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Niklas Magnusson

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Niklas Magnusson

Seniorforsker

Niklas Magnusson
Telefon: 907 18 577
E-post:
Avdeling: Elkraftteknologi
Kontorsted: Trondheim

Publikasjoner og ansvarsområder

Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1918843/

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 what is needed for the field windings of a 10 MW direct drive wind turbine...

Forfattere Niklas Magnusson Svein Magne Hellesø R. Mikkonen A.B. Abrahamsen Magne E Runde Gunnar Berg-Karlsen Arne Nysveen
År 2021
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1915878/

Thermal expansion and contraction of the impregnation oil (the “mass”) in mass-impregnated non-draining HVDC cables cause the internal pressure to vary greatly during load changes. Pressure drops after load turn-off is a concern since formation of shrinkage cavities may reduce the dielectric...

År 2021
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1902944/

Leakage flux penetrating laminated iron cores in power transformers and large generators induces eddy current and local loss. Due to the strong magnetic anisotropy of the lamination structure, the penetrating flux tends to saturate the lamination in its plane, even when the incident stray flux...

Forfattere Wei Wang Arne Nysveen Niklas Magnusson
År 2021
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1891848/

Computation of iron losses in transformers requires significant numerical efforts, particularly under magnetic saturation when the magnetic non-linearity needs to be considered. This study proposes a Fourier method to calculate the magnetic flux density used for the iron loss evaluation in...

Forfattere Wei Wang Arne Nysveen Niklas Magnusson Robert Nilssen
År 2020
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1829987/

Conventional standardized power loss measurements for electric steels are performed at flux densities with a single sinusoidal and unidirectional excitation. However, the flux inside electrical steel laminations can deviate significantly from the standard condition, and the loss is sensitive to such...

Forfattere Wei Wang Arne Nysveen Niklas Magnusson
År 2020
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1812951/

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 °C. Thermal expansion of the mass gives in some cases rather extreme internal...

År 2020
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1840599/

Tests have been performed to evaluate a draft cable screen connection test procedure. The tested objects were cable screen connections for cables with both an aluminium laminate and copper strands in the screen. The test revealed the importance of using good equalizers to obtain usable results...

Forfattere Niklas Magnusson Kristian Solheim Thinn Yngve Lervåg
År 2019
Type Rapport
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1702275/

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 measurements at different ambient temperatures, both under isothermal...

Forfattere Magne E Runde Oddgeir Kvien Horst H. Förster Niklas Magnusson
År 2019
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1573795/

A method for comparing the Levelized Cost of Energy (LCoE) of different superconducting drive trains is introduced. The properties of a 10 MW MgB$_{2}$ superconducting direct drive generator are presented in terms weight scaled to a turbine with a rotor diameter up of...

Forfattere Asger B Abrahamsen Dong Liu Niklas Magnusson Arwyn Sean Thomas Ziad Azar Ewoud Stehouwer Ben Hendriks Gerrit Jan Van Zinderen Fujin Deng Zhe Chen Dennis Karwatzki Axel Mertens Max Alexander Parker Stephen Jon Finney Henk Polinder
År 2018
Type Vitenskapelig artikkel
Publikasjon
https://www.sintef.no/publikasjoner/publikasjon/1573249/

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 full-scale generators, tests of different winding methodologies and techniques...

Forfattere Niklas Magnusson Jan Christian Eliassen Asger Bech Abrahamsen Svein Magne Hellesø Magne E Runde Arne Nysveen Lars-Erik Moslått Jarle Bjerkli Patrick King
År 2018
Type Vitenskapelig artikkel