在三相直流電阻平(ping)(ping)(ping)衡(heng)的情況(kuang)下,當出現(xian)三相運行電流不(bu)平(ping)(ping)(ping)衡(heng)時(shi)(shi),應檢三相端電壓是否平(ping)(ping)(ping)衡(heng)。電壓的輕微不(bu)平(ping)(ping)(ping)衡(heng)能(neng)引起電流的極大不(bu)平(ping)(ping)(ping)衡(heng),一般情況(kuang)下空載時(shi)(shi)不(bu)平(ping)(ping)(ping)衡(heng)大,滿(man)載時(shi)(shi)不(bu)平(ping)(ping)(ping)衡(heng)小;滿(man)載時(shi)(shi)不(bu)平(ping)(ping)(ping)衡(heng)度不(bu)超(chao)過10%時(shi)(shi),可正常運行。
當發現三相(xiang)電(dian)(dian)流不(bu)(bu)平衡(heng)(heng)時,可以用雙(shuang)臂電(dian)(dian)橋測量電(dian)(dian)機的三相(xiang)直流電(dian)(dian)阻是否平衡(heng)(heng),如果三相(xiang)直流電(dian)(dian)阻平衡(heng)(heng),則不(bu)(bu)屬(shu)于電(dian)(dian)機質(zhi)量問(wen)題,需要(yao)查找(zhao)電(dian)(dian)源(yuan)和電(dian)(dian)氣控制系統原因。