AC losses in transport current regime in applied AC magnetic field: experimental analysis and modeling [superconducting cables]

Zannella, S.; Montelatici, L.; Grenci, Gianluca; Pojer, Mirko; Janšák, L.; Majoroš, M.; Coletta, G.; Mele, R.; Tebano, R.; Zanovello, F.

doi:10.1109/77.920356

Cited by 17 publications

(16 citation statements)

References 8 publications

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“…Self-field transport losses of the stacks at 60 Hz agreed excellently with Norris formulae for the elliptical model [3], that describes well the behaviour of the single tapes due to pure hysteresis [5]. This means that the losses in the stacks were dominated by hysteresis at liquid nitrogen temperatures.…”

Section: B Ac Loss Measurements On Stackssupporting

confidence: 70%

DC and AC Electrical Characterization of Stacks of HTS Tapes

Ginocchio

Ballarino

Perini

et al. 2007

IEEE Trans. Appl. Supercond.

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Today the Bi-2223 tape represents a suitable candidate for the use in various HTS devices. The LHC current leads use Bi-2223 tapes soldered together in short lengths, forming stacks of rugged HTS conductors. Critical current and AC loss measurements were performed on BSCCO stacks, in the temperature range of 65 K and 77 K and in magnetic fields of up to 0.5 T. The experimental results reported in this paper give a broad description of the stacks behavior in the range of current and field values of practical interest, and provide design parameters for the optimization of current leads operating both in DC and pulsed conditions.

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Section: B Ac Loss Measurements On Stackssupporting

confidence: 70%

DC and AC Electrical Characterization of Stacks of HTS Tapes

Ginocchio

Ballarino

Perini

et al. 2007

IEEE Trans. Appl. Supercond.

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“…However, the earliest numerical calculations are for a power-law E(J) relation [26]. Elliptical wires with a power law are computed and discussed in detail by several authors [93], [136], [35], [27]. The latter reference also compares different shapes: round, elliptical and rectangular wires.…”

Section: Solutions For Particular Casesmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

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Numerical modeling of superconductors is widely recognized as a powerful tool for interpreting experimental results, understanding physical mechanisms and predicting the performance of high-temperature superconductor (HTS) tapes, wires and devices. This is especially true for ac loss calculation, since a sufficiently low ac loss value is imperative to make these materials attractive for commercialization. In recent years, a large variety of numerical models, based on different techniques and implementations, have been proposed by researchers around the world, with the purpose of being able to estimate ac losses in HTSs quickly and accurately. This article presents a literature review of the methods for computing ac losses in HTS tapes, wires and devices. Technical superconductors have a relatively complex geometry (filaments, which might be twisted or transposed, or layers) and consist of different materials. As a result, different loss contributions exist. In this paper, we describe the ways of computing such loss contributions, which include hysteresis losses, eddy current losses, coupling losses, and losses in ferromagnetic materials. We also provide an estimation of the losses occurring in a variety of power applications.

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“…For concluding this study, we would like to remind that the common interest of studying rounded SC wires, lies on the fact that exact analytical approaches can be found for the calculation of AC losses when isolated excitations are considered, I tr (t) or B 0y (t), both serving as a benchmark for the estimation of the energy losses in practical applications. In fact, it is common to assume that the heat release by a SC wire under both excitations, I tr and B 0y , can be estimated by the linear sum between their individual contributions [16,[40][41][42][43], at least for cases with low values of magnetic field and high transport current or vice versa [16,[44][45][46]. However, it has been already demonstrated in Ref.…”

Section: Discussionmentioning

confidence: 99%

Magnetic characteristics and AC losses of DC type-II superconductors under oscillating magnetic fields

Robert

2018

Supercond. Sci. Technol.

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Remarkable features on the magnetic moment of type-II superconducting wires of cylindrical shape, subjected to direct current conditions (DC) and transverse oscillating (AC) magnetic fields, are reported. We show how for relatively low amplitudes of the applied magnetic field, Ba, the superconducting wire rapidly develops a saturation state, |Mp|, characterizing the limits of magnetization loops that exhibit a Boolean-like behaviour. Regardless of the premagnetization state of the superconducting wire, we show how after two cycles of magnetic relaxation, boolean-like ±Mp states can be measured during the entire period of time from which the external magnetic field B0 ranges from 0 to ±Ba, with the signs rule defined by the sign of the slope ∆B0y(t). In addition, for the practical implementation of superconducting DC wires sharing the right of way with AC lines, we report that for relatively low values of magnetic field, Ba ≤ BP /2, being BP the analytical value for the full penetration field in absence of transport current, Itr, the use of semi-analytical approaches for the calculation of AC-losses leads to a significant underestimation of the actual contribution of the induction losses. This phenomena is particularly relevant at dimensionless fields ba < 1 − i 2/3 a , being ba = Ba/BP and, ia = Ia/Ic the amplitude of an AC or DC transport current, due to the local motion of flux front profiles being dominated by the occurrence of transport current. On the other hand, we have found that regardless of the nature of the transport current, either be DC or AC, when a transverse oscillating magnetic field greater than the classical limit ba = (1 − ia) is applied to the SC wire, the difference between the obtained AC losses in both situations results to be negligible indistinctly of the approach used, semi-analytical or numerical. Thus, the actual limits from which the estimation of the AC-losses can be used as an asset for the deployment of DC SC wires sharing the right of way with AC lines, against the sole use of SC wires for the transmission of AC transport current, are established.

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AC losses in transport current regime in applied AC magnetic field: experimental analysis and modeling [superconducting cables]

Cited by 17 publications

References 8 publications

DC and AC Electrical Characterization of Stacks of HTS Tapes

DC and AC Electrical Characterization of Stacks of HTS Tapes

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Magnetic characteristics and AC losses of DC type-II superconductors under oscillating magnetic fields

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