Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Development of loss models for a high-temperature superconducting tape
KTH, Superseded Departments, Electrical Systems.
2001 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

In the recent years significant progresses in thedevelopment of high-temperature superconductors have been made.It is realistic to believe that power applications, based onthese conductors, in a few years will become available. To beable to utilise the conductors in an optimum way, theunderstanding of their behaviour under application-likecondition is essential. One important parameter that has to beoptimised is the power loss, which means that mathematicalmodels of these losses have to be developed. In a typicalapplication the superconductor is utilised in a coilconfiguration where the actual magnetic field is considerablehigher than for a straight structure. For power frequencies thelosses are dominated by hysteresis losses and flux flowlosses.

In this thesis, mathematical models of the hysteresis andthe flux flow losses as a function of a transport current, anexternal magnetic field, the temperature and the frequency havebeen developed. The transport current and the magnetic field,which are assumed to be proportional to each other, includeboth an ac and a dc component. The models of the hysteresislosses are based on the critical state theory, and for twoidealised geometries, an infinite slab and a thin strip, newexact closed form equations have been derived. The equationsfor the two idealised geometries are then superimposed tofacilitate the description of a more realistic geometry, i.e. asuperconducting tape with a finite width and thickness. Themodel of the flux flow losses is valid for a tape shapedconductor and is based on both measurements and reasonablephysical assumptions. For the development and the validation ofthe models, a calorimetric measurement set-up has been used.From a limited number of relatively simple measurements, thedeveloped models can be adjusted to a certain superconductor,and the power losses for the actual superconductor can bepredicted in considerable more complicated cases.

Keywords:high-temperature superconductor, hysteresislosses, flux flow losses, critical state model, calorimetricmeasurements

Place, publisher, year, edition, pages
Stockholm: Elektrotekniska system , 2001. , vi, 121 p.
Series
Trita-ETS, ISSN 1650-674X ; 2001-03
Keyword [en]
high-temperature superconductor, hysteresis losses, flux flow losses, critical state model, calorimetric measurements
Identifiers
URN: urn:nbn:se:kth:diva-3268ISBN: OAI: oai:DiVA.org:kth-3268DiVA: diva2:9051
Public defence
2001-12-14
Note
NR 20140805Available from: 2001-12-13 Created: 2001-12-13Bibliographically approved

Open Access in DiVA

fulltext(1435 kB)795 downloads
File information
File name FULLTEXT01.pdfFile size 1435 kBChecksum MD5
a5d30875b9b28936e581ca1907e18437ff0fbf5e120b4519c2c9853ffce395ac86119eac
Type fulltextMimetype application/pdf

By organisation
Electrical Systems

Search outside of DiVA

GoogleGoogle Scholar
Total: 795 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 291 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf