1、萬用表測電流
三相不平衡率不大于10%；
2、搖表測絕緣
每相對地、相間均不小于0.5兆；
3、電橋測直流電阻
三相不平衡率不大于2%；
首先用萬用表去量(liang)(liang)(liang)電(dian)(dian)(dian)(dian)壓(ya)以(yi)及電(dian)(dian)(dian)(dian)阻(zu)，首先在電(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)源(yuan)側UVW三(san)相(xiang)中選取兩相(xiang)，測量(liang)(liang)(liang)一下兩端電(dian)(dian)(dian)(dian)壓(ya)是(shi)否為380v，由于電(dian)(dian)(dian)(dian)網中有時電(dian)(dian)(dian)(dian)壓(ya)不穩(wen)定導致(zhi)的(de)。依次(ci)測量(liang)(liang)(liang)UV，VW，UW三(san)相(xiang)電(dian)(dian)(dian)(dian)源(yuan)。當電(dian)(dian)(dian)(dian)源(yuan)側測量(liang)(liang)(liang)完成之(zhi)(zhi)后(hou)測量(liang)(liang)(liang)負載端，測量(liang)(liang)(liang)uv，vw，uw這三(san)相(xiang)之(zhi)(zhi)間的(de)電(dian)(dian)(dian)(dian)阻(zu)是(shi)否相(xiang)同，如果(guo)發現(xian)其中有一對電(dian)(dian)(dian)(dian)阻(zu)偏離較大則有可(ke)能是(shi)電(dian)(dian)(dian)(dian)機(ji)燒(shao)(shao)毀(hui)了(le)。然后(hou)測其中一相(xiang)對地的(de)電(dian)(dian)(dian)(dian)阻(zu)是(shi)否為0，這樣就可(ke)以(yi)判斷電(dian)(dian)(dian)(dian)機(ji)是(shi)否燒(shao)(shao)毀(hui)了(le)。