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       變(bian)壓器(qi)額(e)(e)(e)定(ding)容(rong)量是指主(zhu)分(fen)接下視在功(gong)率(lv)的(de)(de)慣用值。在變(bian)壓器(qi)銘牌上(shang)規定(ding)的(de)(de)容(rong)量就是額(e)(e)(e)定(ding)容(rong)量，它是指分(fen)接開關(guan)位于主(zhu)分(fen)接，是額(e)(e)(e)定(ding)滿(man)載電(dian)壓、額(e)(e)(e)定(ding)電(dian)流與相應的(de)(de)相系數的(de)(de)乘積。對三(san)相變(bian)壓器(qi)而言，額(e)(e)(e)定(ding)總(zong)容(rong)量容(rong)量等于=3×額(e)(e)(e)定(ding)相電(dian)壓×相電(dian)流，額(e)(e)(e)定(ding)容(rong)量一般(ban)以kVA或MVA表(biao)示。

      額(e)(e)(e)定(ding)(ding)(ding)(ding)容量(liang)是(shi)(shi)在(zai)(zai)規定(ding)(ding)(ding)(ding)的(de)整個正(zheng)常使用壽命(ming)期間，如30年，所(suo)能連續輸出(chu)最(zui)大容量(liang)。而(er)實(shi)際輸出(chu)容量(liang)為有負載(zai)時的(de)電(dian)壓（感性負載(zai)時，負載(zai)時電(dian)壓小于額(e)(e)(e)定(ding)(ding)(ding)(ding)空載(zai)電(dian)壓）、額(e)(e)(e)定(ding)(ding)(ding)(ding)電(dian)流與相(xiang)(xiang)(xiang)應系數(shu)的(de)乘積。額(e)(e)(e)定(ding)(ding)(ding)(ding)容量(liang)是(shi)(shi)指(zhi)主分接下(xia)視在(zai)(zai)功率的(de)慣用值(zhi)。在(zai)(zai)變壓器(qi)銘牌上規定(ding)(ding)(ding)(ding)的(de)容量(liang)就是(shi)(shi)額(e)(e)(e)定(ding)(ding)(ding)(ding)容量(liang)，它是(shi)(shi)指(zhi)分接開關位于主分接，是(shi)(shi)額(e)(e)(e)定(ding)(ding)(ding)(ding)空載(zai)電(dian)壓、額(e)(e)(e)定(ding)(ding)(ding)(ding)電(dian)流與相(xiang)(xiang)(xiang)應的(de)相(xiang)(xiang)(xiang)系數(shu)的(de)乘積。對三相(xiang)(xiang)(xiang)變壓器(qi)而(er)言，額(e)(e)(e)定(ding)(ding)(ding)(ding)容量(liang)等于=3×額(e)(e)(e)定(ding)(ding)(ding)(ding)相(xiang)(xiang)(xiang)電(dian)壓×相(xiang)(xiang)(xiang)電(dian)流，額(e)(e)(e)定(ding)(ding)(ding)(ding)容量(liang)一般以(yi)kVA或(huo)MVA表示。

      變(bian)壓(ya)器(qi)容量就是其額定電壓(ya)與額定電流的(de)乘積，其單(dan)位(wei)是VA，容量大(da)了也可(ke)以是KVA或者MVA。變(bian)壓(ya)器(qi)的(de)功(gong)率(lv)(lv)=輸(shu)(shu)出電壓(ya)*輸(shu)(shu)出電流（如(ru)果(guo)有多組(zu)就每組(zu)功(gong)率(lv)(lv)相(xiang)加(jia)）得到的(de)結果(guo)要除以變(bian)壓(ya)器(qi)的(de)效率(lv)(lv)，否則輸(shu)(shu)出功(gong)率(lv)(lv)不足。