Transport ac losses in (Bi,Pb)SrCaCuO-2223/Ag multifilamentary tapes with different filament arrangements

Majoroš, M.; Glowacki, B.A.; Campbell, A.M.; Apperley, M.; Darmann, F.

doi:10.1016/s0921-4534(99)00451-7

Cited by 23 publications

(10 citation statements)

References 14 publications

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“…͑1͒ that is derived from the CS model assuming E = 0 when ͉J͉ Ͻ J c . [4][5][6][7] In the present work, we will derive a transport scaling law for the cylinder with PL E͑J͒, so thataccompanied by a set of numerically calculated results-the above mentioned relation is quantitatively obtained and may be conveniently used in the ac loss research of HTS tapes.…”

Section: Alternating Current Loss In a Cylinder With Power-law Currenmentioning

confidence: 99%

Alternating current loss in a cylinder with power-law current-voltage characteristic

Chen

2005

Applied Physics Letters

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The transport ac loss Q in a superconducting cylinder of radius a with a power-law current-voltage characteristic E=Ec∣J∕Jc∣n as a function of current amplitude Im is numerically calculated for a set of given values of a,Jc, and frequency f at n=5, 10, 20, and 30. After deriving a scaling law and defining a critical frequency fc, the results can be converted and interpolated to those for any values of a, Jc, f, and 5⩽n⩽30. The “power-law” Q(Im) at f=fc is a better alternative of the critical-state Q(Im), used not only for describing the features of Q(Im,f) of high-temperature superconductors but also for planning Q measurements and their interpretation.

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Section: Alternating Current Loss In a Cylinder With Power-law Currenmentioning

confidence: 99%

Alternating current loss in a cylinder with power-law current-voltage characteristic

Chen

2005

Applied Physics Letters

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“…3(b) that when the voltage is positive, the sum of ac and dc currents is larger than the wire's critical current, and the waveform of loss voltage appears to show a resistive voltage. It is known that when current amplitude is larger than the critical current, transport ac losses decrease with increasing frequency, which is similar to the normal metal ac loss [10]. However, when the voltage is negative, the current is smaller than the wire's critical current, and the waveform of loss voltage resembles a typical super conducting voltage.…”

Section: Experiments and Numerical Modelmentioning

confidence: 85%

A Study on AC Losses of HTS Pentagonal Conductors Consisting of 2G Wires Carrying DC Offset Transport Current

Yao

et al. 2015

IEEE Trans. Appl. Supercond.

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In a high-voltage dc (HVDC) transmission system, a high-temperature superconducting (HTS) dc cable is a feasible candidate due to its high power density. However, the dc in the grid includes ac ripple generated from switching devices and the environment, which can cause ac losses. In this paper, two pentagonal conductors consisting of second-generation (2G) wires are prepared, and their ac losses are investigated under the application of current with ac and dc components. Moreover, a numerical analysis is performed for both conductors to compare the measured losses. The results show that the measured ac losses correspond well with the numerical ones calculated by our models. The dc offset current does not affect the ac losses when the total current is smaller than the critical current, and the ac losses depend on the amplitude of the ac component. All measured losses are verified by evaluating the dependence on the arrangement of the voltage leads, the contact position, and the frequency.Index Terms-AC loss, DC offset current, finite element method, pentagonal multi-wire conductor.

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“… and define the thickness and electrical resistivity of the material. At K the Nb barrier becomes SC following the same power law for the MgB 61 , i.e., , with V/cm, , and n=116. K cm for the Nb barrier 59 and 1.91 cm for NbTi 58 .…”

Section: Possible Alternatives For the Reduction Of Energy Losses In ...mentioning

confidence: 95%

“… At K the Nb barrier becomes SC following the same power law for the MgB 61 , i.e., , with V/cm, , and n=116.…”

Section: Possible Alternatives For the Reduction Of Energy Losses In ...mentioning

confidence: 95%

Maximum reduction of energy losses in multicore MgB2 wires by metastructured soft-ferromagnetic coatings

Kapolka

2022

Sci Rep

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When compared with rare-earth coated conductors, magnesium diboride superconducting cables are known to show significant advantages by cost and easy production. However, the inherent difficulty for achieving a significant reduction of their magnetization losses in multifilamentary wires, without degrading the high critical current density that is so characteristic of the monowire, is considered as one of the major drawbacks for their practical use in high power density applications. Being this one of the major markets for superconducting cables, from fundamental principles and computational optimization techniques, in this paper we demonstrate how the embedding of the superconducting filaments into soft-ferromagnetic metastructures can render to their full magnetic decoupling, and therefore, to the maximum reduction of the energy losses that can be achieved without deteriorate the critical current density of the cable. The designed multifilamentary metastructure is made of NbTi coated MgB2 superconducting filaments in a Cu-matrix, serving as a reference for validating our model with actual experimental measurements in monowires and multifilamentary wires. The novelty in our computationally aided multifilamentary wires, is that each one of the filaments is embedded within a thin metastructure made of a soft-ferromagnetic layer and a resistive layer. We have found that for soft-ferromagnetic layers with magnetic permeabilities in the range of $$\mu _{r}=$$ μ r = 20–100, nearly a full magnetic decoupling between the superconducting filaments can be achieved, leading to efficiencies higher than $$92\%$$ 92 % , and an overall reduction of the AC-losses (including eddy currents at the Cu-matrix) higher than $$50\%$$ 50 % .

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Transport ac losses in (Bi,Pb)SrCaCuO-2223/Ag multifilamentary tapes with different filament arrangements

Cited by 23 publications

References 14 publications

Alternating current loss in a cylinder with power-law current-voltage characteristic

Alternating current loss in a cylinder with power-law current-voltage characteristic

A Study on AC Losses of HTS Pentagonal Conductors Consisting of 2G Wires Carrying DC Offset Transport Current

Maximum reduction of energy losses in multicore MgB2 wires by metastructured soft-ferromagnetic coatings

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