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      單(dan)相(xiang)變(bian)壓(ya)器(qi)�吺且�(yi)(yi)種利用電(dian)(dian)(dian)磁(ci)(ci)感應(ying)原理來改(gai)變(bian)交流(liu)電(dian)(dian)(dian)壓(ya)的(de)裝置，它主要由(you)初級(ji)線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)、次(ci)級(ji)線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)和鐵心（磁(ci)(ci)芯）組成。這種變(bian)壓(ya)器(qi)具有(you)一(yi)(yi)個(ge)(ge)能夠進行(xing)電(dian)(dian)(dian)磁(ci)(ci)感應(ying)的(de)線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)（稱為“主線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)”或(huo)“一(yi)(yi)次(ci)線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)”），和一(yi)(yi)個(ge)(ge)連接在同一(yi)(yi)個(ge)(ge)磁(ci)(ci)路上并通過(guo)互(hu)感作用與主線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)耦合的(de)另一(yi)(yi)個(ge)(ge)線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)（稱為“副線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)”或(huo)“二次(ci)線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)”）。當主線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)中通入交流(liu)電(dian)(dian)(dian)時，會(hui)產生變(bian)化的(de)磁(ci)(ci)場，從(cong)而引起副線(xian)(xian)(xian)圈(quan)(quan)(quan)(quan)中也(ye)會(hui)產生電(dian)(dian)(dian)勢(shi)。單(dan)相(xiang)變(bian)壓(ya)器(qi)被廣(guang)泛應(ying)用于升降電(dian)(dian)(dian)壓(ya)、改(gai)變(bian)電(dian)(dian)(dian)流(liu)強(qiang)度，以及進行(xing)電(dian)(dian)(dian)壓(ya)穩定等領域。

      單(dan)相(xiang)變(bian)壓(ya)(ya)器(qi)與三(san)相(xiang)變(bian)壓(ya)(ya)器(qi)的(de)主要(yao)區別在于電(dian)源(yuan)(yuan)的(de)相(xiang)數。單(dan)相(xiang)變(bian)壓(ya)(ya)器(qi)使(shi)用(yong)單(dan)相(xiang)電(dian)源(yuan)(yuan)，而(er)三(san)相(xiang)變(bian)壓(ya)(ya)器(qi)則(ze)使(shi)用(yong)三(san)相(xiang)電(dian)源(yuan)(yuan)。單(dan)相(xiang)變(bian)壓(ya)(ya)器(qi)在結構上通(tong)常比三(san)相(xiang)變(bian)壓(ya)(ya)器(qi)簡單(dan)，體積(ji)小(xiao)，且由于只涉及一(yi)個相(xiang)位，其設(she)計和運行也相(xiang)對(dui)直接(jie)。此外，單(dan)相(xiang)變(bian)壓(ya)(ya)器(qi)在負荷密度較小(xiao)的(de)低壓(ya)(ya)配電(dian)網中應用(yong)較多，因為它們通(tong)常具(ju)有較小(xiao)的(de)鐵損(sun)和較低的(de)能耗(hao)。