• A novel bench size model coalescer: Dehydration efficiency of AC fields on water-in-crude-oil emulsions 

      Lesaint, Cedric Michel; Berg, Gunnar; Lundgaard, Lars Esben; Ese, Marit-Helen Glomm (Journal article; Peer reviewed, 2016)
      We describe herein the design of a small AC electrostatic model coalescer for investigating coalescence efficiency of water in oil emulsions. The function of the model coalescer is tested on emulsions with different water ...
    • Electrocoalescence III : staus and summary report from activities 

      Lundgaard, Lars Esben; Munkejord, Svend Tollak; Reboud, Jean-Luc; Lesaint, Cedric Michel; Ervik, Åsmund; Ese, Marit-Helen Glomm (SINTEF Energi. Rapport;, Research report, 2016)
    • Experimental study of electrocoalescence of water drops in crude oil using near-infrared camera 

      Hellesø, Svein Magne; Atten, Pierre; Berg, Gunnar; Lundgaard, Lars Esben (Journal article; Peer reviewed, 2015)
      Results are presented concerning the influence of an applied electric field on the coalescence of a water droplet with a much bigger water drop, both drops being immersed in a crude oil. This original study of electrocoalescence ...
    • Field dependent conductivity of n-pentane 

      Hestad, Øystein Leif Gurandsrud; Linhjell, Dag; Lundgaard, Lars Esben; Samseth, Jarl Ø.; Unge, Mikael (Proceedings of IEEE International Conference on Dielectric Liquids;2017, Chapter; Peer reviewed, 2017)
      A sensitive differential charge measurement technique was used to measure the conduction current from a sharp needle in a needle plane geometry in n-pentane. The current was measured at voltages up to the threshold for ...
    • Field dependent conductivity of n-pentane 

      Hestad, Øystein Leif Gurandsrud; Linhjell, Dag; Lundgaard, Lars Esben; Samseth, Jarl Ø.; Unge, Mikael (Chapter, 2017)
      A sensitive differential charge measurement technique was used to measure the conduction current from a sharp needle in a needle plane geometry in n-pentane. The current was measured at voltages up to the threshold for ...
    • Field-dependent molecular ionization and excitation energies: Implications for electrically insulating liquids 

      Davari, Nazanin; Åstrand, Per-Olof; Unge, Mikael; Lundgaard, Lars Esben; Linhjell, Dag (Journal article; Peer reviewed, 2014)
    • Field-dependent molecular ionization and excitation energies: Implications for electrically insulating liquids 

      Davari, Nazanin; Åstrand, Per-Olof; Unge, Mikael; Lundgaard, Lars Esben; Linhjell, Dag (Journal article; Peer reviewed, 2014)
      Themolecular ionization potential has a relatively strong electric-field dependence as compared to the excitation energies which has implications for electrical insulation since the excited states work as an energy sink ...
    • Time to breakdown studies for liquids of different physico-chemical nature 

      Aakre, Torstein Grav; Lundgaard, Lars Esben; Unge, Mikael (Chapter; Peer reviewed, 2017)
      An automated setup for testing dielectric performance of liquids in a small point-to-plane gap is presented. It provides step voltages with rise times around 30 ns, with amplitudes up to 90 kV. Breakdown studies of thirteen ...
    • Transformer Windings Ageing, diagnosis and asset management. Version 4 

      Lundgaard, Lars Esben; Liland, Knut Brede; Linhjell, Dag; Susa, Dejan; Ese, Marit-Helen; Selsbak, Cecilie Mørk; Kes, M; Lesaint, Cedric Michel (SINTEF Energi. Rapport;TR A7099, Research report, 2015)
      This report addresses state of the art in the field of transformer ageing and diagnostics, with emphasis on advising end-users on transformer asset management and on transformer specification. The basis is results from two ...