Dynamic Resistance Measurement in a Four-Tape YBCO Stack With Various Applied Field Orientation

Liu, Yanchao; Jiang, Zhenan; Li, Quan; Bumby, Chris W.; Badcock, Rodney A.; Fang, Jin

doi:10.1109/tasc.2019.2900673

Cited by 20 publications

(30 citation statements)

References 30 publications

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“…This non-linearity can not be explained by (10). Actually, [12] mentioned that (5) provided good agreement with all previously-published experimental data only for a high load rate (especially for i > 10%). Mikitik and Brandt have proposed another expression for the threshold field [20], as…”

Section: B Influence Of I C0 On R Dynn (I T )supporting

confidence: 76%

Dependence of Dynamic Loss on Critical Current and n-Value of HTS Coated Conductors

Zhang

Yao

Jiang

et al. 2019

IEEE Trans. Appl. Supercond.

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Properties of superconductors, such as critical current and n-value, have a significant impact on their loss characteristics. This impact is essential for the design of superconducting devices and their loss reduction, and therefore need to be thoroughly understood. The dependence of AC loss in high temperature superconductors (HTS) on these properties has been well studied. However, it is still unknown how dynamic loss is affected. This paper is to address this unsolved problem and provide comprehensive analyses through both numerical simulation and experimental measurements. In this paper, HTS coated conductors with a wide range of critical currents and n-values have been extensively studied. Their dynamic losses and resistance under various conditions have been modelled and compared to available experiment measurements. Results clearly show the dependence of dynamic loss and resistance on critical current and n-value. The cases with high current load under strong external magnetic field have been studied as well. All these results show a rapid change of dynamic loss around certain magnetic fields, which we defined to be the "corner field", B cor. This paper clearly demonstrates the dependence of dynamic loss and resistance on critical current and n-value, which can be used as a reference for material selection and design optimization.

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Section: B Influence Of I C0 On R Dynn (I T )supporting

confidence: 76%

Dependence of Dynamic Loss on Critical Current and n-Value of HTS Coated Conductors

Zhang

Yao

Jiang

et al. 2019

IEEE Trans. Appl. Supercond.

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“…There is a lot of scattering of data when B m < 10 mT and at θ = 15°, the data deviate from the common curve. The results might be attributed to the experimental error due to the unstable background loss and the tilt of the crystal lattice of the superconductor layer [36]. The result implies the eddy current loss in the copper strips in the copper-superconductor stacks is approximately dominated by the perpendicular magnetic field component.…”

Section: Table II Effective Penetration Field At Various Field Anglesmentioning

confidence: 97%

Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Sun

Long

Sidorov

et al. 2021

IEEE Trans. Appl. Supercond.

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Ba 2 Cu 3 O 7-d (REBCO) coated conductors are becoming a preferred wire choice for many potential high temperature superconducting (HTS) applications, where additional metal layers are usually attached to the REBCO conductors to improve reliability and stability. In such cases, the eddy current loss in the metal layers is affected by the magnetic field shielding by adjacent REBCO coated conductors. Here we present the ac loss measurement and simulation results in three copper-superconductor stacks comprising a 10-mm-wide Fujikura-coated conductor with one, two, and four 0.1-mm-thick, 10-mm-wide copper strips, under various applied magnetic field angles (defined by the angle between the applied magnetic field and the wide face of the superconductor) from 15°to 90°at 77 K. The amplitude of the magnetic field is up to 100 mT. The shielding effect, which reduces the eddy current loss in the metal layers stacked with a superconductor layer, increases with decreasing field angles, due to the change of the effective penetration field at the different field angles. The eddy current loss in the copper strips in the copper-superconductor stacks under the magnetic fields with various orientations is dominated by the perpendicular magnetic field component.

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“…When the Jc(B) effect is considered, Jc under external magnetic field will be degraded and thus, the penetration field will decrease, accordingly. In this case study, we chose 20 mT as the external magnetic field, which is smaller than the penetration field calculated by self-field Jc [33]. Therefore, when constant Jc is considered in the calculation, magnetization loss would be underestimated.…”

Section: Effect Of N-value and B-dependency Of Critical Current Dementioning

confidence: 99%

Magnetization Loss in HTS Coated Conductor Exposed to Harmonic External Magnetic Fields for Superconducting Rotating Machine Applications

et al. 2021

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Previous studies on magnetization AC loss of high temperature superconducting (HTS) coated conductors (CCs) taken into account the ideally sinusoidal external magnetic field, or non-sinusoidal by considering only the harmonics in phase with the fundamental component. However, realistically magnetic field often contains harmonics with different phase angles and amplitudes. In this work, magnetization AC loss in HTS CC was studied, considering the phase angle φ of each harmonic; assuming superconductor is subjected to external magnetic field which is distorted by the 3 rd and the 5 th harmonics. Phase angle of each harmonic was considered in the range of 0 to 2π and amplitude of fundamental magnetic field, was assumed as 10, 20, 50, and 100 mT. Different distortion level of magnetic field was considered too. It is concluded that phase angle of field harmonic has a significant effect on magnetization loss of HTS CCs. INDEX TERMS External magnetic field, Harmonic phase angle, HTS coated conductor, Magnetization AC loss. Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

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Dynamic Resistance Measurement in a Four-Tape YBCO Stack With Various Applied Field Orientation

Cited by 20 publications

References 30 publications

Dependence of Dynamic Loss on Critical Current and n-Value of HTS Coated Conductors

Dependence of Dynamic Loss on Critical Current and n-Value of HTS Coated Conductors

Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Magnetization Loss in HTS Coated Conductor Exposed to Harmonic External Magnetic Fields for Superconducting Rotating Machine Applications

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Dynamic Resistance Measurement in a Four-Tape YBCO Stack With Various Applied Field Orientation

Cited by 20 publications

References 30 publications

Dependence of Dynamic Loss on Critical Current and n-Value of HTS Coated Conductors

Dependence of Dynamic Loss on Critical Current and n-Value of HTS Coated Conductors

Shielding Effect of (RE)Ba2Cu3O7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Magnetization Loss in HTS Coated Conductor Exposed to Harmonic External Magnetic Fields for Superconducting Rotating Machine Applications

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Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations