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DC V-I Characteristics of a High Temperature Superconductor for a 600 kJ Superconducting Magnetic Energy Storage Device in an Oblique External Magnetic Field

경사 외부자장에 대한 600 kJ급 SMES용 HTS도체의 DC V-I 특성

  • 이주영 (전남대학교 공과대학 전기공학과) ;
  • 마용호 (전남대학교 공과대학 전기공학과) ;
  • 류경우 (전남대학교 공과대학 전기공학과) ;
  • 최세용 ;
  • 김해종 (한국전기연구원 초전도응용연구사업팀)
  • Published : 2008.01.01

Abstract

We are developing a small-sized high temperature superconducting magnetic energy storage (HTS-SMES) magnet with the nominal storage capacity of 600 kJ, which provides electric power with high quality to sensitive electric loads. Critical current and N-value of a high temperature superconductor with large current, which was selected for the development of the 600 kJ HTS-SMES magnet, were investigated in various oblique external magnetic fields. Based on the critical current and N-value measured for the short sample conductor, we discussed the DC V - I characteristic of a model coil fabricated with the same conductor of 500 m. The results show that the measured critical current and N-value of the conductor for parallel field are constant in external magnetic fields less than about 0.2 T. However, for oblique fields, its critical current and N -value abruptly decrease in all external magnetic fields. Moreover, the measured critical current of the model coil well agrees with the numerically calculated one based on the DC V - I characteristic measured for the short sample conductor. This suggest that losses and critical currents for an HTS-SMES magnet made up of a high temperature superconductor with anisotropic characteristic are predictable from the data of a short sample conductor.

Keywords

DC voltage-current characteristics;HTS-SMES;Large current HTS-conductor;Oblique magnetic field;Model coil

References

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Cited by

  1. A Study on Numerical Analysis of the AC Loss in a Single-layer Superconducting Cable Sample vol.22, pp.7, 2009, https://doi.org/10.4313/JKEM.2009.22.7.606