Browsing Institutt for elkraftteknikk by Issue Date

Now showing items 81-100 of 2415

    • Power system for electric heating of pipelines 

      Novik, Frode Karstein (Master thesis, 2008)
      Direct electrical heating (DEH) of pipelines is a flow assurance method that has proven to be a good and reliable solution for preventing the formation of hydrates and wax in multiphase flow lines. The technology is installed ...

    • New switching pattern for AC/AC converters with RB-IGBTs for offshore wind parks 

      Mogstad, Anne Berit (Master thesis, 2008)
      Offshore wind power has an increasing interest in the research community and among the politicians. Therefore it is important to find the right solutions to meet the environmental and commercial requirements to give offshore ...

    • Energisparepotensialer i næringsbygg 

      Coll, David (Master thesis, 2008)
      Næringsbygg står for en betydelig andel av energibruken i Norge. Ut fra økonomiske, samfunnsmessige og miljømessige forhold er det i dag et betydelig fokus på å redusere denne energibruken. Denne hovedoppgaven omhandler ...

    • Reinvestment strategy making for distribution networks 

      Nordgård, Dag Eirik; Catrinu, Maria; Nybø, Agnes (Research report, 2008)
      The assets of electricity distribution are of critical importance for continuity of service, safety and economic performance. Stakeholders such as customers, regulators and shareholders are increasingly seeking assurance ...

    • Kvalitetssikring av polymerisolerte HVDC kabler ved hjelp av spenningsprøving 

      Ytterstad, Marit Holbø (Master thesis, 2008)
      Kvalitetssikring av polymerisolerte HVDC kabler ved hjelp av spenningsprøving

    • Investigation of Dielectric Response Measurement as a Tool to Detect Copper Sulphide on Insulation Paper 

      Birkelund, Bendik Jørgensen (Master thesis, 2008)
      Several power transformers has, during the last two decades, broken down due to the copper sulphideproblem. Corrosive sulphur reacts with the copper conductor contaminating the surroundinginsulating paper. To this day there ...

    • Splicing and Coil Winding of MgB2 Superconductors 

      Sætre, Frode (Master thesis, 2008)
      Abstract Conventional induction heaters for extrusion purposes have an efficiency of only 55 60 % due to the resistive losses in the copper coils putting up the magnetic field. By using superconductor and DC current these ...

    • Sluttbrukets betydning i energiplanlegging 

      Bjørland, Birger (Master thesis, 2008)
      Sammendrag Energi- og effektknapphet har i stor grad blitt kompensert for ved økt produksjon eller overføringskapasitet, og det har vært lite fokus på sluttbrukets betydning i tradisjonell energiplanlegging. Reduksjonspotensialet ...

    • Optimal forvaltning av reaktiv effekt i regionalnettet i Buskerud 

      Dietrichson, Harald Hole (Master thesis, 2008)
      Arbeidet som presenteres i denne rapporten er utført i samarbeid med Energiselskapet Buskerud (EB). Oppgavens formål har vært å utarbeide en generell metode for å minimere kostnader knyttet til reaktiv effektflyt i ...

    • Implementation of Permanent Magnet Motors in Electric Vehicles 

      Elvestad, Eirik (Master thesis, 2008)
      This thesis has studied permanent magnet motors in electric vehicles (EVs) under the assumption that they are tractable due to a low weight and high compactness. The implementation has been investigated through a case ...

    • Offshore Wind Power in the North Sea: Grid Integration of 1000 MW Offshore Wind Power into the Norwegian Power System 

      Sommerfelt, Knut Magnus (Master thesis, 2008)
      Norway has great potential for offshore wind power, but the depths just outside the coast probably make floating wind turbines necessary. In order to use today s technology for offshore wind turbines with foundations on ...

    • Advanced Battery Diagnosis for Electric Vehicles 

      Lamichhane, Chudamani (Master thesis, 2008)
      Summary Literatures on battery technologies and diagnosis of its parameters were studied. The innovative battery technologies from basic knowledge to world standard testing procedures were analysed and discussed in the ...

    • Voltage Support in Distributed Generation by Power Electronics 

      Strand, Bjørn Erik (Master thesis, 2008)
      There is an increasing amount of power processed through power electronics in the areas of generation interface, energy storage and loads. This increment enables possibilities for improved solutions for efficient generation ...

    • Digital Control of Converters for Distributed Power Generations 

      Skjellnes, Tore (Doktoravhandlinger ved NTNU, 1503-8181; 2008:82, Doctoral thesis, 2008)
      Pulse width modulated converters are becoming increasingly popular as their cost decreases and power rating increases. The new trend of smallscale power producers, often using renewable energy sources, has created new ...

    • Vindpark i skogsterreng 

      Svendsen, Trine (Master thesis, 2008)
      Sammendrag I denne oppgaven er fire skogsområder, Bjørkvatnet, Bjørkhøyden, Øgonfagnaden og Bodhøgaren, nordøst for Østersund modellert i vindsimuleringsprogrammet WAsP med det formål å se hvordan WAsP takler et komplekst ...

    • Elektrisk Fremdriftsystem for Shell Eco-marathon PureChoice Kjøretøy: Beregningning av motorstørrelse for drivstoffgjerrig elektrisk hydrogenkjøretøy. 

      Wiik, Bjørn Ola (Master thesis, 2008)
      Shell Eco-marathon Europe ble første gangen arrangert i 1985 og går ut på at studenter fra høyskoler og universiteter i Europa konkurrerer om å bygge den mest energieffektive bilen. NTNU stilte i år med sitt første bidrag ...

    • Water absorption and dielectric properties of Epoxy insulation 

      Dutta, Saikat Swapan (Master thesis, 2008)
      Characterization of Epoxy (diglycidyl ether of Bis-phenol A cured with Tri ethylene Tetra amine) without fillers was done. The Water absorption test at 95°C shows that at saturation the epoxy contains a water concentration ...

    • Evaluering av pumpene i Vannkraftlaboratoriet 

      Jenssen, Trond William (Master thesis, 2008)
      Vannkraftlaboratoriet har i den siste tiden opplevd stor pågang fra eksterne firmaer som ønsker å teste modeller av turbiner og andre vannkraftmaskiner. Det er derfor ønskelig å kartlegge kapasiteten til pumpene i ...

    • Control of Multi-terminal VSC-HVDC Systems 

      Haileselassie, Temesgen Mulugeta (Master thesis, 2008)
      The North Sea has a vast amount of wind energy with largest energy per area densities located about 100-300Km of distance from shore. Should this energy be tapped by offshore wind farms, HVDC transmission would be the more ...

    • Structural Vulnerability of Energy Distribution Systems; Incorporating Infrastructural Dependencies 

      Helseth, Arild; Holen, Arne T (Journal article; Peer reviewed, 2008)
      In this paper a method for assessing the structural vulnerability of two coupled energy distribution systems is proposed. The co-existing of an electric power distribution system and a district heating system is described ...