Browse > Article
http://dx.doi.org/10.9714/psac.2021.23.4.061

Analysis on electrical and thermal characteristics of MI-SS racetrack coil under conduction cooling and external magnetic field  

Chae, Yoon Seok (Department of Electrical Engineering, Jeju National University)
Kim, Ji Hyung (Department of Electrical Engineering, Jeju National University)
Quach, Huu Luong (Department of Electrical Engineering, Jeju National University)
Lee, Sung Hoon (Department of Electrical Engineering, Jeju National University)
Kim, Ho Min (Department of Electrical Engineering, Jeju National University)
Publication Information
Progress in Superconductivity and Cryogenics / v.23, no.4, 2021 , pp. 61-69 More about this Journal
Abstract
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.
Keywords
conduction cooling system; electrical and thermal characteristics; external magnetic field; HTS rotating machine; metal insulation HTS racetrack coil;
Citations & Related Records
연도 인용수 순위
  • Reference
1 T. S. Lee et al., "The effects of co-wound kapton, stainless steel and copper, in comparison with no insulation, on the time constant and stability of GdBCO pancake coils," Supercond. Sci. Technol., vol. 27, no. 6, May. 2014, Art. no. 065018.
2 D. G. Yang et al., "A study on electrical characteristics of multilayered metallic-insulation coils," IEEE Trans. Appl. Supercond., vol. 27, no. 4, Jun. 2017, Art. no. 7700206.
3 H. L. Quach and H. M. Kim, "A study on charging and electrical stability characteristics with no-insulation and metal insulation in form of racetrack type coils," Prog. Supercond. Cryog., vol. 22, no. 3, pp. 13-19, Sep. 2020.   DOI
4 H. L. Quach et al., "Effects of stainless steel thickness and winding tension on electrical and thermal characteristics of metal insulation racetrack coils for 10-MW-class HTS wind generator," Cryogenics, vol. 115, Apr. 2021, Art. no. 103256.
5 H. L. Quach et al., "Analytical and numerical simulation on charging behavior of no-insulation REBCO pancake coil," Prog. Supercond. Cryog., vol. 20, no. 4, pp. 16 - 19, Dec. 2018.   DOI
6 D. G. Yang, Y. H. Choi, Y. G. Kim, J. B. Song, and H. G. Lee, "Analytical and experimental investigation of electrical characteristics of a metallic insulation GdBCO coil," Rev. Sci. Instrum., vol. 87, no. 3, Feb. 2016.
7 S. Hahn, D. K. Park, J. Bascunan, and Y. Iwasa, "HTS pancake coils without turn-to-turn insulation," IEEE Trans. Appl. Supercond., vol. 21, no. 3, pp. 1592-1595, Jun. 2011, Art. no. 1592.   DOI
8 Y-G Kim et al., "Numerical analysis on bifurcated current flow in no-insulation magnet," IEEE Trans. Appl. Supercond., vol. 24, no. 3, Jun. 2014, Art. no. 4900404.
9 H. L. Quach, "Analysis on electrical and thermal characteristics of a no-insulation HTS coil considering heat generation in steady and transient states," IEEE Trans. Appl. Supercond., vol. 29, no. 5, Aug. 2019, Art. no. 4701506.
10 S. Noguchi et al., "Numerical investigation of metal insulation technique on turn-to-turn contact resistance of REBCO pancake coils," IEEE Trans. Appl. Supercond., vol. 27, no. 4, Jun. 2017, Art. no. 7700505.
11 Y. S. Chae et al., "Design and analysis of HTS rotor-field coils of a 10-MW-class HTS generator considering various electric insulation techniques," IEEE Trans. Appl. Supercond., vol. 30, no. 4, Jun. 2020, Art. no. 4601707.
12 M-H Sohn et al., "Controllability of the contact resistance of 2G HTS coil with metal insulation," IEEE Trans. Appl. Supercond., vol. 28, no. 3, Apr. 2018, Art. no. 4602705.
13 X. Wang et al., "Turn-to-turn contact characteristics for an equivalent circuit model of no-insulation ReBCO pancake coil," Supercond. Sci. Technol., vol. 26, no. 3, Jan. 2013, Art. no. 035012.
14 J. Pelegrin et al., "Numerical and experimental analysis of normal zone propagation on 2G HTS wires," IEEE Trans. Appl. Supercond., vol. 21, no. 3, June. 2011, Art. no. 3041.
15 G. Iannone et al., "Quench propagation in commercial REBCO composite tapes," Cryogenics, vol. 109, Jul. 2020, Art. no. 103116.
16 S. Choi, H. C. Jo, Y. J. Hwang, S. Hahn, and T. K. Ko, "A study on the no insulation winding method of the HTS coil," IEEE Trans. Appl. Supercond., vol. 22, no. 3, Jun. 2012, Art. no. 4904004.
17 T. Wang, "Analyses of transient behaviors of no-insulation REBCO pancake coils during sudden discharging and overcurrent," IEEE Trans. Appl. Supercond., vol. 25, no. 3, Jun. 2015, Art. no. 4603409.