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Viser treff 1-34 av 34

2020
1 Berg, Gunnar; Eberg, Espen; Hvidsten, Sverre.
Partial Discharge Characterisation of Stator Windings Taken from a 50-year-old Norwegian Hydrogenerator. I: 2019 IEEE Electrical Insulation Conference - EIC. IEEE 2020 ISBN 978-1-5386-7624-0.
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2018
2 Berg, Gunnar.
Tilstandskontroll av krafttransformatorer - feildeteksjon og diagnosemetoder. Oslo: Energi Norge AS 2018 (ISBN 978-82-436-1050-7) 48 s. Publikasjon (Energi Norge)(431-2018)
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3 Eberg, Espen; Aakre, Torstein Grav; Berg, Gunnar; Hvidsten, Sverre.
Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway. I: 2018 IEEE Electrical Insulation Conference - EIC. IEEE conference proceedings 2018 ISBN 978-1-5386-4178-1. s. 542-546
ENERGISINT NTNU Untitled
 
2016
4 Lesaint, Cedric Michel; Berg, Gunnar; Lundgaard, Lars Esben; Ese, Marit-Helen Glomm.
A novel bench size model coalescer: Dehydration efficiency of AC fields on water-in-crude-oil emulsions. IEEE transactions on dielectrics and electrical insulation 2016 ;Volum 23.(4) s. 2015-2020
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2015
5 Hellesø, Svein Magne; Atten, Pierre; Berg, Gunnar; Lundgaard, Lars Esben.
Experimental study of electrocoalescence of water drops in crude oil using near-infrared camera. Experiments in Fluids 2015 ;Volum 56.(122)
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2013
6 Lesaint, Cedric Michel; Simon, Sebastien Charles; Lesaint, Caterina; Glomm, Wilhelm; Berg, Gunnar; Lundgaard, Lars Esben; Sjøblom, Johan.
Dielectric Properties of Asphaltene Solutions: Solvency Effect on Conductivity. Energy & Fuels 2013 ;Volum 27.(1) s. 75-81
ENERGISINT NTNU Untitled
 
2012
7 Berg, Gunnar; Sæternes, Hans Helmer; Aakervik, Jørund; Hvidsten, Sverre.
The effect of hydrostatic pressure on electrical treeing in silicone cable joints. I: Conference Record of the 2012 IEEE International Symposium on Electrical Insulation. IEEE conference proceedings 2012 ISBN 978-1-4673-0486-3. s. 609-612
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2011
8 Aakervik, Jørund; Berg, Gunnar; Hvidsten, Sverre.
Design of a High Voltage Penetrator for High Pressure and Temperature Laboratory Testing. Conference on Electrical Insulation and Dielectric Phenomena. Annual Report 2011 s. 267-270
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9 Kvien, Oddgeir; Berg, Gunnar; Hvidsten, Sverre.
Material erosion and build-up at the high voltage electrode during PD testing of subsea insulation materials using a modified Cigré II test method. Conference on Electrical Insulation and Dielectric Phenomena. Annual Report 2011 s. 448-451
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2009
10 Hølto, Jorunn; Berg, Gunnar; Lundgaard, Lars Esben.
Electrocoalescence of Drops in a Water-in Oil Emulsion. I: 2009 Annual Report Conference on Electrical Insualtion and Dielectric Phenomena. : IEEE Conference Proceedings 2009 ISBN 9781424445592. s. 196-199
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11 Susa, Dejan; Lundgaard, Lars Esben; Berg, Gunnar; Mjelve, Asgeir.
Power transformer on-line multi-gas monitoring system. I: Proceedings of the 21th Nordic Insulation Symposium : Nord-IS 09 : June 15-17, 2009, Gothenburg, Sweden. Gothenburg, Sweden: Chalmers University of Technology 2009 ISBN 978-91-633-4880-8. s. 271-274
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2008
12 Kvien, Oddgeir; Berg, Gunnar; Hølto, Jorunn.
Partial discharge testing of subsea insulation materials development of testing methods. I: 2008 International Symposium on Electrical Insulating Materials - ISEIM 2008. IEEE conference proceedings 2008 ISBN 978-4-88686-005-7.
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2006
13 Atten, Pierre; Lundgaard, Lars Esben; Berg, Gunnar.
A simplified model of electrocoalescence of two close water droplets in oil. Journal of Electrostatics 2006 ;Volum 64.(7-9) s. 550-554
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2005
14 Berg, Gunnar; Ingebrigtsen, Stian.
Electrostatic forces between charged and uncharged water drops in dielectric liquids. I: Proceedings of the 19th Nordic Insulation symposium. Tapir Akademisk Forlag 2005 ISBN 8251920558.
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15 Berg, Gunnar; Lundgaard, Lars Esben; Hansen, F.K..
Elongation of water drops in oil during transient electric fields. I: 2005 International Conference on Dielectric Liquids, ICDL 2005. IEEE conference proceedings 2005 ISBN 0780389549. s. 189-192
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16 Chiesa, Matteo; Melheim, Jens Andreas; Pedersen, Per Atle; Ingebrigtsen, Stian; Berg, Gunnar.
Forces acting on water droplets falling in oil under the influence of an electric field: Numercal predictions versus experimental observations. European journal of mechanics. B, Fluids 2005 ;Volum 26. s. 717-732
ENERGISINT NTNU Untitled
 
17 Ingebrigtsen, Stian; Berg, Gunnar; Lundgaard, Lars Esben.
Electrocoalescence in stagnant emulsions. I: 2005 International Conference on Dielectric Liquids, ICDL 2005. IEEE conference proceedings 2005 ISBN 0780389549. s. 209-212
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18 Lundgaard, Lars Esben; Berg, Gunnar; Ingebrigtsen, Stian; Atten, Pierre.
Electrocoalescence for Oil-Water Separation: Fundamental Aspects. I: Emulsions and Emulsion Stability, 2nd edition. Taylor & Francis 2005 ISBN 0-8247-2695-2. s. 549-592
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2004
19 Hestad, Øystein Leif Gurandsrud; Berg, Gunnar; Ingebrigtsen, Stian; Liland, Knut Brede.
Streamer injection and growth under impulse voltage : a comparison of cyclohexane, Midel 7131 and Nytro 10X. I: 2004 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena - CEIDP 2004. IEEE conference proceedings 2004 ISBN 0-7803-8584-5.
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2003
20 Berg, Gunnar; Lundgaard, Lars Esben; Machazek, L..
Discharge signatures from a wedge geometry in transformer insulation of paper. I: 13th International symposium on high voltage Engineering - ISH 2003. Rotterdam: Millpress 2003 ISBN 9077017798. s. 591-591
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21 Lundgaard, Lars Esben; Berg, Gunnar; Brede, Arne Petter; Kyrkjeeide, Stig Lidvin.
Acoustic location of discharges in power transformers. I: 13th International symposium on high voltage Engineering - ISH 2003. Rotterdam: Millpress 2003 ISBN 9077017798. s. 582-582
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2002
22 Berg, Gunnar; Lundgaard, Lars Esben.
PD signatures of wedge type discharges in transformer insulation. I: Proceedings of the 2002 14th IEEE International Conference on Dielectric Liquids - ICDL 2002. IEEE conference proceedings 2002 ISBN 0-7803-7350-2.
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23 Berg, Gunnar; Lundgaard, Lars Esben; Becidan, Michael; Sigmond, Reidar Svein.
Instability of electrically stressed water droplets in oil. I: Proceedings of the 2002 14th IEEE International Conference on Dielectric Liquids - ICDL 2002. IEEE conference proceedings 2002 ISBN 0-7803-7350-2.
ENERGISINT NTNU Untitled
 
24 Lundgaard, Lars Esben; Berg, Gunnar; Pedersen, Per Atle; Nilsen, Pål Jahre.
Electrocoalescence of water drop pairs in oil. I: Proceedings of the 2002 14th IEEE International Conference on Dielectric Liquids - ICDL 2002. IEEE conference proceedings 2002 ISBN 0-7803-7350-2.
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2001
25 Lundgaard, Lars Esben; Linhjell, Dag; Berg, Gunnar.
Streamer/leaders from a metallic particle between parallel plane electrodes in transformer oil. IEEE transactions on dielectrics and electrical insulation 2001 ;Volum 8.(6) s. 1054-1063
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1999
26 Berg, Gunnar; Lundgaard, Lars Esben.
Discharges in combined transformer oil/paper insulation. I: Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids - ICDL'99. IEEE conference proceedings 1999 ISBN 0-7803-4759-5.
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27 Linhjell, Dag; Berg, Gunnar; Lundgaard, Lars Esben.
Streamers from a metallic particle between parallel plane electrodes in transformer oil. I: Proceedings of 1999 IEEE 13th International Conference on Dielectric Liquids - ICDL'99. IEEE conference proceedings 1999 ISBN 0-7803-4759-5.
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1998
28 Lundgaard, Lars Esben; Linhjell, Dag; Berg, Gunnar; Sigmond, Reidar Svein.
Propagation of positive and negative streamers in oil gaps with and without pressboard interfaces. IEEE transactions on dielectrics and electrical insulation 1998 ;Volum 5.(3) s. 388-395
ENERGISINT NTNU Untitled
 
1996
29 Lundgaard, Lars Esben; Linhjell, Dag; Berg, Gunnar; Sigmond, Reidar Svein.
Positive and negative streamers in oil gaps with and without pressboard interfaces. I: 12th International Conference on Conduction and Breakdown in Dielectric Liquids 1996 - ICDL'96. IEEE conference proceedings 1996 ISBN 0-7803-3560-0. s. 175-180
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1995
30 Berg, Gunnar.
Physics of electrocal breakdown of transformer oil. Trondheim: NTNU 1995 (ISBN 8271198785) Doktor ingeniør avhandling, ntnu(1995:125)
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1994
31 Linhjell, Dag; Lundgaard, Lars Esben; Berg, Gunnar.
Streamer propagation under impulse voltage in long point-plane oil gaps. IEEE transactions on dielectrics and electrical insulation 1994 ;Volum 1.(3) s. 447-458
ENERGISINT NTNU Untitled
 
1993
32 Berg, Gunnar; Sigmond, Reidar Svein.
The initial stages of positive and negative corona DC breakdown of transformer oil. I: Proceedings of 1993 IEEE 11th International Conference on Conduction and Breakdown in Dielectric Liquids -ICDL'93. IEEE conference proceedings 1993 ISBN 0-7803-0791-7. s. 342-346
ENERGISINT NTNU Untitled
 
33 Linhjell, Dag; Berg, Gunnar; Lundgaard, Lars Esben.
Streamer propagation in long point-plane oil gaps. I: Proceedings of 1993 IEEE 11th International Conference on Conduction and Breakdown in Dielectric Liquids -ICDL'93. IEEE conference proceedings 1993 ISBN 0-7803-0791-7. s. 268-273
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1992
34 Dejean, P.; Berg, Gunnar; Goldman, M; Sigmond, Reidar Svein; Dejean, H..
Ageing kinetics of solid insulating materials submitted to partial discharges. I: Proceedings of the 4th International Conference on Conduction and Breakdown in Solid Dielectrics 1992. IEEE conference proceedings 1992 ISBN 0-7803-0129-3. s. 200-204
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