气压和湿度对水轮发电机定子线棒端部局部放电特性的影响OA

The partial discharge intensity at the end of hydro generator stator bars at high altitude is affect-ed by environmental parameters such as air pressure and humidity.Therefore,the author designed and fabricated the F-class 10 kV hydro generator stator bar end main insulation internal air gap defect mod-el,anti-scorch layer detachment defect model,and the main insulation wear and oil defect model,and carried out the study of the discharge characteristics of the three defect models.Based on the pulsed-current method and the ozone detection method,the partial discharge test under different air pressure and humidity conditions is carried out,and investigate the effect of air pressure and humidity on the defective parts of the stator bar end.The results show that the decrease of air pressure will significantly aggravate the discharge intensity of different defect types,but the effect of air pressure on the internal air gap de-fects is smaller;the increase of humidity will significantly slow down the development of the discharge process of each defect type,and the external insulation defects are more inhibited,compared to the change of air pressure on the defective parts of the localized discharge is greater than the change of hu-midity.For different types of defects,the ozone concentration varies significantly,and it is feasible to use the ozone concentration to judge the partial discharge intensity,but the low-pressure and high-humidi-ty environments promote the decomposition of ozone while decreasing the ozone generation rate,resulting in the overall ozone concentration being at a low level.The results of the study can provide a reference for improving the online monitoring level of partial discharges in stator bars of hydropower stations at high al-titude and the insulation assessment capability.