Application of signal processing elements for the characteristics of acoustic emission pulses generated by partial discharges

• Autorzy: Boczar T. , Borucki S. , Cichoń A. , Lorenc M.
• Języki publikacji: EN

Abstrakty

EN

The subject matter of this paper refers to the issues connected with the application of modern numerical methods in processing and analysis of the signals measured by the acoustic emission method (AE) during high-power experiments carried out in laboratory conditions in the setups modelling basic partial discharge forms (PDs). The detailed cognitive aim of the research work was determining the possibilities and the application range of the short time Fourier transform (STFT) and wavelet transform in the analysis of the AE pulses generated by basic PD forms that can occur in oil insulation systems of such appliances as transformers, measuring transformers, bushing insulators, switchgears, and power condensers. The time – frequency analysis was carried out for the particular PDs from the point of view of determining differences and indicating common features for the frequency structures determined, for the positive and negative voltage polarizations separately. The research concentrated mainly on the following types of PDs: point-plane, multipoint-plane, multipoint-plane with a layer of pressboard, surface, generated in gas bubbles and on the indeterminate-potential particles moving in oil. In calculations using wavelet transformations basic types of analyzing functions, the so-called basic wavelets, were applied. When determining amplitude spectrograms of the AE pulses measured various types of observation windows were used. Moreover, for the approximation runs determined and for the particular details the autocorrelation functions (ACF) were calculated, and the probability density functions (PDF) were calculated to determine statistical properties. Also, frequency spectrum runs for the AE pulses measured and the diagrams corresponding with the details analyzed, which visualize the size of energy transferred at the particular decomposition levels, were determined. The paper presents the results of measurements and analyses of the AE pulses generated by the PDs in oil in the multipoint-plane with a layer of pressboard system.

Słowa kluczowe

EN

acoustic emission (AE); partial discharges (PDs); STFT (Short Time Fourier Transform); discrete wavelet transform (DWT); continuous wavelet transform (CWT)

• Wydawca: Silesian Division of Polish Acoustical Society
• Czasopismo: Molecular and Quantum Acoustics
• Rocznik: 2007
• Tom: Vol. 28
• Strony: 23--38
• Opis fizyczny: Bibliogr. 33 poz., rys.

Twórcy

autor

Boczar T.

autor

Borucki S.

autor

Cichoń A.

autor

Lorenc M.

• Technical University of Opole, Sosnkowskiego 31, 45-272 Opole, Poland,

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