隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)的(de)(de)(de)原理和普通變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)的(de)(de)(de)原理是(shi)(shi)一樣的(de)(de)(de)。都(dou)是(shi)(shi)利用(yong)電(dian)(dian)磁感應(ying)原理。隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)一般是(shi)(shi)指1：1的(de)(de)(de)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)。由于次(ci)級不(bu)(bu)和地相連。次(ci)級任一根線(xian)與地之間(jian)沒有電(dian)(dian)位差。使(shi)用(yong)安全(quan)。常用(yong)作(zuo)維(wei)修(xiu)電(dian)(dian)源。隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)不(bu)(bu)全(quan)是(shi)(shi)1：1變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)。控制變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)和電(dian)(dian)子管(guan)設備的(de)(de)(de)電(dian)(dian)源也是(shi)(shi)隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)。如電(dian)(dian)子管(guan)擴(kuo)音機(ji)，電(dian)(dian)子管(guan)收音機(ji)和示波(bo)器(qi)(qi)和車床(chuang)控制變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)等電(dian)(dian)源都(dou)是(shi)(shi)隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)。如為了安全(quan)維(wei)修(xiu)彩電(dian)(dian)常用(yong)1比(bi)1的(de)(de)(de)隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)。隔(ge)離(li)(li)變(bian)(bian)(bian)(bian)壓(ya)器(qi)(qi)是(shi)(shi)使(shi)用(yong)比(bi)較多的(de)(de)(de)，在空調中也是(shi)(shi)使(shi)用(yong)的(de)(de)(de)。 

       變壓器組件長時間的短路電流是造成運行短路的主要原因。變壓器組件一般情況下，當在電流速斷保護范圍內發生短路故障時，繼電保護裝置能夠保證在無延時情況下迅速切除故障，考慮到機械作用固有延時等情況，短路電流持續的時間一般不會超過250ms，但是實際情況卻與此有所不同：首先，由于繼電保護的選擇性，配電側的保護一般不采用電流速斷保護，而是采用定時限過電流保護，配電側也正是短路多發部分；其次，繼電保護雖然要求速動性、選擇性、靈敏性和可靠性，可是也不免發生繼電保護裝置拒動的情況，而當保護拒動時，故障存在時間會較長。