Blar i Publikasjoner fra CRIStin - SINTEF Energi på forfatter "Unge, Mikael"
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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 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) -
Modeling the transition to fast mode streamers in dielectric liquids
Madshaven, Inge; Åstrand, Per-Olof; Hestad, Øystein Leif Gurandsrud; Unge, Mikael; Hjortstam, O. (Proceedings of IEEE International Conference on Dielectric Liquids;2017, Chapter; Peer reviewed, 2017)A simplified model for photoionization, modeling fast streamer propagation, is combined with an existing model for slow streamers, based on electron avalanches. Transitions from fast mode to slow mode, and from slow mode ... -
Photoionization model for streamer propagation mode change in simulation model for streamers in dielectric liquids
Madshaven, Inge; Hestad, Øystein Leif Gurandsrud; Unge, Mikael; Hjortstam, Olof; Åstrand, Per-Olof (Journal article; Peer reviewed, 2019)Radiation is important for the propagation of streamers in dielectric liquids. Photoionization is a possibility, but the effect is difficult to differentiate from other contributions. In this work, we model radiation from ... -
Pressure Dependent Propagation of Positive Streamers in a long Point-Plane Gap in Transformer Oil
Linhjell, Dag; Lundgaard, Lars Esben; Unge, Mikael (Proceedings of IEEE International Conference on Dielectric Liquids;, Chapter; Peer reviewed, 2019)The propagation of positive streamers in a naphtenic transformer oil in an 80 mm point-plane gap has been investigated under an impulse voltage being close to a step voltage and under pressures ranging from 0.1 to 1.7 MPa. ... -
Simulation model for the propagation of second mode streamers in dielectric liquids using the Townsend-Meek criterion
Madshaven, Inge; Åstrand, Per-Olof; Hestad, Øystein; Ingebrigtsen, Stian; Unge, Mikael; Hjortstam, Olof (Journal article; Peer reviewed, 2018)