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AC losses in a BSCCO/Ag tape carrying AC transport currents in AC magnetic fields applied in different orientations
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electric Power Systems.
2001 (English)In: IEEE transactions on applied superconductivity (Print), ISSN 1051-8223, E-ISSN 1558-2515, Vol. 11, no 4, 4123-4127 p.Article in journal (Refereed) Published
Abstract [en]

In most prospective electric power applications of high-temperature superconductors (HTSs), the conductor is wound in a coil configuration. For a coil of finite length, the magnetic field orientation is axial in the middle of the coil, while the field contains a substantial radial component at the coil ends. In a superconducting BSCCO/Ag tape, the ac losses depend strongly on the orientation of the magnetic field. In this study, we present experimental results of the ac losses in a multifilamentary silver-sheathed Bi-2223 HTSs tape, carrying alternating transport currents in externally applied alternating magnetic fields at different orientations, with respect to the face of the tape and perpendicular to the transport current. The ac losses were measured calorimetrically, at fixed temperature and frequency. The results are compared to semi-empirical models of the ac losses in HTSs tape. We present a more general model of the angular dependence of the ac losses.

Place, publisher, year, edition, pages
2001. Vol. 11, no 4, 4123-4127 p.
Keyword [en]
AC losses, calorimetric measurement, HTS, magnetic field orientations, transport current
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5344DOI: 10.1109/77.979853ISI: 000173370100003OAI: oai:DiVA.org:kth-5344DiVA: diva2:9306
Available from: 2004-10-10 Created: 2004-10-10 Last updated: 2017-11-30Bibliographically approved
In thesis
1. AC losses in HTS as a function of magnetic fields with arbitrary directions
Open this publication in new window or tab >>AC losses in HTS as a function of magnetic fields with arbitrary directions
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Although a superconductor has zero resistivity when carrying a direct current, losses do occur when it is exposed to an alternating magnetic field and/or is carrying an alternating current. The magnitude of these so-called AC losses depends on the operating temperature, the amplitude and the direction of the magnetic field, the transport current, and the frequency. Therefore, the use of high-temperature superconductors, HTSs, in electric power components such as cables, transformers or reactors, requires knowledge of the AC losses.

This thesis deals with the development of AC loss models for HTSs, mainly for Bi-2223 tapes. In particular, the orientation of the applied magnetic field is taken into account in the modelling. The basis for the models is the results of experimental investigations.

The basic concepts of HTSs with special emphasis on the modelling of AC losses are presented. These can be broken down into several components. Their sources and natures are described. One of the components is the hysteretic loss and it is the dominating loss in AC applications at power frequencies. Therefore, the other loss components are neglected in the modelling.

Models are presented and the associated parameters are investigated with respect to their dependence of the magnetic field as well as the temperature. The AC losses for parallel and perpendicular magnetic field with respect to the wide side of the tape are calculated numerically. Moreover, a semi-empirical model for intermediate angels of the applied magnetic field is proposed. The comparisons show good agreement with experimental results.

Keywords: High-temperature superconductors, AC loss modelling, hysteresis, E-J characteristic.

Place, publisher, year, edition, pages
Stockholm: Elektrotekniska system, 2004
Series
TRITA-ETS, ISSN 1650-674X ; 2004:06
Keyword
Electronics, High-temperatur superconductors, AC loss modelling, hysteresis, E - J characteristic, Elektronik
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-35 (URN)91-7283-855-8 (ISBN)
Public defence
2004-10-22, Kollegiesalen, KTH, Valhallavägen 79, Stockholm, 10:15
Opponent
Supervisors
Note

QCR 20161026

Available from: 2004-10-10 Created: 2004-10-10 Last updated: 2016-10-26

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