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Wyszukujesz frazę "natural esters" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Measurements of the selected thermal properties of insulating liquids used in the high voltage power transformers
    Autorzy:
    Dombek, G.
    Nadolny, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/97642.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    mineral oils
    natural esters
    synthetic esters
    thermal conductivity
    measurement automation
    Opis:
    For over a hundred years, mineral oils, because of their numerous positive characteristics and very good recognition, are commonly used in high voltage power transformers. In recent years, great attention is paid to safety associated with the transformers operation and environmental properties of the electrical insulating liquids. Therefore, a few years ago, appeared the concept of using natural esters and synthetic esters in transformers, in place of conventionally used mineral oil as electro-insulating liquid. Thermal properties of these esters are not fully recognized, including thermal conductivity. Thus, this article is devoted to the authorial system for measuring the thermal conductivity of insulating liquids.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 189-198
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal properties of nanoliquids prepared on the basis of natural ester modified by nanoparticles TiO2 and C60
    Autorzy:
    Dombek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/97730.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    natural esters
    thermal conductivity
    viscosity
    density
    specific heat
    high voltage power transformers
    heat transfer coefficient
    nanoliquids
    Opis:
    In this paper the results of the researches concerning thermal properties of insulting nanoliquids received on the basis of natural ester, titan dioxide TiO2 and fullerene C60 were presented. Thermal conductivity, viscosity, density and specific heat are these thermal properties. The range of the temperature was changing from 25°C to 80°C. These properties are crucial from the viewpoint of heat transfer coefficient by insulating liquid used in insulating system of power equipment; thus, they influence on temperature distribution inside the equipment. The possibility of receiving steady nanoliquids was also analyzed. The impact of natural ester modification by nanoparticles and surfactant on thermal properties of received nanoliquids was proved.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 404-413
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Streamer propagation in a non-uniform electric field under lightning impulse in short gaps insulated with natural ester and mineral oil
    Autorzy:
    Rozga, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/202153.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    natural esters
    mineral oil
    lightning impulse
    streamer propagation
    light emission
    estry naturalne
    olej mineralny
    propagacja
    emisja światła
    Opis:
    This article describes the comparative experimental studies on streamer propagation in natural ester and mineral oil under a high voltage lightning impulse. These studies were concentrated around the small electrode gaps and the point-plane electrode arrangement. The spatial shapes of the developing streamers, light emission and propagation velocity were analyzed and compared between the two different dielectric liquids. In both of them two streamer propagation modes were registered during the studies performed. Propagation of slow 2nd mode streamers took place below the so-called acceleration voltage while fast 3rd mode streamers developed at acceleration voltage and above. Comparing the streamer shapes corresponding to a given voltage polarity, no visible differences were observed between the liquids tested. Concerning the light emission, higher frequencies of light pulses were registered however in the case of natural ester. The significant differences between both liquids were noticed in the value of the acceleration voltage estimated. In the case of positive polarity streamers started to develop in natural ester as a 3rd mode at lower value of testing voltage than in the case of mineral oil. For negative polarity, within the applied testing voltages, 3rd mode streamers appeared only in natural ester. On this basis, the fundamental conclusion is that natural ester may have a lower ability of preventing the development of fast and energetic 3rd mode streamers, even at small electrode gaps.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 171-179
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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