• 제목/요약/키워드: Electric Pole

검색결과 249건 처리시간 0.039초

삼륜 전기 자동차용 외전형 In-Wheel BLDCM의 개발 (Development of Outer-Rotor Type In-Wheel BLDCM for Three-Wheeled Electric Vehicle)

  • 정광일;안진우
    • 전기학회논문지
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    • 제61권4호
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    • pp.567-573
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    • 2012
  • Outer rotor type in-wheel Blushless DC Motor(BLDCM) for three-wheeled electric vehicle is researched. In-wheel system is to drive the electric vehicle without mechanical transmission, shaft, differential gears or other mechanical system. The motor is designed considering the performance requirements and drive modes of the vehicle. The determined dimensions as well as the slot and rotor pole are simulated by magnetic and thermal finite element analysis and ansys workbench to analyze the performance and heating of the motor. In order to verify the performance characteristics of the proposed motor, the experiment tests are executed and satisfy well the requirements.

배전변압기 감시제어 기능이 통합된 지능형 배전자동화 시스템 개발 방향 (Development target of intelligent DAS with the function of distribution transformer monitoring)

  • 하복남;설일호;박신열;정영범
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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    • pp.554-556
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    • 2005
  • Distribution Automation System (DAS) will provide supervision and remote control of switches and reclosers such as pole pounted switches and pad-mounted switchgears on high voltage distribution line. Kepco had developed basic function such as remote monitoring, remote control, remote measuring and remote setting at first. As a next step, Kepco has been developed diverse application programs such as single line diagram drawing program, relay coordination program, feeder reconfiguration program, over load elimination program, bad data detection program, section load management program, fault processing program and so on. Kepco is examining to develop more powerful functions for special specification of foreign distribution automation system. This paper explains what is the target for overseas DAS market.

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주파수 응답 분석기를 이용한 주상변압기 상태진단 사례 (Case Study on the Fault Discrimination of Pole Transformer using Frequency Response Analyzer)

  • 강문호;피재환;진승환;이강세
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2015년도 제46회 하계학술대회
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    • pp.1490-1491
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    • 2015
  • 주파수 응답 분석기(Frequency Response Analyzer, FRA)는 수십 MHz 고주파수 범위까지 기기의 전달함수를 측정하여 변압기, 리액터 등과 같은 권선형 기기 내 기계적, 기하학적 변형을 진단하는 장치이다. 배전선로에 운영 중인 권선형 기기인 주상변압기는 현재 193만대(2015. 4 기준)가 현장에 설치되어 운전 중에 있다. 그러나 변압기의 상태진단은 권선저항 측정, 전압비 측정 등 기초적인 단계에 있으며 일부 PD 분석기법이 연구 중에 있다. 본 논문에서는 권선형 기기의 진단에 기 활용하고 있는 주파수 응답 분석기(FRA)의 측정원리를 바탕으로 주상 변압기에 적용하여 적용 가능성을 검토하였다.

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발전기 운전중 회전자 진단에 관한 연구 (On-Line Diagnosis Method for Generator Rotor Windings)

  • 이영준;공태식;김희동;주영호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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    • pp.1846-1849
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    • 2002
  • A shorted-turn test was performed at the Sininchon combined cycle power plant on gas turbine generators. The test was conducted using a permanent flux probe and on-line diagnosis system. The flux probe installed in the generator air gap senses the field winding slot leakage flux and produces a voltage proportional to the rate of change of the flux. This pattern of flux variation is a signature unique to each field winding. We have also applied a voltage waveform analysis technique that can identify the pole location, slot number and number of shorted-turn with each slot.

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발전기 운전중 회전자 계자권선의 단락 진단기법에 관한 연구 (Shorted-Turn Detction Techniques for Generator Rotor)

  • 이영준;김희동;빅종정;주영호;조지원;이병하
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 E
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    • pp.1721-1724
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    • 1998
  • A shorted-turn test was performed at the Pyungtaek combined cycle power plant on gas. turbine generator #4. The test was conducted using a permanent flux probe and digital oscilloscope. The flux probe installed in the generator air gap, senses the field winding slot leakage flux and produces a voltage proportional to the rate of change of the flux. This pattern of flux variation is a signature unique to each field winding. We have also applied a waveform analysis technique that can identify the pole location, slot number, and number of shorted-Turns with each slot.

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NSE-Sponsored Faculty Workshops on Teaching of Power Electronics and Electric Drives

  • Ned Mohan;Jain, Amit-Kumar
    • Journal of Power Electronics
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    • 제2권4호
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    • pp.231-239
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    • 2002
  • This paper describes the restructuring of power electronics and electric drives courses, sponsored by NSF, EPRI, NASA and the local utilities, which has significantly increased student enthusiasm, and the undergraduate enrollment in these courses at the University of Minnesota has tripled since 1997. The developed leaching approaches have been the subject of NSF-sponsored faculty workshops in 1994, 1997, 1998,2002, and 2003. In power electronics, the power-pole based building-block approach unifies analysis and control aspects of all converters. PSpice-based simulations aid in analysis and design, supported by a hardware laboratory. For electric drives, an integrative approach addressing all three aspects of electric drives - machines, power converters and control is being. used. Space vectors, introduced on a physical basis rather than purely mathematical ions, are used fur analysis of ac machines. This leads to a more physical understanding of machine operation and also makes it easier to address control aspects in the advanced course. The lecture materials are supported by a DSP-based laboratory.

핫라인 써포트암을 이용한 직접활선 완철교체공법 (The Method for Replacement of Strain Pole Crossarm using the Hot-line Support Arm)

  • 김정식;박용범;문성원;송현석;조시형;최명호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 전기설비
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    • pp.83-84
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    • 2006
  • 본 논문은 가공배전선로용 무정전 내장주 완철교체용 활선공구 및 표준화된 활선공법 개발에 있다. 개발된 공구의 명칭을 핫라인 써포트암으로 부여하였으며 활선공구의 활용성을 높이고 직접활선의 안정성을 향상시키기 위하여 완철교체작업을 현재 공법보다 손쉽고 안전하게 작업할 수 있는 직접활선공법을 개발한다.

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400km/h급 Test-Bed 교량 구간 단독주 기초 강도검토를 위한 최대 모멘트 계산 (Maximum Moment Calculation in Order to Assure a Mast Foundation Strength in a Test-Bed for the Maximum Speed of 400 km/h)

  • 이기원;권삼영;조용현;정흥채;박영
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.1497-1502
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    • 2011
  • Increasing tensions of contact wire and messenger wire are essential to construct a test-bed for catenary system in the 400km/h speed on Honam high-speed railway. Because heavy load is applied to a mast due to the increased the tensions of both wires it is required to investigate the strength of the foundation. Therefore, in this study the maximum moment of an electric pole under the worst condition was calculated to investigate the strength of the pole foundation on the bridges. The maximum moment database table used in the construction of Kyungbu high-speed railway was referenced to derive the worst conditions and to review the composition of catenary system in the test-bed section. From the results of this study regarding assumptions and calculation process it will be possible to estimate the optimized strength of the pole foundations on the bridges which will be constructed in the future.

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SRM의 토크리플을 고려한 극호형상의 최적설계 (Optimum Design of Pole arc shape Considering Torque Ripple of SRM)

  • 이진우;우경일;김홍석;권병일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.30-32
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    • 2001
  • Switched reluctance motors have the advantage a high torque/weight ratio, as the large reluctance torque is made by salient poles of both start and rotor, and a high reliability. On the other hand, the switched reluctance motors have the disadvantage of a large ripple torque which is made by salient poles. So the application for the industrial fields have been limited to special cases. Geometric significant parameters are ${\beta}_r$ and ${\beta}_s$ respectively the rotor and stator pole arc while the significant electric parameters are the angles where the drive switches are turned on and off. It can be simulated that ${\beta}_r$ and ${\beta}_s$ must be chosen in a particular region of the plane (${\beta}_r,\;{\beta}_s$) called the feasible triangle. The aim of this paper is to simulate the minimum of the torque ripple by using finite element method and to determine the best choice of the rotor and stator pole arc.

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4극 저압차단기 N상 Trip장치를 사용한 영상고조파 안전성 개선방안 (Safely Improving Method to Zero-Harmonics Current with 4-Pole Low Voltage Circuit Breaker Equipped N-phase Trip Device)

  • 기채옥;김주철;최창규
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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    • pp.458-461
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    • 2009
  • 3상 4선식 배전방식에서 비선형 부하증가로 인한 제 3고조파 전류발생은 선로의 중성선 및 기기를 과열시키는 원인으로 작용하고 있다. 따라서 고조파에 의한 역률저하 및 기기, 선로 등을 안전하게 보호할 필요가 있다. 본 논문에서는 제 3고조파 전류로 인한 사고사례를 조사하고 고조파 분석 및 부하 불평형 등을 분석하였다. 이를 통해 가장 경제적인 4극 저압차단기를 사용하여 중성선의 과전류로부터 선로 및 기기를 보호하는 방법을 제시하였다.

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