Title :
Insulation Problems in Medium Voltage Stator Coils Under Fast Repetitive Voltage Pulses
Author :
Haq, Saeed U. ; Jayaram, Shesha H. ; Cherney, Edward A.
Author_Institution :
Univ. of Waterloo, Waterloo
Abstract :
In this research work, the degradation processes in stator bar groundwall insulation that is subjected to steep-front voltage pulses, at different temperatures, is studied. The test conditions include pulse voltage amplitudes up to 6 kVp, and pulse switching frequencies up to 3 kHz in ambient temperatures of 23degC, 120 degC, and 155 degC. During the aging process, the surface temperature is monitored with an infrared camera to determine the regions with the highest temperatures, and the partial discharge (PD) activity. The visual examination of failed bars confirmed that the groundwall insulation in these regions is degraded.
Keywords :
coils; machine insulation; partial discharges; stators; aging process; degradation processes; infrared camera; medium voltage stator coils; partial discharge; pulse switching frequencies; pulse voltage amplitudes; stator bar groundwall insulation; steep-front voltage pulses; temperature 120 degC; temperature 155 degC; temperature 23 degC; Aging; Coils; Degradation; Insulation; Medium voltage; Partial discharges; Stators; Switching frequency; Temperature; Testing; Adjustable speed drives; converters; dielectric heating; groundwall insulation; induction motor; partial discharge; pulse voltage; solid-state switches;
Conference_Titel :
Pulp and Paper Industry Technical Conference, 2007. Conference Record of Annual
Conference_Location :
Williamsburg, VA
Print_ISBN :
1-4244-1192-0
Electronic_ISBN :
0190-2172
DOI :
10.1109/PAPCON.2007.4286278
