THE FEATURES OF MAGNETIC FLUX DISTRIBUTION OF THE IDLING MODE OF THE POWER TRANSFORMERS
DOI:
https://doi.org/10.15588/1607-6761-2016-2-1Keywords:
the mathematical model, the magnetic field, the magnetic vector potential, finite element method, idling, three-phase power transformer, harmonic structure, magnetic flux, active and reactive powerAbstract
Purpose. The development of a new implementation of mathematical modeling in the FEMM tools structure to time
variable processes of electromagnetic energy transformation in power distribution transformers and determination of
idle parameters in view of nonlinear magnetic properties of electrical steels and features design of three phase magnetic
systems to provide the accuracy increase of the magnetic flux distribution and idle parameters.
Research methods. Numerical modeling of the conjugate electric and magnetic fields in the three-phase power transformer by finite element method and theory of electromagnetic field.
The obtained results. The theoretical research and modeling of the conjugate electric and magnetic processes on the basis of realization by numerical finite element method of the generalized two-dimensional models of the three-phase power transformer are proposed. The nonlinearity of the magnetic properties of electrical steel and the change of the phase angles of the currents in the phase windings at idle are taken into account. The distribution and form of the time dependences of the magnetic fluxes in the magnetic system of the three-phase power transformer are analyzed. The harmonic components of the time dependences of the magnetic fluxes in the cores, the yokes, the magnetic system corners and related non-sinusoidal coefficients are defined. The correction of the distribution of the magnetic flux values in the corners and calculations of the three-phase systems active and reactive power are made. The calculation accuracy of parameters of three-phase distribution transformer idling is increased.
Scientific novelty. The technique for the analysis of distribution and form of the time dependences of the magnetic fluxes in the magnetic system of the three-phase power transformer are presented, the non-linear magnetic properties of electrical steel and the change of the phase angles of the currents in the phase windings at idle are taken into account. The harmonic components of the time dependences of the magnetic fluxes and related non-sinusoidal coefficients are defined, their differences in the cores, the yokes, the magnetic system corners are set.
Practical significance. The method of correction for the distribution of the magnetic flux value in the corners and calculations of the three-phase systems active and reactive power are proposed. The calculation accuracy of parameters of three-phase distribution transformer idling (relative error is to 5%) at the design stage is increased.
References
Metodyka obchyslennia platy za peretikannia reaktyvnoi elektroenerhii mizh elektroperedavalnoiu orhanizatsiieiu ta yii spozhyvachamy. Zatverdzhena Nakazom Ministerstva palyva ta enerhetyky Ukrainy 17 sichnia 2002 r. № 19, zareiestrovana v Ministerstvi yustytsii Ukrainy 1 liutoho 2002 r. za № 93/6381, http://zakon4.rada.gov.ua/laws/show/z0093-02.
Tihomirov P. M. Raschet transformatorov. Moscow, Energoatomizdat, 1986, 528 р.
Vaskovskyi Iu. M. Polovyi analiz elektrychnykh mashyn. Kiev, NTUU «KPI», 2007, 192 р.
Baida E. Y. Raschet elektromahnytnykh y teplovykh polei s pomoshchiu prohrammy FEMM. Kharkov NTU KhPI, 2015, 94 р.
Milyih V. I., Polyakova N. V. Analiz garmonicheskogo sostava peremennogo magnitnogo polya, svyazannogo s vraschayuschimsya rotorom turbogeneratora, v rezhimah holostogo hoda i korotkogo zamyikaniya, Elektrotekhnika ta elektroenerhetyka, 2013, No 2, рр. 5–13.
Bul O. B. Metodyi rascheta magnitnyih sistem elektricheskih appatatov. Moscow, Akademiya, 2005, 337 р.
Yarymbash, D., Kilimnik, I., & Yarymbash, S. (2015). The dynamic adaptation of circuit models of short-circuit. Electrical Engineering And Power Engineering, 2, 65-70.
Yarymbash, D. (2005). Measuring features of AC current at graphitization furnaces electrical pathway. Electrical Engineering And Power Engineering, 1, 74–76.
Yarymbash, D., Yarymbash, S., Divchuk, T., & Kylymnik, I. (2016). Determination features of the power transformer short circuit parameters through field modeling. Electrical Engineering And Power Engineering, 1, 12-17.
Downloads
How to Cite
Issue
Section
License
Copyright (c) 2017 D. S. Yarymbash, S. T Yarymbash, T. E. Divchuk, I. M. Kylymnik
This work is licensed under a Creative Commons Attribution 4.0 International License.
Creative Commons Licensing Notifications in the Copyright Notices
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under aCreative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.
