Identification of slot discharges in rotating machine insulation system using variable frequency PD measurement

作     者：Ramesh P.Nair Sumangala B.Vishwanath Nageshwar B.Rao 

作者机构：Cables and Diagnostics DivisionCentral Power Research InstituteBengaluruIndia Dr.Ambedkar Institute of TechnologyBengaluruIndia 

出 版 物：《High Voltage》 (高电压（英文）)

年 卷 期：2018年第3卷第3期

页      面：179-186页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Central Power Research Institute 

主　　题：steel rotating insulation 

摘      要：Slot discharge studies are very important from the insulation diagnosis *** in practice,testing of rotating machines with power frequency requires sources which are quite bulky and *** if the diagnosis is carried out at lower frequencies(50 Hz),the size and cost of the test source can be reduced ***,it is important to know whether the study at low frequencies can be considered equivalent to study at power ***,in this study,a slot discharge phenomenon occurring in a rotating machine insulation system was investigated experimentally at different frequencies(50,10,1 and 0.1 Hz).Slot discharges are known to have a distinct phase resolved partial discharge pattern for power frequency(50/60 Hz)*** distinct patterns are useful in identifying the presence of slot discharge activity in rotating *** discharges were created on a 6.6 kV mica-epoxy stator coil and the slot discharge characteristics measured at different frequencies are *** discharge measurements were repeated by varying the air gap between the insulation surface and grounded steel *** changes in slot discharge characteristics due to the increase in air gap were found similar at all *** comparison suggests that the identification of slot discharge is also possible from the partial discharge(PD)measurement at low frequencies.