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Contact-free Measurement of Currents inTwo-dimensional Parallel Conductors Using the Green Identity Approach
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH.ORCID iD: 0000-0002-9665-8557
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-9241-8030
2016 (English)In: 2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016, IEEE, 2016, p. 338-340, article id 7571391Conference paper, Published paper (Refereed)
Abstract [en]

The Green identity approach is used to reconstructcurrents in very long parallel conductors above the groundfrom magnetic field data measured at some points under theconductors. By assuming that the conductor positions are known,this method can be used for contact-free measurement of currentsin transmission lines in power system. This method gives thepossibility of measuring high-frequency currents which cannotbe measured with current transformers.

Place, publisher, year, edition, pages
IEEE, 2016. p. 338-340, article id 7571391
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-199633DOI: 10.1109/URSI-EMTS.2016.7571391ISI: 000389770800097Scopus ID: 2-s2.0-84992126325ISBN: 978-1-5090-2502-2 (print)OAI: oai:DiVA.org:kth-199633DiVA, id: diva2:1064145
Conference
2016 URSI International Symposium on Electromagnetic Theory, EMTS 2016; Espoo; Finland; 14 August 2016 through 18 August 2016
Note

QC 20170116

Available from: 2017-01-11 Created: 2017-01-11 Last updated: 2017-03-07Bibliographically approved
In thesis
1. Remote contact-free reconstruction of currents in two-dimensional parallel conductors
Open this publication in new window or tab >>Remote contact-free reconstruction of currents in two-dimensional parallel conductors
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, the theory of the remote contact-free reconstruction of currents in two-dimensional parallel conductors is investigated. The motivation of this study is finding a complement technique to measurement transformers which are the well-established devices to measure currents in power transmission lines. This technique would provide the possibility of measuring currents at different locations of a power system, as well as, at different frequencies.

 

Remote contact-free determination of currents is an electromagnetic inverse source problem in which the currents are reconstructed from the magnetic field data collected by a set of sensors located in the vicinity of the conductors. Since the sensors are not too close to the conductors, the main challenge is the effect of the disturbance fields produced by the external sources in the measurement.

 

In the case that the external sources produce three-dimensional disturbance fields, the magnetic field due to the external sources is expressed as a truncated expansion of the spherical harmonics and both the currents in the conductors and the expansion coefficients are determined by applying the least square method. To overcome the ill-posedness of the problem, the functional to be minimized is augmented by a Tikhonov regularization term that penalizes unphysical solutions introduced by the expansion coefficients.

 

Finally, the problem of selecting a limited number of optimal sensor positions among a set of predetermined sensor positions is considered. Using the relaxation method, this optimization problem is changed to a convex optimization problem which can be readily solved using the CVX package.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. p. 35
Series
TRITA-EE, ISSN 1653-5146 ; 2016:196
National Category
Engineering and Technology
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-199635 (URN)978-91-7729-240-1 (ISBN)
Presentation
2017-01-26, V3, Teknikringen 72, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170116

Available from: 2017-01-16 Created: 2017-01-11 Last updated: 2017-01-16Bibliographically approved

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