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Dielectric Characteristics of Liquid Nitrogen According to the Electrode Material

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Abstract

High-voltage superconducting apparatuses, such as superconducting fault current limiters, superconducting transformers, and superconducting cables, are operated in high voltage, cryogenic conditions. A superconducting coil system may breakdown electrically not only in quench state but also in normal state (Kang et al. IEEE Trans. Appl. Supercond., 17, 1493–1496, 2007). In this paper, dielectric experiments of liquid nitrogen according to electrode material are performed with AC and lightning impulse voltages to design an electrically reliable, high voltage superconducting system. The electrical breakdown voltage of liquid nitrogen for various pressures (from 0.1 MPa to 0.4 MPa) strongly depended on the electrode material. Therefore, the design of a high-voltage superconducting apparatus should consider the kind of electrode material. The experimental results in this study can be used to design the different parts of a high-voltage superconducting apparatus according to the electrode material.

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References

  1. Kang, H., Lee, C., Yang, S.E., Ko, T.K., Seok, B.Y.: Dielectric tests of superconducting coils for development of high voltage superconducting machines. IEEE Trans. Appl. Supercond. 17, 1493–1496 (2007)

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  2. Nam, K., Kang, H., Lee, C., Ko, T.K., Seok, B.-Y.: Visualization study on boiling of nitrogen during quench for fault current limiter applications. IEEE Trans. Appl. Supercond. 16, 727–730 (2006)

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Acknowledgments

The research was supported by a grant from the Academic Research Program of Korea National University of Transportation in 2014.

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Authors and Affiliations

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

    Jong O Kang, Hongseok Lee & Hyoungku Kang

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  1. Jong O Kang
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  2. Hongseok Lee
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  3. Hyoungku Kang
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Kang, J.O., Lee, H. & Kang, H. Dielectric Characteristics of Liquid Nitrogen According to the Electrode Material. J Supercond Nov Magn 28, 1167–1173 (2015). https://doi.org/10.1007/s10948-014-2677-y

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  • DOI: https://doi.org/10.1007/s10948-014-2677-y

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