Browsing SINTEF Open by Author "Berg, Gunnar"

Now showing items 1-7 of 7

    • 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 ...

    • An autonomous drone-based system for inspection of electrical substations 

      Langåker, Helge-André; Kjerkreit, Håkon; Syversen, Christoffer L; Moore, Richard J.D.; Holhjem, Øystein Hov; Jensen, Irene; Morrison, Aiden J; Transeth, Aksel Andreas; Kvien, Oddgeir; Berg, Gunnar; Olsen, Thomas; Hatlestad, Alexander; Negård, Thomas; Broch, Rolf; Johnsen, Jørn E (Peer reviewed; Journal article, 2021)

    • An autonomous drone-based system for inspection of electrical substations 

      Langåker, Helge-André; Kjerkreit, Håkon; Syversen, Christoffer L; Moore, Richard J.D.; Holhjem, Øystein Hov; Jensen, Irene; Morrison, Aiden J; Transeth, Aksel Andreas; Kvien, Oddgeir; Berg, Gunnar; Olsen, Thomas; Hatlestad, Alexander; Negård, Thomas; Broch, Rolf; Johnsen, Jørn E (Peer reviewed; Journal article, 2021)
      In the years to come, large power grid operators will operate and maintain an ever-increasing asset base. New innovative solutions are needed to increase the quality and efficiency of asset management to avoid corresponding ...

    • Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway 

      Eberg, Espen; Aakre, Torstein Grav; Berg, Gunnar; Hvidsten, Sverre (Chapter; Peer reviewed, 2018)
      Stator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition ...

    • 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 ...

    • HydroStator : hovedfunn og resultater i KPN-prosjektet HydroStator 

      Berg, Gunnar; Eberg, Espen; Aakre, Torstein Grav; Ildstad, Erling; Kantar, Emre; Nysveen, Arne (SINTEF Rapport;, Research report, 2022)
      Modeller som beskriver temperatur- og frekvensavhengighet til elektriske delutladninger er utviklet og viser at tilstandskontroll med den mer praktiske VLF-metoden som benytter 0,1 Hz høyspenning er representativ for 50 ...

    • Testing of an MgB2 coil for a wind turbine generator pole 

      Magnusson, Niklas; Hellesø, Svein Magne; Mikkonen, R.; Abrahamsen, A.B.; Runde, Magne; Berg, Gunnar; Nysveen, Arne (Peer reviewed; Journal article, 2021)
      We report on the testing of a 1 m long and 0.5 m wide racetrack coil wound from 4.5 km of MgB2 tape-shaped superconductors with a copper strip soldered to the nickel matrix. The cross-section of the coil corresponds to ...