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Gunnar Berg

Research Scientist

Gunnar Berg

Research Scientist

Gunnar Berg
Phone: 924 58 111
Department: Electric Power Technology
Office: Trondheim

Publications and responsibilities

Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1619732

Stator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition assessment and monitoring of electrical machines. The main concern of using very lo...

Authors Eberg Espen Aakre Torstein Grav Berg Gunnar Hvidsten Sverre
Year 2018
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1385596

We describe herein the design of a small AC electrostatic model coalescer for investigating coalescence efficiency of water in oil emulsions. The function of the model coalescer is tested on emulsions with different water cuts. In the coalescer, coalescence takes place in a couette flow in the bulk ...

Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+1246898

Results are presented concerning the influence of an applied electric field on the coalescence of a water droplet with a much bigger water drop, both drops being immersed in a crude oil. This original study of electrocoalescence in crude oil was performed through high-speed optical observations, usi...

Authors Hellesø Svein Magne Atten Pierre Berg Gunnar Lundgaard Lars Esben
Year 2015
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+990913

Electrical demulsification is considered an elegant method to enhance the separation of water-in-crude-oil emulsions. Understanding the mechanisms involved during this process remains a challenge for the further development of this separation method. The aim of this study is to elucidate the influen...

Authors Lesaint Cedric Michel Simon Sebastien Charles Lesaint Caterina Glomm Wilhelm Berg Gunnar Lundgaard Lars Esben Sjøblom Johan
Year 2013
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+938785

The purpose of this work was to study the effect of hydrostatic pressure on the initiation and growth of electrical trees in a silicone insulation material for electrical apparatus. In this study a commercial available light transparent silicone material was subjected to a hydrostatic pressure in th...

Year 2012
Type Part of a book/report
Publication
https://www.sintef.no/en/publications/publication/?pubid=CRIStin+907558

High voltage apparatus and reliable power supply are of vital importance for subsea processing. The purpose of this work has been to develop a small high voltage penetrator for use with high pressure vessels in the laboratory. Such equipment can facilitate high voltage and current testing of models ...

Year 2011
Type Journal publication
Publication
https://www.sintef.no/en/publications/publication/?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 ...

Year 2009
Type Part of a book/report