單(dan)相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器即(ji)一次(ci)繞組和二次(ci)繞組均為單(dan)相(xiang)繞組的變(bian)(bian)(bian)壓(ya)(ya)器。由(you)于單(dan)相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器重量輕(qing)，可以(yi)靈活(huo)安裝(zhuang)在設備上(shang)使(shi)用(yong)(yong)(yong)(yong)，便(bian)于深入負荷中心，就近降壓(ya)(ya)供(gong)電(dian)，提高(gao)供(gong)電(dian)質量。一般單(dan)相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器在小(xiao)范圍內供(gong)電(dian)，發生故(gu)障波及面小(xiao)，利于提高(gao)供(gong)電(dian)可靠性。同時(shi)，因為單(dan)相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器重量輕(qing)，安裝(zhuang)維護方便(bian)，使(shi)用(yong)(yong)(yong)(yong)靈活(huo)，可以(yi)單(dan)相(xiang)使(shi)用(yong)(yong)(yong)(yong)，也(ye)可以(yi)三臺組成(cheng)三相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器使(shi)用(yong)(yong)(yong)(yong)。相(xiang)同容量的單(dan)相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器比三相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器用(yong)(yong)(yong)(yong)鐵減少20%，用(yong)(yong)(yong)(yong)銅減少10%。尤(you)其是采用(yong)(yong)(yong)(yong)卷鐵芯(xin)結構時(shi)，變(bian)(bian)(bian)壓(ya)(ya)器的空載損耗可下(xia)降15%以(yi)上(shang)，這將使(shi)單(dan)相(xiang)變(bian)(bian)(bian)壓(ya)(ya)器的制造成(cheng)本(ben)(ben)和使(shi)用(yong)(yong)(yong)(yong)成(cheng)本(ben)(ben)同時(shi)下(xia)降，從(cong)而(er)獲得良好的壽命(ming)周期成(cheng)本(ben)(ben)。