變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)電(dian)(dian)(dian)橋測(ce)(ce)量(liang)(liang)儀(yi)(yi)(yi)是(shi)(shi)測(ce)(ce)量(liang)(liang)變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)壓(ya)(ya)(ya)比(bi)的儀(yi)(yi)(yi)器(qi)(qi)。變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)電(dian)(dian)(dian)橋測(ce)(ce)量(liang)(liang)儀(yi)(yi)(yi)，屬于(yu)(yu)電(dian)(dian)(dian)力(li)(li)測(ce)(ce)量(liang)(liang)儀(yi)(yi)(yi)器(qi)(qi)領域，由變(bian)壓(ya)(ya)(ya)器(qi)(qi)、可(ke)變(bian)電(dian)(dian)(dian)阻(zu)、電(dian)(dian)(dian)阻(zu)箱(xiang)、切(qie)換(huan)開(kai)關(guan)、撥動(dong)開(kai)關(guan)、相敏放大器(qi)(qi)等(deng)組(zu)成，該變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)電(dian)(dian)(dian)橋測(ce)(ce)量(liang)(liang)儀(yi)(yi)(yi)由于(yu)(yu)增加(jia)了幾個切(qie)換(huan)開(kai)關(guan)，使(shi)(shi)其具有(you)接線(xian)容易，操作(zuo)(zuo)簡單(dan)，提高(gao)了工作(zuo)(zuo)效率，另外，還具有(you)體積小，攜(xie)帶方(fang)(fang)便，準(zhun)(zhun)確(que)度(du)高(gao)等(deng)優點。鼎升電(dian)(dian)(dian)力(li)(li)生產的DCBC-H全自動(dong)變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)測(ce)(ce)試(shi)儀(yi)(yi)(yi)屬于(yu)(yu)現代電(dian)(dian)(dian)力(li)(li)工業部門(men)的變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)測(ce)(ce)試(shi)設備。變(bian)壓(ya)(ya)(ya)器(qi)(qi)的變(bian)壓(ya)(ya)(ya)比(bi)是(shi)(shi)變(bian)壓(ya)(ya)(ya)器(qi)(qi)制造和使(shi)(shi)用中(zhong)的一(yi)個很(hen)重要的技術(shu)參數(shu)，對(dui)于(yu)(yu)這個參數(shu)檢測(ce)(ce)的準(zhun)(zhun)確(que)與否(fou)，是(shi)(shi)至關(guan)重要的。長期(qi)以來，國內對(dui)于(yu)(yu)變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)電(dian)(dian)(dian)橋的檢測(ce)(ce)一(yi)直沒有(you)統一(yi)的標準(zhun)(zhun)和方(fang)(fang)法(fa)，致使(shi)(shi)許多單(dan)位自行(xing)(xing)采用一(yi)些簡單(dan)的方(fang)(fang)法(fa)對(dui)變(bian)壓(ya)(ya)(ya)器(qi)(qi)變(bian)比(bi)電(dian)(dian)(dian)橋進行(xing)(xing)檢測(ce)(ce)，如互(hu)感(gan)器(qi)(qi)法(fa)、電(dian)(dian)(dian)阻(zu)分壓(ya)(ya)(ya)法(fa)等(deng)。這些方(fang)(fang)法(fa)因標準(zhun)(zhun)本身的局限性(xing)，都不(bu)能對(dui)變(bian)壓(ya)(ya)(ya)比(bi)電(dian)(dian)(dian)橋進行(xing)(xing)全面的檢定，所(suo)以不(bu)能確(que)切(qie)地反映被(bei)檢電(dian)(dian)(dian)橋的誤差。

變壓器變比電橋結構和工作原理：

變(bian)(bian)壓(ya)器變(bian)(bian)比(bi)電橋(qiao)有三種結構(gou)形式，即標(biao)準(zhun)變(bian)(bian)壓(ya)器型、標(biao)準(zhun)電阻(zu)型和(he)自動變(bian)(bian)比(bi)測量儀。目前國內常(chang)見的是標(biao)準(zhun)變(bian)(bian)壓(ya)器型和(he)標(biao)準(zhun)電阻(zu)型。

變(bian)壓器變(bian)比電橋工作(zuo)原理(li)如圖(tu)1所示。

圖(tu)1（a）為(wei)標準變(bian)(bian)(bian)壓器型變(bian)(bian)(bian)壓器變(bian)(bian)(bian)比(bi)電(dian)橋工作(zuo)原理(li)圖(tu)，圖(tu)1（b）為(wei)標準電(dian)阻型變(bian)(bian)(bian)壓器變(bian)(bian)(bian)比(bi)電(dian)橋工作(zuo)原理(li)圖(tu)。

圖1中當被測變(bian)(bian)壓(ya)(ya)器的(de)初級(ji)側XA、XB端與變(bian)(bian)壓(ya)(ya)比(bi)電(dian)橋(qiao)的(de)NA、NB端共同受電(dian)時，被測變(bian)(bian)壓(ya)(ya)器的(de)次(ci)級(ji)側Xa、XB端與變(bian)(bian)壓(ya)(ya)比(bi)電(dian)橋(qiao)的(de)Na、NB端產生電(dian)壓(ya)(ya)U1、U2，預置變(bian)(bian)壓(ya)(ya)比(bi)電(dian)橋(qiao)比(bi)值(zhi)(zhi)盤的(de)示指等于被測變(bian)(bian)壓(ya)(ya)器變(bian)(bian)壓(ya)(ya)比(bi)的(de)標準值(zhi)(zhi)、調節電(dian)橋(qiao)誤差盤使(shi)檢流(liu)計G指零，就得到被測變(bian)(bian)壓(ya)(ya)比(bi)的(de)誤差值(zhi)(zhi)。

變壓器變比電橋通常由比值盤、誤差盤、相序開關、聯結組合開關、輸入變壓器、放大器、內附檢流計等部分組成。其中，比值盤、誤差盤、相序連接、聯結組合和內附檢流計的靈敏度是需要進行常規檢定的。

變(bian)壓器(qi)變(bian)比電橋原(yuan)理(li)圖：