Sökning: "dielectric properties"

Visar resultat 1 - 5 av 190 avhandlingar innehållade orden dielectric properties.

  1. 1. Cellulose-based electrical insulation materials : Dielectric and mechanical properties

    Detta är en avhandling från KTH Royal Institute of Technology

    Författare :Rebecca Hollertz; KTH.; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cellulose; dielectric materials; electrical insulation; nanocellulose; nanoparticles; streamer; Fiber- och polymervetenskap; Fibre and Polymer Science;

    Sammanfattning : The reliability of the generation and distribution of electricity is highly dependent on electrical insulation and is essential for the prosperity of our society and a ubiquitous part of our everyday life. The present study shows how some important material properties affect the electrical properties of cellulose-based electrical insulation systems which are used together with mineral oil in high-voltage transformers. LÄS MER

  2. 2. The dielectric properties of solid biofuels

    Detta är en avhandling från Västerås : Mälardalen University

    Författare :Ana Marta Paz; Mälardalens högskola.; [2010]
    Nyckelord :dielectric properties; solid biofuels; moisture content determination; Energy- and Environmental Engineering; energi- och miljöteknik;

    Sammanfattning : The use of bioenergy has been increasing due to efforts in fossil fuels replacement. Modern bioenergy technologies aim for high efficiency and low pollution levels, which increases the need for methods for the on-line characterization of biofuels. LÄS MER

  3. 3. Dielectric properties of poly(ethyelene-co-butyl acrylate) filled with Alumina nanoparticles

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Nadejda Jäverberg; KTH.; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nanocomposites; poly ethylene-co-butyl acrylate ; EBA; alumina; dielectric permittivity; absorbed water; humidity; temperature; dielectric spectroscopy; partial discharge; electrical treeing; TECHNOLOGY Electrical engineering; electronics and photonics Electrical engineering; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Elektroteknik;

    Sammanfattning : In this work dielectric properties of the poly(ethylene-co-butyl acrylate)filled with alumina nanoparticles are evaluated. These nanocomposite materialswere manufactured at the department of Fibre and Polymer Technology,KTH.This study is limited to the properties of general importance for the AC applications. LÄS MER

  4. 4. Dielectric properties of machine insulation studied with dielectric response

    Detta är en avhandling från Institutionen för elkraftteknik

    Författare :Anders Helgeson; KTH.; [1997]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  5. 5. On the Dielectric Losses of Polyethylene at Medium and High Frequencies

    Detta är en avhandling från Institutionen för elkraftteknik

    Författare :Martin Strååt; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dielectric properties; foaming; crystallinity; polyethylene; frequency; porosity;

    Sammanfattning : AbstractAs mobile communication moves from 3G to 4G, the bandwidth used will be extended from 2 GHz to 5 GHz. The propagation loss is related to the 2.6:th power of frequency, thus a large increase in power consumption may be expected. LÄS MER