Publikasjoner og ansvarsområder
Ripple Field AC Losses in 10-MW Wind Turbine Generators With a MgB2 Superconducting Field Winding
Superconducting (SC) synchronous generators are proposed as a promising candidate for 10–20-MW direct-drive wind turbines because they can have low weights and small sizes. A common way of designing an SC machine is to use SC wires with high current-carrying capability in the dc field winding and th...
Optimale elektriske kontakter
Design aspects on winding of an MgB2 superconducting generator coil
Generators based on superconducting rotor coils are considered for future large off-shore wind turbines for their low weight and compact design, and for their possibility to reduce costs. In the 10-20 K temperature range, MgB2 superconductors carry current densities 100 times higher than standard co...
Cavity formation in mass-impregnated HVDC subsea cables-mechanisms and critical parameters
Challenges and opportunities in preventing bird electrocution in Coastal Norway
Norway has approximately 165 000 km of overhead power lines in the distribution grid system, thus numerous structures are representing a high electrocution hazard to birds. With its long coastline and scattered human population, a significant part of the grid is located in marine environments with h...
A Method to Estimate the Necessary Twist Pitch in Multi-filamentary Superconductors
Twisting of multi-filamentary superconductors is an important step in the development of wires with AC losses at an acceptable level for AC applications. The necessary twist pitch depends on wire architecture, critical current density, matrix material, and external factors such as temperature, frequ...
Hysteresis losses in MgB2 superconductors exposed to combinations of low AC and high DC magnetic fields and transport currents
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 load, which must be removed by the cooling system. These losses must be evalua...
Laboratory corrosion tests on overhead line conductors with bird protection systems
Coupling currents and hysteresis losses in MgB2superconductors
MgB2 multi-filamentary superconductors are widely considered for use in dc applications. To expand the possible application range to ac apparatuses, the development of a low ac loss wire is needed. This development involves several steps, and a solid understanding of the loss mechanisms is important...