6SN1118-0DJ21-0AA1 电动机绝缘电阻合格要求？

a） 高压电动机定子线圈用2500V兆欧表测量，其绝缘电阻值不低于每千伏1MΩ；

b） 低压电动机定子线圈用500V兆欧表测量，电阻值不低于0.5MΩ；

c） 直流电动机定子线圈用1000V兆欧表测量，电阻值不低于0.5MΩ；

d） 所测量的数值应与以前同温度时的数值相比较，若低于以前所测数值的70%时，应查明原因。

e）吸收比R60“/R15”，比值不低于1.3。

电机绝缘测量方法

第一步正确选择其电压和测量范围

兆欧表不能乱用，要根据其测量设备电压进行选择。通常500V以下至100V电气设备或回路，采用500V 100M?及以上兆欧表，如果测量电机绝缘电阻，选用500V 100M?的兆欧表。

电动机绝缘检查方法图1

第二步兆欧表自检测

在测量前，兆欧表先做一次开路实验，然后再做一次两表线（L和E）接通实验。指针在开路实验中应指到“∞”（无穷大）

而在两表线直接接通实验时，指针能摆到“0”处，就表明兆欧表工作状态正常。如图3所示

第三步检查前电动机准备工作

测量电机绕组绝缘前，切断总电源挂检修牌，防止触电隐患。拆掉电机三相电源线做好标记以备恢复，拆掉电机接线柱中连接片（连接片必须要拆除，否则测量相间绕组无法测量）。

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