Identification of Acoustic Emission Signals Originating from the Core Magnetization of Power Oil Transformer

• Autorzy: Olszewska A. , Witos F.

Identyfikatory

DOI

10.1515/aoa-2016-0077

• Języki publikacji: EN

Abstrakty

EN

In this paper, the properties of AE signals originating from phenomena occurring during magnetization of ferromagnetic materials which are used to construct power transformer cores are presented. The AE signals in a selected power oil transformer were recorded and analyzed. The analysis included, i.e., time, frequency, and time-frequency analyses, calculations of amplitude distributions of the signals and defined AE descriptors, determination of the descriptor map on the side walls of transformers, as well as a detailed analysis of selected part of the signals. The maps of descriptors were analyzed in the frequency bands of 20–70 kHz, 70–100 kHz, and 100–200 kHz. The analysis of the properties of the signals was performed in time and frequency domains. Based on the analysis, there were identified the AE signals originating from the phenomena occurring during the core magnetization of a power oil transformer. To identify those phenomena, the maps of the ADC descriptor calculated in the band of 20–70 kHz when selecting the measurement points in which there were no AE sources from partial discharges were used. An analysis of magnetoacoustic emission signals in the bands of 70–100 kHz and 100–200 kHz was also performed. The analysis of the signal properties in such an extended frequency range allowed determining the properties of the magnetoacoustic signals coming from core sheets of power oil transformers.

Słowa kluczowe

EN

power oil transformers; magnetization of transformers cores; magnetoacoustic emission

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2016
• Tom: Vol. 41, No. 4
• Strony: 799--812
• Opis fizyczny: Bibliogr. 13 poz., fot., tab., wykr.

Twórcy

autor

Olszewska A.

• Department of Optoelectronics, Faculty of Electrical Engineering, Silesian University of Technology, Krzywoustego 2, 44-100 Gliwice, Poland

autor

Witos F.

• Department of Optoelectronics, Faculty of Electrical Engineering, Silesian University of Technology, Krzywoustego 2, 44-100 Gliwice, Poland

Bibliografia

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• 3. Deheng Z., Kexiong T., Xianche J. (1988), The study of AE method for detection of PD in power transformers, II Conf. Properties and Application of Dielectric Materials, 614–617.
• 4. Edwards C., Palmer S. B. (1987), The effect of stress and sample shape on the magnitude and frequency of magnetomechanical acoustic emission, The Journal of the Acoustical Society of America, 82, 2, 534–544.
• 5. Guyot M., Cagan V. (1993), The magneto-acoustic emission, J. Appl. Phys., 73, 10, 5348–5353.
• 6. Howells E., Norton E. T. (1978), Detection of Partial Discharges in Transformers Using Acoustic Emission Techniques, IEEE Trans. on Power Apparat. And Systems, PAS-97, 5, 1538–1549.
• 7. Lord A. E. (1975), Physical Acoustics: Principles and Methods, Academic Press.
• 8. Piotrowski L., Augustyniak B., Chmielewski M. (2012), Recent development in material state evaluation with the use of magnetoacoustic emission effect measurements [in Polish: Stan rozwoju metody diagnozowania materiałów z wykorzystaniem efektu emisji magnetoakustycznej], Przegląd Spawalnictwa, 13, 24–30.
• 9. Witos F., Gacek Z., Opilski A. (2002), The new AE descriptor for modeled sources of PDs, Archives of Acoustic, 27, 1, 65–77.
• 10. Witos F. (2008), Investigation of partial discharges by means of acoustic emission method and electric method [in Polish: Badania wyładowań niezupełnych metodą emisji akustycznej i metodą elektryczną], Wydawnictwo Politechniki Śląskiej, Gliwice.
• 11. Witos F., Olszewska A. (2012), The system useful for analysis of acoustic emission signals generated by partial discharges within power oil transformers insulation [in Polish: System do analizy sygnałów emisji akustycznej generowanych przez wyładowania niezupełne w izolacji transformatorów elektroenergetycznych], Przegląd Elektrotechniczny, 88, 11B, 154–157.
• 12. Olszewska A., Witos F. (2012), Location of partial discharge sources and analysis of signals in chosen power oil transformers by means of acoustic emission method, Acta Physica Polonica A, 122, 1, 921–926.
• 13. Witos F., Gacek Z. (2013), Testing of partial discharges and location of their sources in generator coil bars by means of acoustic emission and electric methods, [in:] Acoustic emission – research and applications, W. Sikorski [Ed.], pp. 117–145, InTech, Rijeka.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.