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Øystein Hestad

Research Manager

Øystein Hestad

Research Manager

Øystein Hestad
Phone: 971 12 257
Email:
Department: Electric Power Technology
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=1807150

This study addresses the dielectric performance of nonpolar hydrocarbon liquids and mineral oils under negative polarity stress. Stopping length for non-breakdown streamers, breakdown voltages and velocities for various pre-breakdown streamer modes have been studied for a selection of model liquids...

Authors Lars Lundgaard Dag Linhjell Øystein Hestad Michael Unge Olof Hjortstam
Year 2020
Type Academic article
Publication
https://www.sintef.no/en/publications/publication/?pubid=1526030

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 to fast mode, are investigated....

Authors Inge Madshaven Per-Olof Åstrand Øystein Hestad Mikael Unge O. Hjortstam
Year 2017
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1526028

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 streamer inception in n-pentane with a positive needle polarity. The measured...

Authors Øystein Hestad Dag Linhjell Lars Lundgaard Jarl Ø. Samseth Mikael Unge
Year 2017
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/?pubid=1394037

Knowledge of the conductivity and permittivity of materials used in subsea connectors is needed to predict the electric field distribution in the connectors. The synthetic ester Midel 7131, being one of several dielectric liquids used in subsea connectors, has been chosen as a relevant candidate...

Year 2016
Type Academic article
Publication
https://www.sintef.no/en/publications/publication/?pubid=1399267

The transition to fast mode streamers is explained through a model that includes a photoionization mechanism. The model assumes that photons are created in the head of the streamer, and that the photoionization cross section is dependent on the electric field through field dependent ionization...

Authors Inge Madshaven Hans Sverre Smalø Michael Unge Øystein Hestad
Year 2016
Type Academic chapter/article/Conference paper