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。
It will produce magnetic field due to affection by direct current welding power supply during the welding of spiral submerged arc welded pipe. It will still remain residual magnetic.
螺旋埋弧焊钢管焊接过程中因直流焊接电源的影响会产生磁场，焊接结束后仍有剩磁存在。
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