• Title/Summary/Keyword: Transformer Design

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3-Dimensional Analysis of Temperature Distribution in Transformer (변압기 3차원 온도분포 해석)

  • Song, K.D.;Lee, W.Y.;Oh, Y.H.;Kim, S.C.
    • Proceedings of the KIEE Conference
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    • 1999.07a
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    • pp.86-88
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    • 1999
  • An analysis of temperature distribution in transformer is necessary for cooling design. But, it is very difficult to make that analysis because of the complicated structure of transformer. Particulary. if it is asymmetry, 3 dimensional analysis is required. This paper presents the 3-dimensional analysis technique of temperature distribution in transformer using a commercial CFD program FLUENT and the applied results in a simple model.

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A New Design Method for Multisection Impedance Transformer Based on the Inverse Scattering (역산란을 이용한 다단 임피던스 트랜스포머의 새로운 설계 방법)

  • 이민수;박영태
    • Journal of Korea Society of Industrial Information Systems
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    • v.6 no.4
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    • pp.89-94
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    • 2001
  • A new design method of the microwave multisection impedance transformer is proposed. This method is based on the inverse scattering theory using the frequency domain reflection coefficient of the transformer to be designed. In the first step, the permittivity profile of a virtual one-dimensional dielectric medium is reconstructed using the desired reflection coefficient. In the second step, the transformer which is equivalent to the reconstructed dielectric medium in view of reflection characteristics is synthesized. Theoretically, this method can be used to design the impedance matching transformers with arbitrary passband characteristics within the limit of the Bode-Fano criteria[1]. Our approach is examined for two design examples to show that it is valid.

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Development of Planar Transformer and SiC Based 3 kW High Power Density DC-DC Converter for Electric Vehicles (플라나변압기와 SiC 기반의 전기자동차용 3kW 고전력밀도 DC-DC 컨버터 개발)

  • Kim, Sangjin;Suk, Chaeyoung;Hakim, Ramadhan Muhammad;Choi, Sewan;Ryu, Byoungwoo;Park, Sanghun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.26 no.2
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    • pp.112-119
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    • 2021
  • This study proposes a design method of high-power-density and high-efficiency low-voltage DC-DC converters using SiC MOSFET and the optimized planar transformer design procedure based on the figure-of-merit. The secondary rectifying circuit of the phase-shifted full-bridge converter is compared to achieve high power density and high efficiency, and the phase-shifted full bridge converter with a current-doubler rectifier is selected. The planar transformer is designed by the proposed optimized design procedure and verified by FEA simulation. To validate the proposed design method, experimental results from a 3 kW prototype are provided. The prototype achieved 95.28% maximum efficiency and a power density of 2.98 kW/L.

Conceptual Design of 1 MVA HTS Transformer (1MVA 고온 초전도 변압기 개념설계)

  • 김우석;한송엽;최경달;주형길;홍계원
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2002.02a
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    • pp.233-236
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    • 2002
  • A conceptual design of single phase high Tc superconducting (HTS) 1MVA transformer was presented in this paper. The rated voltages of each sides of the transformer are 22.9kV /6.6kV respectively. Double pancake windings of BSCCO-2223 HTS tape and the room temperature shell type core are adopted. The HTS tapes of windings are going to be cooled down to 65K by sub-cooled liquid nitrogen. A cryostat made of nonmagnetic and nonconducting material with a bore is going to be used in order to locate the core out of the cryostat. This conceptual design will be modified and a fabrication of the machine is going to be based on the presented design in this paper.

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The design of high-voltage rectangular waveform generator (저주파 변압기를 이용한 구형파 증폭시스템)

  • Lee, B.H.;Choi, W.G.;Lim, J.K.;Lee, B.W.
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2152-2154
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    • 1999
  • In this paper, we suggested the design rule of high-voltage rectangular waveform generator working in low frequency domain (5Hz $\sim$ 60Hz). Most of the commonly used power electronic switching devices have voltage ratings up to several kV. So it is difficult to design and fabricate high-voltage switching systems with the power electronic devices alone. We have combined IGBTC(1200V, 50A) with the specially designed transformer to get the high-voltage rectangular waveforms up to 40kV. In this work. next two things are the main factors. The first one is design of transformer working low-frequency domain close to 5Hz. And the second one is additional voltage source to floating the transformer voltage output. As a result, we can get frequency-variable and high-voltage rectangular voltage waveform and this can be a more efficient power source of sandpaper manufacturing process.

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Insulating Design and Test of 22.9kV Class Mini-Model Transformer Considering AC Loss (AC Loss를 고려한 22.9kV급 Mini-Model 변압기의 절연 설계 및 시험)

  • 백승명;정종만;곽동순;김해종;석복렬;김상현
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.8
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    • pp.420-424
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    • 2004
  • This paper presents experimental data from model windings with different arrangement of coil in order to provide information to design a 22.9kV class HTS transformer. Before experiment, the composite insulation of two different type of HTS transformers are investigated. The first basic of investigation is a breakdown characteristic of liquid nitrogen and flashover characteristic on the GFRP surface under ac and impulse, The second investigation is insulation design, manufacture and test of model windings. These include a AC withstand voltage test of 50 kV rms and a lighting impulse test of 150 kV at peak.

Design of Half-Bridge Piezo-Transformer Converters in the AC Adapter Applications

  • Ryu, Myoung-Hwan;Choi, S.J.;Kim, T.I.;Cho, Bo.H.
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.456-458
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    • 2005
  • As a viable alternative to magnetic transformers in the power supply for portable electronics, this paper presents a miniaturized off-line travel adapter or charger for cellular phones using the piezoelectric transformer. Various design considerations in the design of ac PT adapters are investigated before coming up with the proposed pseudo-resonant topology. A prototype hardware design is also presented and verified by simulations and experiments

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Specialized VLSI System Design for the Generalized Hough Transform (일반화된 Hough 변환을 위한 특수 목적 VLSI 시스템 설계에 관한 연구)

  • 채옥삼;이정헌
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.32B no.3
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    • pp.66-76
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    • 1995
  • In this research, a mesh connected VLSI structure is proposed for the real time computation of the generalized Hough transform(GHT). The purpose of the research is to design a generalized Hough transformer that can be realized as a single chip processor. The GHT has been modified to yield a highly parallel structure consisting of simple processing elements(PEs) and communication networks. In the proposed structure, the GHT can be computed by first assigning an image pixel to a PE and performing shift and add operations. The result of the CAD circuit simulation shows that it can be computed in the time proportional to the number of pixels in the pattern. In addition to the Hough transformer, the peak detector has been designed to reduce 1)the number of the I/O operations between the transformer and the host computer and 2) the host computer's burden for peak detection by transmitting only the local peaks detected from the transformed accumulator. It is expected that the proposed single chip Hough transformer with peak detector makes a fast and inexpensive edge based object recognition systems possible for many industrial and military applications.

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A Case on Design and Construction of Tunnel for Under Passing an Underground Transformer Substation (지중변전실 하부통과를 위한 터널설계 및 시공사례)

  • 정동호;문상조;김선홍;이광제;석진호
    • Explosives and Blasting
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    • v.19 no.1
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    • pp.11-18
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    • 2001
  • This is a case history on design and cnostruction of tunnel for under passing an underground transformer substation. The original construction plan was cut & cover method to avoid blasting vibrations and displacements of facilities during the construction stages. But this plan was changed to tunnel because of the difficulties from construction period, cost and the required relocation site. As a results of tunnel construction, the relocation of transformer substation and replacements of transmission cables were not necessary. Therefore about 10 months of construction period and 3.5 billion wonts of construction cost were saved. Additionally, quantitative criterion for blasting was provided through the results of blasting vibration analysis.

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A study on capacitive transformer (용량성배전변압기에 관한 연구)

  • Sung Won Rhee
    • 전기의세계
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    • v.18 no.2
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    • pp.7-14
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    • 1969
  • From the first customer located right at the substation to the last customer at the end of the line, voltage must be held within close limits, so the voltage regulation is more important than the thermal limit. On a typical distribution system during the peak load period, the voltage drop may be serious enough to cause unsatisfactory operation of home appliances in the residential area, and present many problems to manufacturing industries, where the voltage must be maintained within close limits to insure smooth operation. Among all the factors contributing to voltage drop in the distribution system, the voltage drop in the distribution transformer may account for 30% of this figure. If we can eliminate this factor, the power companies can provide better quality electricity to more customers with the existing distribution facilities, thus saving on initial investment costs. Taking all these problems into consideration, the author undertook the design of a capacitive transformer which would give zero voltage drop at rated load and at 80% lagging power factor while incorporating overload features to withstand 400% overload for at least 100 seconds. The following are the results obtained through design, manufacture and test of an initial experimental transformer built with these specific purposes.

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