We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Dielectric Properties of Mica-Alumina Combined Insulation at High Temperatures.
- Authors
Ishida, M.; Y. Ikeda; Naohara, N.; Mitsui, H.; Kumazawa, R.; Kuroki, T.
- Abstract
Development of sodium-immersed-type Electromagnetic Pumps (EMP) is expected to improved reliability, safety, maintainability, and construction cost of the Fast Breeder Reactor (FBR) compared with the conventional mechanical pumps. To realize the EMP, establishment of a high-temperature-resistant electrical insulating system is indispensable. A mica-alumina combination is selected for the insulating system at temperatures higher than 500°C. Using this insulating system, an aging pretest was performed. The aging condition was to apply 1.5-kV ac voltage in the nitrogen atmosphere at 550°C for 4000 hours. The dielectric properties before and after the aging were measured to understand the tendency of temporal change in the aging. In this result, the dielectric after aging was improved compared with the initial performance. The curious phenomenon was clarified to be caused by a decrease of organic component in the insulation, which remained due to incomplete burning. Also, the possibility of thermal runaway was considered to be higher as a dielectric breakdown mechanism.
- Subjects
ELECTROMAGNETIC pumps; ELECTRIC pumps; ALUMINUM oxide; CONSTRUCTION costs; CONSTRUCTION materials; ELECTRIC insulators &; insulation; DIELECTRICS; ELECTRICAL engineering materials
- Publication
Electrical Engineering in Japan, 1996, Vol 116, Issue 3, p14
- ISSN
0424-7760
- Publication type
Article
- DOI
10.1002/eej.4391160302