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

fYear

2007

fDate

24-28 June 2007

Firstpage

9

Lastpage

18

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Pulp and Paper Industry Technical Conference, 2007. Conference Record of Annual

Conference_Location

Williamsburg, VA

ISSN

0190-2172

Print_ISBN

1-4244-1192-0

Electronic_ISBN

0190-2172

Type

conf

DOI

10.1109/PAPCON.2007.4286278

Filename

4286278