NDLI: Dielectric surface flashover in vacuum at cryogenic temperature (100 K)

Content Provider	IEEE Xplore Digital Library
Author	Neuber, A. Krompholz, H. Hatfield, L.L.
Copyright Year	1997
Description	Author affiliation: Dept. of Electr. Eng. & Phys., Texas Tech. Univ., Lubbock, TX, USA (Neuber, A.)
Abstract	Recent developments in high power systems use cryogenic components, where the performance of insulators at such low temperatures is unknown. In a fast coaxial setup, electrodes and dielectric sample are cooled to less than 100 K in vacuum, and the flashover initiation processes for gap distances on the order of 1 cm are characterized using fast electrical and optical diagnostics. As reported before, two development stages can be distinguished: a first phase with slowly rising current and the presence of free electrons, with a duration of 10-50 ns, and a second stage with a fast current rise due to gaseous ionization and collision dominated electrons. First experiments comparing cooled samples and samples at room temperature do not show discernible differences for Lexan. For Alumina, however, an increase of the duration of phase 1 is observed, with a higher current amplitude at the transition from phase one to phase two. Also, the current rise in phase two is reduced. These results indicate a temperature dependence of the electron induced outgassing process which is expected to cause the transition from phase one to phase two.
Starting Page	575
Ending Page	578
File Size	378789
Page Count	4
File Format	PDF
ISBN	0780338510
DOI	10.1109/CEIDP.1997.641139
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Cryogenics Temperature Electron emission Dielectrics and electrical insulation Electrodes Surface discharges Electric breakdown Breakdown voltage Transmission lines
Content Type	Text
Resource Type	Article

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