Title
Magnetostrictive vibrations model of a three-phase transformer core and the contribution of the fifth harmonic in the grid voltage Magnetostrictive vibrations model of a three-phase transformer core and the contribution of the fifth harmonic in the grid voltage
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. :American Institute of Physics ,
Subject
Physics
Source (journal)
Journal of applied physics / American Institute of Physics. - New York, N.Y., 1937, currens
Volume/pages
115(2014) :17 , 3 p.
ISSN
0021-8979
1089-7550
0021-8979
Article Reference
17A316
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The effect of the fifth harmonic in the grid voltage (with fundamental frequency of 50Hz) on the vibrations of a three-phase transformer core is computed, since such harmonic has the largest contribution in the European grid voltage. The computational method is a two-dimensional (2D) finite element technique. The modal vibrations under various magnetisations (viz with different fifth harmonic components) are compared with those obtained under a purely sinusoidal magnetisation and showed that the variations for the 100Hz harmonic of the vibrations are small. However, the 200Hz harmonic showed a significant increase when a fifth harmonic was present on the applied voltage. In fact, the presence of a fundamental component with 50Hz frequency and a fifth harmonic on the magnetisation signal generates a 200Hz harmonic on the magnetostriction strains (and the magnetic forces), and thus this harmonic increases significantly. (C) 2014 AIP Publishing LLC.
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