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Experimental Study on Barrier Effects in Gaseous Nitrogen for the Development of a High-Voltage Superconducting Apparatus

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Abstract

A subcooled liquid nitrogen cooling system is known as the most promising method for developing a high-voltage superconducting apparatus, such as a superconducting fault current limiter, a superconducting transformer, and so on (Kang et al, IEEE Trans. Appl. Supercond. 18, (2), 628-631 2008). Gaseous nitrogen is injected into a superconducting magnet system to control the pressure and enhance the dielectric characteristics of a subcooled liquid nitrogen cooling system. In this case, the application of a solid insulating barrier between electrodes is regarded as an effective method to enhance the insufficient dielectric characteristics of gaseous nitrogen to develop a transmission superconducting apparatus. Dielectric experiments for a solid insulating barrier made of glass fiber-reinforced plastics (GFRP) in gaseous nitrogen are conducted under various pressures (0.1 ∼ 0.4 MPa), and the results are analyzed. A solid insulating barrier is installed between a rod to plane electrode system. The AC electrical breakdown characteristics according to the pressure of gaseous nitrogen and the position of a barrier between two electrodes are observed.

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References

  1. Kang, H., Lee, C., Nam, K., Yoon, Y.S., Chang, H.-M., Ko, T.K., Seok, B.-Y.: Development of a 13.2 kV/630 A (8.3 MVA) high temperature superconducting fault current limiter. IEEE Trans. Appl. Supercond. 18(2), 628–631 (2008)

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Acknowledgments

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by Korea government Ministry of Trade, Industry and Energy (No. 20131020401020)

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Authors and Affiliations

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

    Hongseok Lee, Jong O Kang, Yeong Ho Jeong & Hyoungku Kang

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  1. Hongseok Lee
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  2. Jong O Kang
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  3. Yeong Ho Jeong
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  4. Hyoungku Kang
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Correspondence to Hyoungku Kang.

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Lee, H., Kang, J.O., Jeong, Y.H. et al. Experimental Study on Barrier Effects in Gaseous Nitrogen for the Development of a High-Voltage Superconducting Apparatus. J Supercond Nov Magn 28, 601–605 (2015). https://doi.org/10.1007/s10948-014-2808-5

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  • DOI: https://doi.org/10.1007/s10948-014-2808-5

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