An Innovative Shielding Strategy for Stray Loss Reduction of Neutral Grounding Reactor

Nikkhoo, Mohsen; Nasab, Mohammad Rajabi; Hosseini, Abbas

doi:10.1109/tmag.2022.3179596

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…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

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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.

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