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Jorunn Hølto

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Jorunn Hølto

Forsker

Jorunn Hølto
Telefon: +47 415 24 155
Avdeling: Elkraftteknologi
Kontorsted: Trondheim

Publikasjoner og ansvarsområder

Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1716051

The main objective of this study is to identify reliable insulation materials and systems for novel AC and DC subsea power connectors for oil and gas exploitation. A combined solid-liquid insulation system might be radically altered if the materials are not compatible. Different combinations of rele...

År 2019
Type Tidsskriftspublikasjon
Publikasjon
https://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...

Forfattere Aakre Torstein Grav Hestad Øystein Hølto Jorunn Hvidsten Sverre
År 2016
Type Del av bok/rapport
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1258256

This paper presents results from numerical calculations of water ingress in a wet designed subsea XLPE cable equipped with a two-layered outer sheath, and results from water tree ageing at different relative humidity (RH) levels in an XLPE cable core. The results from the water tree ageing show that...

Forfattere Ve Torbjørn Hvidsten Sverre Hølto Jorunn Hellesø Svein Magne Furuheim Knut Magne Hedström Hanna
År 2016
Type Del av bok/rapport
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1258147

Stress-induced electrochemical degradation (SIED) structures are likely initiated at the surface of the conductor screen of insulated XLPE cables with stranded aluminum conductors due to water ingress and corrosion. In time such structures initiate severe vented water treeing which significantly red...

Forfattere Hølto Jorunn Bakken Kristine Hvidsten Sverre
År 2016
Type Del av bok/rapport
Publikasjon
https://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 Del av bok/rapport
Publikasjon
https://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 Del av bok/rapport
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1271872

Electrocoalescence of water drops in a stagnant water-in-oil emulsion has been studied in a newly developed test cell. An homogeneous electric field was applied across the emulsion volume. It was used to observe drop behaviour in a multi-drop system. The emulsion was made of napthenic oilcontaining ...

År 2009
Type Del av bok/rapport