Temat: partial discharge - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of the Acoustic Emission Method for Diagnosis of On-Load Tap Changer
Autorzy:: Majchrzak, H.
Cichoń, A.
Borucki, S.
Powiązania:: https://bibliotekanauki.pl/articles/176624.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: acoustic emission
partial discharge
transformer diagnostics
Opis:: This paper provides an example of the application of the acoustic emission (AE) method for the diagnosis of technical conditions of a three-phase on-load tap-changer (OLTC) GIII type. The measurements were performed for an amount of 10 items of OLTCs, installed in power transformers with a capacity of 250 MVA. The study was conducted in two different OLTC operating conditions during the tapping process: under load and free running conditions. The analysis of the measurement results was made in both time domain and time-frequency domain. The description of the AE signals generated by the OLTC in the time domain was performed using the analysis of waveforms and determined characteristic times. Within the time-frequency domain the measured signals were described by short-time Fourier transform spectrograms.
Źródło:: Archives of Acoustics; 2017, 42, 1; 29-35
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Study on Descriptors of Acoustic Emission Signals Generated by Partial Discharges under Laboratory Conditions and in On-Site Electrical Power Transformer
Autorzy:: Kunicki, M.
Cichoń, A.
Borucki, S.
Powiązania:: https://bibliotekanauki.pl/articles/176881.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: acoustic emission
partial discharge
transformer diagnostics
Opis:: An acoustic emission method (AE) is widespread and often applied for partial discharge (PD) diagnostics, mainly due to its ease of application as well as noninvasiveness and relatively high sensitivity. This paper presents comparative analysis of AE signals measurement results archived under laboratory conditions as well as on-site actual AE signals generated by inside PDs in electrical power transformer during its normal service. Three different PD model sources are applied for laboratory research: point to point, multipoint to plate and surface type. A typical measuring set up commonly used for on-site transformer PD diagnostics is provided for the laboratory tasks: piezoelectric joint transducer, preamplifier, amplifier and measuring PC interface. During the on-site research there are three measuring tracks applied simultaneously. Time domain, time-frequency domain and statistical tools are used for registered AE signals analysis. A number of descriptors are proposed as a result of the analysis. In the paper, attempt of AE signals descriptors, archived under laboratory condition application possibilities for on-site PD diagnostics of power transformers during normal service is made.
Źródło:: Archives of Acoustics; 2016, 41, 2; 265-276
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Application of a Phase Resolved Partial Discharge Pattern Analysis for Acoustic Emission Method in High Voltage Insulation Systems Diagnostics
Autorzy:: Kunicki, M.
Cichoń, A.
Powiązania:: https://bibliotekanauki.pl/articles/177912.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: acoustic emission
partial discharge
transformer diagnostics
insulation system
Opis:: An alternative method for analysis of acoustic emission (AE) signals generated by partial discharges (PD), based on a correlation between voltage phase run and AE pulses, so called phase resolved PD pattern (PRPD), is presented in the paper. PRPD pattern is a well-known analysis tool commonly used in such PD diagnostic methods as conventional electrical and UHF ones. Moreover, it yields various signal analysis abilities and allows a direct correlation indication between measurement results achieved using different methods. An original PRPD measurement methodology applied for AE method as well as some exemplary measurement results and further data analysis capabilities are presented in the paper. Also a comparative analysis of PRPD patterns achieved using various measurement methods and different PD source configurations have been investigated. All presented experiments were done under laboratory conditions using PD model sources immersed in the insulation oil. The main purpose of the presented research is to indicate an all-embracing analytical tool that yields an ability to direct comparison (qualitative as well as quantitative) of the AE measurement results with other commonly applied PD measurement methods. The presented results give a solid fundamental for further research work concerning a direct correlation method for AE and other described in the paper diagnostic techniques, mainly in order to continue PD phenomena analysis and assessment in real life high voltage apparatus insulation systems under normal onsite operation conditions.
Źródło:: Archives of Acoustics; 2018, 43, 2; 235-243
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Zastosowanie klasyfikatora neuronowego w systemie eksperckim oceny stanu układów izolacyjnych transformatorów elektroenergetycznych
The Application of a Neural Classifier in an Expert System for the Evaluation of the Condition of Power Transformer Insulation System
Autorzy:: Boczar, T.
Borucki, S.
Cichoń, A.
Powiązania:: https://bibliotekanauki.pl/articles/153524.pdf
Data publikacji:: 2007
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: wyładowania niezupełne
sieci neuronowe
system ekspercki
układ izolacyjny
transformator elektroenergetyczny
partial discharge
artificial neural network
expert's system
paper-oil insulation
power transformer
Opis:: Tematyka artykułu dotyczy oceny możliwości wykorzystania jednokierunkowej sieci neuronowej w systemie eksperckim diagnostyki stanu układów izolacyjnych transformatorów elektroenergetycznych. W artykule przedstawiono teoretyczne i praktyczne możliwości budowy systemu ekspertowego, bazującego na metodzie emisji akustycznej, wspomagającego diagnostykę układów izolacyjnych transformatorów dużej mocy. Zamieszczone w pracy wyniki przedstawiają skuteczność rozpoznawania badanych form WNZ (defektów izolacji), uzyskaną przy zastosowaniu klasyfikatora neuronowego, jak również ocenę możliwości jego zastosowania jako mechanizmu wnioskującego komputerowego systemu diagnostycznego.
The subject matter of the paper refers to the evaluation of the application possibilities of a single-direction neural network in the expert system of the diagnostics of the insulation system condition. The paper presents theoretical and practical possibilities of building an expert system based on the acoustic emission method, assisting the diagnostics of insulation systems of high power transformers. The results presented in this paper show the recognition effectiveness of the PD forms under study (insulation defects), obtained by using a neural classifier as well as the evaluation of its application possibilities as an inferring mechanism of a computer diagnostic system.
Źródło:: Pomiary Automatyka Kontrola; 2007, R. 53, nr 10, 10; 29-32
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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