Checking and analysis revealed at last, that it was caused by residual magnetism after repair, the polarity of which was opposite to that effected by direct current in the rofor.

• 在水力发电公司检修时,几次碰到发电机不能启励建压的情况,经过检查分析,最终确定为剩磁的原因,主要是检修后剩磁的极性与转子直流电产生的极性相反造成的。