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變(bian)(bian)壓(ya)(ya)器(qi)是(shi)變(bian)(bian)換(huan)交(jiao)流(liu)電(dian)(dian)(dian)(dian)壓(ya)(ya)、電(dian)(dian)(dian)(dian)流(liu)和(he)阻(zu)抗(kang)的(de)(de)(de)器(qi)件(jian)，當初級(ji)線(xian)(xian)(xian)(xian)圈(quan)中(zhong)通(tong)有交(jiao)流(liu)電(dian)(dian)(dian)(dian)流(liu)時，鐵芯(xin)（或(huo)磁芯(xin)）中(zhong)便(bian)產生交(jiao)流(liu)磁通(tong)，使次級(ji)線(xian)(xian)(xian)(xian)圈(quan)中(zhong)感(gan)應(ying)(ying)出電(dian)(dian)(dian)(dian)壓(ya)(ya)（或(huo)電(dian)(dian)(dian)(dian)流(liu)）。變(bian)(bian)壓(ya)(ya)器(qi)由鐵芯(xin)（或(huo)磁芯(xin)）和(he)線(xian)(xian)(xian)(xian)圈(quan)組成，線(xian)(xian)(xian)(xian)圈(quan)有兩個或(huo)兩個以上(shang)的(de)(de)(de)繞(rao)組，其(qi)中(zhong)接電(dian)(dian)(dian)(dian)源的(de)(de)(de)繞(rao)組叫初級(ji)線(xian)(xian)(xian)(xian)圈(quan)，其(qi)余(yu)的(de)(de)(de)繞(rao)組叫次級(ji)線(xian)(xian)(xian)(xian)圈(quan)。在發電(dian)(dian)(dian)(dian)機(ji)中(zhong)，不(bu)管是(shi)線(xian)(xian)(xian)(xian)圈(quan)運(yun)(yun)動(dong)通(tong)過(guo)磁場或(huo)磁場運(yun)(yun)動(dong)通(tong)過(guo)固定線(xian)(xian)(xian)(xian)圈(quan)，均能在線(xian)(xian)(xian)(xian)圈(quan)中(zhong)感(gan)應(ying)(ying)電(dian)(dian)(dian)(dian)勢，此兩種(zhong)情況，磁通(tong)的(de)(de)(de)值(zhi)均不(bu)變(bian)(bian)，但與線(xian)(xian)(xian)(xian)圈(quan)相(xiang)交(jiao)鏈的(de)(de)(de)磁通(tong)數(shu)量卻有變(bian)(bian)動(dong)，這是(shi)互感(gan)應(ying)(ying)的(de)(de)(de)原理(li)。變(bian)(bian)壓(ya)(ya)器(qi)就是(shi)一種(zhong)利用電(dian)(dian)(dian)(dian)磁互感(gan)效應(ying)(ying)，變(bian)(bian)換(huan)電(dian)(dian)(dian)(dian)壓(ya)(ya)，電(dian)(dian)(dian)(dian)流(liu)和(he)阻(zu)抗(kang)的(de)(de)(de)器(qi)件(jian)。