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MX+0F 26948

定子繞組匝間短路故障的判斷

定子繞組匝間短路故障，一般是通過測量三相繞組的直流電阻來判斷的。但容量較大的電機定子繞組直流電阻很小，加上儀表精度及測量誤差等關系的影響，不易得出正確的判斷，但可以采用如下辦法來判斷。

不分解電機，用一臺容量適當?shù)膯蜗嘧择钫{壓器，從零開始逐步升壓，向其中一相通入低壓交流電。同時，用一只鉗形電流表測量電流，使電流上升到電機額定電流的1/3左右。然后停止升壓，用萬用表分別測量其它兩相感應電壓，如果某一相有匝間短路故障，它的感應電壓就比另一相低。然后調換一相通電，用同樣的方法測量其它兩相的感應電壓。根據(jù)感應電壓是否相同，可判斷出是否有匝間短路故障。定子匝間短路故障，在維修中一般需要更換電機繞組。

鼠籠條斷條的判斷

籠型轉子斷條后，一般是空載運行正常，但一加上負載，電機轉速就降低，定子電流增大，電機振動，溫度增高，并且會伴有不正常的噪聲。負荷愈大，斷條愈多，上述現(xiàn)象愈嚴重。

判斷是否斷條的方法如下：

通電法：用一臺容量適當?shù)膯蜗嗾{壓器，向電機一相繞組通入低壓交流電。調壓器從零開始慢慢升壓，同時用鉗形電流表測量電流，使電流上升到電機額定電流的1/2左右時，停止升壓。然后用手慢慢轉動電動機的轉軸，觀察鉗形電流表的指針。如果指針不動或微微擺動，表明轉子完好，如果指針周期性擺動，而且擺動幅度較大，則表明轉子鼠籠條有斷條故障。

替代法：就是找一個與這臺電機同機座號，同鐵心號的電機轉子，替換安裝在這臺有故障的電機上。帶相同負載試車，上述故障全部消除。從而證明這臺電機的轉子鼠籠條確有問題。

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MX+0F 26948

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