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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...
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...
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...
Design of an MgB2 race track coil for a wind generator pole demonstration
An MgB2 race track coil intended for demonstrating a down scaled pole of a 10 MW direct drive wind turbine generator has been designed. The coil consists of 10 double pancake coils stacked into a race track coil with a cross section of 84 mm × 80 mm. The length of the straight section is 0.5 m and t...
Cavity formation in mass-impregnated HVDC subsea cables-mechanisms and critical parameters
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...