互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)又稱為儀用(yong)變壓(ya)器(qi)(qi)(qi)，是電(dian)(dian)(dian)流互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)和電(dian)(dian)(dian)壓(ya)互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)的(de)(de)(de)統稱。能將高(gao)電(dian)(dian)(dian)壓(ya)變成低(di)電(dian)(dian)(dian)壓(ya)、大電(dian)(dian)(dian)流變成小(xiao)電(dian)(dian)(dian)流，用(yong)于量(liang)(liang)測或保護系統。電(dian)(dian)(dian)力互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)的(de)(de)(de)油(you)(you)(you)箱(xiang)一(yi)般做成橢(tuo)圓形(xing)，這樣可(ke)使油(you)(you)(you)箱(xiang)有較高(gao)的(de)(de)(de)機械強度(du)，而且需油(you)(you)(you)量(liang)(liang)較少。油(you)(you)(you)箱(xiang)用(yong)鋼板(ban)焊成。油(you)(you)(you)箱(xiang)的(de)(de)(de)結(jie)構與互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)的(de)(de)(de)容量(liang)(liang)、發熱情況密(mi)切相關。干式(shi)互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)：干式(shi)互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)與油(you)(you)(you)浸(jin)式(shi)互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)的(de)(de)(de)主要不(bu)同點在于，其鐵(tie)心和繞組都不(bu)浸(jin)在互(hu)(hu)感(gan)(gan)器(qi)(qi)(qi)油(you)(you)(you)中(zhong)，它的(de)(de)(de)冷卻介質為空氣(qi)，所用(yong)的(de)(de)(de)絕緣材料(如環氧樹脂等(deng))不(bu)燃燒、不(bu)污染使用(yong)環境，運(yun)行(xing)維(wei)護工作量(liang)(liang)小(xiao)等(deng)。

量很小(xiao)的互(hu)感器采用(yong)平(ping)板式(shi)油(you)箱；中、小(xiao)型(xing)互(hu)感器為增加(jia)散熱表(biao)面采用(yong)管式(shi)油(you)箱；大容量互(hu)感器采用(yong)散熱器式(shi)油(you)箱。為便于(yu)二(er)次(ci)儀表(biao)測量需要(yao)轉換為比(bi)較統(tong)一(yi)的電(dian)(dian)流(liu)電(dian)(dian)壓(ya)，使(shi)用(yong)互(hu)感器起(qi)到變流(liu)變壓(ya)和(he)電(dian)(dian)氣隔離的作用(yong)。互(hu)感器還可用(yong)來隔開高(gao)電(dian)(dian)壓(ya)系統(tong)，以保證人身(shen)和(he)設備的安全。電(dian)(dian)力系統(tong)用(yong)互(hu)感器是(shi)將(jiang)電(dian)(dian)網高(gao)電(dian)(dian)壓(ya)、大電(dian)(dian)流(liu)的信息傳(chuan)遞到低(di)電(dian)(dian)壓(ya)、小(xiao)電(dian)(dian)流(liu)二(er)次(ci)側的計量、測量儀表(biao)及繼電(dian)(dian)保護、自動裝置的一(yi)種特殊(shu)變壓(ya)器。

穿(chuan)心式(shi)電(dian)流(liu)互(hu)(hu)感(gan)(gan)(gan)器(qi)(qi)(qi)二(er)(er)次繞(rao)組直接均勻地纏繞(rao)在圓形鐵心上，與(yu)儀表、繼電(dian)器(qi)(qi)(qi)、變(bian)送器(qi)(qi)(qi)等電(dian)流(liu)線圈的(de)二(er)(er)次負荷串聯(lian)形成閉合回路。由于空(kong)氣的(de)絕緣強度和散熱性能都比(bi)互(hu)(hu)感(gan)(gan)(gan)器(qi)(qi)(qi)油差(cha)，互(hu)(hu)感(gan)(gan)(gan)器(qi)(qi)(qi)外殼，以空(kong)氣作(zuo)絕緣的(de)干式(shi)互(hu)(hu)感(gan)(gan)(gan)器(qi)(qi)(qi)的(de)材料消耗比(bi)油浸式(shi)要多。相(xiang)同(tong)(tong)(tong)容量條件積較(jiao)(jiao)大，其(qi)承受沖擊電(dian)壓的(de)能力(li)也較(jiao)(jiao)油浸式(shi)差(cha)。不同(tong)(tong)(tong)變(bian)比(bi)電(dian)流(liu)互(hu)(hu)感(gan)(gan)(gan)器(qi)(qi)(qi)。這種型號的(de)電(dian)流(liu)互(hu)(hu)感(gan)(gan)(gan)器(qi)(qi)(qi)具有同(tong)(tong)(tong)一個鐵心和一次繞(rao)組，而二(er)(er)次繞(rao)組則分為兩個匝(za)數不同(tong)(tong)(tong)、各(ge)自獨立的(de)繞(rao)組。