Electrical breakdown of vacuum insulation at cryogenic temperature
- Dept. of Electrical Engineering, Tsinghua Univ., Beijing (CN)
A breakdown experiment of vacuum insulation for the development of cryocables and other cryogenic electrical apparatus was performed. The influence of conditioning, pressure, gap spacing, electrode material and voltage waveshape on the breakdown voltage of vacuum insulation was measured at room temperature and at cryogenic temperature respectively. The results indicate that cooling the HV sphere electrode enhances the breakdown strength of vacuum insulation, and in general, almost all effects of electrical breakdown of vacuum insulation at room temperature are reproduced at cryogenic temperature at somewhat higher voltage, the close correlation between the low-temperature and room-temperature breakdown voltages of large vacuum gaps can be explained from the point of view of microparticle-initiated breakdown theory.
- OSTI ID:
- 6632699
- Journal Information:
- IEEE Transactions on Electrical Insulation (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Electrical Insulation (Institute of Electrical and Electronics Engineers); (USA) Vol. 25:3; ISSN IETIA; ISSN 0018-9367
- Country of Publication:
- United States
- Language:
- English
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BREAKDOWN
CABLES
CONDUCTOR DEVICES
CRYOGENIC CABLES
CRYOGENICS
DATA
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATION
ELECTRODES
EQUIPMENT
EXPERIMENTAL DATA
INFORMATION
MATERIALS TESTING
NUMERICAL DATA
TESTING