Alternative model for computing transformer tank induced losses in the time domain

Oliveira, Luiz Fernando de; Sadowski, N.; Cabral, Sergio H. L.

doi:10.1049/iet-epa.2020.0275

Cited by 2 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent advances in research focuses on various aspects of stray losses within transformer tanks. These studies employ a variety of methodologies, including numerical techniques such as the finite element method, as well as analytical and experimental approaches [1][2][3][4][5][6]. In this work, stray magnetic field refers to the dispersion magnetic field that reaches the tank and core clamp, and that produces stray losses in them.…”

Section: Introductionmentioning

confidence: 99%

Analysing and Computing the Impact of Geometric Asymmetric Coils on Transformer Stray Losses

Hernandez-Robles,

Gonzalez-Ramirez,

Olivares-Galvan

et al. 2024

ASI

View full text Add to dashboard Cite

Designing and manufacturing transformers often involves variations in heights and thicknesses of windings. However, such geometric asymmetry introduces a significant impact on the magnitude of stray transformer losses. This study examines the effects of asymmetric coils on the generation of stray losses within core clamps and transformer tank walls. A model has been introduced to ascertain the dispersion magnetic field’s value at a specific distance from the coil. The analysis extends to characterising the dispersion magnetic field reaching the tank walls by using electromagnetic simulation by a finite element method. It explores strategies to diminish stray losses, including the placement of magnetic shunts as protective shields for the tank walls. It delves into the efficacy of employing a transformer shell-type configuration to mitigate the magnetic dispersion field. The findings revealed that achieving greater symmetry in transformer coils can minimise stray losses. Specifically, the incorporation of magnetic shunts has the potential to reduce additional losses by 40%, while the adoption of a shell-type configuration alone can lead to a 14% reduction. This work provides valuable insights into optimising transformer designs, contributes a user-friendly tool for estimating additional tank losses, thereby enhancing the knowledge base for transformer manufacturers.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysing and Computing the Impact of Geometric Asymmetric Coils on Transformer Stray Losses

Hernandez-Robles,

Gonzalez-Ramirez,

Olivares-Galvan

et al. 2024

ASI

View full text Add to dashboard Cite

show abstract

“…Analytical and numerical models can be employed for the design of the transformer taking into account the well-known advantages of each one: analytic models provide accuracy, less calculation time and simplicity once the model has been developed, whereas numeric models allow one to solve complex geometries and deal with nonlinear materials. Several research works, analyzing the magnetic field distribution and the eddy current power losses in the bushing transformer region, using either numerical or analytical models, have been carried out previously [1,[4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…However in this research the presence of harmonics in the current is considered. Oliveira et al [15] developed a time domain model to determine the eddy currents in the transformer tank walls considering different types of excitations. The results obtained with the proposed model were validated with a 3D FE solution.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Calculation of Stray Losses in Transformer Tanks with a Stainless Steel Insert

et al. 2021

View full text Add to dashboard Cite

At present it is claimed that all electrical energy systems operate with high values of efficiency and reliability. In electric power systems (EPS), electrical power and distribution transformers are responsible for transferring the electrical energy from power stations up to the load centers. Consequently, it is mandatory to design transformers that possess the highest efficiency and reliability possible. Considerable power losses and hotspots may exist in the bushing region of a transformer, where conductors pass through the tank. Most transformer tanks are made of low-carbon steel, for economical reasons, causing the induction of high eddy currents in the bushing regions. Using a non-magnetic insert in the transformer tank can reduce the eddy currents in the region and as a consequence avoid overheating. In this work, analytical formulations were developed to calculate the magnetic field distribution and the stray losses in the transformer region where bushings are mounted, considering a stainless steel insert (SSI) in the transformer tank. Previously, this problem had only been tackled with numerical models. Several cases were analyzed considering different non-magnetic insert sizes. Additionally, a numerical study using a two dimensional (2D) finite element (FE) axisymmetric model was carried out in order to validate the analytical results. The solved cases show a great concordance between models, obtaining relative errors between the solutions of less than two percent.

show abstract

Alternative model for computing transformer tank induced losses in the time domain

Cited by 2 publications

References 11 publications

Analysing and Computing the Impact of Geometric Asymmetric Coils on Transformer Stray Losses

Analysing and Computing the Impact of Geometric Asymmetric Coils on Transformer Stray Losses

Mathematical Calculation of Stray Losses in Transformer Tanks with a Stainless Steel Insert

Contact Info

Product

Resources

About