Browsing SINTEF Open by Author "Runde, Magne"
Now showing items 1-16 of 16
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Air Flow Measurements During Medium-Voltage Load Current Interruptions
Aanensen, Nina Sasaki; Runde, Magne (Journal article; Peer reviewed, 2015)Air has been considered a good alternative to SF6 as arc quenching medium for load break switchgear at medium voltage ratings. In this work, the air flow characteristics and influence from the electric arc have been studied ... -
Arc extinction with nitrogen at 1-40 bar in a puffer-like contact configuration
Støa-Aanensen, Nina Sasaki; Espedal, Camilla; Rokseth, Oddgeir; Jonsson, Erik; Runde, Magne (Peer reviewed; Journal article, 2021)To develop cost-efficient subsea switchgear for large sea depths, the extinction of arcs under high filling pressures must be understood. In this work, arc-extinction experiments have been performed with a puffer-like ... -
Cavities in Mass-Impregnated HVDC Subsea Cables Studied by AC Partial Discharge Measurements
Runde, Magne; Kvien, Oddgeir; Førster, Horst H.; Magnusson, Niklas (Journal article; Peer reviewed, 2019)Partial discharge measurements have been used for studying shrinkage voids in the insulation of mass-impregnated high voltage DC subsea power cables. Three 4.5-m long cable samples were subjected to ac partial discharge ... -
Comparison of Different Air Flow Concepts for a Medium Voltage Load Break Switch
Støa-Aanensen, Nina Sasaki; Jonsson, Erik; Runde, Magne (Journal article; Peer reviewed, 2019)The research and development work towards a compact SF6-free load break switch for the medium voltage range has led to several design proposals. The interruption capability of three different nozzle and gas flow concepts ... -
Contact and nozzle wear from 100 interruptions for a puffer-type air load break switch
Støa-Aanensen, Nina Sasaki; Jonsson, Erik; Runde, Magne (Journal article; Peer reviewed, 2017)One type test requirement for medium voltage load break switches is to interrupt 100 consecutive "mainly active loads". A puffer-type switch with axial-blown arc has been tested according to the 630 A/24 kV ratings. The ... -
Design Aspects on Winding of an MgB2 Superconducting Generator Coil
Magnusson, N.; Eliassen, J.C.; Abrahamsen, A.B.; Nysveen, A.; Bjerkli, Jarle; Runde, Magne; King, Patrick (Journal article; Peer reviewed, 2015) -
Experimental investigation on ablation-assisted current interruption - Experimental setup and preliminary results
Taxt, Henning; Niayesh, Kaveh; Jonsson, Erik; Runde, Magne (Chapter, 2016)This paper presents a flexible setup to investigate ablation-assisted interruption of load currents. The electrical test circuit is grid connected with a transformer secondary voltage from 6.9 kV to 24 kV. The applied ... -
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 ... -
Hysteresis losses in MgB2 superconductors exposed to combinations of low AC and high DC magnetic fields and transport currents
Magnusson, Niklas; Abrahamsen, A.B.; Liu, D; Runde, Magne; Polinder, Henk (Peer reviewed; Journal article, 2014)MgB2 superconductors are considered for generator field coils for direct drive wind turbine generators. In such coils, the losses generated by AC magnetic fields may generate excessive local heating and add to the thermal ... -
Inside the aluminum contact spot
Runde, Magne (Chapter; Peer reviewed, 2019)The electrical properties of a power connector – such as the resistance during its service life – depend on the number, size and quality of the tiny contact spots (“a-spots”) where the current crosses the contact interface. ... -
Internal pressures and pressure gradients in mass-impregnated HVDC cables during current cycling
Runde, Magne; Jonsson, Erik; Magnusson, Niklas; Solheim, Kristian Thinn (Peer reviewed; Journal article, 2020)The internal pressures in the insulation of two 5-m long pieces of a state-of-the art mass-impregnated non-draining subsea cable have been measured under load current cycling at ambient temperatures ranging from 3 to 37 ... -
Medium voltage load current interruption in presence of ablating polymer material
Taxt, Henning; Niayesh, Kaveh; Runde, Magne (Journal article; Peer reviewed, 2018) -
Modelling of Internal Pressure Dynamics in Mass-Impregnated Non-Draining HVDC Cables
Hestad, Øystein Leif Gurandsrud; Runde, Magne; Enoksen, Henrik; Magnusson, Niklas (Peer reviewed; Journal article, 2022)Changing the current loading of mass-impregnated non-draining power cables causes the pressure in the insulation to vary over a wide range. It is generally recognized that under certain conditions—typically after a large ... -
Self-blast Current Interruption and Adaption to Medium Voltage Load Current Switching
Taxt, Henning; Niayesh, Kaveh; Runde, Magne (Journal article; Peer reviewed, 2019)Ablation-assisted current interruption is a candidate for improving interruption capability in medium voltage switchgear. In high voltage switchgear, ablation is utilized to achieve high pressures in self-blast circuit ... -
SF6 Emissions from a National Population of High-Voltage Switchgear
Runde, Magne; Istad, Maren Kristine (Peer reviewed; Journal article, 2023)Twenty years of careful recordings of SF6 inventories and emissions from a large switch-gear population show that by implementing appropriate measures, annual emission rates as low as 0.2% can be achieved. Key words: sulfur ... -
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 ...