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Showing results 1-50 of 103 << Previous 1 2 3    Next >>

2024
1 Hestad, Øystein Leif Gurandsrud; Aakre, Torstein Grav; Lundgaard, Lars Esben.
Conduction and Electric Fields in Dielectric Liquids in Needle-to-Plane Gaps. IEEE transactions on dielectrics and electrical insulation 2024
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2023
2 Lundgaard, Lars Esben; Enoksen, Henrik; Liland, Knut Brede; Brandtzæg, Georg; Tødenes, Arnt S..
Can winding ageing be modelled? A scrapping investigation of transformer with stable load. Cigre SC A2 & 6th International Colloquium "Transformer Research and Asset Management"; 2023-11-29
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3 Lundgaard, Lars Esben; Liu, Qiang; Lesaint, Olivier; Madshaven, Inge.
Dielectric Performance of Transformer Liquids–Summary of a CIGRE Study. IEEE Electrical Insulation Magazine 2023 ;Volume 39.(5)
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4 Madshaven, Inge; Enoksen, Henrik; Lundgaard, Lars Esben; Jaufer, Stefan; Krause, Christoph; Prasnikar, Borut; Mjelve, Asgeir.
Clamping pressure during step loading of power transformer with and without prior energisation. Cigre SC A2 & 6th International Colloquium "Transformer Research and Asset Management"; 2023-11-29 - 2023-12-02
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2022
5 Eberg, Espen; Meyer, Hans Kristian Hygen; Lundgaard, Lars Esben; Mjelve, Asgeir; Kyrkjeeide, Stig Erik Mælen.
On-line differential partial discharge measurements of condenser bushings on power transformers. I: CIGRE Session Proceedings 2022. CIGRE (Conseil international des grands réseaux électriques) 2022 ISBN 0-000-00001-9.
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6 Hestad, Øystein Leif Gurandsrud; Aakre, Torstein Grav; Bærug, Håvard; Lundgaard, Lars Esben.
Field Dependent Currents in n-Tridecane. I: 2022 IEEE 21st International Conference on Dielectric Liquids ICDL. IEEE (Institute of Electrical and Electronics Engineers) 2022 ISBN 978-1-6654-8491-6.
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7 Madshaven, Inge; Lundgaard, Lars Esben; Enoksen, Henrik; Jaufer, Stefan; Krause, Christoph; Prasnikar, Borut; Mjelve, Asgeir.
On-line Direct Clamping Pressure Monitoring of Power Transformer Windings. I: 2022 7th International Advanced Research Workshop on Transformers - ARWtr. IEEE (Institute of Electrical and Electronics Engineers) 2022 ISBN 978-84-09-45157-9. p. 115-120
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8 Semenov, Ivan; Folkestad, Ingrid Gunheim; Niayesh, Kaveh; Lundgaard, Lars Esben.
Characterization of defects in aluminum nitride substrates through partial discharge measurements. I: 2022 IEEE 4th International Conference on Dielectrics - ICD. IEEE (Institute of Electrical and Electronics Engineers) 2022 ISBN 978-1-6654-1833-1. p. 380-384
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9 Semenov, Ivan; Gunheim, Ingrid Folkestad; Niayesh, Kaveh; Meyer, Hans Kristian Hygen; Lundgaard, Lars Esben.
Investigation of Partial Discharges in AlN Substrates under Fast Transient Voltages. IEEE transactions on dielectrics and electrical insulation 2022 ;Volume 29.(2) p. 745-752
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2021
10 Linhjell, Dag; Lundgaard, Lars Esben.
A Setup for Measuring Bubbling from Paper in Transformer Oil under Simulated sudden Overload. I: 2021 IEEE Electrical Insulation Conference - EIC. IEEE 2021 ISBN 978-1-6654-1564-4. p. 572-575
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11 Lundgaard, Lars Esben; Lesaint, Cedric Michel; Madshaven, Inge; Hájek, Jan; Wolmarans, C.; Vukovic, D.; Wang, Z.; Liu, Q.; Tenbohlen, S.; Frotscher, R.; Schmitt, P; Bakija, B.; Singha, S; Gyore, A..
Dielectric performance of insulating liquids for transformers. CIGRE (Conseil international des grands réseaux électriques) 2021 (ISBN 978-2-85873-561-7) 130 p. CIGRE Technical Brochure(856)
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12 Meyer, Hans Kristian Hygen; Eberg, Espen; Lundgaard, Lars Esben.
On-line three-phase differential partial discharge localization in transformer bushings. I: 2021 IEEE Electrical Insulation Conference - EIC. IEEE 2021 ISBN 978-1-6654-1564-4. p. 80-83
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2020
13 Foros, Jørn; Tveten, Erlend Grytli; Liland, Knut Brede; Mehammer, Eirill Bachmann; Lundgaard, Lars Esben.
Transformer management by learning from condition, failure and scrapping data collected nationwide. CIGRE Session 2020; 2020-08-24
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14 Linhjell, Dag; Lundgaard, Lars Esben; Unge, M.; Hjortstam, Olof.
Pressure-Dependent Propagation of Streamers under Step Voltage in a long Point-Plane Gap in Transformer Oil. IEEE transactions on dielectrics and electrical insulation 2020 ;Volume 27.(5) p. 1595-1603
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15 Linhjell, Dag; Lundgaard, Lars Esben; Unge, Michael; Hjortstam, Olof.
Prebreakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 1: behaviour at positive polarity. Journal of Physics Communications 2020 ;Volume 4.(4) p. 1-22
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16 Lundgaard, Lars Esben; Linhjell, Dag; Hestad, Øystein Leif Gurandsrud; Unge, Michael; Hjortstam, Olof.
Pre-breakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 2: behaviour under negative polarity and comparison with positive polarity. Journal of Physics Communications 2020 ;Volume 4.(4) p. 1-20
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17 Tveten, Erlend Grytli; Lundgaard, Lars Esben.
FastTrans: Reducing the Impact of Repetitive Voltage Pulses on HV Components.
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2019
18 Linhjell, Dag; Lundgaard, Lars Esben; Unge, Mikael.
Pressure Dependent Propagation of Positive Streamers in a long Point-Plane Gap in Transformer Oil. I: 2019 IEEE 20th International Conference on Dielectric Liquids - ICDL. IEEE 2019 ISBN 978-1-7281-1718-8.
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19 Lundgaard, Lars Esben.
CIGRE Work on Impregnated Insulation Systems for Transformers. IEEE Electrical Insulation Magazine 2019 ;Volume 35.(6) p. 3-4
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20 Lundgaard, Lars Esben.
Editorial: CIGRE work on impregnated insulation systems for transformers. IEEE Electrical Insulation Magazine 2019 ;Volume 35.(6) p. 3-4
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21 Lundgaard, Lars Esben; Martins, M.A.; Martin, R.; Prevost, Thomas; Lessard, M.C.; Dreier, L.; Jian, L.; van Peteghem, J.; Lesaint, Cedric Michel; Bauchemin, C.; Pagger, E.; Jalbert, J.; Meltzer, L.; Atanasova-Höhlein, Ivanka; Perrier, C..
Ageing of liquid impregnated cellulose for power transformers. CIGRE (International Council on Large Electric Systems) 2019 (ISBN 978-2-85873-440-5) 92 p. CIGRE Technical Brochure(738)
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2018
22 Eberg, Espen; Ese, Marit-Helen Glomm; Lundgaard, Lars Esben.
Nytt superutstyr. Energiteknikk [Business/trade/industry journal] 2018-10-01
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2017
23 Aakre, Torstein Grav; Lundgaard, Lars Esben; Unge, Mikael.
Time to breakdown studies for liquids of different physico-chemical nature. I: 2017 IEEE 19th International Conference on Dielectric Liquids - ICDL. IEEE conference proceedings 2017 ISBN 978-1-5090-4877-9.
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24 Hestad, Øystein Leif Gurandsrud; Linhjell, Dag; Lundgaard, Lars Esben; Samseth, Jarl Ø.; Unge, Mikael.
Field dependent conductivity of n-pentane. I: 2017 IEEE 19th International Conference on Dielectric Liquids - ICDL. IEEE conference proceedings 2017 ISBN 978-1-5090-4877-9. p. -
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25 Liland, Knut Brede; Linhjell, Dag; Lesaint, Cedric Michel; Ese, Marit-Helen Glomm; Lundgaard, Lars Esben; Mavrommatis, Pascal; Stjepanovic, Nenad Miroljub.
Comparison between synthetic ester and mineral oil impregnated transformer paper aging markers. I: 2017 IEEE 19th International Conference on Dielectric Liquids - ICDL. IEEE conference proceedings 2017 ISBN 978-1-5090-4877-9.
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26 Linhjell, Dag; Lundgaard, Lars Esben; Unge, Mikael.
Positive third mode streamers in insulating oil. I: 2017 IEEE 19th International Conference on Dielectric Liquids - ICDL. IEEE conference proceedings 2017 ISBN 978-1-5090-4877-9.
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2016
27 Abdelmalik, Abdelghaffar Amoka; Borge, Malin Drevdal; Nysveen, Arne; Lundgaard, Lars Esben; Linhjell, Dag.
Statistical analysis of dielectric breakdown of liquid insulated printed circuit boards. IEEE transactions on dielectrics and electrical insulation 2016 ;Volume 23.(4) p. 2303-2310
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28 Abdelmalik, Abdelghaffar Amoka; Nysveen, Arne; Lundgaard, Lars Esben.
Partial discharges in liquid embedded power electronics: Effects of pressure and liquid nature under negative pulse voltage stress. IEEE transactions on dielectrics and electrical insulation 2016 ;Volume 23.(2) p. 1119-1125
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29 Fløystad, Jostein Bø; Pedersen, Atle; Mo, Olve; Hoidalen, Hans Kristian; Lundgaard, Lars Esben.
Risk and mitigation of geomagnetically induced currents in the power system : status report. Trondheim: SINTEF Energi AS 2016 (ISBN 978-82-594-3658-0) 26 p. SINTEF Energi. Rapport(TR A7574)
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30 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 ;Volume 23.(4) p. 2015-2020
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31 Liland, Knut Brede; Lesaint, Cedric Michel; Lundgaard, Lars Esben; Hernes, Magnar; Glomm, Wilhelm.
Liquid insulation of IGBT modules: Long term chemical compatibility and high voltage endurance testing. I: Proceedings of the 2016 IEEE International Conference on Dielectrics, 3-7 July 2016, University of Montpellier, France : ICD 2016. IEEE conference proceedings 2016 ISBN 978-1-5090-2804-7.
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32 Lundgaard, Lars Esben; Munkejord, Svend Tollak; Reboud, Jean-Luc; Lesaint, Cedric Michel; Ervik, Åsmund; Ese, Marit-Helen Glomm.
Electrocoalescence III : staus and summary report from activities. Trondheim: SINTEF Energi AS 2016 (ISBN 978-82-594-3768-6) 34 p. SINTEF Energi. Rapport(TR A7597)
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2015
33 Abdelmalik, Abdelghaffar Amoka; Nysveen, Arne; Lundgaard, Lars Esben.
Influence of fast rise voltage and pressure on partial discharges in liquid embedded power electronics. IEEE transactions on dielectrics and electrical insulation 2015 ;Volume 22.(5) p. 2770-2779
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34 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 ;Volume 56.(122)
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35 Lundgaard, Lars Esben; Liland, Knut Brede; Linhjell, Dag; Susa, Dejan; Ese, Marit-Helen; Selsbak, Cecilie Mørk; Kes, M; Lesaint, Cedric Michel.
Transformer Windings Ageing, diagnosis and asset management. Version 4. : SINTEF Energi 2015 (ISBN 978-82-594-3665-8) 63 p. SINTEF Energi. Rapport(TR A7099)
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2014
36 Abdelmalik, Abdelghaffar Amoka; Nysveen, Arne; Lundgaard, Lars Esben.
Partial Discharges in Narrow Gaps on Power Electronic Converter. I: 2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena - CEIDP. IEEE (Institute of Electrical and Electronics Engineers) 2014 ISBN 978-1-4799-7525-9. p. 31-34
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37 Davari, Nazanin; Åstrand, Per-Olof; Unge, Mikael; Lundgaard, Lars Esben; Linhjell, Dag.
Field-dependent molecular ionization and excitation energies: Implications for electrically insulating liquids. AIP Advances 2014 ;Volume 4.(3)
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38 Grav, Torstein; Lundgaard, Lars Esben.
Currents in AC stressed liquid insulated needle plane gap. I: 2014 IEEE 18th International Conference on Dielectric Liquids ICDL. Curran Associates, Inc. 2014 ISBN 9781479920655.
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39 Grav, Torstein; Lundgaard, Lars Esben.
PD occurrence in liquids in ac stressed needle plane gap. I: 2014 IEEE 18th International Conference on Dielectric Liquids ICDL. Curran Associates, Inc. 2014 ISBN 9781479920655.
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40 Hestad, Øystein Leif; Grav, Torstein; Lundgaard, Lars Esben; Ingebrigtsen, Stian; Unge, M.; Hjortstam, O..
Numerical simulation of positive streamer propagation in cyclohexane. I: 2014 IEEE 18th International Conference on Dielectric Liquids ICDL. Curran Associates, Inc. 2014 ISBN 9781479920655.
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41 Lesaint, Cedric Michel; Babault, Celine; Liland, Knut Brede; Lundgaard, Lars Esben.
Absorption of water in silicon gel. I: 2014 IEEE 18th International Conference on Dielectric Liquids ICDL. Curran Associates, Inc. 2014 ISBN 9781479920655.
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42 Nguyen, Dung Van; Linhjell, Dag; Lundgaard, Lars Esben; Høidalen, Hans Kristian; Unge, M..
Effects of spatial restriction on streamers in white oil. I: 2014 IEEE 18th International Conference on Dielectric Liquids ICDL. Curran Associates, Inc. 2014 ISBN 9781479920655.
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43 Tønseth, Svein; Lundgaard, Lars Esben; Nordhagen, Håkon Ottar.
Vil hindre trafo-smell. Gemini [Internet] 2014-10-16
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44 Unge, M.; Singha, S; Ingebrigtsen, Stian; Linhjell, Dag; Lundgaard, Lars Esben.
Influence of molecular additives on positive streamer propagation in ester liquids. I: 2014 IEEE 18th International Conference on Dielectric Liquids ICDL. Curran Associates, Inc. 2014 ISBN 9781479920655.
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2013
45 Davari, Nazanin; Åstrand, Per-Olof; Unge, Michael; Lundgaard, Lars Esben; Linhjell, Dag.
Field-dependent ionization potentials and excitation energies of molecules of relevance for electrically insulating liquids. I: 2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena - CEIDP. IEEE Press 2013 ISBN 978-1-4799-2597-1. p. 651-654
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46 Davari, Nazanin; Åstrand, Per-Olof; Unge, Mikael; Lundgaard, Lars Esben; Linhjell, Dag.
Field-Dependent Ionization Potentials and Excitation Energies of Molecules of Relevance for Electrically Insulating Liquids. 2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena; 2013-10-20 - 2013-10-23
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47 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 ;Volume 27.(1) p. 75-81
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48 Linhjell, Dag; Ingebrigtsen, Stian; Lundgaard, Lars Esben; Unge, Michael.
Positive Breakdown Streamers and Acceleration in a Small Point-Plane Liquid Gap and Their Variation with Liquid Properties. I: Proceedings of the 23rd Nordic Insulation Symposium - NORDI-IS13. Akademika forlag 2013 ISBN 978-82-321-0274-7. p. 191-196
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49 Nguyen, Dung Van; Høidalen, Hans Kristian; Linhjell, Dag; Lundgaard, Lars Esben; Unge, Michael.
Effects of reduced pressure and additives on streamers in white oil in long point-plane gap. Journal of Physics D: Applied Physics 2013 ;Volume 46.(25)
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50 Nguyen, Dung Van; Høidalen, Hans Kristian; Linhjell, Dag; Lundgaard, Lars Esben; Unge, Michael.
Influence of impurities and additives on negative streamers in paraffinic model oil. IEEE transactions on dielectrics and electrical insulation 2013 ;Volume 20.(3) p. 876-886
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