Analysis of Excitation Current in DC-Biased Transformer by Wavelet Transform

• Autorzy: Zhou X. , Zhou Z. , Ma Y. , Wu D.

Warianty tytułu

PL

Wykorzystanie transformaty falkowej do analizy prądu magnesującego transformatora podmagnesowanego składową DC

• Języki publikacji: EN

Abstrakty

EN

To analyze the excitation current in DC-Biased Transformer in depth, the thesis deduces the mathematical expression of distortion excitation current, and put forwards the analysis method with wavelet transform principle, which directs at analyzing the boundedness of distortion excitation current using the Fourier Transform. Through sampling the distortion excitation current signal, we resolve its wavelet LF approximation signal and HF detail signal, conclude DC component size of the distortion excitation current, confirm the moment of excitation current waveform distorting, comparatively analyze the results after Fourier Transform, and make clear that the principle is feasibility and superiority. Through analyzing the energy spectrogram in the signal high-frequency band of distortion excitation current and short circuit current are determined. Simulation results show that energy changes in the high frequency band among the different scale. In practice, DC bias can lead to the action of relay protection device, which does harm to the system potentially.

PL

Przedstawiono metodę analizy składowej stałej podmagnesowującej w prądzie magnesującym transformatora. Do analizy wykorzystuje się transformatę falkową I transformatę Fouriera prądu magnesującego.

Słowa kluczowe

EN

transformer; DC magnetic bias; wavelet transform

PL

transformator; transformata falkowa

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2012
• Tom: R. 88, nr 5b
• Strony: 108--112
• Opis fizyczny: Bibliogr. 18 poz., schem.

Twórcy

autor

Zhou X.

autor

Zhou Z.

autor

Ma Y.

autor

Wu D.

• Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems

Bibliografia

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