Advanced ac loss measurement methods for high-temperature superconducting tapes

Rabbers, J.J.; Haken, Bernard ten; Kate, H.H.J. ten

doi:10.1063/1.1367361

Cited by 59 publications

(79 citation statements)

References 9 publications

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“…In the EM method, the total ac loss dissipated in an HTS tape, when it carries an ac transport current in an ac magnetic field, is determined as the sum of the magnetization loss component (which is delivered by the applied magnetic field (or magnet) and is usually measured by a pick-up coil) and the transport current loss component (which is delivered by the transport current (or its power supply) and is usually measured by a voltage loop soldered to the sample) [1], [4], [9]. Fig.…”

Section: A Experimental Setupmentioning

confidence: 99%

Temperature Dependence of Total AC Loss in High-Temperature Superconducting Tapes

Nguyen

Sastry

Knoll

et al. 2009

IEEE Trans. Appl. Supercond.

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A versatile experimental facility was designed and set up to measure transport ac losses, magnetization ac losses, and total ac losses in high-temperature superconductors at variable temperatures. Several sets of measurements were carried out in the temperature range of 35 K to 100 K. Sample temperature during the measurements could be controlled within 0.5 K of set temperature. Temperature dependence of transport losses reflects variation of critical current density of the tapes with temperature. Temperature dependence of magnetization losses exhibits an interesting behavior with a peak, whose position shifts to lower temperatures as the magnetic field is increased. Experimental data of ac losses at various temperatures are compared with those calculated using numerical methods. Generally, the simulated results reproduce well the experimental data.

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Section: A Experimental Setupmentioning

confidence: 99%

Temperature Dependence of Total AC Loss in High-Temperature Superconducting Tapes

Nguyen

Sastry

Knoll

et al. 2009

IEEE Trans. Appl. Supercond.

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“…1,2 The calorimetric method therefore was employed to evaluate the effect of ⌬ on total ac loss in HTS tapes. Electromagnetic methods, however, can be used only if transport current and applied magnetic field are in phase, while calorimetric methods can be used to measure the total ac loss even if they are out of phase.…”

mentioning

confidence: 99%

Experimental and numerical studies of the effect of phase difference between transport current and perpendicular applied magnetic field on total ac loss in Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox tape

Nguyen

Pamidi

Knoll

et al. 2005

Journal of Applied Physics

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The effect of phase difference between transport current and perpendicular applied magnetic field, Δφ, on total ac loss in multifilamentary, silver-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox (Bi-2223) superconducting tapes was calculated numerically using Brandt’s equation [Phys. Rev. B 54, 4246 (1996)] and the results were compared with experimental results obtained by the calorimetric method. In the numerical calculations, the superconducting transition was modeled by E-J characteristics represented by a power law. The dependence of critical current density on the n value was taken into account. The dependence of critical current density and n value on applied magnetic field was obtained from experimental data. It was observed that Δφ has a significant effect on the loss behavior of Bi-2223 tapes and depends strongly on the relative values of transport current and applied magnetic field. The effects of Δφ on the individual components of transport loss and magnetization loss were also calculated. Good agreement between the calculated and experimental results is demonstrated.

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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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Advanced ac loss measurement methods for high-temperature superconducting tapes

Cited by 59 publications

References 9 publications

Temperature Dependence of Total AC Loss in High-Temperature Superconducting Tapes

Temperature Dependence of Total AC Loss in High-Temperature Superconducting Tapes

Experimental and numerical studies of the effect of phase difference between transport current and perpendicular applied magnetic field on total ac loss in Ag-sheathed (Bi,Pb)2Sr2Ca2Cu3Ox tape

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

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