Fast Distributed Simulation of “Defect-Irrelevant” Behaviors of No-Insulation HTS Coil

An, Seong Jin; Im, Chaemin; Bang, Jeseok; Kim, Jaemin; Bong, Uijong; Lee, Jung Tae; Kim, Geonyoung; Han, Ki Jin; Hahn, Seungyong

doi:10.1109/tasc.2021.3066197

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…In the literature, different approaches are proposed to investigate the behavior of NI coils, mainly based on equivalent distributed [12]- [14], [31]- [33] or lumped [34]- [39] parameter circuit models. In this work, the NI pancake-wound coil is characterized using the simple equivalent lumped parameter circuit shown in Fig.…”

Section: Equivalent Circuitmentioning

confidence: 99%

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

Musso

Bang

Bong

et al. 2022

IEEE Trans. Appl. Supercond.

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One of the technical issues in the application of High Temperature Superconducting (HTS) tapes to magnet technology is the need to wind long tape sections with uniform electric properties along the length. It has been reported that a No-Insulation (NI) coil can properly work even in the presence of defective super-conductive regions, with a minimal drop of performance as com-pared to its "defect-free" counterpart. This could open up the possibility of manufacturing coils by jointing together several tape segments of limited length, lowering the conductor cost. In this work, a single pancake NI HTS coil is wound using several tape segments cut from the same lot, jointed together. The electrical resistance of each joint is set independently, realizing either high or low resistance joints. Thus, the coil is designed to include multiple defective sections at specific locations. The coil is refrigerated by conduction-cooling, and tested at different temperatures and charging rates. The coil instrumentation allows measuring the voltage over the whole winding, as well as the magnetic field in the central bore. The measurements are used to study the defect-irrelevant behavior of the coil. A simple equivalent lumped parameter circuit is applied to derive the coil effective parameters and analyze its electromagnetic behaviour.

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Section: Equivalent Circuitmentioning

confidence: 99%

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

Musso

Bang

Bong

et al. 2022

IEEE Trans. Appl. Supercond.

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“…By combining the previously suggested lumped parameter circuit model and distributed parameter circuit model, we constructed an equivalent circuit model consisting of five elements, as shown in figure 8. Considering that a single local defect affects current distribution over adjacent turns where it located [36], the second and fourth elements of the circuit represent the 75-76th turn and 83-84th turns of the coil containing defects #1 and #2, respectively, while the other elements are turns of radially inside defect #1 (the first element), between defect #1 and #2 (the third element), and outside defect #2 (the fifth element). The number of turns of each element was set based on the location of the defects (x).…”

Section: Effect Of 'Defect' On Coil Performance Analyzed By Equivalen...mentioning

confidence: 99%

‘Defect-irrelevant-winding’ no-insulation (RE)Ba₂Cu₃O_7 − x pancake coil in conduction-cooling operation

Bong

Kim

Bang

et al. 2021

Supercond. Sci. Technol.

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This paper reports experiment and simulation results of a ‘defect-irrelevant-winding (DIW)’ no-insulation (NI) (RE)Ba2Cu3O7 − x pancake coil operated in a conduction-cooling environment at temperatures lower than 77 K. The key idea of the DIW high-temperature superconductor (HTS) winding technique, firstly proposed in 2016, is to wind an NI pancake coil with HTS tapes, on purpose, containing multiple ‘defects.’ Using the defect (flawed) HTS tapes, we expect to significantly lower the construction cost of a DIW HTS magnet in marginal sacrifice of the magnet performance. In this study, charging tests of a DIW coil were performed in a conduction cooling system by controlling the temperature of the second stage in a range of 20–65 K, to determine the maximum operable current that avoids thermal runaway of the test coil at a given temperature. Coil terminal voltages, center fields, local temperatures, and power supply currents were carefully monitored during the tests, and the trend for each parameter was obtained. Also, by use of an equivalent circuit model, the test results were numerically analyzed to evaluate the effect of local defects on the overall performance of the test coil in order to validate the feasibility of the DIW HTS coil in operation under the conduction-cooling environment at temperatures lower than 77 K.

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“…For instance, quench detection, magnet diagnostics, and instrumentation techniques [2][3][4][5][6][7][8][9][10][11][12][13][14] have been considerably studied to investigate NI REBCO magnet quench. As a result, various quench simulation models [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] have been proposed, and it has been demonstrated that they are practicable in replicating quench voltage and the corresponding current distribution to some degree. However, these simulations still struggle to reproduce module coil voltages during quench in high magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil

Bang,

Bradford,

Lee

et al. 2024

Supercond. Sci. Technol.

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This paper reports the magnetic field and winding force-dependent contact resistance, also known as characteristic resistance, of no-insulation (NI) REBCO coil. Three NI coils were wound with different winding forces (<1 kgf, 3 kgf, and 5 kgf) using the same REBCO-coated conductor, and they were tested at 4.2 K in a background field of 0, 5, 10, and 14 T. The contact resistance of each coil is measured at each field. As a result of the measurements, we draw two conclusions. First, a quadratic function for magnetic field intensity reasonably reproduces the measurement results of each NI test coil's magnetic field-dependent contact resistance, where the practical fit function's coefficients are determined depending on the winding force. Second, the contact resistance of each coil is partially inconsistent with the magnetoresistance of the electroplated material, i.e., copper, of the REBCO-coated conductor. This paper will present the measurement results in detail, discuss them with Kohler's rule, and formulate the contact resistance using winding force and magnetic field terms.

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Fast Distributed Simulation of “Defect-Irrelevant” Behaviors of No-Insulation HTS Coil

Cited by 8 publications

References 35 publications

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

‘Defect-irrelevant-winding’ no-insulation (RE)Ba₂Cu₃O_7 − x pancake coil in conduction-cooling operation

An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil

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Fast Distributed Simulation of “Defect-Irrelevant” Behaviors of No-Insulation HTS Coil

Cited by 8 publications

References 35 publications

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

Analysis of a No-Insulation HTS Pancake Coil Including Multiple Resistive Joints

‘Defect-irrelevant-winding’ no-insulation (RE)Ba2Cu3O7 − x pancake coil in conduction-cooling operation

An experimental study to investigate magnetic field and winding force-dependent contact resistance of NI REBCO coil

Contact Info

Product

Resources

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‘Defect-irrelevant-winding’ no-insulation (RE)Ba₂Cu₃O_7 − x pancake coil in conduction-cooling operation