6SN1118-0DJ21-0AA1 電動機絕緣電阻合格要求？
a） 高壓電動機定子線圈用2500V兆歐表測量，其絕緣電阻值不低于每千伏1MΩ；
b） 低壓電動機定子線圈用500V兆歐表測量，電阻值不低于0.5MΩ；
c） 直流電動機定子線圈用1000V兆歐表測量，電阻值不低于0.5MΩ；
d） 所測量的數值應與以前同溫度時的數值相比較，若低于以前所測數值的70%時，應查明原因。
e）吸收比R60“/R15”，比值不低于1.3。
電機絕緣測量方法
第一步正確選擇其電壓和測量范圍
兆歐表不能亂用，要根據其測量設備電壓進行選擇。通常500V以下至100V電氣設備或回路，采用500V 100M?及以上兆歐表，如果測量電機絕緣電阻，選用500V 100M?的兆歐表。
電動機絕緣檢查方法圖1
第二步兆歐表自檢測
在測量前，兆歐表先做一次開路實驗，然后再做一次兩表線（L和E）接通實驗。指針在開路實驗中應指到“∞”（無窮大）
而在兩表線直接接通實驗時，指針能擺到“0”處，就表明兆歐表工作狀態正常。如圖3所示
第三步檢查前電動機準備工作
測量電機繞組絕緣前，切斷總電源掛檢修牌，防止觸電隱患。拆掉電機三相電源線做好標記以備恢復，拆掉電機接線柱中連接片（連接片必須要拆除，否則測量相間繞組無法測量）。
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