Coil tests of partially conduction filler materials for generator stator coils
- Westinghouse Science and Technology Center, Pittsburgh, PA (United States)
- Westinghouse Power Generation Business Unit, Orlando, FL (United States)
Power factor tip-up, i.e., increasing power factor with increasing voltage, is commonly observed in generator stator coils and is usually attributed to partial discharge activity in the coil insulation system. A major contributor to partial discharge activity is the discharge of voids in the insulating Roebel filler material used in the coil top and bottom. In measurements on aluminum test bars, the authors have previously shown that use of partially conducting material results in a significant reduction in the partial discharge and lower power factor tip-up. More recently, the authors have extended this work to coil sections and full-size coils. Comparison tests were conducted on full-size coil sections using an insulating Roebel filler and a partially conducting Roebel filler based on poly(pyrrole). Significant reduction in power factor tip-up resulted when using the conductive Roebel filler. The tip-up was related to the coil construction, and to the conductivity of the Roebel filler material.
- OSTI ID:
- 524609
- Report Number(s):
- CONF-960614-; ISBN 0-7803-3531-7; TRN: IM9740%%83
- Resource Relation:
- Conference: 1996 IEEE international symposium on electrical insulation, Montreal (Canada), 16-19 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of Conference record of the 1996 IEEE international symposium on electrical insulation. Volume 1; PB: 475 p.
- Country of Publication:
- United States
- Language:
- English
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