A sub-cooled liquid nitrogen system is known to be a promising method to develop a high voltage superconducting magnet. Therefore, the investigation of dielectric characteristics of gaseous electrical insulation media is important for the design of a high voltage superconducting apparatus. In this paper, dielectric characteristics of various gases according to utilization factors (ξ) are investigated for the establishment of insulation design criteria of a high voltage superconducting apparatus. Dielectric experiments on gaseous nitrogen (GN2) and gaseous helium (GHe) are carried out by using several kinds of sphere-to-plane electrode systems made of stainless steel. As a result, it is found that the dielectric characteristics of gas are determined by ξ as well as gap length of electrode systems. Also, empirical expressions for electrical breakdown performance of gaseous electrical insulation media are derived and formulated. It is considered that the results of the study would be applicable to designing a high voltage superconducting apparatus.
Bibliographical noteFunding Information:
Manuscript received October 20, 2009. First published March 25, 2010; current version published May 28, 2010. This work was supported in part by a Grant from the center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Education, Science and Technology, Republic of KOREA. This research was supported by a Grant from the Academic Research Program of Chungju National University in 2009. Hyoungku Kang is with the Department of Electrical Engineering, Chungju National University, Chungju 380-702, Korea (e-mail: firstname.lastname@example.org). Jin Bae Nah and Tae Kuk Ko are with the Electrical Engineering, Yonsei University, Seoul 120-749, Korea. Yoon Do Chung is with the Industry Administration Institute, College of Engineering, The University of Suwon, Gyeonggido 445-743, Korea. Min Cheol Ahn is with the Electrical Engineering Department, Kunsan National University, Cheollabukdo, Korea. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2010.2041342
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering