)塔供水(shui)，消(xiao)防深井泵(beng)恒(heng)壓(ya)供水(shui)等根據實時用水(shui)工況需要閉環(huan)調(diao)節水(shui)泵(beng)轉速的(de)場合，采用知名品牌的(de)變頻器、智能控(kong)(kong)(kong)制器、壓(ya)力(li)(li)傳感(gan)器及水(shui)泵(beng)組(zu)成閉環(huan)控(kong)(kong)(kong)制系(xi)統(tong)。多泵(beng)控(kong)(kong)(kong)制，管(guan)網壓(ya)力(li)(li)穩定(ding)，提高(gao)供水(shui)質量，減少二(er)次污染，節電效率高(gao)，可(ke)實現無(wu)(wu)人值守(shou)的(de)無(wu)(wu)塔供水(shui)自動控(kong)(kong)(kong)制系(xi)統(tong)。

這種(zhong)復合(he)材(cai)(cai)(cai)料(liao)(liao)由兩部(bu)分組成:基(ji)體—聚(ju)酯(zhi)類樹(shu)脂；增(zeng)強(qiang)材(cai)(cai)(cai)料(liao)(liao)（簡稱PC、SMC)，所以又稱其為(wei)透明PC材(cai)(cai)(cai)料(liao)(liao)、纖維(wei)增(zeng)強(qiang)的(de)聚(ju)酯(zhi)材(cai)(cai)(cai)料(liao)(liao)。透明PC材(cai)(cai)(cai)料(liao)(liao)、纖維(wei)增(zeng)強(qiang)型不(bu)飽和聚(ju)酯(zhi)是一種(zhong)以不(bu)飽和聚(ju)酯(zhi)樹(shu)脂為(wei)基(ji)體的(de)復合(he)材(cai)(cai)(cai)料(liao)(liao)。這兩種(zhong)材(cai)(cai)(cai)料(liao)(liao)具有不(bu)溶、阻(zu)燃可回(hui)收(shou)特點，后一種(zhong)材(cai)(cai)(cai)料(liao)(liao)具有不(bu)熔(rong)不(bu)可回(hui)收(shou)利用(yong)弊(bi)端其物理結構為(wei)三維(wei)網狀(zhuang)結構，這四種(zhong)材(cai)(cai)(cai)料(liao)(liao)通過功(gong)能性填料(liao)(liao)改性及特種(zhong)纖維(wei)的(de)增(zeng)強(qiang)已(yi)成為(wei)一種(zhong)高(gao)性能的(de)工程材(cai)(cai)(cai)料(liao)(liao)。