Balancing Current Distribution in Parallel Windings of Furnace Transformers Using the Genetic Algorithm

Nabaei, Vahid; Mousavi, Saeed; Miralikhani, K.; Mohseni, Hossein

doi:10.1109/tmag.2009.2031980

Cited by 16 publications

(15 citation statements)

References 6 publications

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“…As seen from the above table, the differences between the current density distributions in the central coils between the measured [17], calculated [17] and those determined by using our finite element model are very small. Still, there are differences both A1.…”

Section: Appendix Amentioning

confidence: 67%

“…Having no opportunity to build up and measure the current distribution in the parallel coils of a real FT. Our work was based on a reference paper [17]. This helped us to test our analytical approach with confirmation using the time-domain finite-element method and finally to demonstrate correctness of the method.…”

Section: Appendix Amentioning

confidence: 99%

“…Still, there are differences both A1. Cross section of the used axis-symmetric geometry of the transformer window [17].…”

Section: Appendix Amentioning

confidence: 99%

See 2 more Smart Citations

Current distribution in the low-voltage winding of the furnace transformer

Stojčić

Miljavec

2012

International Journal of Electrical Power & Energy Systems

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Section: Appendix Amentioning

confidence: 67%

Section: Appendix Amentioning

confidence: 99%

See 1 more Smart Citation

Current distribution in the low-voltage winding of the furnace transformer

Stojčić

Miljavec

2012

International Journal of Electrical Power & Energy Systems

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“…wires (8) (17) (18) . Therefore, effective suppression of the copper loss may require design optimization of the inductor structure to achieve a uniform AC current distribution in the parallelconnected wires.…”

Section: Introductionmentioning

confidence: 99%

“…The AC current distribution of magnetic devices has been analyzed and predicted commonly using FEM-based electromagnetic field analysis (4) (17) (18) . However, numerical calculation may be inconvenient in practical inductor design because of its complicated analysis procedure as well as complicated model construction.…”

Section: Introductionmentioning

confidence: 99%

Extremum Co-Energy Principle for Analyzing AC Current Distribution in Parallel-Connected Wires of High-Frequency Power Inductors

et al. 2018

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Inductor winding is often comprised of parallel-connected wires to suppress copper loss. However, in high-frequency inductors, the proximity effect can cause concentrated AC current distribution, hindering the suppression of the copper loss. Therefore, optimization of the physical inductor structure requires predicting the AC current distribution caused by the proximity effect. Certainly, simulators have been commonly employed for predicting the AC current distribution. However, simple analytical methods are also required for efficient design or invention of inductor structures that have more uniform AC current distribution among the parallel-connected wires. The paper proposes a novel simple analysis method for AC current distribution in parallel-connected wires of high-frequency inductors. The proposed method is based on a novel insight that AC current is distributed to give an extremum of the magnetic co-energy contributed by the AC flux under the given total AC current. Analysis of basic inductor structures revealed that the proposed method can derive the AC current distribution by straightforward calculation. In addition, experiments supported the analysis results. Consequently, the proposed method is suggested to be promising for developing inductor structures with less copper loss.

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An algorithm for fast calculation of short circuit forces in high current busbars of electric arc furnace transformers based on method of images

Moghaddami

Moghadasi

Sarwat

2016

Electric Power Systems Research

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This paper proposes an algorithm for the calculation of short circuit forces on the high current busbars of electric arc furnace (EAF) transformers based on the method of images using an analytical solution for the electromagnetic force between two adjacent current carrying rectangular conductor. The theory of images is used to account for the impact of the tank walls on the short circuit forces on the busbars. The proposed method uses an iterative algorithm and increases the number of image layers to achieve the desired accuracy. A 30 MVA EAF transformer is investigated as a case study and the results are compared to 2D finite element analysis (FEA). ANSYS software is used for the FEA. The proposed algorithm converges very fast, so that only in its first iteration, the convergence error is less than 0.2%. The comparisons show that the short circuit force calculations using the proposed method, conform to the 2D FEA results. However, the short-circuit calculation time using the proposed method is about 20 times faster than the 2D FEA with the same relative error. Therefore it can be used as a faster alternative for the FEA. The proposed method is characterized by fast convergence, simple calculations and high precision.

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Balancing Current Distribution in Parallel Windings of Furnace Transformers Using the Genetic Algorithm

Cited by 16 publications

References 6 publications

Current distribution in the low-voltage winding of the furnace transformer

Current distribution in the low-voltage winding of the furnace transformer

Extremum Co-Energy Principle for Analyzing AC Current Distribution in Parallel-Connected Wires of High-Frequency Power Inductors

An algorithm for fast calculation of short circuit forces in high current busbars of electric arc furnace transformers based on method of images

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