1. Insulation Problems in Medium-Voltage Stator Coils Under Fast Repetitive Voltage Pulses.
- Author
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Ui Haq, Saeed, Jayaram, Shesha H., and Cherney, Edward A.
- Subjects
VARIABLE speed drives ,POWER transmission ,ELECTRIC variable speed driving ,CONVERTERS (Electronics) ,DIELECTRIC heating ,ELECTRIC insulators & insulation ,INDUCTION motors ,ELECTRIC discharges ,ELECTRIC potential - Abstract
In this paper, the degradation processes in stator-bar groundwall insulation that is subjected to steep-front voltage pulses, at different temperatures, are studied. The test conditions include pulse voltage amplitudes up to 6 kV
p and pulse switching frequencies up to 3 kHz in ambient temperatures of 23°C, 120 °C, and 155 ° C. During the aging process, the surface temperature is monitored with an infrared camera to determine the regions with highest temperatures and the partial discharge (PD) activity. The visual examination of failed bars confirmed that the groundwall insulation in these regions is degraded. [ABSTRACT FROM AUTHOR]- Published
- 2008
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