Influence of the magnetization direction on power losses in transformer steel sheets

• Autorzy: Szczurek P. , Mazgaj W. , Banach A.

Identyfikatory

DOI

10.4467/2353737XCT.16.271.6070

Warianty tytułu

PL

Wpływ kierunku magnesowania na straty mocy w blachach transformatorowych

• Języki publikacji: EN

Abstrakty

EN

Calculation of power losses in transformer steel sheets is still a significant problem. In some places of cores of a three-phase transformer the flux density is not parallel to the rolling direction; it especially refers to the so-called T-points of the transformer cores. In these places magnetization curves differ from the curve measured for the rolling direction. The paper deals with hysteresis losses, eddy current and excess losses and their dependences on the direction of magnetization processes. Analysis is performed for several frequencies of the magnetization process. Measured power losses of the selected transformer steel sheets are compared with results obtained on the basis of the analytical formulas.

PL

Wyznaczanie strat mocy blach transformatorowych jest nadal istotnym problemem. W pewnych obszarach rdzenia transformatorów trójfazowych linie pola magnetycznego nie są równoległe do kierunku walcowania; szczególnie odnosi się to do tak zwanych T-punktów rdzeni transformatorów. W tych obszarach charakterystyki namagnesowania różnią się od charakterystyki wyznaczonej do kierunku walcowania. Artykuł dotyczy strat histerezowych i wiroprądowych oraz ich zależność od kierunku procesu magnesowania. Analizę przeprowadzono dla kilku częstotliwości procesu magnesowania. Zmierzone straty mocy wybranych blach transformatorowych porównano z wynikami uzyskanymi na podstawie wzorów analitycznych.

Słowa kluczowe

EN

eddy current losses; excess losses; hysteresis losses; transformer sheet

PL

blachy transformatorowe; straty histerezowe; straty wiroprądowe

• Wydawca: Wydawnictwo Politechniki Krakowskiej im. Tadeusza Kościuszki
• Czasopismo: Czasopismo Techniczne. Elektrotechnika
• Rocznik: 2016
• Tom: Y. 113, iss. 3-E
• Strony: 127--138
• Opis fizyczny: Bibliogr. 20 poz., wz., wykr., tab.

Twórcy

autor

Szczurek P.

• Laboratory of Magnetic Measurements, Stalprodukt SA Bochnia

autor

Mazgaj W.

• Institute of Electromechanical Energy Conversion, Faculty of Electrical and Computer Engineering, Cracow University of Technology

autor

Banach A.

• Institute of Electromechanical Energy Conversion, Faculty of Electrical and Computer Engineering, Cracow University of Technology

Bibliografia

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Uwagi

The research presented in this paper was funded by subsidies on science granted by Polish Ministry of Science and Higher Education under the theme No. E-2/619/2016/DS 144 “Modelling of magnetization processes in magnetic circuits of electrical machines and devices for diagnostics and loss estimation”.