Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Development and Test results of the Dielectric Evaluation System for a Helium Gas Cooled HTS Cable

헬륨가스 냉각 고온초전도 케이블의 절연특성 평가 시스템 개발 및 성능평가

  • 곽동순 (경일대학교 소방방재학부) ;
  • Received : 2012.02.10
  • Accepted : 2012.02.28
  • Published : 2012.03.31
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Abstract

The novel type of cable under consideration is cooled by gaseous Helium at elevated pressure. Helium is known for having poor electric breakdown strength; therefore the dielectric capabilities of this type of cable must be tested under conditions similar to the envisaged operation. In order to study the dielectric performance we have designed and built a novel high pressure cryostat rated at 2.17 MPa which has been used for testing model cables of lengths of up to 1 m. The cryostat is an open system where the gas is not re-circulated. This allows maintaining a high purity of the gas. The target temperature range is between 40 K and 70 K. This substantially increases the critical current density of the HTS compared to 77 K, which is the typical temperature of cables cooled by liquid nitrogen. The cryostat presented allows for adjusting the temperature and keeping it constant for the time necessary to run a complete dielectric characterization test. We give a detailed description of the cryostat. Measurements of partial discharge inception voltages as well as the temperature distribution along the model cables as a function of time are presented.

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References

  1. T. J. Haugan et al., "Design of Compact, Lightweight Power Transmission Devices for Specialized High Power Applications", SAE Int. J. Aerosp. 1(1), pp. 1088-1094, 2008. https://doi.org/10.4271/2008-01-2930
  2. 조전욱, "22.9kV 50MVA 초전도 케이블 시스템 개발 및 향후전망", 한국초전도․저온공학회, 9권, 2호, pp. 6-9, 2007.
  3. B. K. Fitzpatrick et al., "Characterization of Gaseous Helium Flow Cryogen in a Flexible Cryostat for Naval Applications of High Temperature Superconductors", IEEE Trans. on Appl. Supercond., vol. 17, no. 2, pp. 1752-1755, 2007. https://doi.org/10.1109/TASC.2007.897763
  4. J. T. Kephart et al., "High Temperature Superconducting Degaussing From Feasibility Study to Fleet Adoption", IEEE Trans. on Appl. Supercond., vol. 21, no. 3(2), pp. 2229-2232, 2011. https://doi.org/10.1109/TASC.2010.2092746
  5. R. J. Meats, "Pressurized-helium breakdown at very low temperature", IEEE Proceedings of the Institution of Electrical Engineers, IEEE 1972, vol. 119, no. 6, 760-765, 1972. https://doi.org/10.1049/piee.1972.0158
  6. F. Schauer, "A capacitance-graded cryogenic high voltage bushing for vertical or horizontal mounting", Cryogenics, vol. 24, Issue 2, pp. 90-96, 1984. https://doi.org/10.1016/0011-2275(84)90068-7
  7. 곽동순, 천현권, 최재형, 김해종, 조전욱, 김상현, "154 kV급 고온초전도 케이블 및 단말의 전기절연 설계", 한국초전도․저온공학회, 9권, 1호, pp. 61-66, 2007.