Numerical simulation for AC losses of HTS tapes in combined alternating transport current and external AC magnetic field with phase shift

Komori, Kazuhiro; Takenaka, Atsushi; Kawasaki, Kyozi; Iwakuma, Masataka; Funaki, K.

doi:10.1109/77.920305

Cited by 17 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured loss in a typical tape is displayed as open symbols in figure 3. Closed symbols represent the predicted loss, calculated with equations ( 11) and (12). This tape has a somewhat steeper dependence of loss on current, and somewhat lower resistive loss, than predicted with the model.…”

Section: Alternating Currentmentioning

confidence: 87%

“…Since evaluation of the complete critical-state model [6] becomes difficult in this case, the descriptions tend to be (semi-)empirical. Numerical modelling has also been used for a single tape with ac current in ac field [12]. However, it is difficult to reproduce the numerical results of other groups, and the numerical evaluation of an entire coil still takes much calculation time.…”

Section: Ac Current and Alternating Magnetic Field In Arbitrary Orien...mentioning

confidence: 99%

See 1 more Smart Citation

Modelling and measurement of ac loss in BSCCO/Ag-tape windings

Oomen

Nanke

Leghissa

2003

Supercond. Sci. Technol.

View full text Add to dashboard Cite

High-temperature superconducting (HTS) transformers promise decreased weight and volume and higher efficiency. A 1 MVA HTS railway transformer was built and tested at Siemens AG. This paper deals with the prediction of ac loss in the BSCCO/Ag-tape windings. In a railway transformer the tape carries ac current in alternating field, the temperature differs from 77 K, tapes are stacked or cabled and overcurrents and higher harmonics occur. In ac-loss literature these issues are treated separately, if at all. We have developed a model that predicts the ac loss in sets of BSCCO/Ag-tape coils, and deals with the above-mentioned issues. The effect of higher harmonics on the loss in HTS tapes is considered for the first time. The paper gives a complete overview of the model equations and required input parameters. The model is validated over a wide range of the input parameters, using the measured critical current and ac loss of single tapes, single coils and sets of coils in the 1 MVA transformer. An accuracy of around 25% is achieved in all relevant cases. Presently the model is developed further, in order to describe other HTS materials and other types of applications.

show abstract

Section: Alternating Currentmentioning

confidence: 87%

Section: Ac Current and Alternating Magnetic Field In Arbitrary Orien...mentioning

confidence: 99%

Modelling and measurement of ac loss in BSCCO/Ag-tape windings

Oomen

Nanke

Leghissa

2003

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In particular, in three-phase transmission lines or transformers the situation is complicated by the fact that the self-field and the applied field may differ in phase considerably. There are not very many calculations and experimental results dealing with these problems; however, some of the latest results (Kajikawa et al 2001, Nguyen et al 2005a, 2005b, Vojenčiak et al 2006 lead inevitably to the conclusion that the maximum and minimum losses are not at the phase difference of 0 or π/2, as one would expect from simple considerations (Ashworth and Suenaga 1999, Rabbers et al 2001, Carr 2001, Takács 2004, Mawatari and Kajikawa 2007. These results were confirmed by both electromagnetic and calorimetric measurements.…”

Section: Introductionmentioning

confidence: 84%

Hysteresis losses in superconductors with an out-of-phase applied magnetic field and current: slab geometry

Takács

2007

Supercond. Sci. Technol.

View full text Add to dashboard Cite

We calculate the hysteresis losses in the slab geometry configuration for an applied magnetic field and current with a phase shift between them. The result leads to maximum losses with the field and current in phase and minimum losses at a phase shift of π/2. Although until now we have had no explanation of some experimental results suggesting a shift for both these extreme values, the dependence on the phase shift of the calculated ratio between the minimum and maximum losses is in good agreement with these results. Therefore, they can be used in a first approximation for designing magnetic systems with high-Tc superconductors for those AC applications in which phase shift can occur. In addition, it is emphasized that the results can be very different, depending on the form of the temporary change of the applied field and current, in contradistinction to the case of applying only the field or current. A linear temporary change is given as an example, which demonstrates that the loss decrease at non-zero phase shift can be considerably higher than for the sinusoidal field and current change.

show abstract

“…These calculations predict that the ac loss maximum is when the alternating current and field are in phase with each other. However, simulations for slabs [139] and elliptical wires [140], [75] show that for large applied fields, the ac loss maximum is at intermediate phase shifts for both a powerlaw E(J) relation and the critical-state model. Experiments confirm this [140], [75].…”

Section: Solutions For Particular Casesmentioning

confidence: 96%

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

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

317

272

View full text Add to dashboard Cite

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.

show abstract

Numerical simulation for AC losses of HTS tapes in combined alternating transport current and external AC magnetic field with phase shift

Cited by 17 publications

References 4 publications

Modelling and measurement of ac loss in BSCCO/Ag-tape windings

Modelling and measurement of ac loss in BSCCO/Ag-tape windings

Hysteresis losses in superconductors with an out-of-phase applied magnetic field and current: slab geometry

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

Contact Info

Product

Resources

About