Frequency-dependent critical current and transport ac loss of superconductor strip and Roebel cable

Thakur, K.P.; Raj, Ashish; Brandt, Ernst Helmut; Kvitkovič, J.; Pamidi, Sastry

doi:10.1088/0953-2048/24/6/065024

Cited by 78 publications

(56 citation statements)

References 34 publications

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“…The current capacity of high-temperature superconductors is due to the flux pinning [15]. As explained in [7] and [14], the increase of AC current capacity with increasing f is due to the thermally activated creep of vortices. The relaxation of flux creep may be the reason.…”

Section: B Frequency Dependence Of I-v Characteristics Under Self-fieldmentioning

confidence: 94%

“…It is the crossover point between the DC I c plot and the intersection point of the hysteretic and resistive curves. n a is equal to the n value at DC condition in [7]. In order to distinguish the difference between DC and AC condition, we define it as n a .…”

Section: B Frequency Dependence Of I-v Characteristics Under Self-fieldmentioning

confidence: 99%

“…However, most applications of superconductor are operating at alternating current. Moreover, the AC current-carrying capability of superconductor has attracted extensive attention [1]- [7]. The transport AC current capacity is different from DC conditions since flux penetrated in and out of HTS with changing rate of magnetic field.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it was found that the maximum AC current capacity of Bi2223/Ag was 0.707 I c at operating frequency of 50 Hz [6]. Based on 2-D finite element method simulation, Thakur that the critical current of the superconductor increases with frequency as f 1/n , where n is the exponent of the power law flux creep model [7]. However, this relation has not yet been verified by experiments.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling and Experimental Analysis of AC Critical Current in YBCO-Coated Conductors

Liu

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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Critical current is generally defined by the dc measurement at which current produces voltage of E c = 10 −4 Vm −1 . However, most applications of superconductor are operating at alternating current (ac). Moreover, the ac current-carrying capability of superconductor has attracted extensive attention. This paper is aimed to define the transport ac critical current and put forward a novel electric field criterion based on numerical modeling and experimental analysis. YBCO-coated conductor is investigated because of its power application potential and good anisotropy compared to Bi2223/Ag high-temperature superconductor. On measurement of I-V curves of YBCO-coated conductors at different frequency and liquid nitrogen temperature of 77 K, a novel criterion of transport ac critical current was proposed. Numerical modeling of finite element method was carried out, which was coincident with the experimental results.Index Terms-Alternate current capacity, frequency dependence, I-V curves, YBCO. 1051-8223

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Section: B Frequency Dependence Of I-v Characteristics Under Self-fieldmentioning

confidence: 94%

Section: B Frequency Dependence Of I-v Characteristics Under Self-fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Modeling and Experimental Analysis of AC Critical Current in YBCO-Coated Conductors

Liu

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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“…The parameters in (4) are: k = 0.2952, B 0 = 0.04265 T and α = 0.7 according to [8]. to the wide face of the HTS tape, respectively.…”

Section: ) Hts Tapes Electric Measurement Circuit Modelmentioning

confidence: 99%

An Experimental Investigation of Critical Current and Current Distribution Behavior of Parallel Placed HTS Tapes

Zhang

Zhu

et al. 2015

IEEE Trans. Appl. Supercond.

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The AC superconducting power transmission cable projects are being carried out around the world, while the DC superconducting cable is also proven to be very competitive for power transmission in electrical grid due to the negligible AC losses. The critical current and current distributions are two important factors to improve the performance of DC HTS cable for large transmission capacity. In this paper, we proposed an experimental method to investigate the behavior of critical current affected by various gap distances between the individual HTS tape and transverse tape width. The results show that the critical current of the HTS tape in the cable field can be increased by about 10% if the gap distance is less than 1 mm. Finite element method (FEM) is used to calculate the magnetic field distribution to verify the experimental results. A short HTS cable has been constructed to investigate the influence of contact resistance on the current distribution among the HTS tapes. The results show that the contact resistances have significant influence on the current sharing of each HTS wire in the cable structure.

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The Effects of Ferromagnetic Disks on AC Losses in HTS Pancake Coils with Nonmagnetic and Magnetic Substrates

Niu

Yong

Xia

et al. 2018

J Supercond Nov Magn

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Frequency-dependent critical current and transport ac loss of superconductor strip and Roebel cable

Cited by 78 publications

References 34 publications

Numerical Modeling and Experimental Analysis of AC Critical Current in YBCO-Coated Conductors

Numerical Modeling and Experimental Analysis of AC Critical Current in YBCO-Coated Conductors

An Experimental Investigation of Critical Current and Current Distribution Behavior of Parallel Placed HTS Tapes

The Effects of Ferromagnetic Disks on AC Losses in HTS Pancake Coils with Nonmagnetic and Magnetic Substrates

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