降壓啟動自耦變壓器

在一(yi)個(ge)(ge)閉合的(de)鐵芯上繞(rao)兩(liang)個(ge)(ge)或以(yi)上的(de)線(xian)圈(quan)，當一(yi)個(ge)(ge)線(xian)圈(quan)通入(ru)交流電(dian)(dian)源時（就是(shi)初(chu)級線(xian)圈(quan)），線(xian)圈(quan)中(zhong)流過交變(bian)電(dian)(dian)流，這個(ge)(ge)交變(bian)電(dian)(dian)流在鐵芯中(zhong)產生(sheng)交變(bian)磁場(chang)，交變(bian)主磁通在初(chu)級線(xian)圈(quan)中(zhong)產生(sheng)自身感應(ying)電(dian)(dian)動勢(shi)，同時另外(wai)一(yi)個(ge)(ge)線(xian)圈(quan)（就是(shi)次

產品介紹(shao)：

自耦變壓器特點

⑴由于自耦(ou)變(bian)(bian)(bian)(bian)壓(ya)(ya)器的計算容(rong)(rong)量(liang)小(xiao)于額(e)定容(rong)(rong)量(liang)．所以在同樣的額(e)定容(rong)(rong)量(liang)下，自耦(ou)變(bian)(bian)(bian)(bian)壓(ya)(ya)器的主要(yao)(yao)尺寸(cun)較(jiao)小(xiao)，有效材料（硅鋼片(pian)和導線）和結構材料（鋼材）都相應減(jian)少(shao)，從(cong)而降(jiang)低了成本。自耦(ou)變(bian)(bian)(bian)(bian)壓(ya)(ya)器 效材料的減(jian)少(shao)使得銅耗和鐵耗也(ye)相應減(jian)少(shao)，故(gu)自耦(ou)變(bian)(bian)(bian)(bian)壓(ya)(ya)器的效率較(jiao)高。同時由于主要(yao)(yao)尺寸(cun)的縮小(xiao)和質(zhi)量(liang)的減(jian)小(xiao)，可以在容(rong)(rong)許的運輸條件下制造單臺容(rong)(rong)量(liang)更大的變(bian)(bian)(bian)(bian)壓(ya)(ya)器。但通常在自耦(ou)變(bian)(bian)(bian)(bian)壓(ya)(ya)器中(zhong)只有k≤2時，上述優點(dian)才明(ming)顯。

⑵由于自耦變(bian)壓器的短(duan)路(lu)阻抗標(biao)幺值(zhi)比雙繞組變(bian)壓器小(xiao)，故電壓變(bian)化率(lv)較(jiao)小(xiao)，但短(duan)路(lu)電流較(jiao)大。

⑶由(you)于(yu)自耦(ou)變壓(ya)器一、二次(ci)之間有電(dian)的(de)直接聯系，當高壓(ya)側(ce)過(guo)電(dian)壓(ya)時會引(yin)起(qi)低壓(ya)側(ce)嚴重(zhong)過(guo)電(dian)壓(ya)。為了避(bi)免(mian)這種危險，一、二次(ci)都必須(xu)裝(zhuang)設避(bi)雷器，不要(yao)認為一、二次(ci)繞組是(shi)串聯的(de)，一次(ci)已裝(zhuang)、二次(ci)就可省(sheng)略(lve)。

⑷在一般變壓(ya)(ya)(ya)(ya)器中。有(you)載(zai)調(diao)(diao)壓(ya)(ya)(ya)(ya)裝置往(wang)往(wang)連接(jie)在接(jie)地的中性點上，這樣調(diao)(diao)壓(ya)(ya)(ya)(ya)裝置的電(dian)壓(ya)(ya)(ya)(ya)等級(ji)可以比在線(xian)端(duan)調(diao)(diao)壓(ya)(ya)(ya)(ya)時低。而自耦(ou)變壓(ya)(ya)(ya)(ya)器中性點調(diao)(diao)壓(ya)(ya)(ya)(ya)側會帶(dai)來所謂的相關調(diao)(diao)壓(ya)(ya)(ya)(ya)問題。因此，要求自耦(ou)變壓(ya)(ya)(ya)(ya)器有(you)載(zai)調(diao)(diao)壓(ya)(ya)(ya)(ya)時，只能采用線(xian)端(duan)調(diao)(diao)壓(ya)(ya)(ya)(ya)方式。

自耦變壓器基本原理(li)

自耦變(bian)壓器降壓啟動控(kong)制(zhi)線路

在(zai)一(yi)個(ge)閉(bi)合的鐵芯上繞兩個(ge)或以(yi)上的線(xian)圈(quan)(quan)，當一(yi)個(ge)線(xian)圈(quan)(quan)通入交流(liu)電(dian)(dian)源時（就是初級(ji)(ji)(ji)(ji)(ji)線(xian)圈(quan)(quan)），線(xian)圈(quan)(quan)中(zhong)流(liu)過交變(bian)電(dian)(dian)流(liu)，這個(ge)交變(bian)電(dian)(dian)流(liu)在(zai)鐵芯中(zhong)產生交變(bian)磁(ci)場，交變(bian)主(zhu)磁(ci)通在(zai)初級(ji)(ji)(ji)(ji)(ji)線(xian)圈(quan)(quan)中(zhong)產生自(zi)身感應電(dian)(dian)動勢，同時另外一(yi)個(ge)線(xian)圈(quan)(quan)（就是次(ci)(ci)級(ji)(ji)(ji)(ji)(ji)線(xian)圈(quan)(quan)）中(zhong)感應互感電(dian)(dian)動勢。通過改變(bian)初、次(ci)(ci)級(ji)(ji)(ji)(ji)(ji)的線(xian)圈(quan)(quan)匝(za)數比的關系來改變(bian)初、次(ci)(ci)級(ji)(ji)(ji)(ji)(ji)線(xian)圈(quan)(quan)端電(dian)(dian)壓，實(shi)現電(dian)(dian)壓的變(bian)換，一(yi)般匝(za)數比為1.5：1~2：1。因為初級(ji)(ji)(ji)(ji)(ji)和次(ci)(ci)級(ji)(ji)(ji)(ji)(ji)線(xian)圈(quan)(quan)直接相連，有(you)跨級(ji)(ji)(ji)(ji)(ji)漏電(dian)(dian)的危險。所以(yi)不能作(zuo)行燈變(bian)壓器。