一般(ban)(ban)常用(yong)(yong)電(dian)(dian)源(yuan)(yuan)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)按(an)相數分(fen)：(1)單相電(dian)(dian)源(yuan)(yuan)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)：用(yong)(yong)于(yu)單相負荷和三相電(dian)(dian)源(yuan)(yuan)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)組。(2)三相電(dian)(dian)源(yuan)(yuan)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)：用(yong)(yong)于(yu)三相系(xi)統(tong)的(de)升(sheng)、降電(dian)(dian)壓(ya)(ya)(ya)(ya)。和變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)相關的(de)技術參數有：額定(ding)電(dian)(dian)壓(ya)(ya)(ya)(ya)：空載、額定(ding)分(fen)接(jie)(jie)下，端電(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)值(zhi)（即(ji)一次、二次側電(dian)(dian)壓(ya)(ya)(ya)(ya)值(zhi)；空載損耗(hao)：空載條件(jian)下，變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)損耗(hao)（也叫鐵耗(hao)）。變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)分(fen)接(jie)(jie)（抽頭(tou)）的(de)概念：為適合電(dian)(dian)網運(yun)行(xing)需要，三相交流(liu)穩(wen)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)價格一般(ban)(ban)的(de)變(bian)(bian)(bian)壓(ya)(ya)(ya)(ya)器(qi)(qi)(qi)高(gao)壓(ya)(ya)(ya)(ya)側都有抽頭(tou)，三相交流(liu)電(dian)(dian)源(yuan)(yuan)價格這(zhe)些抽頭(tou)的(de)電(dian)(dian)壓(ya)(ya)(ya)(ya)值(zhi)都是(shi)用(yong)(yong)額定(ding)電(dian)(dian)壓(ya)(ya)(ya)(ya)的(de)百(bai)分(fen)比表示的(de)，即(ji)所(suo)謂的(de)分(fen)接(jie)(jie)電(dian)(dian)壓(ya)(ya)(ya)(ya)。

變(bian)壓(ya)(ya)(ya)器(qi)(qi)由鐵芯（或(huo)(huo)磁(ci)芯）和(he)線(xian)(xian)圈組(zu)(zu)成，單(dan)相變(bian)壓(ya)(ya)(ya)器(qi)(qi)，線(xian)(xian)圈有(you)兩個或(huo)(huo)兩個以上的(de)繞組(zu)(zu)，其(qi)中接電(dian)源(yuan)的(de)繞組(zu)(zu)叫(jiao)初(chu)級線(xian)(xian)圈，其(qi)余的(de)繞組(zu)(zu)叫(jiao)次級線(xian)(xian)圈。額(e)定(ding)容量(liang)是一(yi)個表現(xian)功率的(de)慣用值，它是表征傳輸電(dian)能的(de)大小，以kVA或(huo)(huo)MVA表示，當對變(bian)壓(ya)(ya)(ya)器(qi)(qi)施加(jia)額(e)定(ding)電(dian)壓(ya)(ya)(ya)時，根(gen)據(ju)它來確(que)定(ding)在規定(ding)條件(jian)下不超過溫升限值的(de)額(e)定(ding)電(dian)流(liu)(liu)。電(dian)力變(bian)壓(ya)(ya)(ya)器(qi)(qi)簡介：變(bian)壓(ya)(ya)(ya)器(qi)(qi)是用來變(bian)換交(jiao)(jiao)流(liu)(liu)電(dian)壓(ya)(ya)(ya)、電(dian)流(liu)(liu)而傳輸交(jiao)(jiao)流(liu)(liu)電(dian)能的(de)一(yi)種(zhong)靜止的(de)電(dian)器(qi)(qi)設備。它是根(gen)據(ju)電(dian)磁(ci)感應的(de)原(yuan)理實現(xian)電(dian)能傳遞的(de)。

一般常用電(dian)(dian)源變(bian)(bian)(bian)壓(ya)(ya)器按(an)相(xiang)(xiang)數分：(1)單(dan)(dan)相(xiang)(xiang)電(dian)(dian)源變(bian)(bian)(bian)壓(ya)(ya)器：用于單(dan)(dan)相(xiang)(xiang)負荷和三(san)(san)相(xiang)(xiang)電(dian)(dian)源變(bian)(bian)(bian)壓(ya)(ya)器組。(2)三(san)(san)相(xiang)(xiang)電(dian)(dian)源變(bian)(bian)(bian)壓(ya)(ya)器：用于三(san)(san)相(xiang)(xiang)系(xi)統的(de)升、降(jiang)電(dian)(dian)壓(ya)(ya)。變(bian)(bian)(bian)壓(ya)(ya)器：簡單(dan)(dan)的(de)說，變(bian)(bian)(bian)壓(ya)(ya)器就是(shi)利用交變(bian)(bian)(bian)電(dian)(dian)磁場來實現不(bu)同電(dian)(dian)壓(ya)(ya)等(deng)級轉(zhuan)換(huan)(huan)的(de)設(she)備(bei)（實際上(shang)是(shi)電(dian)(dian)能的(de)轉(zhuan)換(huan)(huan)），其變(bian)(bian)(bian)換(huan)(huan)前后(hou)的(de)電(dian)(dian)壓(ya)(ya)不(bu)發(fa)生頻率(lv)上(shang)的(de)變(bian)(bian)(bian)化(hua)。變(bian)(bian)(bian)壓(ya)(ya)器可(ke)以變(bian)(bian)(bian)換(huan)(huan)交流電(dian)(dian)壓(ya)(ya)、電(dian)(dian)流和阻抗。簡單(dan)(dan)的(de)鐵(tie)心(xin)變(bian)(bian)(bian)壓(ya)(ya)器由一個軟磁材料做成的(de)鐵(tie)心(xin)及套在鐵(tie)心(xin)上(shang)的(de)兩個匝數不(bu)等(deng)的(de)線圈構(gou)成。