• Title/Summary/Keyword: Transformer Design

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Modeling and Simulation of Superconducting Transformer using PSCAD/EMTDC (PSCAD/EMTDC를 이용한 초전도 변압기의 모델링과 시뮬레이션)

  • 임채형;박민원;유인근
    • Progress in Superconductivity and Cryogenics
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    • v.6 no.1
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    • pp.33-38
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    • 2004
  • This paper presents an effective simulation method for the high temperature superconducting (HTS) transformer using PSCAD/ EMTDC. Although researches and developments are performed for the HTS technologies, problems such as AC loss and quench phenomenon need to be solved for efficient design of HTS transformer. In addition, pre-study on the HTS transformer is a sort of time and cost consuming work, thus it is very worthy or being analyzing the characteristics of the HTS transformer in advance through a proper simulation method. It is very important to analyze the HTS devices by the simulation for seeking suitable and reasonable parameters for the practical application of those apparatuses in advance. A software- based component is suggested for- the simulation of the HTS transformer using PSCAD/ EMTDC and the numerical results are analyzed in detail in this paper.

Design and Analysis of A Rectangular Type Core for A Contactless Power Transmission system (비접촉 진력전송 시스템을 위한 'ㅁㅓ'형 코어 설계 및 분석)

  • Jin, Kang-Hwan;Kim, Ji-Min;Kim, Soo-Hong;Kim, Eun-Soo;Kim, Yoon-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.1
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    • pp.52-57
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    • 2008
  • In the transformer that is used for the contactless power transmission system, the primary and secondary sides are separated structurally unlike general transformers. When the contactless transformer is built, it forms relatively bigger air gap than the general transformer. Thus it is difficult to transfer energy from the primary side input to the secondary side output with high power efficiently because of low coupling coefficient. This paper proposes a contactless transformer using the rectangular type core that maintains high coupling coefficient even when it has relatively large air gap. The performance characteristics of the proposed transformer are compared with the transformer using general EE core to the air gap variation. The proposed contactless system using rectangular type core and dc-dc full bridge converter, and the system using EE core type and dc-dc full bridge converter are respectively implemented and their performance characteristics are verified by the simulation and experiment.

Electrical characteristics of PET film for wire insulation of transformer in fluorocarbon (Fluorocarbon에서의 변압기권선 절연용 PET필름의 전기적 특성연구)

  • 허창수;이재복
    • Electrical & Electronic Materials
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    • v.9 no.5
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    • pp.483-489
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    • 1996
  • Power transformer have many unsymmetrical structure and electric field is enhanced in that area. Those unsymmetrical area are not covered oftenly by solid insulating material which is used as a framework specially in gas transformer. By that result there is a possibility to decrease the total insulation class of the transformer. So in this study the electrical characteristic of $FC+SF_6$ mixture gas which is used as coolants for large power gas insulated transformer and its effects on electrical characteristics of structural material are investigated. Also breakdown characteristic with the tension of taping and curvature of the coil are studied which could be used as a design factor of large power transformer.

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Performance Test and Design of Harmonic Reduction Hybrid Transformer (고조파 저감형 하이브리드 변압기의 성능시험)

  • Kim, Ji-Ho;Han, Sung-Ho;Son, Jin-Gun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.4
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    • pp.277-282
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    • 2014
  • Hybrid transformer means the distribution transformer, one of multi-function transformer equipped with the enhancement function of harmonics and unbalance. In other words, since existing transformer are equipped simply with transformation function only, a separated electric facility should be additionally installed in order to reduce the mutual harmonics and unbalance. Meanwhile, since hybrid transformer can perform the reduction of harmonics and unbalance as well as transformation function simultaneously through zigzag winding, it doesn't need any additional electric facility. This study addressed the issue of developing and testing the performance of a generator that would reduce the harmonics supplied to the grid when grid-connected with the output of a photovoltaic inverter for photovoltaic generation system.

Operational Characteristics of a 5kVA Superconducting Transformer (5kVA 초전도변압기의 동작특성)

  • Choi, K.D.;Lee, S.J.;Kim, D.S.;Lee, J.K.;Kim, D.H.;Cha, G.S.;Hahn, S.Y.
    • Proceedings of the KIEE Conference
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    • 1994.11a
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    • pp.111-113
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    • 1994
  • For the analysis of characteristics of a superconducting transformer, we designed and fabricated a 5kVA superconducting transformer with two kinds of secondary winding. Using the results of the open and short tests, we calculated the parameters of its equivalent circuit. We designed also a 5kVA conventional transformer with the same design conditions as the superconducting one. The performances of the superconducting transformer were compared with the performances of the designed conventional transformer and another 5kVA distribution transformer.

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Non contact Coupler Design in Non contact Power Supply (비접촉 전원장치의 비접촉 커플러 설계)

  • Ryu, M.H.;Cha, H.N.;Baek, J.W.
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1500-1502
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    • 2005
  • In this paper, the electrical characteristics of the non-contact transformer is presented using conventional coupled inductor theory. Each non-contact transformer is analyzed through simulation and measurement. In high power applications, non-contact transformer is so bulky and heavy that it should be split by some light transformers. So non-contact transformer needs several small transformer modules which are connected series or parallel to transfer the primary power to the secondary one. This paper shows analytic result of the each non-contact transformer module and comparison result between series-connection and parallel-connection of the non-contact transformer. The results are verified on the simulation based on the theoretical analysis and the 30kW experimental prototype.

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Design of Clustering CoaT Vision Model Based on Transformer (Transformer 기반의 Clustering CoaT 모델 설계)

  • Bang, Ji-Hyeon;Park, Jun;Jung, Se-Hoon;Sim, Chun-Bo
    • Proceedings of the Korea Information Processing Society Conference
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    • 2022.05a
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    • pp.546-548
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    • 2022
  • 최근 컴퓨터 비전 분야에서 Transformer를 도입한 연구가 활발히 연구되고 있다. 이 모델들은 Transformer의 구조를 거의 그대로 사용하기 때문에 확장성이 좋으며 large 스케일 학습에서 매우 우수한 성능을 보여주었다. 하지만 Transformer를 적용한 비전 모델은 inductive bias의 부족으로 학습 시 많은 데이터와 시간을 필요로 하였다. 그로 인하여 현재 많은 Vision Transformer 개선 모델들이 연구되고 있다. 본 논문에서도 Vision Transformer의 문제점을 개선한 Clustering CoaT 모델을 제안한다.

Design of an HTS Transformer with OLTC (OLTC를 고려한 고온 초전도 변압기의 설계)

  • Choi, J.H.;Lee, S.W.;Park, M.J.;Joo, H.G.;Han, J.H.;Hahn, S.Y.;Choi, K.D.
    • Progress in Superconductivity and Cryogenics
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    • v.9 no.1
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    • pp.67-71
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    • 2007
  • HTS transformers which have been developed until now had only fundamental structures. Among the auxiliary functions of conventional transformers, voltage regulating is the most important one. For the voltage regulation, conventional transformers are equipped with on load tap changers (OLTCS). In this paper, we describe the possibility of the HTS transformer with OLTC. For the case study, we designed a single phase 33 MVA HTS transformer with OLTC. It is one of three individual HTS transformers which composes a 3 phase, 100 MVA transformer. It is expected to substitute for a 3 phase, 60 MVA conventional transformer in Korea. The parameters of an HTS transformer are varied due to the gap length between primary and secondary windings. The length was decided for the transformer to have the impedance of 12 %. Its size was limited to the one of the conventional transformer. The characteristics of the HTS transformer were analyzed in both case of having OLTC and not.

Design and FEM Analysis of Multilayer Piezoelectric Transformer for AC-adapter (AC-adapter를 위한 적층형 압전트랜스포머의 설계 및 유한요소해석)

  • 정현호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.04a
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    • pp.529-533
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    • 2000
  • This paper present a new sort of multilayer piezoelectric ceramic transformer for AC-adapt. This piezoelectric transformer operates n the second thickness extensional vibration mode. The output voltage of the multilayer piezoelectric transformer was simulated using ANSYS. As results, the maximum stress appeared at the two points where one is the middle of input and the other is middle of output side in Second thickness extensional vibration mode. And output voltage was inversely decreased by increasing number of output layers.

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