• 제목/요약/키워드: electromagnetic transient

검색결과 288건 처리시간 0.029초

첨두부하 저감을 위한 비상발전기 연계형 STS 운영 방안에 관한 연구 (A Study on Operation Scheme of STS with Emergency Generator for Peak Shedding)

  • 김창환;이상봉;김규호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2015년도 제46회 하계학술대회
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    • pp.155-156
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    • 2015
  • Recently, electricity consumption has rapidly increased along with economic growth. The operating strategy using emergency generator is aimed, to resolve a demand response management. For strategy of peak shedding using emergency generator, it is essential to introduce the fast transfer switching device. One of the most effective solutions is to use a static transfer switch (STS) based on thyristor. However, the characteristic of natural commutated SCR thyristor should anticipate short duration voltage sag. STS system thus requires more than a quarter cycle to successfully complete transfer process. This paper proposes the operation scheme of the STS system using the forced-commutation technique to mitigate instantaneous voltage sag during peak transfer process. Proposed STS system improved turn-off characteristic thus accomplishes the peak load shedding satisfied power quality. Performance of the proposed STS system is evaluated using electromagnetic transient program (EMTP) to confirm the effectiveness.

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전력유도 현상과 차폐계수 (Phenomenon of Power Interference and Screening Factor)

  • 황종선;김영민;이경욱;김재준
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 추계학술대회 논문집 Vol.14 No.1
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    • pp.621-624
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    • 2001
  • A metal sheath provides a cable with electrostatic screening and a degree of magnetic screening. The presence of a screen on a cable also reduces the induction arising from the high-frequency components of transients caused by power-line switching and also induced transients from lightning strokes; such transient induced voltages are of increasing importance with the increasing use of miniaturized telecommunication equipment with very small thermal capacity. This paper describes electrostatic induction and electromagnetic induction caused by power interference. Also screening factors are proposed.

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Analysis of Operating Characteristics of PM-Type Magnetic Circuit Breaker

  • Jun, Hee-Deuk;Woo, Kyung-Il;Kwon, Byung-Il
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제3B권2호
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    • pp.74-78
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    • 2003
  • This paper describes the operating characteristic analysis of the PM-type linear oscillatory actuator used as a magnetic circuit breaker for the electromagnetic field, electric circuit, and mechanical motion problems. Transient calculations are based upon a 2D finite element magnetic field solution including non-linearity of materials. Changes of the dynamic characteristics from the eddy current in the plunger are quantified from finite element analysis. A new laminated model is proposed to decrease the eddy current effect.

형상 변화에 따른 Magnetic Actuator의 동작 특성 해석 (Operation Characteristic Analysis of Magnetic Actuator by configuration change)

  • 박정홍;김중경;주수원;한성진
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.128-130
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    • 2002
  • This paper describes the operating characteristic analysis of magnetic actuator that is used in breaker using 3-D axisymmetry finite element method. To analyze the operating characteristic of magnetic actuator for configuration change is designed an A, B model and C. Also, For Transient analysis of Electromagnetic system is considered Non-linear characteristic for magnetizing of iron. The analysis results of A, B model and C for magnetic actuator compared with those characteristic respectively.

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서지 전류에 의한 접지계의 과도응답 특성 및 접지저항 비교 (A Comparison on the Resistance and characteristics of Transient response of Grounding Systems under Surge Currents)

  • 신동호;김용;정철희;조대훈;김필수
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.222-225
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    • 1999
  • This paper presents the surges response of the grounding systems using frequency domain electromagnetic field analysis software package. The frequency and time domain performance of a building grounding systems subjected to a lighting strike is described and discussed. The computed scalar potentials is presented graphically as a function of spatial coordinates. A double exponential lighting surge current is injected at one corner or the building grounding systems. Time-variant response of rod, mesh and kit grounding systems under impulse currents have been obtained. This paper deals with the results of studies on the time variation of ground resistance in three grounding systems.

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송전선로의 역섬락에 의한 전압파형의 통계적 분석에 대한 연구 (A Proposed Statistical Analysis on the Backflashover Voltage Surge Waves on a Transmission Line)

  • 조연옥;구자윤;박동욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
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    • pp.272-277
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    • 1987
  • A probabilistic model to analyze surge voltage waves on a transmission conductor caused by lightning, strokes striking a transmission line tower has been proposed. In this proposed model, a probability apace has been constructed. Based on the constructed probability space, random variables denoting the voltage peaks, time to crest, and time to half have been generated. To know the statistics of surge voltage waves, it suffices to find out the cumulative probability distributions of these random variables. A illustrative numerical example to find out out the distributions of the random variables has been carried out using the Electromagnetic Transient Program(EMTP).

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EMTP를 이용한 지중 송전 케이블의 시스 순환전류 분석 (EMTP-Analysis of Sheath Circulating Current on Underground Transmission Cables)

  • 하체웅;김정년;이수길
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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    • pp.213-215
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    • 2001
  • This paper describes an improved analysis method for sheath circulating current on three-underground transmission cables using EMTP(Electromagnetic Transient Program). Author studied diversely the sheath circulating current on three-underground cables depending on the various length rate, the phase arrangement, and the grounding resistance of the sheath in the cross-bonded section. It was clear that very large circulating current is generated in cable systems due to unbalanced length rate and phase arrangement in the cross-bonded section. The analysing method for two or more underground cables will be really Improved for cable system utility.

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345kV/154kV 계통 과전압 해석과 공기절연간격 산정 (Overvoltage Analysis and Air Clearance Design of 345kV/154kV Transmission Tower)

  • 심응보;우정욱;곽주식;윤상훈;김경호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 A
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    • pp.449-451
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    • 2001
  • This paper described the switching overvoltage analysis on the 345kV and 154kV transmission system by EMTP(Electromagnetic transient Program) for the enactment of current insulation design standards of KEPCO. The air clearance design of current transmission tower was reviewed and revised by the calculated result, considering swing angle for the each type of insulator string by the wind velocity.

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펄스파워전원용 고전압 펄스변압기 (High voltage Pulse Transformer for Pulsed Power Supply)

  • 김종해;구치욱;최영욱;이홍식;임근희;고광철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 E
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    • pp.1755-1757
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    • 1998
  • Pulse transformers have been developed to apply for pulsed power technology as an alternative of a Marx generator. To obtain repetitive pulsed power generation, it is necessary to observe the rising time of output of pulse transformer. In this paper, using the equivalent circuit, The rising wave of output of pulse transformer is simulated for various input wave by using the Electromagnetic transient program(EMTP).

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IGBT 스위치를 이용한 전력용 반도체 Marx Generator와 EMTP 시뮬레이션 (Solid State MARX Generator Using IGBTs and EMTP simulations)

  • 성영훈;이근용;고광철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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    • pp.1241-1242
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    • 2006
  • 기존의 Gap switch를 이용한 Marx generator는 트리거-펄스 발생회로가 따로 필요하여 복잡한 구조를 가질 뿐만 아니라, 스위치의 짧은 수명과 스위치 내부의 스파크전류의 Jitter 현상, 그리고 순차적인 스위치 turn-on과 스위치 내외부의 인덕턴스로 인한 전압 상승시간의 지연 등의 단점을 가지고 있다. 본 논문에서는 이러한 단점들을 해결하기 위해 기존의 Gap switch대신 전력용 반도체 소자인 IGBT(Insulated Gate Bipolar Transistors) 스위치를 이용한 Marx generator를 제안하고, 제안된 회로의 동작을 구현하기 위해 전력계통용 전자기과도현상 해석프로그램인 EMTP(Electromagnetic Transient Program)를 사용하여 시뮬레이션 하여 IGBT스위치가 이상적인 동작을 할 때 얻어지는 이 점을 알아보기로 한다.

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