Sökning: "Cross-linked polyethylene"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden Cross-linked polyethylene.

  1. 1. Residual Stresses and Strains in Cross-linked Polyethylene Power Cable Insulation

    Författare :Lorant Olasz; Peter Gudmundson; Ulf Stigh; KTH; []

    Sammanfattning : The subject of this thesis is modeling of the manufacturing process of high voltage power cables with the aim of predicting residual stresses and strains in the cable insulation. The studied material is cross-linked polyethylene (XLPE), which at room temperature is a semi-crystalline viscoelastic solid. LÄS MER

  2. 2. Characterising Resistance to Electrical Treeing in New XLPE-Based Materials for High-Voltage Cables

    Författare :Anette Johansson; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; electrical treeing; partial discharge; cross-linked polyethylene; voltage stabiliser; degradation; power cables;

    Sammanfattning : This work looks into electrical treeing in cross-linked polyethylene-based materials (XLPE), where the ability to resist tree development is considered as an indicator of improved applicability for insulation in high voltage power cables. The thesis presents results of a twin PhD project involving joint work of two students. LÄS MER

  3. 3. Evaluation of methods of measuring wear of polyethylene acetabular components intotal hip arthroplasty

    Författare :Charles R Bragdon; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :Total hip replacement; polyethylene; wear; radiostereometric analysis; radiograph;

    Sammanfattning : Background: The introduction of highly cross-linked, wear resistant polyethylene acetabularcomponents for clinical use in total hip replacements has intensified the interest in and need for highlyaccurate methods of measuring wear from clinical radiographs. There are several methods currentlyavailable for measuring the relative displacement of the femoral head into the acetabular componentresulting from the combination of plastic deformation and wear of the polyethylene bearing surface. LÄS MER

  4. 4. Techniques for Localization of Insulation Degradation along Medium-Voltage Power Cables

    Författare :Ruslan Papazyan; Roland Eriksson; Fred Steennis; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical power technology; Attenuation measurement; cross-linked polyethylene insulation; discontinuities; localization; mass-impregnated insulation; numerical analysis; parameter estimation; power cable metallic screen; scattering parameters; time domain reflectometry; velocity measurements; water treeing; Elkraftteknik; Electric power engineering; Elkraftteknik;

    Sammanfattning : Time Domain Reflectometry (TDR) has been used for localization of transmission line discontinuities in diverse applications. Various challenges have to be addressed when applying TDR for localization of insulation degradation in power cables. LÄS MER

  5. 5. Characterization of Conduction and Polarization Properties of HVDC Cable XLPE Insulation Materials

    Författare :Hossein Ghorbani; Hans Edin; Erling Ildstad; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC insulation; power cable insulation; cross-linked polyethylene insulation; conductivity; dielectric losses; space charge; HVDC isolation; kraftkabel isolation; tvärbunden polyeten isolationsmaterial; elektrisk ledningsförmåga; dielektriska förluster; rymdladdning; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Since its first introduction in 1998, extruded direct current (DC) cable technology has been growing rapidly leading to many cable system installations with operation voltages up to 320 kV. Cable manufacturers invest heavily on technology development in this field and today extruded DC cable systems for operation voltages as high as 525 kV are commercially available. LÄS MER