Numerical Study on Dynamic Resistance of an HTS Switch Made of Series-Connected YBCO Stacks

Hu, Jintao; Ma, Jun; Yang, Jiabin; Tian, Mengyuan; Shah, Adil; Patel, Ismail; Wei, Haigening; Hao, Luning; Öztürk, Yavuz; Shen, Boyang; Coombs, Tim

doi:10.1109/tasc.2021.3062258

Cited by 17 publications

(10 citation statements)

References 34 publications

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“…85 mT from Fig. 11), the central region is no longer shielded such that J J c (B) > 1, except for a very thin current-reversal region [22]. In this case, a net flow of magnetic flux traverses the DC current-flowing region, leading to the occurrence of dynamic resistance/loss.…”

Section: Figure 10 Dynamic Resistance Comparison Between the Inner La...mentioning

confidence: 98%

“…To date, many previous works on dynamic resistance and total loss have mainly focused on single HTS coated conductor tapes [12], [13], [14], [15], [16], [17] or stacks [3], [18], [19], [20], [21], [22], [23]. In terms of the operating conditions, the dependence of dynamic resistance and total loss of single REBCO coated conductors on magnetic field/DC current/temperature/frequency have been investigated through experiments [13], [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

et al. 2023

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In some high temperature superconducting (HTS) applications, HTS coated conductors carry DC current under external AC magnetic fields. Dynamic resistance occurs when the amplitude of the magnetic field is greater than the threshold magnetic field of the coated conductors. The resulting AC loss, termed as total loss, consists of dynamic loss due to dynamic resistance and magnetization loss due to the shielding currents caused by the AC magnetic field. Conductor on round core (CORC) cables wound with HTS coated conductors have attracted broad attention due to their large current-carrying capability and mechanical flexibility for coil applications. However, there has been no report on dynamic resistance and total loss in CORC cables. In this work, we present 3D FEM simulation results on the dynamic resistance and total loss of a spiral tape and three CORC cables, based on the T −A formulation. The number of layers of the CORC cables, the amplitude of the AC magnetic field and transport DC current levels have been varied to study the impact of those parameters on dynamic resistance and total loss of the three CORC cables. The simulation results show that magnetization loss without current in a spiral tape can be analytically estimated by Brandt and Indenbom's theoretical equation for a superconducting strip under perpendicular AC magnetic field with a geometric coefficient 2/π. Furthermore, dynamic resistance of the spiral tape and each tape in a single-layer cable can be predicted by the analytical equation for a strip carrying DC current under perpendicular AC magnetic field, also taking into account the geometric coefficient 2/π. The simulation results also show that the difference of total loss values in the three CORC cables depends on the shielding effect: the more layers of CORC cables, the lower each loss component. The two-layer Cable with each tape in the outer layer sitting on top of the tape in the inner layer has the lowest loss and the highest threshold magnetic field.

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Section: Figure 10 Dynamic Resistance Comparison Between the Inner La...mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

et al. 2023

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“…REBCO coated conductors (CCs) are becoming the preferred wire choice in many high-temperature superconducting (HTS) applications, such as field-triggered persistent current switches (PCSs) [1][2][3][4][5][6][7][8], flux pumps (FPs) [9][10][11][12], fault current limiters (FCLs) [13][14][15], electrodynamic suspension systems [16][17][18] and linear synchronous motors [19,20]. In these HTS applications, a REBCO CC carries DC currents under AC and DC magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Dynamic resistance and voltage response of a REBCO bifilar stack under perpendicular DC-biased AC magnetic fields

Sun

Geng

Badcock

et al. 2023

Supercond. Sci. Technol.

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Dynamic resistance of REBCO coated conductors (CCs) is a key parameter in many high-temperature superconductor applications where CCs carry DC currents exposed to AC and DC magnetic fields, such as field-triggered persistent current switches, flux pumps, and fault current limiters. In this work, dynamic resistance and dynamic voltage has been studied via experiments and FEM simulations in a REBCO bifilar stack at 77 K under combined AC and DC magnetic fields with different magnitudes, frequencies, and waveforms. Our results show some distinct features of dynamic resistance and voltage from those under pure AC magnetic fields. With increasing DC magnetic fields, dynamic resistance exhibits an obvious linearity with applied AC magnetic fields, and becomes less dependent on the AC field frequency. The fundamental frequency of the dynamic voltage under DC magnetic fields becomes the same with that of the applied AC fields, which completely differs from the pure AC field case where the fundamental frequency doubles. For the first time, instantaneous threshold field (Bth) values are obtained from the dynamic voltage, which are substantically different in the field-increasing and field-decreasing process. These key differences are attributed to the dominant role of DC magnetic fields in determining the critical current of the superconductor, which significantly dwarfs the influence of AC fields. These new discoveries may help researchers better understand the electromagnetism of the superconductor and be useful for relevant applications.

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“…The superconducting dynamic voltage/resistance has been analytically studied [10][11][12], and can also be investigated by experiments [14][15][16], and modellings [17][18][19]. However, previous studies only used the sinusoidal signal (or mono-type AC signal) as the waveform of the AC magnetic field, but the systematic investigation of dynamic voltage/resistance using other types of oscillating AC fields is still missing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of the Dynamic Voltage in HTS Materials under the Action of DC Transport Currents and Different Oscillating Magnetic Fields

Shen

Chen

et al. 2022

Materials

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The dynamic voltage is a unique phenomenon of superconducting materials. It arises when the superconductor is carrying a DC transport current and spontaneously in subject to an AC magnetic field. This study excavates the aspects that previous studies have not comprehensively investigated: the dynamic voltage in a DC-carrying superconducting tape exposed to different oscillating AC magnetic fields. First, the fundamental physics of dynamic voltage/flux of superconductors is reviewed and further analysed in detail. We used the superconducting modelling method using the H-formulation merged into the finite-element method (FEM) software, to re-produce the typical dynamic voltage behaviour of a superconducting tape. The modelling was verified by both the analytical and experimental results, in order to precisely prove the reliability of the modelling. Afterwards, the modelling was performed for a DC-carrying superconducting tape under four different oscillating magnetic fields (sine, triangle, sawtooth and square), and their corresponding dynamic voltages and energy losses were analysed and compared. Results show the sinusoidal magnetic field can lead to the optimal combination of reasonable dynamic voltage but relatively lower loss, which is suitable for those superconducting applications requiring dynamic voltage as the energy source, e.g., flux pumps. This article presents novel investigation and analysis of the dynamic voltage in superconducting materials, and both the methodology and results can provide useful information for the future design/analysis of superconducting applications with DC transport currents and AC magnetic fields.

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Numerical Study on Dynamic Resistance of an HTS Switch Made of Series-Connected YBCO Stacks

Cited by 17 publications

References 34 publications

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Dynamic resistance and voltage response of a REBCO bifilar stack under perpendicular DC-biased AC magnetic fields

Numerical Modelling of the Dynamic Voltage in HTS Materials under the Action of DC Transport Currents and Different Oscillating Magnetic Fields

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