Optimization of Magnetic Shunts Towards Efficient and Economical Power Transformers Design

Al-Abadi, Ali; Gamil, Ahmed; Schatzl, F.

doi:10.1007/978-3-030-31676-1_2

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Apart from optimization based on the calculated field values, in some cases, the collector geometry parameters are chosen following specific guidelines. Reference [8] suggests that using empirical equations during the design phase is preferable due to the low computation time required. It also proposes design rules for tank shields and yoke shunts.…”

Section: Introductionmentioning

confidence: 99%

Multi-Step Approach for Fast Calculation of Magnetic Field in Transformer Tank Shields

Jurković,

Jurišić,

Župan

2024

Energies

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A multi-step approach for the fast calculation of the magnetic field inside transformer tank shields, based on the 2D FEM, is presented in the paper. Due to the limitations of the 2D FEM, the proposed approach utilizes several 2D FEM models and calculates the magnetic field in multiple steps to account for the 3D geometry of the problem. In the first step, a distribution of the magnetic flux density that enters the tank shields is calculated using the quasi-3D model of the transformer. This quasi-3D model is obtained by superimposing the solution of multiple axisymmetric 2D FEM models, and assumes a considerably simplified transformer geometry. To account for the tank shield geometry that is neglected in the quasi-3D FEM model, an additional 2D FEM model with tank shields is introduced. After the distribution of the magnetic flux density that enters the tank shields is calculated, it is imposed in the final 2D FEM model with a non-linear tank shield which is used to calculate the magnetic flux density distribution inside the tank shields. The proposed approach enables a fast calculation of magnetic field distributions, both in the vertical and horizontal directions. The results of the proposed approach are compared against the 3D FEM. The relative error of the maximum magnetic flux density is under 2%, while the NRMSE of the magnetic flux density distribution within the tank shields is under 10%. The key contribution of the proposed approach is a low computation time. In the presented case study, the total computation time of the proposed approach is ~30 s, while the computation time of the 3D FEM is ~1 h. As the computation time is significantly reduced, while the accuracy is acceptable, the proposed approach can be a good alternative to the 3D FEM for design purposes. Therefore, it has industrial value.

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Section: Introductionmentioning

confidence: 99%

Multi-Step Approach for Fast Calculation of Magnetic Field in Transformer Tank Shields

Jurković,

Jurišić,

Župan

2024

Energies

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“…Most of the studies found that there was electrostatic field calculation and optimization structure in power transformer bushing insulation, while some studies such as [11,12] found that there was condition assessment of high voltage bushing with solid insulation structure. Some studies such as [13,14] have found that electromagnetic forces and losses computation and design of power transformer bushings. By applying theory of electric field optimization based on charge simulation method, the author developed a computation program for electric field automatic optimization of an electrode profile with 3D dielectrics in axisymmetric field.…”

Section: Introductionmentioning

confidence: 99%

Finite difference method for electric field optimization in high voltage power transformer bushings using engineering simulation and 3D design program

Pamuk

2021

International Advanced Researches and Engineering Journal

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The electric field optimization minimizing the field strength on an electrode surface and providing its uniformity is important in designing high voltage power transformer bushings and other apparatus from the viewpoint of efficient utilization of the electric field space. The high voltage power transformer bushing with cylinder electrode system has been designed and tested in this investigation. It was found that the insulation method of the cylinder electrode was the most important factor to lower streamer initiation voltage. The optimized design uses both internal and external elements for electric stress grading at critical parts of the bushing. Applying optimization theory based on charge simulation method, the author developed a computation program for electric field automatic optimization in 3D dielectric axisymmetric field. The results of the computation realized some excellent electrode profiles with uniform electric field distribution. Moreover, the discrepancy from the electric field uniformity on 3D dimensional profile caused by applying it to an axisymmetric electrode was discussed. Then a new electrode with uniform field distribution was obtained by using the computation program for optimization.

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Determining the Positions and Dimensions of Horizontal Magnetic Shunts in Transformer Tank Walls Using Parametric Analyses Based on the Finite Element Method

Çeçen,

Gümüş,

Hazar

2024

Applied Sciences

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Magnetic shunts efficiently mitigate losses caused by leakage currents in the tank walls of power transformers. Transformer manufacturers frequently utilize vertical magnetic shunts positioned on the inside surfaces of the transformer tank walls. This study investigated the optimum use of horizontal shunts in a power transformer. A 50 MVA power transformer, manufactured on a commercial scale and featuring optimized vertical magnetic shunts integrated into the wall structure, was analyzed using the 3D finite element method for 100 ms at full load. Simulations for analyses were performed using a commercial ANSYS Electronics Desktop 2021 R1 FEM software program. The model’s validity was demonstrated by verifying the analysis results with experimental tank loss values. Tank loss samples were obtained by analyzing the transformer tank for two milliseconds with vertical magnetic shunts only on the long front wall and the short side wall. Using these loss samples as a reference, parametric analyses were performed for two milliseconds with horizontal magnetic shunts only on the short side wall and only on the long front wall of the tank. A tank model with horizontal magnetic shunts of an appropriate location and size was obtained via the parametric analyses. This model was analyzed for 100 milliseconds at full load and compared with the experimental results of the transformer manufacturer’s vertical magnetic shunt transformer. According to the results, a saving of 25.83% was achieved in the horizontal magnetic shunt volume compared with the vertical magnetic shunt volume. The maximum magnetic flux density was lower in the horizontal magnetic shunts, and the maximum current density was lower in the transformer tank with horizontal magnetic shunts.

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Optimization of Magnetic Shunts Towards Efficient and Economical Power Transformers Design

Cited by 3 publications

References 15 publications

Multi-Step Approach for Fast Calculation of Magnetic Field in Transformer Tank Shields

Multi-Step Approach for Fast Calculation of Magnetic Field in Transformer Tank Shields

Finite difference method for electric field optimization in high voltage power transformer bushings using engineering simulation and 3D design program

Determining the Positions and Dimensions of Horizontal Magnetic Shunts in Transformer Tank Walls Using Parametric Analyses Based on the Finite Element Method

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