Improved Calculation of Magnetic Hysteresis Loss of Stacked Superconducting Cable Under <i>T-A</i> Formulation

Hong, Wenzhe; Liu, Huajun; Liu, Fang; Jin, Huan; Shi, Yi

doi:10.1109/tasc.2022.3161859

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…3D FEM models were built to simulate the magnetization loss, dynamic resistance/loss, and total loss in the spiral tape and three CORC cables, as shown in Fig. 1, based on T −A formulation [35], [36], [37] using COMSOL 5.6. To reduce the computation time, only one full twist pitch length of the four models is considered based on their periodic structures.…”

Section: Numerical Modelling a T-a Formulationmentioning

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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Section: Numerical Modelling a T-a Formulationmentioning

confidence: 99%

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

et al. 2023

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“…These devices must ensure the long-term stable operation of superconductors, where the heat generated by AC losses is an important design factor. The AC loss characteristics of various HTS cables [4][5][6] have been extensively studied, such as conductor on round core (CORC) [7][8][9][10][11][12], twisted stacked tape cable [13,14], Roebel cable (Roebel) [15][16][17], and quasiisotropic superconducting cables [18,19].…”

Section: Introductionmentioning

confidence: 99%

Effect of winding methods: transport AC losses in CORC coils

Zhao

Gao²,

Wu³

et al. 2022

Supercond. Sci. Technol.

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AC losses undoubtedly increase the burden on the cooling system and affect the overall performance of HTS cables. Therefore, AC losses in HTS cables are important design factors for large-scale HTS equipments. Extensive research has been conducted on straight, densely wound conductors. However, AC losses of bending/circular conductors have not been sufficiently studied. In this article, the transport AC losses in a circular HTS conductor coil bended by a conductor on round core (CORC) type cable were investigated using experiments and numerical simulations. The effect of different winding methods was also studied. First, the modeling method of the three-dimensional simulation and the experimental procedures were presented. The simulation results of the straight densely wound conductor (SDWC) and circular densely wound coil (CDWC) were compared with the corresponding experimental results. Finally, the winding method for the CDWC was optimized using both the simulation and experimental approaches. Both the experiments and simulations showed that reducing the tape-to-tape frontal area was able to decrease the transport AC loss, and the results show that the optimum winding angle of the HTS CORC coil was 24.15°. Overall, the modeling and experiments provide useful optimization strategies for designing winding structures of high-performance CORC coils/magnets.

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“…The existing cables made of REBCO tape include the following four structures: Roebel assembled coated conductor cables [12,13], twisted-stack slotted core cables [14,15], twisted stacked-tape cables [16][17][18][19] and conductor on round core (CORC ® ) cables and wires [20]. The CORC ® cable contains HTS tapes wound around a core, has a simple production process, strong current carrying capacity, and low AC loss.…”

Section: Introductionmentioning

confidence: 99%

Prediction of strain, inter-layer interaction and critical current in CORC^® wires under axial strain by T-A modeling

Wang

Gao

Anvar

et al. 2022

Supercond. Sci. Technol.

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Superconducting Conductor on Round Core (CORC®) cables and wires can meet the needs of large high-field magnets, such as particle accelerator and compact nuclear fusion machines, due to their simple cabling process, high current-carrying capacity and reliable operation under high mechanical stresses. Many high-field magnets require CORC® cables to carry a current of thousands of amperes in a background magnetic field exceeding 20 T. As a result, the large electromagnetic forces will deform the cable in the axial direction due to hoop stress and in the transverse direction by compressive stress. Therefore, it is essential to determine the irreversible deformation limit of the CORC® cable under axial tensile load and optimize the cabling parameters to potentially extend this limit. Analytical and numerical methods are developed to assess the performance degradation of CORC® wires under axial tensile load. The strain level, interlayer interaction and their impact on the critical current are calculated by combining the mechanical response and the T-A method. Analyzing the results shows that the winding angle of the tape and the Poisson's ratio of the inner core are key factors affecting the irreversible tensile strain limit of CORC® wires. The smaller the winding angle and the higher the Poisson's ratio of the inner core, the higher the irreversible tensile strain limit. For multi-layer CORC® wires, the initial contact pressure caused by the cabling process must also be considered. The inter-layer interaction is coupled with the tape strain of each layer. The results of this research can serve as a basis for optimizing and designing CORC® wires with extended irreversible strain limits.

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Improved Calculation of Magnetic Hysteresis Loss of Stacked Superconducting Cable Under T-A Formulation

Cited by 8 publications

References 13 publications

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Effect of winding methods: transport AC losses in CORC coils

Prediction of strain, inter-layer interaction and critical current in CORC^® wires under axial strain by T-A modeling

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Improved Calculation of Magnetic Hysteresis Loss of Stacked Superconducting Cable Under T-A Formulation

Cited by 8 publications

References 13 publications

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Simulation of Dynamic Resistance and Total Loss of HTS CORC Cables

Effect of winding methods: transport AC losses in CORC coils

Prediction of strain, inter-layer interaction and critical current in CORC® wires under axial strain by T-A modeling

Contact Info

Product

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About

Prediction of strain, inter-layer interaction and critical current in CORC^® wires under axial strain by T-A modeling