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Øystein Hestad

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Øystein Hestad

Forsker

Øystein Hestad
Telefon: 971 12 257
Mobil: 971 12 257
Avdeling: Elkraftteknologi
Kontorsted: Trondheim

Publikasjoner og ansvarsområder

Publikasjoner

Publikasjon

Conductivity and permittivity of Midel 7131 : effect of temperature, moisture content, hydrostatic pressure and electric field

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+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 mat...

År 2016
Type Tidsskriftsartikkel
Publikasjon

Effect of static mechanical strain on the DC conductivity of extruded cross-linked polyethylene cable insulation

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1258129

DC current measurements were performed on a medium voltage XLPE cable at voltages from 8.5 to 65 kV (average field from 2.5 to 19 kV/mm). To assess the effect of mechanical strain on the conductivity of the insulation, the cable was wrapped around a tube with an outer diameter of 110 mm (max strain ...

Forfattere Hestad Øystein Enoksen Henrik Hvidsten Sverre
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Self-healing composites for high voltage electrical insulation

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1258142

A self-healing electrical insulation material for high voltage apparatuses has yet not been developed. Such a material would have been very attractive for electrical components installed in conditions were service failures cause time consuming and very expensive replacements. This paper reports resu...

Forfattere Lesaint Cedric Risinggård Vetle Meland Hestad Øystein Hvidsten Sverre Glomm Wilhelm
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

The effect of temperature cycling on mechanical and electrical properties of syndiotactic polypropylene

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1375207

Polypropylenes (PP) are a candidate to replace cross-linked polyethylene (XLPE) in medium voltage cables. This is due to its recyclability and potentially lower energy consumption during production. To prove to be an alternative, the PPs must meet the same requirements as for XLPE. The maximum servi...

År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Thermal Decomposition of Cyclohexane by Kinetic Monte Carlo Simulations and its Relevance to Streamer Formation

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1399249

Kinetic Monte Carlo was used to simulate the decomposition of cyclohexane at temperatures up to 10 000 K. Rate constants needed for the simulations were obtained from literature and combined with differences in Gibbs free energy between the reactants and products. The degree of decomposition and an ...

Forfattere Hestad Øystein Vuong Au-Dung Madshaven Inge Åstrand Per-Olof Harald
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Photoionization Model for the Transition to Fast Mode Streamers in Dielectric Liquids

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+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 poten...

Forfattere Madshaven Inge Smalø Hans Sverre Unge Michael Hestad Øystein
År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Field and Temperature Dependent Conductivity of Syndiotactic Polypropylene : Effect of temperature and electric field

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1142928

Syndiotactic polypropylene (s-PP) is an extrudable polymer with properties which should make it highly suitable as high voltage cable insulation, including high AC breakdown strength, flexibility and a high melting point. However, for HVDC applications it is important to improve the knowledge of cha...

År 2014
Type Konferanseartikkel/Bokkapittel
Publikasjon

Self-healing high voltage electrical insulation materials

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1142937

Electrical treeing can be the precursor to catastrophic failure for electrical insulation materials and hence significantly shorten their service lifetime. Considering that damage inside the composites (thermoset insulation materials containing fillers) is difficult to detect and particularly to rep...

År 2014
Type Konferanseartikkel/Bokkapittel
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