Magnetic Properties of Simultaneously Excited Amorphous and Silicon Steel Hybrid Cores for Higher Efficiency Distribution Transformers

Kurita, Naoyuki; Nishimizu, A.; Kobayashi, Chie; Tanaka, Yuichiro; Yamagishi, Akira; Ogi, Mizuki; Takahashi, Koichi; Kuwabara, Masanao

doi:10.1109/tmag.2018.2835498

Cited by 16 publications

(12 citation statements)

References 5 publications

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“…Four such groups (a total of eight blocks, 16 wound cores) arranged in x direction make up a three‐phase five‐leg core. A frame‐shaped iron core stacked of silicon steel sheets (shown by blue in the diagram) is placed on both stacking planes of the amorphous wound cores 12 . The frame‐shaped core is provided with steps, and the space between windings and cores is filled with silicon steel sheets to increase fill factor in the winding cross section.…”

Section: Structure Of 30‐mva Three‐phase Hbtmentioning

confidence: 99%

“…Besides, the top yoke is provided with a beam structure to support the amorphous wound core, thus suppressing increase in iron loss due to stress 14 . As regards proportion of the core materials, analysis of the single‐phase HBT 12 showed that iron loss can be reduced by more than 50% when proportion of silicon steel sheets is less than 20%. On the other hand, larger proportion of silicon steel sheets with high saturation flux density contributes to smaller size; thus, the proportion of 8:2 was adopted in this study.…”

Section: Structure Of 30‐mva Three‐phase Hbtmentioning

confidence: 99%

“…We previously designed and fabricated a prototype single-phase five-MVA HBT combining amorphous materials and silicon steel sheets, and demonstrated an increase of 10% in magnetic flux density as well as reduction of 8% in volume. 12 Thus feasibility of a transformer combining advantages of amorphous materials and silicon steel sheets was confirmed, but a three-phase HBT must be considered when aiming at larger capacity.…”

Section: Introductionmentioning

confidence: 99%

“…There were previous reports about design methods and prototype tests of transformers with iron cores made of silicon steel sheets of different grade, 9–11 but there are hardly any prototypes of transformers combining different core materials. We previously designed and fabricated a prototype single‐phase five‐MVA HBT combining amorphous materials and silicon steel sheets, and demonstrated an increase of 10% in magnetic flux density as well as reduction of 8% in volume 12 . Thus feasibility of a transformer combining advantages of amorphous materials and silicon steel sheets was confirmed, but a three‐phase HBT must be considered when aiming at larger capacity.…”

Section: Introductionmentioning

confidence: 99%

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Demonstration of loss reduction effect of 66 kV‐classed 30 MVA three phase hybrid‐core transformer by trial manufacture

Kobayashi

Kurita

Nishimizu

et al. 2020

Electrical Engineering Japan

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To realize larger‐capacity “Hybrid‐core transformer: HBT”, this research has assembled a 30‐MVA three‐phase trial HBT and evaluated the loss performances. The hybrid‐core consisting of the wound amorphous‐ and the stacked silicon steel‐cores, is expected having advantages of lower iron loss of the iron‐based amorphous material and the higher mechanical strength and saturation magnetic flux density of the silicon steels simultaneously. Three‐dimensional finite‐element method analysis revealed that the silicon steel core prevented over‐saturation of the amorphous core. The hybrid configuration enabled the design to have an approximately 10% higher magnetic flux density than configurations with only an amorphous core. We then assembled a prototype 30‐MVA three‐phase HBT designed on the basis of our investigation results. Operation tests demonstrated that the HBT has 62%‐reduced iron loss and 0.10%‐higher 50%‐loaded power efficiency from the conventional silicon steel core transformer.

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Section: Structure Of 30‐mva Three‐phase Hbtmentioning

confidence: 99%

Section: Structure Of 30‐mva Three‐phase Hbtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Demonstration of loss reduction effect of 66 kV‐classed 30 MVA three phase hybrid‐core transformer by trial manufacture

Kobayashi

Kurita

Nishimizu

et al. 2020

Electrical Engineering Japan

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“…Using low-loss, high permeability amorphous materials, the no-load losses of transformers are reduced up to 60-70% and increased transformer efficiency up to 99.7%, compared to grain-oriented silicon steel transformers [6]- [9]. However, due to the saturated flux density and lamination factor values are lower than those of a grain-oriented core, necessity of additional structure to support core weight makes amorphous cores physically larger and vulnerable, especially for high power levels [10]. To avoid, the disadvantages of amorphous materials, such as higher cost and supply problems, combining grain-oriented silicon steel grades are also considered by the manufacturers.…”

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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Laminated nanocrystalline-ferrite high saturation magnetic flux density composite core for use in high-frequency transformers

Xia,

Chen,

Mao

et al. 2024

J. Power Electron.

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Magnetic Properties of Simultaneously Excited Amorphous and Silicon Steel Hybrid Cores for Higher Efficiency Distribution Transformers

Cited by 16 publications

References 5 publications

Demonstration of loss reduction effect of 66 kV‐classed 30 MVA three phase hybrid‐core transformer by trial manufacture

Demonstration of loss reduction effect of 66 kV‐classed 30 MVA three phase hybrid‐core transformer by trial manufacture

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

Laminated nanocrystalline-ferrite high saturation magnetic flux density composite core for use in high-frequency transformers

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