三相异步电动机测量电压时三相电压是平衡的但是三相电流不平衡 这样 380V电压，三相异步电动机在运行时三相电流偏差的允许范围值...
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首先，电机的绕组阻抗不可能一模一样的，
其次，接触器的触点在吸合时的松紧程度，接触面也不是一模一样的，
以上两个原因都会导致电流的不一致。
不同供电系统.不同绕组连接形式.绕组接地点不同.有不同的表象.如图示:
1>e点接地.电机电压.电流无变化.输出功率正常.
2>d点接地.c相电压加在绕组cd段.至电流大继发生接地短路.烧坏电机.保护动作前.电机会发生震动.丢速.冒烟等现象.
3>f角型接法的电机.一旦接地.会使三相电流不平衡.很快烧坏电机.
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绛旓細380V)脳绾跨數娴両脳鍔熺巼鍥犳暟COS桅銆涓夌浉鐢鐢靛櫒鐨勬诲姛鐜囩瓑浜庯細3*鐩鐢靛帇*鐩哥數娴*鍔熺巼鍥犳暟COS桅銆怭=3脳鐩哥數鍘婾(220V)脳鐩哥數娴両脳鍔熺巼鍥犳暟COS桅銆戝崟鐩哥數涓殑鐢靛姛鐜囩殑璁＄畻鍏紡锛氱數鍘婾*鐢垫祦I銆怭=U脳I銆戞槦褰㈢殑鐩哥數鍘嬫槸姣忛」鐏嚎瀵瑰湴绾夸负220V锛岀嚎鐢靛帇鏄疉BC涓夌浉鐏嚎鍒嗗埆闂寸殑鐢靛帇涓380V銆
