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現(xian)代化的(de)(de)(de)工業企業廣泛的(de)(de)(de)采用電(dian)(dian)(dian)(dian)(dian)(dian)力(li)作(zuo)為(wei)能源，而發電(dian)(dian)(dian)(dian)(dian)(dian)廠發出的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)力(li)往往需(xu)經(jing)遠距離傳(chuan)(chuan)輸(shu)(shu)(shu)才能到達用電(dian)(dian)(dian)(dian)(dian)(dian)地(di)區(qu)。在(zai)傳(chuan)(chuan)輸(shu)(shu)(shu)的(de)(de)(de)功率恒定時(shi)，傳(chuan)(chuan)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)越高(gao)，則所(suo)需(xu)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)越小(xiao)。因為(wei)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)降(jiang)(jiang)(jiang)正比(bi)于電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。線損正比(bi)于電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)平方(fang)，所(suo)以(yi)(yi)(yi)用較(jiao)高(gao)的(de)(de)(de)輸(shu)(shu)(shu)電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)可(ke)以(yi)(yi)(yi)獲得(de)較(jiao)低(di)的(de)(de)(de)線路壓(ya)(ya)降(jiang)(jiang)(jiang)和線路損耗，要制造電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)很高(gao)的(de)(de)(de)發電(dian)(dian)(dian)(dian)(dian)(dian)機，目前技術很困(kun)難(nan)，所(suo)以(yi)(yi)(yi)要 用專門的(de)(de)(de)設(she)備(bei)將(jiang)(jiang)(jiang)發電(dian)(dian)(dian)(dian)(dian)(dian)機端(duan)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)升高(gao)以(yi)(yi)(yi)后再輸(shu)(shu)(shu)送出去，這(zhe)種專門的(de)(de)(de)設(she)備(bei)就是變壓(ya)(ya)器。另一(yi)方(fang)面(mian)，在(zai)受電(dian)(dian)(dian)(dian)(dian)(dian)端(duan)又必(bi)須用降(jiang)(jiang)(jiang)壓(ya)(ya)變壓(ya)(ya)器將(jiang)(jiang)(jiang)高(gao)壓(ya)(ya)降(jiang)(jiang)(jiang)低(di)到配電(dian)(dian)(dian)(dian)(dian)(dian)系統(tong)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)，故要經(jing)過一(yi)系列(lie)配電(dian)(dian)(dian)(dian)(dian)(dian)變壓(ya)(ya)器將(jiang)(jiang)(jiang)高(gao)壓(ya)(ya)降(jiang)(jiang)(jiang)低(di)到合適的(de)(de)(de)值以(yi)(yi)(yi)供使用。

由以上可(ke)知，變(bian)(bian)壓(ya)器是一(yi)種通過改變(bian)(bian)電(dian)壓(ya)而(er)傳輸交流電(dian)能的靜止感應(ying)電(dian)器。 在電(dian)力系統中，變(bian)(bian)壓(ya)器的地(di)位十分重要，不僅所需(xu)數量多，而(er)且性能好，運行安全靠(kao)。

變壓器除(chu)了應用在電(dian)力(li)系(xi)統中(zhong)，還應用(yong)(yong)(yong)在需要特種電源(yuan)的(de)工礦(kuang)企(qi)業中(zhong)。例(li)如：冶煉用(yong)(yong)(yong)的(de)電爐變壓(ya)器，電解或化工用(yong)(yong)(yong)的(de)整流變壓(ya)器，焊接(jie)用(yong)(yong)(yong)的(de)電焊變壓(ya)器，試驗用(yong)(yong)(yong)的(de)試驗變壓(ya)器，交通用(yong)(yong)(yong)的(de)牽引變壓(ya)器，以及補償用(yong)(yong)(yong)的(de)電抗器，保護用(yong)(yong)(yong)的(de)消(xiao)弧線圈，測(ce)量(liang)用(yong)(yong)(yong)的(de)互感(gan)器等(deng)。