Title :
Partial discharge activity in high voltage stator coils
Author_Institution :
Power Generation Technol. Div., Westinghouse Electr. Corp., Orlando, FL, USA
Abstract :
Partial discharges (PD) within the insulation components of high voltage stator coils can cause damage over a period of time and can have a detrimental effect on such coils. Possible internal locations of PD in a stator coil are the groundwall insulation; the Roebel filler material; and between the interface of the uninsulated bar and groundwall insulation. Of these three, it was found that Roebel filler can be the largest contributor to PD activity. This paper describes the testing and analysis that was done on experimental high voltage coils in order to obtain a better understanding of PD activity within the coil´s insulation system. Results are presented that show how corona probe measurements and power factor tip-up measurements were used in the detection and analysis of PD activity within a high voltage coil. The major factors that contribute to high levels of coil PD are presented, along with ways to reduce PD
Keywords :
coils; corona; high-voltage techniques; insulation testing; machine insulation; machine testing; partial discharges; power factor; power factor measurement; stators; voltage distribution; HV stator coils; PD activity; Roebel filler material; corona probe measurements; groundwall insulation; high voltage coils; insulation components; partial discharge activity; power factor tip-up measurements; testing; Coils; Corona; Insulation testing; Partial discharges; Power measurement; Probes; Reactive power; Stators; System testing; Voltage;
Conference_Titel :
Electrical Insulation, 1994., Conference Record of the 1994 IEEE International Symposium on
Conference_Location :
Pittsburgh, PA
Print_ISBN :
0-7803-1942-7
DOI :
10.1109/ELINSL.1994.401503