NDLI: Evaluation of the Reliability of Insulating Gases for the Bushing in Cryogenic Environment

Content Provider	IEEE Xplore Digital Library
Author	Woo-Ju Shin Jae-Sang Hwang Jae-Kyu Seong In-Jin Seo Yong-Han Kim Bang-Wook Lee
Copyright Year	2002
Abstract	Conventional high-voltage bushings, which adopt SF₆ gas as an insulation media, cannot be directly applied in cryogenic environment due to the liquefaction of SF₆ gas. In our previous study, it was shown that SF₆ gas could not be used as an insulation gas in cryogenic environment, but instead, CF₄ gas has shown excellent insulation properties with little liquefaction phenomena, and have a possibility to be applied for the insulation gas for high-voltage bushings in cryogenic environment. However, in order to apply CF₄ gas for cryogenic bushing, it should be determined whether CF₄ gas can maintain its insulation characteristics in long-term operation. In order to reveal the long-term insulation properties of various gases, which have a possibility to be applied in high-voltage bushings in cryogenic environment, the long-term breakdown characteristics of CF₄ gas, SF₆ gas, N₂ gas, and dry-air were compared over time in a cryogenic environment. For an experiment, a high-vacuum cryostat and a cryo-cooler were prepared to prevent the evaporation of liquid nitrogen for long-term duration. An fiberglass reinforced plastics bushing was installed on the cryostat to apply high voltage up to 60 kV. A rod to plane electrode was set in a cryostat to determine the breakdown voltage of insulating gases. The lightning impulse and ac overvoltage tests have been performed and the test results were analyzed. From the test, the reduction of breakdown voltage of CF₄ gas were observed as time passed by, and it was more severe in SF₆ . However, stable breakdown characteristic have been shown with N₂ gas. Therefore, increasing the pressure of N₂ would be a viable option for increasing the breakdown voltage in a cryogenic environment.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	7700704
Ending Page	7700704
Page Count	1
File Size	859152
File Format	PDF
ISSN	10518223
Volume Number	23
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sulfur hexafluoride Electric breakdown Cryogenics Insulators Nitrogen superconducting equipment Cryogenic bushing high voltage liquid nitrogen long-term breakdown
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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