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通常用(yong)的(de)交流電(dian)源電(dian)壓一根(gen)線和大地相連(lian)，另一根(gen)線與大地之間有220伏(fu)或380伏(fu)的(de)電(dian)位差。

        人接(jie)觸會產生(sheng)觸電(dian)(dian)(dian)(dian)。而(er)隔(ge)離(li)變壓(ya)(ya)器的(de)(de)(de)次級(ji)高低(di)壓(ya)(ya)線(xian)圈(quan)相互電(dian)(dian)(dian)(dian)氣絕緣，也不(bu)與(yu)大地相連，它的(de)(de)(de)任意(yi)兩線(xian)與(yu)大地之(zhi)間沒有電(dian)(dian)(dian)(dian)位差(cha)。人接(jie)觸任意(yi)一條線(xian)都(dou)不(bu)會發生(sheng)觸電(dian)(dian)(dian)(dian)，這(zhe)樣就比較安全。所以無論次級(ji)電(dian)(dian)(dian)(dian)壓(ya)(ya)是(shi)否(fou)超過了安全電(dian)(dian)(dian)(dian)壓(ya)(ya)值，只要(yao)人身(shen)不(bu)同時接(jie)觸次級(ji)的(de)(de)(de)兩個有電(dian)(dian)(dian)(dian)壓(ya)(ya)差(cha)的(de)(de)(de)輸(shu)出點，就不(bu)會造成傷害，這(zhe)是(shi)隔(ge)離(li)變壓(ya)(ya)器最大的(de)(de)(de)優點。