Wszystkie pola: acoustic properties - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Properties of Acoustic Emission Signals Coming from Partial Discharges Caused by Modeled Sources Immersed in Transformer Oil
Autorzy:: Witos, F.
Gacek, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1807759.pdf
Data publikacji:: 2009-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.40.Le
52.80.-s
77.22.Jp
84.70.+p
Opis:: Investigation results concerning acoustic emission signals coming from partial discharges generated by modeled sources are presented in the paper. These sources have been made using different bushing ends (without any extra elements and with a thread or a pike) situated directly in the oil, but without screens typical for partial discharge investigations in a bushing. Measurements have been carried out using own measuring acoustic emission system DEMA-COMP and - in a parallel way - computer-aided partial discharges measuring system TE 571 (produced by the firm Haefely Trench). Fundamental and advanced analysis of acoustic emission signals has been made. These signals were recorded in 20 measuring situations which need to multiple installation of acoustic emission sensors. Conclusions resultant from own originate advanced analysis of signals content description of properties revealed by defined acoustic emission descriptors.
Źródło:: Acta Physica Polonica A; 2009, 116, 3; 422-427
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Analysis of Properties Characteristic for Acoustic Emission Signals Recorded On-Line in Power Oil Transformers
Autorzy:: Witos, F.
Olszewska, A.
Szerszeń, G.
Powiązania:: https://bibliotekanauki.pl/articles/1493277.pdf
Data publikacji:: 2011-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 52.80.-s
77.22.Jp
84.70.+p
43.40.Le
43.60.Lq
Opis:: Investigation results of properties characteristic for acoustic emission signals recorded in two selected power oil transformers are presented. Signals were put to the filtration, whereas components coming from partial discharges have been left. The calculations concerned: phase-time characteristics, averaging phase characteristics, averaging short time Fourier transform spectrograms, amplitude distributions of signals, values of acoustic emission descriptor with acronym ADC. On the ground of calculated basic characteristics and maps of ADC descriptor three areas have been selected on lateral walls of transformer tanks. Acoustic emission signals recorded in these areas were analyzed from the point of view how is influence of propagation path on these properties.
Źródło:: Acta Physica Polonica A; 2011, 120, 4; 759-762
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Analysis of Properties of Chosen Acoustic Emission Descriptors Describing Acoustic Signals Measured by Means of Acoustic Emission Method within Oil Transformers
Autorzy:: Witos, F.
Olszewska, A.
Powiązania:: https://bibliotekanauki.pl/articles/1506870.pdf
Data publikacji:: 2010-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 52.80.-s
77.22.Jp
84.70.+p
Opis:: Authors of the paper present investigation results concerning properties of ADP, ADC and ADNC descriptors which have been obtained during measurements made within three oil transformers and then tested also by other methods (electric and dissolved gas analysis ones). Methodology which makes easier an analysis and identification of acoustic emission signals generated by partial discharges is presented. Results obtained by acoustic emission method have been referred to results coming from other measuring methods.
Źródło:: Acta Physica Polonica A; 2010, 118, 6; 1267-1271
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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