在電(dian)力(li)(li)變(bian)(bian)壓(ya)(ya)器的(de)(de)(de)(de)半成品(pin)、成品(pin)生產過程中(zhong)，新安裝的(de)(de)(de)(de)變(bian)(bian)壓(ya)(ya)器投入運行(xing)之前以(yi)及(ji)電(dian)力(li)(li)系統中(zhong)變(bian)(bian)壓(ya)(ya)器運行(xing)過程中(zhong)根(gen)據國(guo)家電(dian)力(li)(li)部的(de)(de)(de)(de)預防性試(shi)驗規程中(zhong)，要(yao)(yao)求對運行(xing)的(de)(de)(de)(de)變(bian)(bian)壓(ya)(ya)器定(ding)期(qi)進行(xing)匝數(shu)比(bi)或電(dian)壓(ya)(ya)比(bi)測(ce)試(shi)。傳(chuan)統的(de)(de)(de)(de)變(bian)(bian)比(bi)電(dian)橋(qiao)操作(zuo)繁(fan)瑣，讀數(shu)不直觀(guan)，且要(yao)(yao)進行(xing)必要(yao)(yao)的(de)(de)(de)(de)換算，測(ce)試(shi)結(jie)果只為一相變(bian)(bian)比(bi)的(de)(de)(de)(de)資料。變(bian)(bian)比(bi)測(ce)試(shi)儀克(ke)服(fu)了傳(chuan)統變(bian)(bian)比(bi)電(dian)橋(qiao)測(ce)試(shi)的(de)(de)(de)(de)缺點。屏(ping)幕采用(yong)一次完成三相變(bian)(bian)比(bi)測(ce)試(shi)，測(ce)試(shi)速度快，準確度高。