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    Wyświetlanie 1-6 z 6
    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
    Artykuł
    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
    Artykuł
    Tytuł:
    Evaluation of the Technical Condition of the Active Part of the High Power Transformer Based on Measurements and Analysis of Vibroacoustic Signals
    Autorzy:
    Borucki, S.
    Cichoń, A.
    Majchrzak, H.
    Zmarzły, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/176397.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vibration
    vibroacoustic method
    core
    power transformer
    transformer diagnostics
    Opis:
    This article presents the results of research connected with the development and industrial use of vibroacoustic methods for the evaluation of the technical condition of the active part of transformers. The article presents the results of the analysis of vibrations generated by the high power transformer in which a defect was found on the basis of tests of oil carried out using the chromatography tests. In order to confirm the damage of the active part of this transformer, vibroacoustic measurements were performed in three states of its operation. The measurement using the classical vibroacoustic method included the registration of vibrations at the idle speed and during the load operation of the transformer. The original diagnostic method, so-called the modified vibroacoustic method, was also used during the measurement. The analysis of signals recorded using the classical vibroacoustic method was carried out in the frequency domain by indicating the amplitude of even harmonic vibrations. However, the analysis of signals measured during the commissioning of the transformer was conducted in the time-frequency domain using the short-time Fourier transform (STFT), continuous wavelet transform (CWT), and discrete wavelet transform (DWT). On the basis of the analysis of the results obtained it was stated that the increased level of vibrations of this transformer is a consequence of the loss of rigidity of the mechanical structure of its core.
    Źródło:
    Archives of Acoustics; 2017, 42, 2; 313-320
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Analiza porównawcza wyników badań w zakresie oceny stopnia zużycia styków PPZ metodą akustyczną i oscylograficzną
    Comparison analysis of research results on determining level of OLTC contact deterioration using acoustic and oscillographic methods of diagnostics
    Autorzy:
    Cichoń, A.
    Bergber, P.
    Borucki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/152504.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    podobciążeniowe przełączniki zaczepów (PPZ)
    diagnostyka transformatorów elektroenergetycznych
    metoda emisji akustycznej
    on load tap changer (OLTC)
    electric power transformer diagnostics
    acoustic emission method
    Opis:
    W artykule przedstawiono wyniki prac naukowo – badawczych związanych z diagnostyką podobciążeniowych przełączników zaczepów (PPZ). Badania wykonano w warunkach laboratoryjnych z wykorzystaniem modelu fizycznego PPZ typu VEL 110, umieszczonego w kadzi wypełnionej olejem izolacyjnym. Sygnały emisji akustycznej rejestrowano szerokopasmowym przetwornikiem piezoelektrycznym przymocowanym do zewnętrznej części kadzi. Zarejestrowane sygnały poddano analizie w dziedzinie czasowej. Wyniki pomiarów metodą oscylograficzną przedstawiono w postaci przebiegów prądowych i wyznaczając wartości czasów własnych. Na podstawie uzyskanych wyników przeprowadzono analizę porównawczą wyników uzyskanych za pomocą obu metod pomiarowych.
    This paper presents results of scientific research on diagnostic methods for on load tap changers (OLTC). Measurements were made in laboratory conditions with use of a physical model of the VEL 110 OLTC placed in a tank filled with insulating oil. Acoustic emission signals were recorded with use of a R15α wide band piezoelectric transducer which was fixed to the tank of the model. These signals were analyzed in the time domain, which resulted in calculation of the signal envelope and its characteristic times. The results of the oscillographic measurements are presented in the form of current diagrams and the calculated OLTC characteristic times. Basing on the obtained results of the oscillographic and acoustic measurements, a comparison analysis of both diagnostic methods was performed. The research data presented in this paper proves that detection of OLTC contact deterioration is possible by using both oscillographic and acoustic methods of diagnostics.
    Źródło:
    Pomiary Automatyka Kontrola; 2013, R. 59, nr 2, 2; 152-155
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Praktyczny przykład skutecznej detekcji i lokalizacji wyładowań niezupełnych metodą emisji akustycznej w transformatorze elektroenergetycznym
    Practical example of effective detection and location of partial discharges by the acoustic emission method in an electric power transformer
    Autorzy:
    Skubis, J.
    Cichoń, A.
    Borucki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/155763.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wyładowania niezupełne
    metoda emisji akustycznej
    diagnostyka
    transformator elektroenergetyczny
    partial discharges
    acoustic emission method
    diagnostics
    power transformer
    Opis:
    W artykule przedstawiono przykład diagnostyki transformatora elektro-energetycznego pod kątem oceny stanu technicznego papierowo - olejowego układu izolacyjnego zagrożonego występowaniem wyładowań niezupełnych (WNZ). Badania przeprowadzono podczas normalnej pracy jednostki transformatorowej, rejestrując w 36 punktach na powierzchni kadzi sygnały emisji akustycznej (EA) pochodzącej od zjawisk fizycznych występujących wewnątrz transformatora. Zarejestrowane sygnały poddano analizie w dziedzinie czasowej, częstotliwościowej i czasowo - częstotliwościowej. Wynikiem badań była detekcja i lokalizacja miejsca występowania wyładowań elektrycznych oraz wskazanie prawdopodobnej przyczyny i miejsca ich powstawania.
    Three measurement methods: gas chromatography method (DGA), electrical method and AE method are used in the assessment of the technical condition of paper-oil insulation of high-power transformers exposed to the occurrence of partial discharges (PDs). The acoustic method of PD detection is used as a supplementary one to the two others, mainly the gas chromatography method which does not make it possible to locate the place of the insulation system defect appearance. The basic advantage of the AE method, compared with the electrical one, is the possibility of its application during regular operation of power appliances [2, 3]. The paper presents the measurement results of the AE signals accompanying regular operation of a power transformer of 270 MVA. In order to assess the intensity of the AE signals measured on the object under study, coming from physical phenomena taking place inside a tub, three analyses were performed: in the time, frequency and time-frequency domains. Registration of the AE signals, the distributions of which is shown in Fig. 2, was carried out at 36 measurement points. An exemplary waveform of the AE signals registered is shown in Fig. 3, while the results of the analysis in the time domain are listed in Tables 1 and 2. In order to assess the waveforms registered more accurately, the analysis in the frequency domain was carried out and amplitude spectra were determined, an example of which is presented in Fig. 4. The time-frequency analysis was performed by using a short-time Fourier transform (STFT) determining two-dimensional spectrograms of the power density spectrum (Fig. 5). The assessment of the technical condition of the transformer under study made it possible to detect and locate areas in which PDs occurred. Damage of magnetic screens is a probable cause of their occurrence.
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 1, 1; 30-33
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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