Earticle

초록

영어

This paper presents the analysis and experiment results on the electrical and thermal characteristics of metal insulation (MI) REBCO racetrack coil, which was wound with stainless steel (SS) tape between turn–to–turn layers, under rotating magnetic field and conduction cooling system. Although the field windings of superconducting rotating machine are designed to operate on a direct current, they may be subjected to external magnetic field due to the unsynchronized armature windings during electrical or mechanical load fluctuations. The field windings show the voltage and magnetic field fluctuations and the critical current reduction when they are exposed to an external magnetic field. Moreover, the cryogenic cooling conditions are also identified as the factors that affect the electrical and thermal characteristics of the HTS coil because the characteristic resistance changes according to the cryogenic cooling conditions. Therefore, it is necessary to investigate the effect of external magnetic field on the electrical and thermal characteristics of MI–SS racetrack coil for further development reliable HTS field windings of superconducting rotating machine. First, the major components of the experiment test (i.e., HTS racetrack coil construction, armature winding of 75 kW class induction motor, and conduction cooling system) were fabricated and assembled. Then, the MI racetrack coil was performed under liquid nitrogen bath and conduction cooling conditions to estimate the key parameters (i.e., critical current, time constant, and characteristic resistance) for the test coil in the steady state operation. Further, the test coil was charged to the target value under conduction cooling of 35 K then exposed to the rotating magnetic field, which was generated by three phrase armature windings of 75 kW class induction motor, to investigate the electrical and thermal characteristics during the transient state.

목차

Abstract
1. INTRODUCTION
2. EXPERIMENTAL SETUP
2.1. Fabrication of MI-SS racetrack coil
2.2. Fabrication of conduction cooling system integrated MI–SS racetrack coil
3. RESULTS AND DISCUSSION
3.1. Cooling and vacuum test
3.2. Current-voltage test
3.2. Charging and discharging test
3.3. Characteristic tests under various AC rotating magnetic field
4. CONCLUSIONS
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Yoon Seok Chae [ Department of Electrical Engineering, Jeju National University, Jeju, Korea ]
• Ji Hyung Kim [ Department of Electrical Engineering, Jeju National University, Jeju, Korea ]
• Huu Luong Quach [ Department of Electrical Engineering, Jeju National University, Jeju, Korea ]
• Sung Hoon Lee [ Department of Electrical Engineering, Jeju National University, Jeju, Korea ]
• Ho Min Kim [ Department of Electrical Engineering, Jeju National University, Jeju, Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537