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Analysis of the Dielectric Characteristics of Gaseous Nitrogen According to Various Temperatures and Pressures for a Magnet System

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Abstract

Gaseous nitrogen (GN 2) is used as an insulation and pressurization material for developing a high-voltage superconducting magnet system utilizing liquid nitrogen (LN 2) cooling. In a LN 2 cooling system, current leads for a high-voltage superconducting magnet are exposed to GN 2 to temperatures that can range from 65 to 300 K. Therefore, a study on the electrical breakdown and partial discharge inception voltage test was performed considering the temperature and pressure variation of GN 2. The dielectric characteristics of GN 2 were observed to improve as the temperature and pressure increased. In addition, the partial discharge inception voltage was similar to the behavior of dielectric breakdown voltage with respect to temperature and pressure. To confirm a functional relationship between the breakdown voltage and effect of the electrode surface area, experimental results were summarized using a field utilization factor. The dielectric breakdown voltage was found dependent on the field utilization factor. Consequently, the dielectric breakdown voltage of GN 2 could be expressed as a function of field utilization factor according to temperature and pressure.

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Acknowledgments

This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2015M1A7A1A0205725).

This work was supported by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20164030201100).

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Authors and Affiliations

  1. Yonsei University, 120-749, Seoul, Republic of Korea

    Seokho Nam, Woo Seung Lee & Tae Kuk Ko

  2. Korea National University of Transportation, 380-702, Chungju-si, Republic of Korea

    Hongseok Lee, Jong O Kang, Junil Kim, Young Kyu Mo, Seungmin Bang, Onyou Lee & Hyoungku Kang

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  1. Seokho Nam
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  2. Woo Seung Lee
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  8. Onyou Lee
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  9. Hyoungku Kang
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  10. Tae Kuk Ko
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Correspondence to Hyoungku Kang.

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Nam, S., Lee, W.S., Lee, H. et al. Analysis of the Dielectric Characteristics of Gaseous Nitrogen According to Various Temperatures and Pressures for a Magnet System. J Supercond Nov Magn 30, 2347–2352 (2017). https://doi.org/10.1007/s10948-016-3753-2

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  • DOI: https://doi.org/10.1007/s10948-016-3753-2

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