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    Wyświetlanie 1-7 z 7
    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:
    Measurement of thermal conductivity coefficient of insulating liquids using authoring measurement system
    Pomiar współczynnika przewodności cieplnej właściwej cieczy elektroizolacyjnych z wykorzystaniem autorskiego układu pomiarowego
    Autorzy:
    Dombek, G.
    Nadolny, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/408382.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    thermal conductivity coefficient
    insulating liquids
    measurement techniques
    przewodność cieplna właściwa
    ciecze elektroizolacyjne
    technika pomiarowa
    Opis:
    The paper presents the results of measurements of the thermal conductivity coefficient of the selected insulating liquids according to the temperature. The value of the thermal coefficient of tested insulating liquids at temperatures from 20°C to 100°C was determined. Measurement of thermal conductivity was conducted by the use of presented authoring measurement system. The obtained results are essential to the design of power devices structures.
    W artykule przedstawione zostały wyniki pomiarów współczynnika przewodności cieplnej właściwej wybranych cieczy elektroizolacyjnych w zależności od temperatury. Określona została wartość współczynnika przewodności cieplnej badanych cieczy elektroizolacyjnych w przedziale temperatury od 20°C do 100°C. Pomiar przewodności cieplnej przeprowadzono przy wykorzystaniu przedstawionego autorskiego układu pomiarowego. Uzyskane wyniki są istotne z punktu widzenia projektowania konstrukcji urządzeń elektroenergetycznych.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2014, 1; 66-68
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    The role of the type of insulating liquid in the transformer temperature distribution
    Autorzy:
    Dombek, G.
    Nadolny, Z.
    Przybyłek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/97345.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    mineral oil
    synthetic ester
    natural ester
    power transformers
    Opis:
    The mineral oil is most frequently used liquid in insulation transformer system. However, increased interest in alternative insulating liquid for it, which includes synthetic ester and natural ester is observable for several years. However, for several years, the increased interest in insulating liquids as alternatives to mineral oil is observable, which include synthetic ester and natural ester. This is due to increasingly restrictive environmental legislation and fire safety. Mineral oil, in comparison with esters has a very good electric insulation properties and a lower viscosity. In turn the esters in comparison with oil, have a much greater biodegradability and have a much higher flash point, which suggests their favor. The influence of the type of insulating liquid on the efficiency of the cooling system of the transformer was presented in the paper. This efficiency was determined by designating the heat transfer coefficient α by liquids. This factor depends on the thermal properties of liquids, which includes the thermal conductivity λ, kinematic viscosity υ, specific heat cp, density ρ, and thermal expansion β. For the study mineral oil, synthetic ester and natural ester were used. The measurements of thermal properties were carried out in the temperature range from 25°C to 80°C.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 148-157
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal properties of nanoliquids in the aspects of their used in the insulation system of high voltage power transformer
    Autorzy:
    Dombek, G.
    Nadolny, Z.
    Przybyłek, P
    Powiązania:
    https://bibliotekanauki.pl/articles/97610.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    nanoliquids
    high voltage power transformers
    thermal properties
    Opis:
    The article presents information concerning the electrical and thermal properties of nanoliquids in the context of their use in the insulating system of high voltage power transformers. It consists of six chapters. The first chapter is an introduction. The second chapter describes properties of the modern insulating nanoliquids created on the basis of mineral oil and nanoparticles. The third chapter is devoted to the measurement systems to the measure of the viscosity, thermal conductivity and density. The fourth chapter presents the methods of preparation of nanoliquids. In the fifth chapter the viscosity, thermal conductivity and density of mineral oil and nanoliquids were compared. Article ends with a summary.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 217-226
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical modeling the temperature field of power transformer
    Autorzy:
    Gościński, P.
    Dombek, G.
    Nadolny, Z.
    Bródka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/97688.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    high voltage power transformers
    similitude theory
    ANSYS CFX
    mineral oil
    Opis:
    High voltage transformer is one of the most important elements of the power system. Due to this reason, it is crucial to properly design and build from mechanical side as well as thermal side. Nowadays, designers of power transformers are using from the many programs that allow you to reduce design time. Additionally, thanks to them, designer can quickly and effectively bring new changes in the construction and see what will be their impact on the work of the transformer. This paper shows design assumptions of the mathematical model of power transformer, the similitude theory which was used to maintain an appropriate scale, and interface of Ansys CFX program, in which simulations of temperature field of power transformer was made.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 138-147
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of heat transfer coefficient of synthetic and natural ester in the aspect of their application in power transformer
    Autorzy:
    Gościński, P.
    Dombek, G.
    Nadolny, Z.
    Bródka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/97728.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    heat transfer coefficient
    high voltage power transformers
    synthetic ester
    natural ester
    Opis:
    Insulating liquids due to their properties are used in electrical power transformers, capacitors, connectors and high voltage power cables. One of the most important tasks for electrical insulating liquids is a heat transport out of the device. The heat transfer in the liquids depends on heat transfer coefficient. The heat transfer coefficient depends on a viscosity, thermal conductivity coefficient and thermal expansion coefficient. This paper shows results of calculations for heat transfer coefficient of insulating liquids used as insulation in electrical equipment, depending on the kind of liquid and temperature. Synthetic ester oil and natural ester oil were analyzed. The range of the temperature was changing from 25°C to 80°C.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 376-385
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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