Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Increased impedance by quench at a shield layer of HTS power cable for fault current limiting function

  • Choi, Youngjun (Department of Mechanical Engineering, Changwon National University) ;
  • Kim, Dongmin (Department of Mechanical Engineering, Changwon National University) ;
  • Cho, Jeonwook (Korea Electrotechnology Research Institute) ;
  • Sim, Kideok (SuperGenics) ;
  • Kim, Sungkyu (Korea Electrotechnology Research Institute) ;
  • Kim, Seokho (Department of Mechanical Engineering, Changwon National University)
  • Received : 2019.11.22
  • Accepted : 2019.12.18
  • Published : 2019.12.31
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Abstract

To reduce the fault current below the current capacity of a circuit breaker, researches on HTS (High Temperature Superconductor) power cables with fault current limiting (FCL) function are increasing. An FCL HTS power cable transports current with low a impedance during normal operation. Yet, it limits the fault current by an increased inductive or resistive impedance of conducting layer when quench occurs at the FCL HTS power cable by the large fault current. An inductive type FCL HTS power cable uses increased inductive impendence caused by leakage magnetic flux outside the cable core when the quench occurs at a shield layer losing the magnetic shielding effect. Therefore, it has an advantage of less resistive heating than resistive type FCL HTS power cable and temperature increase is suppressed. This paper describes an ideal circuit model for the FCL HTS power cable to investigate the effectiveness of increased inductive impedance when quench occurs at the shield layer. Then, FEM analysis is presented with a simplified model cable composed of various iron yokes to investigate the effect of the shape of yoke on the generation of the inductive impedance.

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References

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