變(bian)壓(ya)器(qi)的(de)主(zhu)要(yao)功(gong)能(neng)是(shi)將(jiang)一(yi)種(zhong)電(dian)壓(ya)等(deng)級(ji)的(de)交(jiao)流(liu)電(dian)能(neng)轉(zhuan)換(huan)為(wei)另(ling)一(yi)種(zhong)電(dian)壓(ya)等(deng)級(ji)的(de)交(jiao)流(liu)電(dian)能(neng),以(yi)適(shi)應(ying)不(bu)同(tong)設(she)備(bei)的(de)用(yong)電(dian)需(xu)求(qiu)。它(ta)在(zai)電(dian)力(li)係(xi)統(tong)中(zhong)起(qi)著(zhe)至(zhi)關(guan)重(zhong)要(yao)的(de)作(zuo)用(yong),從(cong)發(fa)電(dian)廠(chang)到(dao)用(yong)戶(hu)家(jia)中(zhong)的(de)每(mei)個(ge)環(huan)節(jie)都(dou)需(xu)要(yao)變(bian)壓(ya)器(qi)來(lai)調(tiao)整(zheng)電(dian)壓(ya)水(shui)平(ping),保(bao)障(zhang)電(dian)力(li)傳(chuan)輸(shu)和(he)供(gong)電(dian)質(zhi)量(liang)。