التفاصيل البيبلوغرافية
| العنوان: |
Mathematical Model of a Nonlinear Power Transformer for Needs of Relay Protection. |
| المؤلفون: |
Kolesnikov, Evgeniy, Novozhilov, Aleksandr, Rakhimberdinova, Dilara, Kislov, Aleksandr, Novozhilov, Timofey |
| المصدر: |
Energies (19961073); Apr2024, Vol. 17 Issue 7, p1710, 15p |
| مصطلحات موضوعية: |
POWER transformers, CURRENT transformers (Instrument transformer), MATHEMATICAL models, MUTUAL inductance, MAGNETIC flux, ELECTRIC relays, SPECTRUM analyzers |
| مستخلص: |
In this work, a mathematical model of a three-phase nonlinear transformer is suggested. The model enables simulating the transformer operation with allowance for its nonlinearity and covers needs of the relay protection. Our model has been developed on the basis of a mathematical model with phase coordinates, where differential equations are composed by the Kirchhoff's phase-voltage law. Based on this model, we first compose a mathematical model for simulating steady-state operation modes of a transformer, taking into account the asymmetry and nonlinearity of its ferromagnetic core. In this model, the initial values of inductances and mutual inductances of loops are determined from the main phase inductance calculated by the experimentally found no-load current, and their current values are determined from the currents in windings and the magnetic fluxes in legs of the transformer core. The magnetic fluxes are calculated by the nodal-pair method. This improved mathematical model is verified through a comparison between the calculated harmonic components of the phase currents and the experimental results. The harmonic components are calculated with the use of Fourier expansion of the calculated phase currents. Their experimental values are determined with a spectrum analyzer. The calculated and experimental harmonic components of the currents of phase A during no-load and rated-load operation of the transformer are tabulated. The comparison of these results shows that the mathematical model of a three-phase transformer we suggest makes it possible to simulate currents in transformer windings under steady-state operation modes with accuracy acceptable for relay protection. [ABSTRACT FROM AUTHOR] |
|
Copyright of Energies (19961073) is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
Full Text Finder