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Temperature dependence of AC losses in a BSCCO/Ag tape exposed to AC magnetic fields applied in different orientations
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electric Power Systems.
KTH, Superseded Departments, Electrical Systems.
2002 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 372, 1818-1822 p.Article in journal (Refereed) Published
Abstract [en]

When high-temperature superconducting tapes are used in electrotechnical applications, they have an optimal working point in temperature. In the winding of e.g. a transformer the conductor carrying an AC current is exposed to an AC magnetic field oriented differently in separate parts of the winding. To determine the optimal working temperature it is essential to study the temperature dependence of the AC losses under these conditions. In this study, we present experimental results of the losses in a multi-filamentary silver-sheathed Bi-2223 high-temperature superconducting tape carrying an AC transport current in an AC magnetic field applied in different orientations perpendicular to the current path. The losses were measured calorimetrically in the temperature interval 40-85 K. The experimental results are compared to semi-empirical models of the AC losses.

Place, publisher, year, edition, pages
2002. Vol. 372, 1818-1822 p.
Keyword [en]
high-temperature superconductor, AC losses, field orientations, temperature dependence
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5347DOI: 10.1016/S0921-4534(02)01134-6ISI: 000178019100123OAI: oai:DiVA.org:kth-5347DiVA: diva2:9309
Note
5th European Conference on Applied Superconductivity (EUCAS 2001) Location: TECH UNIV DENMARK, LYNGBY, DENMARK Date: AUG 26-30, 2001 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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