一、直流屏(ping)一般用在什么地方
直流屏是(shi)直(zhi)(zhi)流(liu)電(dian)(dian)(dian)源(yuan)操(cao)作系(xi)統的(de)簡稱,通用名為智能免(mian)維護直(zhi)(zhi)流(liu)電(dian)(dian)(dian)源(yuan)屏,通用型(xing)號為GZDW。它的(de)主要(yao)功能是(shi)把交流(liu)電(dian)(dian)(dian)轉化(hua)為直(zhi)(zhi)流(liu)電(dian)(dian)(dian)。電(dian)(dian)(dian)廠和(he)變(bian)電(dian)(dian)(dian)站中的(de)電(dian)(dian)(dian)力(li)操(cao)作電(dian)(dian)(dian)源(yuan)現今(jin)采用的(de)都(dou)是(shi)直(zhi)(zhi)流(liu)電(dian)(dian)(dian)源(yuan),它為控(kong)制負(fu)荷和(he)動(dong)力(li)負(fu)荷以及直(zhi)(zhi)流(liu)事故照明負(fu)荷等(deng)提供電(dian)(dian)(dian)源(yuan),是(shi)當(dang)代電(dian)(dian)(dian)力(li)系(xi)統控(kong)制、保(bao)護的(de)基礎(chu)。
直流屏的應用范圍主要包括:新建或需要改(gai)造的各類(lei)發電(dian)(dian)(dian)廠、水電(dian)(dian)(dian)站;10KV、35KV、110KV、220KV、500KV等(deng)各類(lei)變電(dian)(dian)(dian)站;為高壓開關、繼電(dian)(dian)(dian)保護、應(ying)急燈光照明等(deng)提供控制(zhi)電(dian)(dian)(dian)源和操(cao)作電(dian)(dian)(dian)源;可用于、冶金(jin)、石化、電(dian)(dian)(dian)氣(qi)化鐵路等(deng)需要220V(110V)直(zhi)(zhi)流電(dian)(dian)(dian)源的場合;通(tong)信、鐵路交換局、電(dian)(dian)(dian)信、農話、移動基站,接入網(wang)等(deng)場合提供直(zhi)(zhi)流電(dian)(dian)(dian),電(dian)(dian)(dian)壓等(deng)級一般為DC48V或者DC24V。
二、直流屏的工作原理
直流屏電力操作電源系統(tong)由交流配(pei)(pei)電部分(fen)(fen)(fen)、整流部分(fen)(fen)(fen)、直(zhi)流饋(kui)電部分(fen)(fen)(fen)、監(jian)控部分(fen)(fen)(fen)組(zu)成(cheng)。其中交流配(pei)(pei)電部分(fen)(fen)(fen)主要由交流配(pei)(pei)電單元(yuan)組(zu)成(cheng)。整流部分(fen)(fen)(fen)由充(chong)電模塊(kuai)和隔(ge)離二極管組(zu)成(cheng)。直(zhi)流饋(kui)電部分(fen)(fen)(fen)由降壓硅鏈、絕緣檢測、合閘分(fen)(fen)(fen)路(lu)和控制分(fen)(fen)(fen)路(lu)組(zu)成(cheng),監(jian)控部分(fen)(fen)(fen)由監(jian)控模塊(kuai)和配(pei)(pei)電監(jian)控組(zu)成(cheng)。
系(xi)統交(jiao)(jiao)流(liu)輸(shu)入(ru)正常時,兩(liang)路交(jiao)(jiao)流(liu)輸(shu)入(ru)經交(jiao)(jiao)流(liu)切換控制(zhi)電(dian)(dian)路選擇其中一(yi)路輸(shu)入(ru),并通(tong)過交(jiao)(jiao)流(liu)配電(dian)(dian)單元給各個充(chong)(chong)電(dian)(dian)模塊(kuai)供(gong)電(dian)(dian)。充(chong)(chong)電(dian)(dian)模塊(kuai)將三相(xiang)交(jiao)(jiao)流(liu)電(dian)(dian)轉(zhuan)換為220V或110V的(de)直流(liu),經隔離(li)二極管隔離(li)后并聯輸(shu)出,一(yi)方(fang)面給電(dian)(dian)池(chi)充(chong)(chong)電(dian)(dian),另一(yi)方(fang)面通(tong)過合閘(zha)分(fen)路和控制(zhi)分(fen)路給負(fu)載提(ti)供(gong)正常的(de)直流(liu)電(dian)(dian)源(yuan)。
交流(liu)輸入停(ting)電(dian)(dian)或異常時,充電(dian)(dian)模塊(kuai)停(ting)止(zhi)工(gong)作,由電(dian)(dian)池通過合(he)閘分(fen)路(lu)和控制分(fen)路(lu)給(gei)負(fu)載(zai)供(gong)電(dian)(dian)。交流(liu)輸入恢復正常以后,充電(dian)(dian)模塊(kuai)對電(dian)(dian)池充電(dian)(dian)。