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Lars Lundgaard

Sjefforsker

Lars Lundgaard

Sjefforsker

Lars Lundgaard
Telefon: 930 07 018
Mobil: 930 07 018
Avdeling: Elkraftteknologi
Kontorsted: Trondheim

Publikasjoner og ansvarsområder

Publikasjoner

Publikasjon

Statistical analysis of dielectric breakdown of liquid insulated printed circuit boards

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1385663

For introducing power converters at ambient pressure at large sea depths, dielectric liquids are proposed as insulation for power electronic converters. This paper presents statistical analysis of short time tests of partial discharge and breakdown voltage on the trench between metallized edges of p...

Forfattere Abdelmalik Abdelghaffar Amoka Borge Malin Drevdal Nysveen Arne Lundgaard Lars Linhjell Dag
År 2016
Type Tidsskriftsartikkel
Publikasjon

A novel bench size model coalescer: Dehydration efficiency of AC fields on water-in-crude-oil emulsions

http://www.sintef.no/publikasjoner/publikasjon/?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 ...

År 2016
Type Tidsskriftsartikkel
Publikasjon

Liquid insulation of IGBT modules: Long term chemical compatibility and high voltage endurance testing

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1385622

To facilitate operation of power electronics for subsea operation at ambient pressure components have to be submerged in a liquid. Equipment and schemes for testing of long term properties have been developed. Several techniques were used to investigate compatibility between a silicone gel and vario...

År 2016
Type Konferanseartikkel/Bokkapittel
Publikasjon

Transformer Windings Ageing, diagnosis and asset management. Version 4

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1060702

This report addresses state of the art in the field of transformer ageing and diagnostics, with emphasis on advising end-users on transformer asset management and on transformer specification. The basis is results from two projects on laboratory studies on ageing of mineral oil impregnated cellulose...

År 2015
Type Rapport
Publikasjon

Experimental study of electrocoalescence of water drops in crude oil using near-infrared camera

http://www.sintef.no/publikasjoner/publikasjon/?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...

År 2015
Type Tidsskriftsartikkel
Publikasjon

Effects of spatial restriction on streamers in white oil

http://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1162807

Streamer propagation guided within PTFE tubes were investigated in an 8 cm point-plane gap in white oil. Both positive and negative polarities were studied with a near step voltage of 50-400 kV. Streamers in a free volume were compared with those in tubes. Within tubes, branching of streamers is sup...

Forfattere Nguyen Dung Van Linhjell Dag Lundgaard Lars Høidalen Hans Kristian Unge M.
År 2014
Type Konferanseartikkel/Bokkapittel
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