• Title/Summary/Keyword: The single transformer

Search Result 380, Processing Time 0.03 seconds

Development of PWM Converter System for Solar Cell Silicon Ingot Glowing 120kW 3kA (태양전지 실리콘 결정 성장용 120kW 3kA PWM 컨버터 시스템 개발)

  • Kim, Min-Huei;Park, Young-Sik
    • The Transactions of the Korean Institute of Electrical Engineers P
    • /
    • v.63 no.3
    • /
    • pp.125-130
    • /
    • 2014
  • This paper is research result for a development of solar cell silicon ingot glowing(SCSIG) PWM converter system for 120[kW] 3[kA]. The system include 3-phase AC-DC rectifier diode converter of input voltage AC 460[V] and 60[Hz], DC-AC single phase full bridge PWM inverter of high frequency, AC-DC single-phase full wave rectifier using center-tapped of transformer for low voltage 50[V] and large current 3,000[A], carbon resistor load 0.2 [$m{\Omega}$]. PWM switching frequency for IGBT inverter control set 15KHz. The suggested researching contents are designed data sheets of power converter system, PSIM simulation, operating characteristics and analysis results of developed SCSIG system.

Development of PWM Converter System for Sapphire Silicon Ingot Glowing of 80kW 10kA (사파이어 실리콘 결정 성장용 80kW 10kA PWM 컨버터 시스템 개발)

  • Kim, Min-Huei;Park, Young-Sik
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.28 no.11
    • /
    • pp.33-41
    • /
    • 2014
  • This paper is research result for a development of sapphire silicon ingot glowing(SSIG) PWM converter system for 80kW 10kA. The system include 3-phase AC-DC diode rectifier of input voltage AC 380V and 60Hz, DC-AC single phase full bridge PWM inverter of high frequency, AC-DC single-phase full wave rectifier using center-tapped of transformer for low voltage 8.0V and large current 10,000A of output specification, tungsten resistor load 0.1[$m{\Omega}$]. PWM switching frequency for IGBT inverter control set 30kHz. The suggested researching contents are designed data sheets of power converter system, PSIM simulation, operating characteristics and analysis results of developed SSIG system. This paper propose

Forward Converter Using 300W Planar Transformer (300W 평면 변압기적용 포워드 컨버터)

  • Choi, S.H;Park J.Y;Kim E.S
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.9 no.6
    • /
    • pp.560-567
    • /
    • 2004
  • In this paper, the design and implementation of a high power(300W) forward converter using a planar transformer is presented. The overall size and volume of the converter is decreased by replacing a planar transformer in stead of using a conventional winding transformer. Due to the decreased size and volume, power density of the applied forward converter is increased. Also, in this paper, the 300W ZVS forward converter with active clamp snubber circuit is compared to the 300W hard switching forward converter planar transformer, the decreased size and volume, the 300W ZVS forward converter with active clamp snubber circuit, 30W hard switching forward converter.

A Study on the Vibration Reduction of the SPR(sudden pressure relay) in the Single Phase Main Power Transformers(345kV) (단상(345kV) 주변압기 압력 계전기의 진동절연에 관한 연구)

  • Park, Chul-Jun;Lee, Seong-Wook;Choi, Won-Ho;Lee, Wook-Ryun;Kweon, Ki-Young
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.20 no.5
    • /
    • pp.486-491
    • /
    • 2010
  • In this paper, it is identified that high-level vibration of the single phase main power transformers shut down due to the mechanical fault. vibration sources of the SPR in the transformer's are identified and the SPR vibrations are reduced by structural modification. For vibration characteristic identification, vibration signals were measured with an accelerometer when the transformer is driving. These signals are presented in a FFT analysis in order to find the dependency of frequency components on the transformer. From finite element analyses and some experiments, it is also found that resonances occur because the natural frequencies of the SPR exist in usual driving range. To shift the natural frequencies outside the driving range, the SPR is modified by increasing stiffness. It is verified that considerable amounts of vibration are reduced by the structural modification.

Examination of Two-Dimensional Magnetic Properties in a 5-Leg-Different- Volume- V-Connection- Transformer Core

  • Urata Shinya;Shimoji Hiroyasu;Todaka Takashi;Enokizono Masato
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.5B no.3
    • /
    • pp.243-247
    • /
    • 2005
  • The Different-volume- V-connection transformer is known as an electric power source that can supply 3-phase electric power and single-phase electric power at the same time. Usually, we use two single-phase transformers that have different volumes. In this paper, we propose the use of a 3-phase 5-leg transformer with the different-volume- V-connection. And, we examine the magnetic properties of the 5-leg core model with the different-volume- V-connection. The magnetic properties of cores with the different-volume- V-connection are compared with those with the delta-connection. In order to express the magnetic anisotropy of the core materials and to calculate the iron loss directly, the two-dimensional vector magnetic property is considered with the E&SS modeling in the simulation.

Flux Linkages Ratio-Based Transformer Protection (쇄교자속비를 이용한 변압기 보호)

  • 강용철;이병은;김은숙;원성호
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.52 no.11
    • /
    • pp.655-660
    • /
    • 2003
  • This paper describes a transformer protective relaying algorithm based on the ratio of increments of flux linkages (RIFL) of the primary and secondary windings. The algorithm uses integration approximation. The RIFL is equal to the turns ratio for all operating conditions except for an internal fault. For a single-phase transformer and a Y-Y transformer, the increments of flux linkages (IFL) are calculated. For a Y-$\Delta$ transformer, the difference of IFL are calculated to use the line currents rather than the delta winding currents, which are unavailable. Their ratios are compared with the turns ratio. The comparative study between the proposed and conventional differentiation approximation methods was conducted. The test results show that the algorithm reduces the approximation errors of the conventional methods.

Analysis of the Ferroresonance Characteristics in 3 Phase Transformer Considering Lateral Length of the Primary Cable (1차측 케이블의 측면길이를 고려한 3상 변압기의 철공진 해석)

  • Cho, K.S.;Kim, K.S.;Kim, H.C.;Shin, J.R.
    • Proceedings of the KIEE Conference
    • /
    • 1997.07c
    • /
    • pp.825-828
    • /
    • 1997
  • The ferroresonance characteristics in 3 phase transformer is analysed in this paper using EMTP simulations under the consideration of lateral length of the primary cable. The ferroresonant overvoltage or undervoltage may occur in cable-fed 3 phase transformer when single phase switching is made in relatively remote point from the transformer, and this phenomena is closely related to the lateral length of the cable. This paper shows the voltage characteristics concerned with the transformer ferroresonance and the proper lateral length of the cable for reducing the voltage in 3 phase installation, through some case studies.

  • PDF

A Study on the Fault Current of Distribution System according to Connection of Wind Turbine Generation Grid-Connected Transformer (풍력발전 계통연계 변압기의 결선에 따른 배전계통의 고장전류에 관한 연구)

  • An, Hae-Joon;Ro, Kyoung-Soo;Kim, Hyun-Goo
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2007.11a
    • /
    • pp.369-371
    • /
    • 2007
  • This study suggests a modeling of grid-connected wind turbine generation system that has induction generator, and aims to perform simulations for outputs by the variation of actual wind speed and for fault current of wind generation system by the transformer winding connection. This study is implemented by matlab&simulink. The simulation shall be performed by assuming single line to ground fault generated in the system. Generator power, generator rotor speed, generator terminal current and fault current shall be observed following the performance of simulation. The fault current change will be dealt through the simulation results for fault current of wind generation system following the grid-connected transformer winding connection and the simulation result by the transformer neutral ground method.

  • PDF

The Relationship between Wind Power Generation Grid-connected Transformer Winding Connection and Fault Current in MATLAB & SIMULINK (MATLAB & SIMULINK에서 풍력발전 계통연계 변압기결선과 고장전류와의 관계)

  • An, Hae-Joon;Kim, Hyun-Goo;Jang, Gil-Soo
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2008.10a
    • /
    • pp.307-309
    • /
    • 2008
  • This study suggests a modeling of grid-connected wind turbine generation system that has induction generator, and aims to perform simulations for outputs by the variation of actual wind speed and for fault current of wind generation system by the transformer winding connection. This study is implemented by matlab&simulink. The simulation shall be performed by assuming single line to ground fault generated in the system. Generator power, generator rotor speed, generator terminal current and fault current shall be observed following the performance of simulation. The fault current change will be dealt through the simulation results for fault current of wind generation system following the grid-connected transformer winding connection and the simulation result by the transformer neutral ground method.

  • PDF