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Wyszukujesz frazę "Ranachowski, Zbigniew" wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Application of acoustic emission to the analysis of phase transformations in 27MnCrB5-2 steel tests during continuous cooling
    Autorzy:
    Trafarski, Andrzej
    Łazarska, Małgorzata
    Ranachowski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2090676.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    phase transformation
    ultrasonics
    acoustic emission
    continuous cooling
    mikrostruktura
    transformacja fazowa
    ultradźwięki
    emisja akustyczna
    chłodzenie ciągłe
    Opis:
    The goal of the research was to analyze the acoustic emission signal recorded during heat treatment. On a special stand, samples prepared from 27MnCrB5-2 steel were tested. The steel samples were heated to 950°C and then cooled continuously in the air. Signals from phase changes occurring during cooling were recorded using the system for registering acoustic emission. As a result of the changes, Widmanstätten ferrite and bainite structures were observed under a scanning microscope. The recorded acoustic emission signal was analyzed and assigned to the appropriate phase transformation with the use of artificial neural networks.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139389, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monitoring of Partial Discharges in Cable Insulation and Cable Head Using Acoustic Method
    Autorzy:
    Ranachowski, Zbigniew
    Wieczorek, Krzysztof
    Ranachowski, Przemysław
    Dębowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2141672.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    partial discharges
    medium voltage insulation
    acoustic emission
    Opis:
    The article presents the application of Acoustic Emission (AE) method for detection and registration of partial discharges (PD) generated in medium voltage (MV) cable isolation and MV cable head. The insulation of the high voltage cable is made of a flexible material whose properties are characterised by a high coefficient of attenuation of the acoustic signals. For this reason, the AE method has not been used so far to detect PD in energetic cables. The subjects of the research were the MV cable and the standard T-type cable head. The cable contained defects which were the source of partial discharges. In case of cable head the PD were provoked by thin grounded electrode which was introduced into connector opening. The results of AE measurements are presented in the form of spectrograms. Acoustic Emission was evoked when the applied voltage level reached the value of 7.5 kV for the cable and 4 kV for the cable head. The authors used the acoustic instrumentation of their own design intended for future field use. Obtaining successful results of partial discharges measurements using the acoustic method in the cable insulation makes an original contribution of the presented work.
    Źródło:
    Archives of Acoustics; 2022, 47, 2; 259-265
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradation Processes in Shield-Centring Elements of Surge Arresters
    Autorzy:
    Papliński, P.
    Śmietanka, H.
    Ranachowski, P.
    Ranachowski, Zbigniew
    Wieczorek, K.
    Kudela, S. jr.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203744.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surge arrester
    TSE glass textolite
    discharge current
    EDS method
    Opis:
    This paper presents the results of testing samples of shield-centering elements from medium-voltage surge arresters. The elements were made of TSE glass textolite. The elements have been dismantled from different operated surge arresters, which were subjected to discharge currents (short-circuit currents) of different intensity and duration. The discharge currents led to degradation of the tested elements with various degrees of advancement. The degradation was investigated using microscopic methods and energy-dispersive X-ray spectroscopy (EDS). Changes in the content of elements of the surface of textolite materials - as the degradation progresses - were documented. It was found that high discharge current flows resulted in melting of the organic binder, epoxy resin, especially its surface layer. Partial charring and even burning of the resin was noticeable. Furthermore, it was found that with increasing degradation on the surface of the TSE laminate, the carbon and oxygen content, which are part of the organic resin, decreases. Simultaneously the amount of silicon, calcium and aluminium, which are present in the glass fibres, increases. The charring effect of the resin and the formation of conductive paths result in a decrease in the performance of surge arresters and their subsequent failure.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 237--242
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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