Browsing NTNU Open by Author "Håkonseth, Gunnar"
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Diffusjon av vann i sotfylte kappematerialer for polymere sjøkabler
Håkonseth, Gunnar (Master thesis, 2011)Vanntrevekst er den viktigste årsaken til aldring i polymerisk isolasjon i mellomspenningskabler. Sia vanntrær ikke dannes ved lav relativ fuktighet (R.H.), er det viktig å holde relativ fuktighet i isolasjonen lav så lenge ... -
Local Electric Field in Mass-Impregnated HVDC Cables
Håkonseth, Gunnar; Ildstad, Erling; Furuheim, Knut Magne (Journal article; Peer reviewed, 2017)Detailed knowledge of the electric field in the insulation of mass-impregnated HVDC cables is important in order to understand their breakdown mechanisms and to improve their design. When calculating the local electric ... -
Steady-State Electric Field and Conductivity in Mass-Impregnated HVDC Cable Insulation
Håkonseth, Gunnar; Ildstad, Erling (Chapter, 2018)This paper presents results from measurements and calculations of the steady-state DC electric field and the field-dependent conductivity in the two insulation materials found in mass-impregnated HVDC cables: Cable mass ... -
Structure of Paper-Oil Insulation for Mass-Impregnated HVDC Cables
Håkonseth, Gunnar; Furuheim, K. M.; Ildstad, Erling (Chapter, 2019)The electrical insulation in mass-impregnated high voltage direct current (HVDC) cables consists of many layers of paper tapes that are wound helically around the conductor and subsequently impregnated in oil. The oil fills ... -
Time-Dependent Electric Field Distribution in Layered Paper-Oil Insulation
Håkonseth, Gunnar; Ildstad, Erling (Journal article; Peer reviewed, 2019)Layered paper–oil insulation is used in several types of HVDC equipment. In order to better understand breakdown mechanisms and optimize the design, it is important to understand the electric field distribution in the ... -
Transient Electric Field Distribution Estimates for Layered Paper-Oil High Voltage Direct Current Insulation: Effects of Slow Polarization and Applicability of Dielectric Response Theory
Håkonseth, Gunnar (Doctoral theses at NTNU, 2020:342, Doctoral thesis, 2020)The aim of this work is to contribute to an increased capacity of mass-impregnated, high voltage direct current (HVDC) cables. This has been done by providing a better understanding of the transient electric field distribution ...