一、直(zhi)流屏一般用在什(shen)么地(di)方

直流屏是(shi)直(zhi)流(liu)電(dian)(dian)源(yuan)(yuan)操作(zuo)(zuo)系(xi)統的簡稱，通(tong)用(yong)名為(wei)(wei)智能(neng)免維護直(zhi)流(liu)電(dian)(dian)源(yuan)(yuan)屏，通(tong)用(yong)型號(hao)為(wei)(wei)GZDW。它的主(zhu)要功能(neng)是(shi)把交流(liu)電(dian)(dian)轉化為(wei)(wei)直(zhi)流(liu)電(dian)(dian)。電(dian)(dian)廠和變電(dian)(dian)站中的電(dian)(dian)力(li)操作(zuo)(zuo)電(dian)(dian)源(yuan)(yuan)現今采用(yong)的都是(shi)直(zhi)流(liu)電(dian)(dian)源(yuan)(yuan)，它為(wei)(wei)控制負(fu)荷和動力(li)負(fu)荷以及直(zhi)流(liu)事(shi)故照明負(fu)荷等提供電(dian)(dian)源(yuan)(yuan)，是(shi)當代(dai)電(dian)(dian)力(li)系(xi)統控制、保護的基礎。

直流屏的應用范圍主要包括：新建或需要改造(zao)的各類發電(dian)(dian)廠(chang)、水電(dian)(dian)站；10KV、35KV、110KV、220KV、500KV等(deng)各類變電(dian)(dian)站；為高壓開關、繼電(dian)(dian)保護、應急(ji)燈(deng)光照明等(deng)提(ti)供(gong)控(kong)制電(dian)(dian)源(yuan)和操作電(dian)(dian)源(yuan)；可(ke)用于、冶金、石化(hua)、電(dian)(dian)氣化(hua)鐵(tie)(tie)路等(deng)需要220V（110V）直流(liu)電(dian)(dian)源(yuan)的場(chang)合；通信、鐵(tie)(tie)路交(jiao)換(huan)局、電(dian)(dian)信、農話、移(yi)動基站，接入網等(deng)場(chang)合提(ti)供(gong)直流(liu)電(dian)(dian)，電(dian)(dian)壓等(deng)級一般為DC48V或者DC24V。

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二、直流屏的工作原理

直流屏電(dian)(dian)(dian)(dian)(dian)力操(cao)作(zuo)電(dian)(dian)(dian)(dian)(dian)源系統由(you)交(jiao)流配(pei)電(dian)(dian)(dian)(dian)(dian)部(bu)(bu)分(fen)(fen)、整流部(bu)(bu)分(fen)(fen)、直流饋電(dian)(dian)(dian)(dian)(dian)部(bu)(bu)分(fen)(fen)、監(jian)控部(bu)(bu)分(fen)(fen)組(zu)成(cheng)。其中交(jiao)流配(pei)電(dian)(dian)(dian)(dian)(dian)部(bu)(bu)分(fen)(fen)主(zhu)要(yao)由(you)交(jiao)流配(pei)電(dian)(dian)(dian)(dian)(dian)單(dan)元(yuan)組(zu)成(cheng)。整流部(bu)(bu)分(fen)(fen)由(you)充電(dian)(dian)(dian)(dian)(dian)模塊和隔離(li)二極管組(zu)成(cheng)。直流饋電(dian)(dian)(dian)(dian)(dian)部(bu)(bu)分(fen)(fen)由(you)降(jiang)壓硅鏈(lian)、絕緣檢測、合閘分(fen)(fen)路和控制分(fen)(fen)路組(zu)成(cheng)，監(jian)控部(bu)(bu)分(fen)(fen)由(you)監(jian)控模塊和配(pei)電(dian)(dian)(dian)(dian)(dian)監(jian)控組(zu)成(cheng)。

系統交(jiao)(jiao)(jiao)流輸入正常時，兩路(lu)交(jiao)(jiao)(jiao)流輸入經(jing)交(jiao)(jiao)(jiao)流切換控(kong)制電(dian)路(lu)選擇其中一路(lu)輸入，并通過交(jiao)(jiao)(jiao)流配電(dian)單元給各個充(chong)電(dian)模塊供電(dian)。充(chong)電(dian)模塊將(jiang)三相交(jiao)(jiao)(jiao)流電(dian)轉換為220V或110V的(de)直(zhi)流，經(jing)隔離(li)二極管隔離(li)后并聯輸出(chu)，一方面(mian)給電(dian)池充(chong)電(dian)，另一方面(mian)通過合閘分(fen)路(lu)和控(kong)制分(fen)路(lu)給負載提供正常的(de)直(zhi)流電(dian)源(yuan)。

交(jiao)流輸入(ru)停電(dian)(dian)或異常時，充(chong)電(dian)(dian)模塊停止工作，由電(dian)(dian)池通過合(he)閘分路(lu)和(he)控(kong)制分路(lu)給負載供電(dian)(dian)。交(jiao)流輸入(ru)恢復正常以后，充(chong)電(dian)(dian)模塊對電(dian)(dian)池充(chong)電(dian)(dian)。