變(bian)壓(ya)器(qi)由鐵芯（或(huo)磁(ci)(ci)芯）和(he)線圈(quan)(quan)組成(cheng)，線圈(quan)(quan)有兩個或(huo)兩個以(yi)上的(de)(de)(de)繞(rao)組，其(qi)中接電(dian)源的(de)(de)(de)繞(rao)組叫(jiao)初(chu)級線圈(quan)(quan)，變(bian)壓(ya)器(qi)生產商，其(qi)余的(de)(de)(de)繞(rao)組叫(jiao)次級線圈(quan)(quan)。額定(ding)容(rong)量是(shi)一個表現(xian)(xian)功(gong)率(lv)的(de)(de)(de)慣用值，它(ta)(ta)是(shi)表征傳(chuan)輸電(dian)能的(de)(de)(de)大小，以(yi)kVA或(huo)MVA表示(shi)，當對變(bian)壓(ya)器(qi)施加(jia)額定(ding)電(dian)壓(ya)時(shi)，根據它(ta)(ta)來(lai)確定(ding)在規定(ding)條件下不超(chao)過(guo)溫升(sheng)限值的(de)(de)(de)額定(ding)電(dian)流(liu)。電(dian)力變(bian)壓(ya)器(qi)簡(jian)介(jie)：變(bian)壓(ya)器(qi)是(shi)用來(lai)變(bian)換交(jiao)流(liu)電(dian)壓(ya)、電(dian)流(liu)而(er)傳(chuan)輸交(jiao)流(liu)電(dian)能的(de)(de)(de)一種靜止的(de)(de)(de)電(dian)器(qi)設備。它(ta)(ta)是(shi)根據電(dian)磁(ci)(ci)感(gan)應(ying)的(de)(de)(de)原理實(shi)現(xian)(xian)電(dian)能傳(chuan)遞的(de)(de)(de)。

變(bian)壓(ya)器(qi)(qi)就(jiu)其(qi)用(yong)途可分為電(dian)力(li)變(bian)壓(ya)器(qi)(qi)、試驗變(bian)壓(ya)器(qi)(qi)、儀用(yong)變(bian)壓(ya)器(qi)(qi)及特殊(shu)用(yong)途的變(bian)壓(ya)器(qi)(qi)：電(dian)力(li)變(bian)壓(ya)器(qi)(qi)是電(dian)力(li)輸(shu)配電(dian)、電(dian)力(li)用(yong)戶配電(dian)的必要(yao)設備。變(bian)壓(ya)器(qi)(qi)損(sun)耗(hao)：一般來(lai)說(shuo)，從發(fa)(fa)電(dian)、供電(dian)到用(yong)電(dian)，需要(yao)經過(guo)3～5次的變(bian)壓(ya)過(guo)程(cheng)(cheng)，三相交流穩壓(ya)器(qi)(qi)價格其(qi)自身會產生(sheng)較大的有功功率(lv)損(sun)失和無功功率(lv)消耗(hao)。在市場國際(ji)化發(fa)(fa)展的進程(cheng)(cheng)中，我國變(bian)壓(ya)器(qi)(qi)行業(ye)雖在小容量領域已擁有相當的實力(li)，并(bing)在國際(ji)市場中占(zhan)據重要(yao)地位(wei)。

一(yi)般常用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)源(yuan)變(bian)壓(ya)(ya)器按相(xiang)(xiang)(xiang)數分(fen)(fen)：(1)單相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)源(yuan)變(bian)壓(ya)(ya)器：用(yong)(yong)于(yu)單相(xiang)(xiang)(xiang)負荷和三(san)(san)(san)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)源(yuan)變(bian)壓(ya)(ya)器組。(2)三(san)(san)(san)相(xiang)(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)源(yuan)變(bian)壓(ya)(ya)器：用(yong)(yong)于(yu)三(san)(san)(san)相(xiang)(xiang)(xiang)系統(tong)的(de)(de)(de)(de)(de)升、降(jiang)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。和變(bian)壓(ya)(ya)器相(xiang)(xiang)(xiang)關的(de)(de)(de)(de)(de)技術(shu)參數有：額(e)定電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)：空載、額(e)定分(fen)(fen)接(jie)下，端電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)(de)(de)(de)值（即(ji)一(yi)次、二(er)次側(ce)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)值；空載損(sun)耗：空載條件(jian)下，變(bian)壓(ya)(ya)器的(de)(de)(de)(de)(de)損(sun)耗（也叫鐵(tie)耗）。變(bian)壓(ya)(ya)器分(fen)(fen)接(jie)（抽(chou)頭）的(de)(de)(de)(de)(de)概念：為適合電(dian)(dian)(dian)(dian)(dian)網運行(xing)需要，三(san)(san)(san)相(xiang)(xiang)(xiang)交(jiao)流穩壓(ya)(ya)器價(jia)(jia)格(ge)一(yi)般的(de)(de)(de)(de)(de)變(bian)壓(ya)(ya)器高壓(ya)(ya)側(ce)都(dou)有抽(chou)頭，三(san)(san)(san)相(xiang)(xiang)(xiang)交(jiao)流電(dian)(dian)(dian)(dian)(dian)源(yuan)價(jia)(jia)格(ge)這些(xie)抽(chou)頭的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)值都(dou)是用(yong)(yong)額(e)定電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)的(de)(de)(de)(de)(de)百分(fen)(fen)比表示的(de)(de)(de)(de)(de)，即(ji)所(suo)謂的(de)(de)(de)(de)(de)分(fen)(fen)接(jie)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)。