Effect of Dynamic Resistance on AC loss in Stacked superconducting tapes

Liu, Rujing; Yang, Wenjiang; Song, Dongbin; Zhu, Jiahui; Li, Xiaodong

doi:10.1109/tasc.2020.2966457

Cited by 9 publications

(15 citation statements)

References 16 publications

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“…The difference becomes smaller towards higher magnetic amplitudes. We attribute the difference to shielding current effect in the stack [25][26][27] .…”

Section: Non-zero DC Currentmentioning

confidence: 98%

“…Many previous works have reported separate studies of magnetization loss [16][17][18][19][20][21][22][23][24] (under an AC magnetic field only) or dynamic resistance/loss [25][26][27][28] for HTS coated conductor single tape or stacks. These studies are incomplete to reveal the whole picture of dynamic resistance and total loss characteristics on account of the complex interaction between the DC current and the AC magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic resistance and total loss in a three-tape REBCO stack carrying DC currents in perpendicular AC magnetic fields at 77 K

Sun¹,

Fang²,

Sidorov³

et al. 2022

Supercond. Sci. Technol.

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In many high-temperature superconducting (HTS) applications, HTS coated conductors carry a DC current under an external AC magnetic field. In such operating conditions, dynamic resistance will occur when the traversing magnetic flux across the HTS conductors. Consequently, AC loss within the superconductors is composed of the dynamic loss component arising from dynamic resistance and the magnetization loss component due to the AC external magnetic field. In this work, the dynamic resistance and the total loss in a three-tape HTS coated conductor stack were measured at 77 K under perpendicular AC magnetic fields up to 80 mT and DC currents (Idc) up to the critical current (Ic). The stack was assembled from three serial-connected 4 mm wide Superpower wires. The measured dynamic resistance results for the stack were well supported by the results from 2D H-formulation finite element modelling (FEM) and broadly agree with the analytical values for stacks. The FEM analysis shows asymmetric transport DC current profiles in the central region of the superconductor. We attribute the result to the superposition of DC currents and the induced subcritical currents which explains why the measured magnetization loss values increase with DC current levels at low magnetic field. The onset of dynamic loss for the stack for low i (Idc/ Ic) values is much slower when compared to that of the single tape and hence the contribution of the dynamic loss component to the total loss in the stack is much smaller than that of the single tape. Dynamic loss in the stack becomes comparable to the magnetization loss at i = 0.5 and becomes greater than the magnetization loss at i = 0.7. Both magnetization loss and dynamic loss in the stack are smaller than those of the single tape due to shielding effects.

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“…The difference becomes smaller towards higher magnetic amplitudes. We attribute the difference to shielding current effect in the stack [25][26][27] .…”

Section: Non-zero DC Currentmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Dynamic resistance and total loss in a three-tape REBCO stack carrying DC currents in perpendicular AC magnetic fields at 77 K

Sun¹,

Fang²,

Sidorov³

et al. 2022

Supercond. Sci. Technol.

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show abstract

“…Dynamic resistance for single or stacked tapes, as a key feature of HTS flux pump devices, have been studied by both analytical expressions [4,[9][10][11][12][13] and numerical models [14,15], which have been proven to be in good agreement with experimental results. Zhang et al has tried to calculate AC loss of HTS coils including dynamic loss [16].…”

Section: Introductionmentioning

confidence: 99%

Behaviour prediction of closed-loop HTS coils in non-uniform AC fields

Zhong

Wang

et al. 2021

Supercond. Sci. Technol.

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Field decay rate is the key characteristic of superconducting magnets based on closed-loop coils. However, in Maglev trains or rotating machines, closed-loop magnets work in external AC fields and will exhibit an evidently accelerated field decay resulting from dynamic resistances, which are usually much larger than joint resistance. Nevertheless, there has not been a numerical model capable of systematically studying this behaviour, which is the main topic of this work. The field decay curves of a closed-loop high-temperature-superconducting (HTS) coil in various AC fields are simulated based on H-formulation. A non-uniform external field generated by armature coils is considered. Reasonable consistence is found between experimental and simulation results. In our numerical model, the impact of current relaxation, which is a historical challenge, is analysed and subsequently eliminated with acceptable precision. Our simulation results suggest that most proportion of the field decay rate is from the innermost and outermost turns. Based on this observation, a magnetic shielding pattern is designed to reduce the field decay rate efficiently. This work has provided magnet designers with an effective method to predict the field decay rate of closed-loop HTS coils in external AC fields, and explore various shielding designs.

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“…Simulations based on 2D H-formulation have studied the dynamic resistance/loss and total loss of single REBCO coated conductors and stacks [16], [17], [21]. In addition, the derived analytical equations developed for dynamic resistance of single REBCO coated conductors or stacks carrying DC currents under perpendicular magnetic fields had good agreement with both finiteelement model (FEM) simulation and experimental results [17], [23].…”

Section: Introductionmentioning

confidence: 75%

“…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%

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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Effect of Dynamic Resistance on AC loss in Stacked superconducting tapes

Cited by 9 publications

References 16 publications

Dynamic resistance and total loss in a three-tape REBCO stack carrying DC currents in perpendicular AC magnetic fields at 77 K

Dynamic resistance and total loss in a three-tape REBCO stack carrying DC currents in perpendicular AC magnetic fields at 77 K

Behaviour prediction of closed-loop HTS coils in non-uniform AC fields

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

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