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Jorunn Hølto

Research Scientist

Jorunn Hølto

Research Scientist

Jorunn Hølto
Phone: +47 415 24 155
Email:
Department: Electric Power Technology
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/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...

Publication
https://www.sintef.no/en/publications/publication/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...

Authors Jorunn Hølto Kristine Bakken Sverre Hvidsten
Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/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...

Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/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...

Authors Torbjørn Andersen Ve Sverre Hvidsten Jorunn Hølto Svein Magne Hellesø Knut Magne Furuheim Hanna Hedström
Year 2016
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/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...

Year 2014
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/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...

Year 2014
Type Academic chapter/article/Conference paper
Publication
https://www.sintef.no/en/publications/publication/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...

Year 2009
Type Academic chapter/article/Conference paper