Comparison of Power Loss and Magnetic Flux Distribution in Octagonal Wound Transformer Core Configurations

Çınar, Mehmet Aytaç; Alboyacı, Bora; Şengül, Mehlika

doi:10.5370/jeet.2014.9.4.1290

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…In transformers with three‐phase three‐legged stacked cores, iron loss (BF) may increase because of rotating magnetic flux generated near the core T‐joints, 1 concentration of magnetic flux inside the core, and interlaminar magnetic flux in the overlap region that occurs in normal direction, etc 2 . On the other hand, in wound‐core transformers, iron loss increases due to interlaminar magnetic flux in the overlap region that occurs in normal direction, 3,4 concentration of magnetic flux into the inner side of iron core, 5 etc.…”

Section: Forewordmentioning

confidence: 99%

Influence of interlaminar flux between cores on iron loss in three‐legged wound transformer core

Inoue¹,

Omura²,

Yamaguchi³

et al. 2021

Electrical Engineering Japan

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A three-legged wound transformer core is composed of two inner cores and one outer core, and the interlaminar flux occurs between inner and outer cores in three-phase excitations. Past analyses of magnetic properties of three-legged wound transformer cores were based on the model of independent magnetic paths in the individual core, and did not factor the influence of interlaminar flux in the calculations. This paper shows experimental results of interlaminar flux between cores and iron loss increase caused by that. Results show that the interlaminar flux between the inner and outer core increases the local iron loss in the boundary region of the inner and outer core.

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Section: Forewordmentioning

confidence: 99%

Influence of interlaminar flux between cores on iron loss in three‐legged wound transformer core

Inoue¹,

Omura²,

Yamaguchi³

et al. 2021

Electrical Engineering Japan

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“…Today, it is known that the wound core structure can be applied technically up to 5 MVA power level. However, due to the wound core manufacturing costs are higher, multistep lap stacked core construction in distribution level is still predominant [16,17].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Technical and Economic Feasibility of Mixed Grade Cores in Transformer Design According to EN50588-1

Çınar

2021

Teh. vjesn.

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Permissible maximum no-load and load losses of distribution transformers are given in EN50588-1 regulation. The main parameter in transformer design, which affects the core loss of a transformer, is core grade. Selecting the superior grades, which have better electromagnetic performance, transformer no-load losses could be minimized. However, such grades increase the cost of core. In this study, ability of designing distribution transformers, which correspond to the loss classes given in EN50588-1, is investigated using eleven different core steels. Then mixed graded core constructions are evaluated to minimize the core material cost, by means of technical and economical manner. Analytically calculated parameters of designed mixed graded transformer are investigated and verified by both electromagnetic simulations using finite element method and experimental tests of manufactured prototype transformer. Considering the current specific costs of different grades, core costs of mixed cores were calculated as 28,2%; 4,45% and 7,81% lower than the reference single graded cores for A0, AA0 and AAA0 loss classes, respectively.

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“…In larger transformers, stacked cores are more common, whereas in small and medium transformers, wound cores predominate. Using octagonal shaped wound cores, producing distribution transformers up to 5MVA, with reduced losses and manufacturing costs, is possible [18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Economical and Technical Design Feasibility of Si-Fe Graded Distribution Transformers according to EN50588-1

Çınar¹

2020

Pamukkale J Eng Sci

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ÖzMedium power transformers are responsible of the great part of total power losses in the grid. With EN50588-1 regulation, no-load and load losses have strictly classified fo † r high-efficient transformer designs. Manufacturers are currently focusing on obtaining the most efficient design with minimum cost. In this paper, manufacturing feasibilities of Si-Fe graded distribution transformers, considering the requirements of EN50588-1 regulation, are investigated. Eleven different steel types in three grades are evaluated using twenty different electrical designs. A prototype transformer was both simulated and experimentally tested to verify the results of design studies. Obtained results show that the manufacturing of A0 and AA0 class transformers are feasible using Si-Fe grades with suitable manufacturing methods. However, amorphous materials seem to be a mandatory choice for AAA0 class transformers in technical manner. Dağıtım transformatörlerinde meydana gelen güç kayıpları elektrik şebekesindeki toplam kayıpların büyük kısmını oluşturmaktadır. EN50588-1 standardı ile yüksek verimli transformatörlerde izin verilen en yüksek boşta ve yükte güç kayıpları yeniden düzenlenmiştir.Elektriksel kısıtlara ek olarak, transformatör üreticileri için maliyet parametresi önemli de bir kriter olmaktadır. Bu çalışmada, EN50588-1 standardında belirtilen kayıp sınıflarındaki dağıtım transformatörlerinin Si-Fe nüve malzemeleri ile üretim imkanı Teknik ve ekonomik yönden değerlendirilmektedir. Bu amaçla, üç ayrı sınıftaki onbir farklı Si-Fe nüve malzemesi kullanılarak yirmi farklı elektriksel tasarım gerçekleştirilmiş olup, bu tasarımların üretilebilirliği teknik ve ekonomik açıdan değerlendirilmiştir. Elde edilen sonuçlar, uygun üretim yöntemleri ile A0 ve AA0 kayıp sınıflarındaki transformatörlerin Si-Fe malzemeler ile üretilebileceğini, fakat AAA0 kayıp sınıfındaki dağıtım transformatörü üretimi için amorf malzeme kullanımının zorunlu olduğunu ortaya koymaktadır.

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Comparison of Power Loss and Magnetic Flux Distribution in Octagonal Wound Transformer Core Configurations

Cited by 13 publications

References 14 publications

Influence of interlaminar flux between cores on iron loss in three‐legged wound transformer core

Influence of interlaminar flux between cores on iron loss in three‐legged wound transformer core

Evaluation of the Technical and Economic Feasibility of Mixed Grade Cores in Transformer Design According to EN50588-1

Investigation of the Economical and Technical Design Feasibility of Si-Fe Graded Distribution Transformers according to EN50588-1

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