Determination of the electromagnetic forces caused by short-circuit currents

Gutten, Miroslav; Janura, Richard; Jurcik, Jozef

doi:10.1109/rtucon.2015.7343179

Cited by 3 publications

(2 citation statements)

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“…Lorentz kuvveti olarak da bilinen sargı kuvvetlerinin temel nedeni kaçak akı alanı olarak adlandırılan elektrik ve manyetik alanlar arasındaki etkileşimlerdir [22,27]. Bu elektromanyetik kuvvet (F), akım şiddeti (J) ile akı yoğunluğunun (B) vektörel çarpımı olarak Eşitlik 3.1' deki gibi ifade edilmektedir [24].…”

Section: 2lorentz Kuvveti (Lorentz Forces)unclassified

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Doğrusal Olmayan Yük Koşullarında Çalışan Kuru Tip Transformatörlerin Titreşim Etkileri Üzerine Bir Analiz

Battal¹,

Sefa²,

Balci³

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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The use of non-linear loads in transformers leads to increased losses, heat and more vibration and noise are generated. Vibrations should be investigated because they cause to decrease the nominal values of the transformer and its service life. Figure A shows the variation of core vibration with respect to these harmonic components with current harmonic components of linear load, 3-phase and 1-phase rectifier, respectively. Figure A. Signals obtained according to load condition a) current harmonic spectrum, b) axial acceleration harmonic spectrum Purpose: It is aimed to investigate the vibration signals of a dry type isolation transformer core which operates different load conditions. Theory and Methods: Transformer and loads are modelled and simulated by using ANSYS Maxwell and Simplorer. And then core forces obtained from Maxwell are used as input parameters in ANSYS Mechanical. Finally, vibration signals as harmonic responses are obtained. Results: Increase in the THD value leads to an increase in the number and amplitude of vibration harmonic components. With the increase in the THD value, the second and third harmonic components of the vibration have increased in amplitude. It has been shown that the increase of the THD value caused by using the 1-phase rectifier leads to only the increase of the peak value amplitude in the radial force frequency spectrum, there is no similar increase in the axial force frequency spectrum. Conclusion: The increase of the THD value, the fundamental components of the vibration signals in the axial direction the second and third harmonic component amplitudes are increased. Also, the increase in THD value has led to a greater number of regional maximum points depending on the grades of the harmonic currents in the vibration frequency spectrum. Vibration signals must be carefully monitored since vibrations in the axial direction may cause a failure such as core deformation on the transformer.

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Section: 2lorentz Kuvveti (Lorentz Forces)unclassified

“…Sargı kuvvetleri genel olarak radyal ve eksenel olmak üzere iki bileşen halinde incelenmektedir [27][28].…”

Section: şEkil 3 Manyetik Akı Yoğunluğu Akım şIddeti Ve Oluşan Kuvvetin Bir Iletkendeki Yönü [28]unclassified