變壓(ya)器(qi)是(shi)(shi)(shi)變換交流(liu)電(dian)(dian)(dian)壓(ya)、電(dian)(dian)(dian)流(liu)和阻抗的器(qi)件,當(dang)初級(ji)線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)中(zhong)通(tong)有交流(liu)電(dian)(dian)(dian)流(liu)時,鐵芯(或(huo)磁(ci)芯)中(zhong)便產生交流(liu)磁(ci)通(tong),使次級(ji)線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)中(zhong)感應(ying)出(chu)電(dian)(dian)(dian)壓(ya)(或(huo)電(dian)(dian)(dian)流(liu))。變壓(ya)器(qi)由(you)鐵芯(或(huo)磁(ci)芯)和線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)組(zu)成,線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)有兩(liang)個或(huo)兩(liang)個以上的繞組(zu),其(qi)中(zhong)接電(dian)(dian)(dian)源的繞組(zu)叫初級(ji)線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan),其(qi)余的繞組(zu)叫次級(ji)線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)。在(zai)發電(dian)(dian)(dian)機中(zhong),不管是(shi)(shi)(shi)線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)運(yun)動(dong)通(tong)過(guo)磁(ci)場或(huo)磁(ci)場運(yun)動(dong)通(tong)過(guo)固定線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan),均能在(zai)線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)中(zhong)感應(ying)電(dian)(dian)(dian)勢,此兩(liang)種(zhong)情況(kuang),磁(ci)通(tong)的值均不變,但與線(xian)(xian)(xian)(xian)圈(quan)(quan)(quan)相(xiang)交鏈的磁(ci)通(tong)數量卻有變動(dong),這是(shi)(shi)(shi)互(hu)感應(ying)的原理。變壓(ya)器(qi)就是(shi)(shi)(shi)一種(zhong)利用電(dian)(dian)(dian)磁(ci)互(hu)感應(ying),變換電(dian)(dian)(dian)壓(ya),電(dian)(dian)(dian)流(liu)和阻抗的器(qi)件。
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