某发电厂大修期间,在对发电机和高压电动机进行定子绕组的耐压试验中,利用日盲紫外成像仪对电机定子绕组进行了放电检测,并与传统预防性试验方法数据进行了对比分析。研究表明绝缘状态良好的发电机,在直流和交流耐压试验中紫外成像仪都未观测到放电现象,同时其预防性试验数据也符合规程要求;而定子绕组存在老化的电动机,在直流耐压试验中,在低于额定工作电压时,即可观测到较明显的放电,光斑面积随电压的增加而明显增大,泄漏电流与电压 During the overhaul of a power plant, the stator windings of the generator and the high-voltage motor were tested for the voltage drop by means of a solar-blind UV imager and compared with the traditional preventive test data. The research shows that the generator with good insulation condition has no discharge phenomenon observed in UV and AC voltage withstand tests and the preventive test data also meets the requirements of the regulations. However, the aging of the stator windings exists in the DC voltage withstand Test, below the rated voltage, you can observe a more obvious discharge, the spot area increases with the voltage increased significantly, the leakage current and voltage