Browsing NTNU Open by Author "Hellesø, Svein Magne"
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Condition Assessment of Line Connectors by Current Pulse Measurements: Design and Testing of a LightweightCurrent Pulse Source Prototype
Fandrem, Knut (Master thesis, 2014)This thesis presents and discusses the development, design and testing of a lightweight current pulse source prototype used for condition assessment of line connectors. The thesis is a continuation of a student project ... -
Dynamic analysis and monitoring of power transmission cables using fibre optic sensors
Hellesø, Svein Magne (Doktoravhandlinger ved NTNU, 1503-8181; 2005:203, Doctoral thesis, 2005)Aeolian vibration is a well known phenomen that can occur on overhead power lines in light to moderate steady winds. The amplitude of these vibrations is usually less than the conductor diameter, while the frequency, ... -
Eddy current losses in transformer windings
Waagan, Marianne (Master thesis, 2020)Målet med denne masteroppgaven er å undersøke en semi-analytisk tapberegningsmetode, spesielt når man tar hensyn til virvelstrømstap i transformatorviklinger. Dette gjøres gjennom sammenligninger mellom simulerte og målte ... -
Effect of cyclic mechanical stress on the material properties of silicone rubber for HV subsea cable applications
Kayanja, Oscar; Kantar, Emre; Hellesø, Svein Magne; Hvidsten, Sverre; Glaum, Julia; Einarsrud, Mari-Ann (Chapter, 2024)Silicone rubber (SiR), widely used in high-voltage cable accessories, is subjected to cyclic mechanical stress arising from operational expansion and contraction, which may affect material properties, performance, and ... -
Experimental and computational studies of water drops falling through model oil with surfactant and subjected to an electric field
Ervik, Åsmund; Hellesø, Svein Magne; Munkejord, Svend Tollak; Müller, Bernhard (Chapter, 2014)The behaviour of a single sub-millimetre-size water drop falling through a viscous oil while subjected to an electric field is of fundamental importance to industrial applications such as crude oil electrocoalescers. ... -
Fabrication of a scaled MgB2 racetrack demonstrator pole for a 10 MW direct drive wind turbine generator
Magnusson, Niklas; Eliassen, J. C.; Abrahamsen, Asger B; Hellesø, Svein Magne; Runde, Magne; Nysveen, Arne; Moslått, Lars-Erik; Bjerkli, Jarle; King, Patrick (Journal article; Peer reviewed, 2018)Field windings made of MgB2 wires or tapes are considered for their potential to reduce volume, weight and cost of large offshore wind turbine generators. To gain experience of how to use this relatively new material in ... -
Influence of surfactants on the electrohydrodynamic stretching of water drops in oil
Ervik, Åsmund; Penne, Torstein Eidsnes; Hellesø, Svein Magne; Munkejord, Svend Tollak; Müller, Bernhard (Journal article; Peer reviewed, 2017)In this paper we present experimental and numerical studies of the electrohydrodynamic stretching of a sub-millimetre-sized salt water drop, immersed in oil with added non-ionic surfactant, and subjected to a suddenly ... -
Testing of an MgB2 coil for a wind turbine generator pole
Magnusson, Niklas; Hellesø, Svein Magne; Mikkonen, R.; Abrahamsen, A.B.; Runde, Magne; Berg, Gunnar; Nysveen, Arne (Peer reviewed; Journal article, 2021)We report on the testing of a 1 m long and 0.5 m wide racetrack coil wound from 4.5 km of MgB2 tape-shaped superconductors with a copper strip soldered to the nickel matrix. The cross-section of the coil corresponds to ...