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    Wyświetlanie 1-6 z 6
    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
    Artykuł
    Tytuł:
    Variability of the Acoustic Emission Signals Generated by Partial Discharges in Mineral Oil
    Autorzy:
    Kunicki, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/177772.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    partial discharge
    insulation system
    measurements
    signal processing
    Opis:
    The main purpose of the presented research is to investigate the partial discharge (PD) phenomenon variability under long-term AC voltage with particular consideration of the selected physical quantities changes while measured and registered by the acoustic emission method (AE). During the research a PD model source generating surface discharges is immersed in the brand new insulation mineral oil. Acoustic signals generated by the continuously occurred PDs within 168 hours are registered. Several qualitative and quantitative indicators are assigned to describe the PD variability in time. Furthermore, some longterm characteristics of the applied PD model source in mineral oil, are also presented according to acoustic signals emitted by the PD. Finally, various statistical tools are applied for the results analysis and presentation. Despite there are numerous contemporary research papers dealing with long-term PD analysis, such complementary and multiparametric approach has not been presented so far, regarding the presented research. According to the presented research from among all assigned indicators there are discriminated descriptors that could depend on PD long-term duration. On the grounds of the regression models analysis there are discovered trends that potentially allow to apply the results for modeling of the PD variability in time using the acoustic emission method. Subsequently such an approach may potentially support the development and extend the abilities of the diagnostic tools and maintenance policy in electrical power industry.
    Źródło:
    Archives of Acoustics; 2019, 44, 2; 339-348
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis on Acoustic Disturbance Signals Expected During Partial Discharge Measurements in Power Transformers
    Autorzy:
    Kunicki, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1953519.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    acoustic emission
    partial discharge
    insulation system
    measurements
    power transformers
    Opis:
    This paper presents comparative analysis of various acoustic signals expected during partial discharge (PD) measurements in operating power transformer. Main purpose of the paper is to yield relevant and reliable method to distinguish between various acoustic emission (AE) signals emitted by PD and other sources, with particular consideration of real-life results rather than laboratory simulations. Therefore, selected examples of real-life AE signals registered in seven different power transformers, under normal operation conditions, within few years are showed and analyzed. Five scenarios are investigated, which represent five types of AE sources: PD generated by artificial sources, and next four real-life sources (including PD in working transformer, oil flow, oil pumps and core). Several different signal processing methods are applied and compared in order to identify the PD signals. As a result, an energy patterns analysis based on the wavelet decomposition is found as the most reliable tool for identification of PD signals. The presented results may significantly support the process of interpretation of the PD measurement results, and may be used by field engineers as well as other researchers involved in PD analysis using AE method. Finally, observed properties also provide a solid basis for establishing or improving complete classification method based on the artificial intelligence algorithms.
    Źródło:
    Archives of Acoustics; 2020, 45, 4; 733-746
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The 8AE-PD computer measurement system for registration and analysis of acoustic emission signals generated by partial discharges in oil power transformers
    Autorzy:
    Witos, Franciszek
    Opilski, Zbigniew
    Szerszeń, Grzegorz
    Setkiewicz, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/220623.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission
    partial discharge
    multichannel system
    acoustic signal detection
    acoustic signal processing
    signal analysis
    voltage preamplifier
    Opis:
    A computer measurement system, designed and built by authors, dedicated to location and description of partial discharges (PD) in oil power transformers examined by means of the acoustic emission (AE) method is presented. The measurement system is equipped with 8 measurement channels and ensures: monitoring of signals, registration of data in real time within a band of 25-1000 kHz in laboratory and real conditions, basic and advanced analysis of recorded signals. The basic analysis carried out in the time, frequency and time-frequency domains deals with general properties of the AE signals coming from PDs. The advanced analysis, performed in the discrimination threshold domain, results in identification of signals coming from different acoustic sources as well as location of these sources in the examined transformers in terms of defined by authors descriptors and maps of these descriptors on the side walls of the tested transformer tank. Examples of typical results of laboratory tests carried out with the use of the built-in measurement system are presented.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 403-418
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calibration and Laboratory Testing of Computer Measuring System 8AE-PD Dedicated for Analysis of Acoustic Emission Signals Generated by Partial Discharges Within Oil Power Transformers
    Autorzy:
    Witos, F.
    Szerszeń, G.
    Opilski, Z.
    Setkiewicz, M.
    Olszewska, A.
    Duda, D.
    Maźniewski, K.
    Szadkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177029.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multichannel system
    calibration
    acoustic emission
    partial discharge
    power oil transformers
    Opis:
    In the paper, there are presented a general description of the constructed measuring system 8AE-PD, the results of calibration of this system by the Hsu-Nielsen method as well as the testing of the measuring system during recording signals generated by Hsu-Nielsen sources in a steel plate and a modeled partial discharge (PD) source. There is also presented the methodology of investigations by the calibrated acoustic emission method. The results of analyses of PD signals coming from the modeled sources are given. In particular, there are described the properties of acoustic emission (AE) signals generated by the PDs as well as the dependencies of the peak-to-peak voltage Umm, the RMS voltage Urms and the descriptors of acronyms ADP and ADC on the apparent charge Q introduced by the modeled PD source. There are determined the limit values of the apparent charge Q introduced by the modeled PD source for which the recorded signal is identified as originating from the PDS.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 297-311
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System ekspertowy oceny stanu układów izolacyjnych transformatorów elektroenergetycznych z wykorzystaniem metody emisji akustycznej
    Expert system for assessment of electric power transformer insulation systems using the acoustic emission method
    Autorzy:
    Boczar, T.
    Frącz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/152181.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    metoda emisji akustycznej
    wyładowania elektryczne
    wyładowania niezupełne
    system ekspercki
    wysokonapięciowe systemy izolacyjne
    acoustic emission method
    electrical discharge
    partial discharge
    expert system
    high-voltage insulation systems
    Opis:
    Tematyka niniejszego artykułu dotyczy doskonalenia praktycznych zastosowań metody emisji akustycznej (EA) w diagnostyce wysokonapięciowych układów izolacyjnych urządzeń elektroenergetycznych. W szczególności przedstawiono podstawowe założenia oraz opisano poszczególne elementy eksperckiego systemu diagnostycznego wykorzystującego metodę akustyczną do oceny stanu mierzonej izolacji transformatorów energetycznych, wykonywanej podczas ich normalnej pracy w warunkach przemysłowych.
    The subject matter of this paper refers to the development of practical applications of the acoustic emission (EA) method to diagnostics of high-voltage insulation systems of power appliances, carried out during their regular operation in industrial conditions. First of all, basic assumptions are presented and the particular elements of the expert diagnostic system using AE method for the assessment of the condition of the electric power transformer insulation measured are described. Fig. 1 shows its block diagram in which the following modules can be distinguished: a measuring system (Figs. 2 and 3), a processing - analysing system, a knowledge base and a classifier. These modules are characterised successively in Section 2 of the paper. Special attention is given to the description of the group of multiparametric descriptors (Fig. 4) characterising the AE signals in the time, frequency and time-frequency domains, including descriptive statistics indexes and correlative parameters. Accordant descriptors make it possible, under strictly defined metrological conditions, to recognize basic partial discharge forms (PDs) that may occur in paper-oil insulation. In this way a catalogued knowledge base containing the so-called 'fingerprints' was created for basic types of high-voltage defects of insulation systems. The scope of the research work carried out in the Institute of Power Engineering, connected with a practical implementation of the system suggested, is characterised in the last section of the paper.
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 2, 2; 104-107
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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