The influence of multidirectional leakage flux on transformer core losses

Wang, Wei; Nysveen, Arne; Magnusson, Niklas

doi:10.1016/j.jmmm.2021.168370

Cited by 4 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Flux linkage depends on the conductor's geometry and the quantity of flux contained in it. In the gap between windings is the maximum flux linkage [60][61][62].…”

Section: Losses In Magnetic Componentsmentioning

confidence: 99%

Power Losses Models for Magnetic Cores: A Review

et al. 2022

View full text Add to dashboard Cite

In power electronics, magnetic components are fundamental, and, unfortunately, represent one of the greatest challenges for designers because they are some of the components that lead the opposition to miniaturization and the main source of losses (both electrical and thermal). The use of ferromagnetic materials as substitutes for ferrite, in the core of magnetic components, has been proposed as a solution to this problem, and with them, a new perspective and methodology in the calculation of power losses open the way to new design proposals and challenges to overcome. Achieving a core losses model that combines all the parameters (electric, magnetic, thermal) needed in power electronic applications is a challenge. The main objective of this work is to position the reader in state-of-the-art for core losses models. This last provides, in one source, tools and techniques to develop magnetic solutions towards miniaturization applications. Details about new proposals, materials used, design steps, software tools, and miniaturization examples are provided.

show abstract

“…Flux linkage depends on the conductor's geometry and the quantity of flux contained in it. In the gap between windings is the maximum flux linkage [60][61][62].…”

Section: Losses In Magnetic Componentsmentioning

confidence: 99%

Power Losses Models for Magnetic Cores: A Review

et al. 2022

View full text Add to dashboard Cite

show abstract

“…According to Faraday's law of electromagnetic induction, the circulation will be induced in the short circuit ring, and the reverse magnetic flux will be generated to prevent the change of the magnetic flux induced by the current of the regulator leads. When the current is large and the section of the structural part is small, it will cause the structural part to overheat due to high electrical density [8][9][10] .…”

Section: Basic Product Parametersmentioning

confidence: 99%

Study on product structure of 8 GW converter transformer for 800 kV flexible HVDC

Wang,

Chai,

Liang

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Based on the design scheme of ±800 kV 8 GW flexible DC converter transformer, given the large magnetic leakage loss caused by a large number of voltage regulating leads, this paper proposes an improvement measure to add a compensating copper plate to the core plate at the side of the voltage regulating leads. It calculates the structural parts with the help of magnetic field analysis software MagNet. The analysis shows that the compensation copper plate can reduce the loss of structural parts and control the local overheating caused by magnetic leakage.

show abstract

“…In certain cases, th netic field in certain areas of the core at the ends of the transformer windings can regarded as a one-dimensional field when the winding currents are significantly than the rated values. Consequently, the leakage flux near air indicates high value altering the direction of the field strength and flux density in the aforementione ments of the core [10]. Determining the changes in the flux density at the corners of the transformer cores, particularly in the areas of column connections with yokes (T-joint points) in three-phase transformers, is difficult.…”

Section: Description Of Magnetization Process In Transformer Steel Sh...mentioning

confidence: 99%

“…In certain cases, the magnetic field in certain areas of the core at the ends of the transformer windings cannot be regarded as a one-dimensional field when the winding currents are significantly higher than the rated values. Consequently, the leakage flux near air indicates high values, thus altering the direction of the field strength and flux density in the aforementioned fragments of the core [10]. In these areas, the core temperature is typically higher than that in other sections o the transformer core.…”

Section: Description Of Magnetization Process In Transformer Steel Sh...mentioning

confidence: 99%

Determination of Changes in Flux Density of Transformer Steel Sheets

Mazgaj,

Sierzega,

Tomczyk

2023

Energies

View full text Add to dashboard Cite

Magnetic fields in transformer cores are typically assumed to be one-dimensional fields, thus allowing magnetization processes to be regarded as axial magnetization. However, in the core corners or T-joint points of medium- and high-power rating transformers, the magnetic lines have different directions with respect to the rolling direction. This paper describes a method that allows changes in the flux density of transformer steel sheets to be calculated for any magnetization direction. These changes are assumed to depend only on certain limiting hysteresis loops assigned separately to the rolling and transverse directions of a tested transformer sheet, where these loops depend on the magnetization direction on the sheet plane. The selection of coefficients that define the limiting hysteresis loops for several magnetization directions is described, and the condition for the flux density saturation is considered. The resultant flux density in a specified magnetization direction is the geometric sum of the corresponding flux densities assigned to both the rolling and transverse directions. The limiting and partial hysteresis loops determined based on the proposed method for several magnetization directions are compared with analogous measured loops. Additionally, a comparison of the calculated hysteresis loops with loops showing changes in the resultant flux density for several magnetization direction is presented.

show abstract

The influence of multidirectional leakage flux on transformer core losses

Cited by 4 publications

References 16 publications

Power Losses Models for Magnetic Cores: A Review

Power Losses Models for Magnetic Cores: A Review

Study on product structure of 8 GW converter transformer for 800 kV flexible HVDC

Determination of Changes in Flux Density of Transformer Steel Sheets

Contact Info

Product

Resources

About