Browsing Institutt for elkraftteknikk by Author "Wang, Wei"
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Apparatus for loss measurements under multidirectional and dc-bias flux in electrical steel laminations
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2020)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 ... -
Common and differential mode of dc-bias in three-phase power transformers
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2022)Dc magnetization due to the geomagnetically induced currents (GICs) and HVDC (High Voltage Direct Current) systems may cause core saturation and result in serious destruction in the transformer performance as well as the ... -
Eddy Current Loss in Grain-Oriented Steel Laminations due to Normal Leakage Flux
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2021)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 ... -
Electromagnetic field calculation and power loss evaluation in power transformers - Analysis of Leakage Fields and Stray Losses under Special Operation Conditions
Wang, Wei (Doctoral theses at NTNU;2022:395, Doctoral thesis, 2022)The PhD research work presented in this thesis deals with electromagnetic field calculation and loss evaluation in power transformers under special operation conditions. The special loading conditions under investigation ... -
Fourier-based effective permeability for transformer iron losses computation under saturation
Wang, Wei; Nysveen, Arne; Magnusson, Niklas; Nilssen, Robert (Journal article; Peer reviewed, 2020)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 ... -
The influence of multidirectional leakage flux on transformer core losses
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2021)In a power transformer, the leakage flux enters the laminations of the iron core in different directions. Depending on the orientation of the leakage flux, it can add eddy current and hysteresis losses to the well-documented ... -
Power losses in the three-phase three-limb transformer due to common and differential mode of dc-bias
Wang, Wei; Nysveen, Arne; Magnusson, Niklas (Peer reviewed; Journal article, 2021)Geomagnetically induced currents (GICs) and the converter modulation effect are the two main causes for dc magnetisation in power transformers. It is well known that a small dc-bias can saturate a large transformer and ...