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Measurements and estimation of the complex valued permeability of magnetic steel
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). (Waves and Signals)
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE). (Waves and Signals)ORCID-id: 0000-0002-7018-6248
2015 (Engelska)Rapport (Övrigt vetenskapligt)
Abstract [en]

This report is intended as a tutorial on electromagnetic modeling to measure and estimate the complex valued relative permeability of magnetic steel. The main application is with the estimation of the electromagnetic material parameters of the armour wires used with high-voltage AC power cables.

When the magnetic field intensity is sufficiently far from saturating the magnetic steel, the magnetic hysteresis phenomena can be approximated by using a linearization approach based on a complex valued (and frequency and amplitude dependent) relative permeability. In the report it is demonstrated how the complex valued permeability of magnetic steel can be efficiently estimated in the presence of a strong skin-effect. This is achieved by using a simple transformer coil built on the magnetic steel to be tested and by efficient numerical modeling based on waveguide theory and complex analysis. Numerical computations based on the Finite Element Method (FEM) and the commercial software COMSOL are employed to establish when edge effects can be ignored in the simplified analytical model.

Ort, förlag, år, upplaga, sidor
2015. , s. 29
Nationell ämneskategori
Annan elektroteknik och elektronik
Forskningsämne
Fysik, Vågor och signaler
Identifikatorer
URN: urn:nbn:se:lnu:diva-48445OAI: oai:DiVA.org:lnu-48445DiVA, id: diva2:885132
Forskningsfinansiär
Stiftelsen för strategisk forskning (SSF)Tillgänglig från: 2015-12-18 Skapad: 2015-12-18 Senast uppdaterad: 2017-06-09Bibliografiskt granskad
Ingår i avhandling
1. Estimation of electromagnetic material properties with application to high-voltage power cables
Öppna denna publikation i ny flik eller fönster >>Estimation of electromagnetic material properties with application to high-voltage power cables
2017 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Efficient design of high-voltage power cables is important to achieve an economical delivery of electric power from wind farms and power plants over the very long distances as well as the overseas electric power. The main focus of this thesis is the investigation of electromagnetic losses in components of high-voltage power cables. The objective of the ongoing research is to develop the theory and optimization techniques as tools to make material choices and geometry designs to minimize the high-frequency attenuation and dispersion for HVDC power cables and the power losses associated with HVAC cables. Physical limitations, dispersion relationships and the application of sum rules as well as convex optimization will be investigated to obtain adequate physical insight and a priori modeling information for these problems.

For HVAC power cables, the objectives are addressed by performing measurements and estimation of complex valued permeability of cable armour steel in Papers I and II. Efficient analytical solutions for the electromagnetic field generated by helical structures with applications for HVAC power cables have been obtained in Paper III.

For HVDC power cables, estimation of insulation characteristics from dielectric spectroscopy data using Herglotz functions, convex optimization and B-splines, has been investigated in Papers V and VI. The unique solution requirements in waveguide problems have been reviewed in Paper IV.

Ort, förlag, år, upplaga, sidor
Linnaeus University Press, 2017. s. 19
Serie
Lnu Licentiate ; 2
Nyckelord
Material losses, power cables, cylindrical multipole expansion, Herglotz functions, convex optimization, sum rules
Nationell ämneskategori
Annan elektroteknik och elektronik
Forskningsämne
Fysik, Vågor och signaler
Identifikatorer
urn:nbn:se:lnu:diva-64265 (URN)978-91-88357-77-9 (ISBN)
Presentation
2017-06-14, C1202, Newton, Hus C, Växjö, 10:15 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Stiftelsen för strategisk forskning (SSF), AM13-0011
Tillgänglig från: 2017-06-09 Skapad: 2017-06-09 Senast uppdaterad: 2017-09-01Bibliografiskt granskad

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Ivanenko, YevhenNordebo, Sven

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