大型发电机定子绕组端部电位分布

DISTRIBUTION OF ELECTRIC FIELD AT THE WINDING END OF GENERATOR STATOR

发电机定子端部电场分布不均匀,易发生电晕造成事故。目前采用在发电机定子端部涂电阻率不同的半导体层来改善其电场分布,但涂后改善的效果无法定量评估。笔者通过测试,研究了发电机定子端部电位分布,分析了目前所采用的防晕方法的效果,并提出了改善意见。

It is subject to producing corona and causing accident due to non-uniform distribution of electric field at the winding end of generator stator.Although the distribution of electric field is in-tended to be improved by coating some semiconductor layers at the winding ends,it is difficult to evaluate the effect quantitatively.This paper studies the potential distribution by experiment,analyzes the effect of the current method against corona and gives some sugges-tion for improvement.