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Title
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Magnetostrictive vibrations model of a three-phase transformer core and the contribution of the fifth harmonic in the grid voltage
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Journal of applied physics / American Institute of Physics. - New York, N.Y., 1937, currens
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Publication
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New York, N.Y.
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American Institute of Physics
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2014
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ISSN
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0021-8979
[print]
1089-7550
[online]
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DOI
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10.1063/1.4863931
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Volume/pages
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115
:17
(2014)
, 3 p.
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Article Reference
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17A316
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ISI
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000335643700017
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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