Energy losses in YBCO-123 coated conductors carrying transport current in perpendicular external magnetic field

Ciszek, M.; Tsukamoto, O.; Ogawa, J.; Miyagi, Daisuke

doi:10.1063/1.1472593

Cited by 32 publications

(34 citation statements)

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“…The magnetization loss was measured using the calibration free method 33 In this work, we use a simple voltage-tap connection with the wire parallel to the tape length ( figure 4) in order to obtain the transport loss. This connection differs from the spiral-shaped or S-shaped loops previouly used in several articles [36][37][38][39] . Although Spiraland S-shaped loops are necessary for measuring the AC voltage that causes AC loss in AC current, simple voltage taps are sufficient to measure the DC voltage component in dynamic magneto-resistance experiments.…”

Section: B Ac Loss Measurementsmentioning

confidence: 90%

Ripple field losses in direct current biased superconductors: Simulations and comparison with measurements

Lahtinen

Pardo

Šouc

et al. 2014

Journal of Applied Physics

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Articles you may be interested inMicrostructure dependence of the c-axis critical current density in second-generation YBCO tapes Singular current density in the planar superconductor/normal metal/superconductor junctionIn several superconducting applications, as, for example, in some supercondcuting generators, motors, and power transmission cables, the superconductor experiences a changing magnetic field in a DC background. Simulating the losses caused by this AC ripple field is an important task from the application design point of view. In this work, we compare two formulations, the H-formulation and the minimum magnetic energy variation-formulation, based on the eddy current model (ECM) and the critical state model (CSM), respectively, for simulating ripple field losses in a DC biased coated conductor tape. Furthermore, we compare our simulation results with measurements. We investigate the frequency-dependence of the hysteresis loss predictions of the power law based ECM and verify by measurements, that in DC use, ECM clearly over-estimates the homogenization of the current density profile in the coated conductor tape: the relaxation of the local current density is not nearly as prominent in the measurement as it is in the simulation. Hence, we suggest that the power law resistivity, used as the local relation between the electric field intensity E and current density J in ECM, is not an intrinsic property of high-temperature superconductors. The difference between the models manifests itself as discrepancies in ripple field loss simulations in very low AC fields with significant DC fields or currents involved. The results also show, however, that for many practical situations, CSM and ECM are both eligible models for ripple field loss simulations. V C 2014 AIP Publishing LLC. [http://dx.

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Section: B Ac Loss Measurementsmentioning

confidence: 90%

Ripple field losses in direct current biased superconductors: Simulations and comparison with measurements

Lahtinen

Pardo

Šouc

et al. 2014

Journal of Applied Physics

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“…In the calculation, is estimated by using at . The discrepancy between the measured data and theoretical curve is considered to be caused by the extra losses due to the dynamic resistance losses [11]. Especially for the case of 0.9 ( A) the loss curve significantly departs from the curves for smaller transport currents, because A exceeded the critical current for mT and the tape was in the flux flow state where extra losses were produced.…”

Section: Total Lossesmentioning

confidence: 98%

“…Therefore, the AC loss characteristics of such wires should be studied. Many publications have reported on the total losses for Bi/Ag sheathed tapes [3]- [9] but few for YBCO tapes [10], [11]. It is understood that electrical measurements of the total losses in YBCO tapes are difficult because of peculiar magnetic field distribution at the edges of the tape due to very high aspect ratio.…”

Section: Introductionmentioning

confidence: 98%

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AC losses in YBCO coated conductors carrying AC transport currents in perpendicular AC external magnetic field

Ogawa

Shiokawa

Ciszek

et al. 2003

IEEE Trans. Appl. Supercond.

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The paper reports an experimental study on AC loss characteristics of a YBCO coated tape conductor carrying AC transport current in AC external magnetic field. In the experiment we electrically measured total losses that were transport current losses plus magnetization losses in AC external magnetic fields perpendicular to the tape surfaces. The transport current losses were measured by a four terminal method and the magnetization losses by a method using a pick-up coil. To measure the total losses electrically we need to pay proper attentions to prevent electromagnetic coupling between the sample currents and the external magnetic fields and to suppress inductive voltage in signals from the pick-up coil and voltage taps. The total losses were purely hysteretic for the amplitude of the external field up to 20 mT and the peak transport current up to the critical current. The loss characteristics can be explained by a theory based on the Bean model if the dependence of the critical current on the external magnetic field is taken into consideration.

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“…The AC losses directly affect the efficiency and feasibility of these AC applications, making it important to clarify and reduce the AC losses in the conductors. Many papers report the magnetization loss of YBCO coated conductors to be high when a tape is subjected to an external magnetic field perpendicular to the tape's face [4]- [6]. This characteristic has led to YBCO coated conductors being manufactured in a form of monocore, usually as 10 mm wide tapes, as the magnetization loss is proportional to the width of the superconducting tape.…”

Section: Introductionmentioning

confidence: 97%

Magnetization Loss in a Striated YBCO Coated Conductor Considering the Intrinsic Critical Current Distribution

Ogawa

Fukui

Yamaguchi

et al. 2006

IEEE Trans. Appl. Supercond.

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In this work we present numerical analysis results of the magnetization loss in a perpendicular AC magnetic field. The numerical analysis is based on the relation of the linkage magnetic flux to current distribution, and takes into account the c characteristic, and value-characteristic. We discuss the relation between the magnetization losses with striated superconducting tape and the semicylindrical intrinsic critical current density distribution across the width of the superconducting tape. The result shows that the magnetization loss of monocore superconducting tape in a low magnetic field is affected by the intrinsic semicylindrical critical current density distribution. With a striated structure, the influence of the intrinsic critical current density distribution is reduced.

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Energy losses in YBCO-123 coated conductors carrying transport current in perpendicular external magnetic field

Cited by 32 publications

References 1 publication

Ripple field losses in direct current biased superconductors: Simulations and comparison with measurements

Ripple field losses in direct current biased superconductors: Simulations and comparison with measurements

AC losses in YBCO coated conductors carrying AC transport currents in perpendicular AC external magnetic field

Magnetization Loss in a Striated YBCO Coated Conductor Considering the Intrinsic Critical Current Distribution

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