First-order perturbation approach to transformer winding deformations
2013 (English)In: Progress In Electromagnetics Research Letters, ISSN 1937-6480, Vol. 43, 1-14 p.Article in journal (Refereed) Published
An on-line method to detect radial mechanical deformations of power transformer winding turns is presented. First-order perturbation theory is applied to a transformer winding surrounded by the transformer tank wall and the iron core. The transformer wind- ing is modeled as thin conducting cylindrical rings (winding segments or turns) situated within a coaxial waveguide, where the outer con- ducting cylinder represents the transformer tank wall while the inner conducting cylinder represents the iron core. Antennas which radi- ate and measure microwave fields are proposed inside the transformer tank in order to identify and quantify the mechanical deformations of winding turns. The direct propagation problem is solved using conventional waveguide theory with mode-matching and cascading techniques. An optimization algorithm is then used to solve the inverse problem whereby a good agreement between the reconstructed and true deformations of the winding segments is obtained.
Place, publisher, year, edition, pages
2013. Vol. 43, 1-14 p.
Cascading technique, Coaxial waveguides, Conducting cylinder, First-order perturbation theory, Mechanical deformation, Optimization algorithms, Perturbation approach, Transformer winding deformations
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-133247ScopusID: 2-s2.0-84884567532OAI: oai:DiVA.org:kth-133247DiVA: diva2:660333
QC 201310292013-10-292013-10-292016-01-19Bibliographically approved