變(bian)(bian)壓(ya)(ya)器(qi)是變(bian)(bian)換交(jiao)(jiao)流電壓(ya)(ya)、電流和阻(zu)抗(kang)的(de)(de)(de)器(qi)件,當初級(ji)線(xian)圈中(zhong)通(tong)有交(jiao)(jiao)流電流時(shi),鐵芯(xin)(xin)(或磁(ci)芯(xin)(xin))中(zhong)便產生交(jiao)(jiao)流磁(ci)通(tong),使次級(ji)線(xian)圈中(zhong)感應(ying)出電壓(ya)(ya)(或電流)。隨著(zhu)變(bian)(bian)壓(ya)(ya)器(qi)行業的(de)(de)(de)不斷發展,越來越多的(de)(de)(de)行業和企(qi)業運用上變(bian)(bian)壓(ya)(ya)器(qi),越來越多的(de)(de)(de)企(qi)業進入(ru)了變(bian)(bian)壓(ya)(ya)器(qi)行業,變(bian)(bian)壓(ya)(ya)器(qi)由鐵芯(xin)(xin)(或磁(ci)芯(xin)(xin))和線(xian)圈組(zu)成,線(xian)圈有兩個或兩個以上的(de)(de)(de)繞(rao)(rao)組(zu),其中(zhong)接電源(yuan)的(de)(de)(de)繞(rao)(rao)組(zu)叫初級(ji)線(xian)圈,其余的(de)(de)(de)繞(rao)(rao)組(zu)叫次級(ji)線(xian)圈。