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變壓器是輸電系統中的主要設備，其故障可能會引起爆炸甚至火災等一系列事故，因此在變壓器使用之前和使用的過程中都有一系列可缺少的試驗項目。其中包括變壓器直流電阻測試。
什么是變壓(ya)器直流電阻測(ce)試？
在采購(gou)新的(de)(de)變(bian)壓(ya)器(qi)，或(huo)者進行維(wei)修后，電廠等電力企(qi)業須要對變(bian)壓(ya)器(qi)做一系列的(de)(de)試(shi)驗(yan)項(xiang)(xiang)目來保證變(bian)壓(ya)器(qi)質量(liang)良好，而對變(bian)壓(ya)器(qi)的(de)(de)直流電阻(zu)測試(shi)是(shi)其中不可避免的(de)(de)試(shi)驗(yan)項(xiang)(xiang)目
那(nei)么(me)什么(me)是變壓器直(zhi)流(liu)電阻呢？
變壓(ya)器(qi)直流電(dian)阻(zu)(zu)是指繞(rao)組(zu)的(de)純電(dian)阻(zu)(zu)阻(zu)(zu)抗(kang)，通過測量(liang)變壓(ya)器(qi)的(de)直流電(dian)阻(zu)(zu)可以(yi)判斷變壓(ya)器(qi)內(nei)部線圈的(de)絕緣程度。檢(jian)驗三(san)相(xiang)繞(rao)組(zu)內(nei)部是否存在匝間短路(lu)，繞(rao)組(zu)接頭的(de)焊接質量(liang)等問題。
應該如何測量變壓器直流電阻呢？
電(dian)(dian)(dian)(dian)流(liu)(liu)，電(dian)(dian)(dian)(dian)壓表(biao)法，通過直流(liu)(liu)電(dian)(dian)(dian)(dian)流(liu)(liu)，用(yong)電(dian)(dian)(dian)(dian)壓表(biao)測(ce)量(liang)其(qi)電(dian)(dian)(dian)(dian)壓，用(yong)電(dian)(dian)(dian)(dian)流(liu)(liu)表(biao)測(ce)量(liang)電(dian)(dian)(dian)(dian)流(liu)(liu)，根(gen)據歐姆定(ding)律即可(ke)算出被測(ce)電(dian)(dian)(dian)(dian)阻值(zhi)，值(zhi)得注意的是，電(dian)(dian)(dian)(dian)流(liu)(liu)表(biao)和電(dian)(dian)(dian)(dian)壓表(biao)自身也有電(dian)(dian)(dian)(dian)阻，會對變壓器(qi)的直流(liu)(liu)電(dian)(dian)(dian)(dian)阻測(ce)量(liang)結果產生誤差，不建(jian)議(yi)使用(yong)
平衡(heng)(heng)電(dian)橋(qiao)(qiao)法，常用的平衡(heng)(heng)電(dian)橋(qiao)(qiao)包括單臂電(dian)橋(qiao)(qiao)和雙(shuang)臂電(dian)橋(qiao)(qiao)，這種測(ce)量(liang)方(fang)法需(xu)要斷電(dian)，同(tong)時拆去高壓(ya)引線。然而，此(ci)種方(fang)法在每(mei)次測(ce)量(liang)時都需(xu)要花費很(hen)長時間來等待電(dian)流表和電(dian)壓(ya)表穩定(ding)，導致(zhi)試驗(yan)的效率低下，耗費時間長
除了(le)采(cai)用傳統的(de)(de)(de)(de)壓(ya)降法和電(dian)(dian)(dian)(dian)(dian)橋(qiao)法以外，可以直(zhi)接(jie)采(cai)用變壓(ya)器(qi)(qi)(qi)(qi)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)快(kuai)速(su)(su)測試(shi)(shi)儀(yi)進(jin)行(xing)(xing)試(shi)(shi)驗(yan)(yan)。直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)組快(kuai)速(su)(su)測試(shi)(shi)儀(yi)采(cai)用新(xin)的(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)技(ji)(ji)術，解決了(le)電(dian)(dian)(dian)(dian)(dian)橋(qiao)法測試(shi)(shi)速(su)(su)度慢的(de)(de)(de)(de)弊(bi)端。同時自身具(ju)(ju)(ju)備自動消弧功能(neng)和自動校準功能(neng)，解決了(le)壓(ya)將法的(de)(de)(de)(de)測量(liang)(liang)不準確的(de)(de)(de)(de) SXZR-10A變壓(ya)器(qi)(qi)(qi)(qi)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)組快(kuai)速(su)(su)測試(shi)(shi)儀(yi)可檢(jian)測變壓(ya)器(qi)(qi)(qi)(qi)，互感(gan)(gan)器(qi)(qi)(qi)(qi)，電(dian)(dian)(dian)(dian)(dian)抗器(qi)(qi)(qi)(qi)操作機構等(deng)感(gan)(gan)性(xing)線(xian)(xian)圈(quan)制造(zao)中半成(cheng)品，成(cheng)品出(chu)廠試(shi)(shi)驗(yan)(yan)，安(an)裝，交接(jie)試(shi)(shi)驗(yan)(yan)及(ji)(ji)電(dian)(dian)(dian)(dian)(dian)力(li)部門(men)預防(fang)性(xing)試(shi)(shi)驗(yan)(yan)的(de)(de)(de)(de)測項目，能(neng)有(you)效發現感(gan)(gan)性(xing)線(xian)(xian)圈(quan)的(de)(de)(de)(de)選材，焊接(jie)，連接(jie)部位松動，缺股(gu)，斷線(xian)(xian)等(deng)制造(zao)缺陷和運行(xing)(xing)后存在的(de)(de)(de)(de)隱患。為了(le)滿足感(gan)(gan)性(xing)線(xian)(xian)圈(quan)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)快(kuai)速(su)(su)測量(liang)(liang)的(de)(de)(de)(de)需要儀(yi)器(qi)(qi)(qi)(qi)采(cai)用全新(xin)電(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)技(ji)(ji)術，具(ju)(ju)(ju)有(you)體積(ji)小，重量(liang)(liang)輕，輸出(chu)電(dian)(dian)(dian)(dian)(dian)流(liu)大，量(liang)(liang)程寬，數(shu)字顯示(shi)(shi)，內部鋰電(dian)(dian)(dian)(dian)(dian)池(chi)供(gong)電(dian)(dian)(dian)(dian)(dian)等(deng)特(te)點。整機由單機片控制，自動完成(cheng)自檢(jian)，數(shu)據處理(li)，顯示(shi)(shi)等(deng)功能(neng)，具(ju)(ju)(ju)有(you)自動放(fang)電(dian)(dian)(dian)(dian)(dian)和放(fang)電(dian)(dian)(dian)(dian)(dian)指示(shi)(shi)功能(neng)。技(ji)(ji)術上(shang)采(cai)用“四端"測量(liang)(liang)，消除引線(xian)(xian)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)與接(jie)觸引起的(de)(de)(de)(de)測量(liang)(liang)誤差(cha)。是(shi)測量(liang)(liang)電(dian)(dian)(dian)(dian)(dian)力(li)變壓(ya)器(qi)(qi)(qi)(qi)及(ji)(ji)大型電(dian)(dian)(dian)(dian)(dian)機等(deng)各種(zhong)感(gan)(gan)性(xing)負載電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)及(ji)(ji)低壓(ya)開關接(jie)觸電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)，電(dian)(dian)(dian)(dian)(dian)線(xian)(xian)電(dian)(dian)(dian)(dian)(dian)纜或焊接(jie)口電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)(de)理(li)想儀(yi)器(qi)(qi)(qi)(qi)，其測量(liang)(liang)速(su)(su)度比電(dian)(dian)(dian)(dian)(dian)橋(qiao)快(kuai)一(yi)百(bai)多倍
功能特點
輸(shu)出電流大，范圍寬，速度快(kuai)，體積小，重量輕，操(cao)作簡單；
具有完(wan)善的(de)保(bao)護電路和放電報(bao)警(jing)功能，減(jian)少誤操作，可靠性強
采用高(gao)速微(wei)控制器(qi)，自動完成穩流(liu)判斷，數(shu)據采集(ji)和阻值顯示
儀器采用交直流(liu)兩種模(mo)式;采用16Ah大容量電池，繼續測試可(ke)達8小時
測試過(guo)程(cheng)由(you)微機(ji)控制，自動完成自校，穩流判斷，數(shu)據處(chu)理，阻(zu)值(zhi)顯示(shi)
自動切(qie)換交(jiao)流(liu)與(yu)直流(liu)供電，具有充電指示(shi)功能(neng)，過充保護
對于有載調壓變壓器(qi)直流(liu)電阻的(de)縱(zong)向測試可一次供電完(wan)成
適(shi)用(yong)于110KV及以(yi)下電壓等級變壓器的直流電阻快速測量
可(ke)根據(ju)負載情選擇不同檔位輸出電流(liu)，可(ke)選輸出3~50A電流(liu)
儀器(qi)測量(liang)范圍寬，0.001Ω~50KΩ
采用(yong)了大屏幕(mu)漢字顯示，菜單操作(zuo)界面友好，一目了然，方便(bian)操作(zuo)
可存儲500組測(ce)量數據，微型熱(re)敏(min)式打(da)印(yin)機(ji)現(xian)場隨(sui)時(shi)打(da)印(yin)實時(shi)數據
通過RS232串(chuan)行口對設備內(nei)數據進(jin)行管(guan)理，實現(xian)無紙(zhi)化辦公(gong).
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