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NU-NCM350-8

定子绕组匝间短路故障的判断

定子绕组匝间短路故障，一般是通过测量三相绕组的直流电阻来判断的。但容量较大的电机定子绕组直流电阻很小，加上仪表精度及测量误差等关系的影响，不易得出正确的判断，但可以采用如下办法来判断。

不分解电机，用一台容量适当的单相自耦调压器，从零开始逐步升压，向其中一相通入低压交流电。同时，用一只钳形电流表测量电流，使电流上升到电机额定电流的1/3左右。然后停止升压，用万用表分别测量其它两相感应电压，如果某一相有匝间短路故障，它的感应电压就比另一相低。然后调换一相通电，用同样的方法测量其它两相的感应电压。根据感应电压是否相同，可判断出是否有匝间短路故障。定子匝间短路故障，在维修中一般需要更换电机绕组。

鼠笼条断条的判断

笼型转子断条后，一般是空载运行正常，但一加上负载，电机转速就降低，定子电流增大，电机振动，温度增高，并且会伴有不正常的噪声。负荷愈大，断条愈多，上述现象愈严重。

判断是否断条的方法如下：

通电法：用一台容量适当的单相调压器，向电机一相绕组通入低压交流电。调压器从零开始慢慢升压，同时用钳形电流表测量电流，使电流上升到电机额定电流的1/2左右时，停止升压。然后用手慢慢转动电动机的转轴，观察钳形电流表的指针。如果指针不动或微微摆动，表明转子完好，如果指针周期性摆动，而且摆动幅度较大，则表明转子鼠笼条有断条故障。

替代法：就是找一个与这台电机同机座号，同铁心号的电机转子，替换安装在这台有故障的电机上。带相同负载试车，上述故障全部消除。从而证明这台电机的转子鼠笼条确有问题。

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NU-NCM350-8

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