NDLI: Experimental Study on the Barrier Effects in Gaseous Helium for the Insulation Design of a High Voltage SFCL

Content Provider	IEEE Xplore Digital Library
Author	Hyoungku Kang Jin Bae Na Yoon Do Chung Tae Kuk Ko
Copyright Year	2002
Abstract	It has been widely established that gaseous helium (GHe) can be injected into a sub-cooled liquid nitrogen (LN₂) cooling system to control the pressure of such a system because of its non-condensing characteristics. A sub-cooled LN₂ cooling system is known as one of the most promising method to develop a large scale superconducting machine. Unfortunately, the electrical breakdown voltage of GHe is not good enough for developing a high voltage electric machine such as a superconducting fault current limiter (SFCL). To enhance the dielectric characteristics of current leads placed in GHe, the use of solid barriers is regarded as an efficient method. In this study, experiments are made on the dielectric characteristics of GHe and the barrier effects and results are analyzed in order to improve the dielectric performance of a high voltage SFCL using a sub-cooled LN₂ cooling system. The dielectric experiments of the energized sphere and the grounded plane in GHe are examined according to various pressures with a solid insulating barrier. The dielectric experiments are performed by installing barriers made of glass fiber reinforced plastics (GFRP) between two electrodes and the electrical breakdown voltage according to the pressure of GHe and the position of a barrier is observed. As a result, it is found that the position of a solid barrier and the pressure of GHe are important in enhancing the dielectric characteristics of a sphere-to-plane electrode system with quasi-uniform field.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1328
Ending Page	1331
Page Count	4
File Size	367998
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electrodes Solids Dielectrics Insulation Breakdown voltage Discharges Cooling sub-cooled liquid nitrogen Barrier effect electrical breakdown gas insulation high voltage superconducting apparatus
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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