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    Wyświetlanie 1-3 z 3
    Tytuł:
    Microstructure and Degree of Degradation of ZnO Varistors in Surge Arresters Due to Operation
    Autorzy:
    Papliński, P.
    Wańkowicz, J.
    Ranachowski, P.
    Ranachowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/356415.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surge arrester
    MO varistor
    microstructure of ceramics
    ceramic material degradation
    Opis:
    The paper presents the test results for the microstructure of ZnO varistors comprising high voltage gapless surge arresters. The tests were performed on varistors produced in different periods and by various manufacturers. The research was inspired by different characteristics of changes in values of current flowing through surge arresters as a function of changes in values of system voltage in a 220 kV substation, and the temperature in a multi-year cycle. Furthermore, the effects of varistor microstructure degradation following a failure of an unsealed surge arrester were investigated. The results provided the grounds for assessment of ZnO varistor microstructure parameters in terms of their durability and resistance to degradation processes.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1267-1273
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Microstructure of ZnO Varistors Taken From Surge Arrester Counters
    Autorzy:
    Papliński, P.
    Wańkowicz, J.
    Ranachowski, P.
    Ranachowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/355223.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surge arrester counter
    ZnO varistors
    microstructure of ceramics
    ceramic material degradation
    Opis:
    The paper presents investigations of microstructure of varistors of damaged surge arrester counters. A similar ZnO varistor, not subjected before to operation, was a point of reference in this research. The results of investigations of the ZnO varistors show an untypical phase composition of their material, which was characterized by unsatisfying homogeneity and cohesion. The degradation processes of varistor material in the subsequent stages were recognized and described. A harmful impact of humidity inside the untight surge arrester counter on its operation and its ZnO varistors was proved. Some conclusions being the result of the operation checking of surge arrester counters were presented too.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 191-196
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Studies on Degradation of Varistors Subjected to Operation in Surge Arresters and Surge Arrester Counters
    Autorzy:
    Papliński, P.
    Wańkowicz, J.
    Śmietanka, H.
    Ranachowski, P.
    Ranachowski, Z.
    Kudela, S. jr.
    Aleksiejuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351611.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surge arrester
    surge arrester counter
    MO varistor
    microstructure of ceramics
    ceramic material degradation
    Opis:
    The paper presents results of investigation of microstructure and micro-hardness for material of ZnO varistors applied to 110 kV surge arrester and surge arrester counter. The research combined two pairs of varistors, each consisted of one varistor subjected before to operation, while the other one was brand new unit and constituted a reference. All varistors were made of the same material by the reputable manufacture. The tests revealed a different degree of the material degradation for varistors subjected before to operation. This also refers to different degradation mechanism observed for the material of these varistors, if typical effects of degradation of aged ZnO varistors were considered as a reference. Physical state of spinel in the microstructure had a significant impact on the material degradation, however a considerable loosening of the microstructure associated with bismuth oxide was observed too. It was surprising, since the precipitates of the bismuth oxide phase most often showed very good binding to the ZnO matrix and high resistance to associated electrical, thermal and mechanical effects. The degradation effects in the ZnO matrix proved to be limited only.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 367-374
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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