• 제목/요약/키워드: Vacuum arc

검색결과 323건 처리시간 0.032초

Vacuum Rotary Arc Gap Switch의 설계 및 시험 (Design and Test of Vacuum Rotary Arc Gap Switch)

  • 서길수;황동원;이태호;황리호;김희진;이홍식;임근희
    • 대한전기학회논문지:전기물성ㆍ응용부문C
    • /
    • 제52권1호
    • /
    • pp.19-24
    • /
    • 2003
  • Design and test results of a VRAG(Vacuum Rotary Arc Gap) switch were presented. To control the damage of electrodes caused by the vacuum arc, Lorentz's force by the radial magnetic field between spiral electrodes was used to rotate the vacuum uc. VRAG switch electrodes were made of the material of CuCr and OFHC. Gap distance between two spiral type electrodes for the rotation of the arc discharge is 8, 10, 12mm. In the cathode, one trigger electrode was inserted into each spiral wing. Normal operation of the VRAG switch was confirmed with 10.6[$mutextrm{s}$]of trigger delay and 2~3[$mutextrm{s}$] of the jitter time. The speed of the vacuum arc was measured to be 0.6 ~ 1[km/s] by a motion analyzer.

축방향 자기장에 의한 대전류 아크 특성에 관한 연구 (A Study on the Characteristics of High-Current Arc Plasma Influenced by Axial Magnetic Field)

  • 조성훈;이종철;최명준;권중록;김윤제
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2008년도 추계학술대회B
    • /
    • pp.2515-2518
    • /
    • 2008
  • The vacuum interrupter (VI) is widely used in medium-voltage switching circuits due to its abilities and advantages as an environmental friendly circuit breaker. An understanding of the vacuum arc flow phenomena is very important for improving the performance of vacuum interrupter. In order to closely examine the vacuum arc phenomena, it is necessary to predict the magnetohydrodynamic (MHD) characteristics by the multidisciplinary numerical modeling, which is coupled with the electromagnetic and the thermal flow fields, simultaneously. In this study, we have investigated arc plasma constriction phenomena and an effect of AMF on the arc plasma with the high-current vacuum arcs for the cup-type AMF electrode by using a commercial finite element analysis (FEA) package, ANSYS. The simulation results applied with various AMFs and constant Joule heat generation show that strong axial magnetic field (AMF) permits the arc to be maintained in a diffused mode to a high-current vacuum arc. However, further studies are required on the two-way coupling method and radiation model for arc plasma in order to accomplish the advanced analysis method.

  • PDF

자계가 인가된 진공아크의 확장 모의 (Simulation of Vacuum Arc Expansion with Magnetic Field)

  • 최원준;최승길;고광철;강형부
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 1998년도 추계학술대회 논문집
    • /
    • pp.183-186
    • /
    • 1998
  • Axial magnetic field generated by special electrode construction in vacuum interrupters is used to extinguish electric plasma arcs. This investigation by FDM should prove to what extent the magnetic field might influence on the arc expansion. The calculated results show that the stronger magnetic field induced the lesser radius of arc plasma. This study will help to offer good data in design of vacuum interrupters.

  • PDF

아크용(用) 소모성(消耗性) 전극(電極) 제조(製造)를 위한 타이타늄 선삭(旋削) 스크랩의 재활용(再活用) (Recycling of Ti Turning Scraps for Production of Consumable Arc Electrode)

  • 오정민;임재원
    • 자원리싸이클링
    • /
    • 제21권5호
    • /
    • pp.58-64
    • /
    • 2012
  • 본 연구는 타이타늄 선삭 스크랩을 진공 아크 용해에 의해 건전한 버튼형 잉곳으로 제조하여 아크 발생용 소모성 전극으로의 재활용을 위해 타이타늄 내 불순물의 거동 및 특성을 평가하였다. 먼저 가스불순물인 산소는 진공 아크 용해에 의해 초기 표면의 산화층에 의해 제거되지만 이후 타이타늄에 고용된 산소는 제거되지 않는 것으로 확인되었다. 타이타늄 스크랩의 대표 금속불순물인 철의 경우 타이타늄과의 증기압 차이로 인해 진공 아크 용해에 의해 최종 20분간 용해시 약 43%의 제거율을 보이며, 최종 제조된 타이타늄 버튼형 잉곳은 ASTM 규격의 순 타이타늄 등급 3에 해당하는 순도를 보여 VAR(Vacuum Arc Remelting)용 소모성 전극의 제조에 가능한 것으로 확인하였다.

전극형상 변화가 진공차단기내 축방향 자기장 특성에 미치는 영향 (Effects of Electrode Configurations on the Characteristics of Axial Magnetic Fields in Vacuum Interrupter)

  • 황정훈;이종철;김윤제
    • 대한기계학회논문집A
    • /
    • 제32권1호
    • /
    • pp.7-12
    • /
    • 2008
  • The vacuum interrupter (VI) is used for medium-voltage switching circuits due to its abilities and advantages as a compacted environmental friendly circuit breaker. In general, the application of a sufficiently strong axial magnetic field (AMF) permits the arc to be maintained in a diffused mode to a high-current vacuum arc. A full understanding of the vacuum arc physics is very important since it can aid to improve the performance of vacuum interrupter. In order to closely examine the vacuum arc phenomena, it is necessary to predict the magnetohydrodynamic (MHD) characteristics by the multidisciplinary numerical modeling, which is coupled with the electromagnetic and hydrodynamic fields, simultaneously. In this study, we have investigated the effect of changing geometrical parameters for electromagnetic behaviors of high-current vacuum arcs with two different types of AMP contacts, which are coil-type and cup-type, using a commercial finite element analysis (FEA) package, ANSYS. The present results are compared with those of MAXWELL 3D, a reliable electromagnetic analysis software, for verification.

나선형 구조의 VI 전극간의 비틀림 각도가 아크거동에 미치는 영향 (Influence of twisting angle between contacts on arc behavior in spiral type vacuum interrupter)

  • 김병철;박종배;박홍태;강성화;임기조
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
    • /
    • pp.373-375
    • /
    • 2008
  • In this paper the arc behavior in spiral type vacuum interrupter was analyzed by observing taken photographs from high-speed digital camera(10000frame/second) and current-voltage waveform from oscilloscope. As a result, the influence of twisting angle between contacts on arc behavior could be analyzed by matching and comparing arc voltage and photographs simultaneously.

  • PDF

대전력 펄스용 횡자계형 및 종자계형 진공스위치의 에너지 손실 특성 비교 (A Comparison of Energy Loss Characteristics between Radial and Axial Magnetic Field Type Vacuum Switches)

  • 이태호;허창수;이홍식
    • 대한전기학회논문지:전기물성ㆍ응용부문C
    • /
    • 제52권3호
    • /
    • pp.130-136
    • /
    • 2003
  • Crowbar system Vacuum switches, widely used In a pulsed power system, could use the magnetic force to prevent the electrode damage. Vacuum switches using the magnetic forces are classified roughly into RMF(Radial Magnetic Field) and AMF(Axial Magnetic Field) type. The RMF type switches restrain a main electrode from aging due to high temperature and high density arc by rotating the arc which is driven by the Lorenz force. The AMF type switches generate axial magnetic field which decreases the electrode damage by diffusing arc. In this paper, we present the energy loss characteristics of both RMF and AMF type switches which are made of CuCr(75:25 wt%) electrodes. The time-dependent dynamic arc resistance of high-current pulsed discharge in a high vacuum chamber(~10$^{-6}$ Torr). which occurs in RMF and AMF type switches, was obtained by solving the circuit equation using the measured values of the arc voltage and current. In addition, we compared energy loss characteristics of both switches. Based on our results, it was found that the arc voltage and the energy loss of an AMF type switch are lower than a RMF type switch.

아크이미지, 아크전압과 유한요소해석을 통한 나선형 VI 전극 간의 비틀림 각도에 따른 아크거동분석 (Analysis of Arc Behavior as a Function of Twisting Angle Between Contacts in Spiral Type VI by Means of Arc Image, Arc Voltage and FEM)

  • 김병철;박홍태;손진우;임기조
    • 한국전기전자재료학회논문지
    • /
    • 제22권4호
    • /
    • pp.333-341
    • /
    • 2009
  • In this paper arc behavior in spiral type vacuum interrupter(VI) was analyzed by means of arc images, arc voltages and finite element method(FEM). As a result of experiment, the difference of arc voltage was observed under different twisting angles. It was found that the reason of the difference was the difference of arc resistance from simultaneous analysis of arc images and arc voltages. and the difference of arc resistance was explained by Lorentz force calculation with FEM. And the results of calculation were sufficient to explain the experimental results.

진공차단부 대전류 아크 해석: (I)축방향 자기장 (Simulation of High-current Vacuum Arcs: (I)Axial Magnetic Field)

  • 황정훈;이종철;최명준;권중록;김윤제
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2007년도 춘계학술대회B
    • /
    • pp.2500-2505
    • /
    • 2007
  • The vacuum interrupter (VI) is used for medium-voltage switching circuits due to its abilities and advantages as a compact and environmental friendly circuit breaker. In general, the application of a sufficiently strong axial magnetic field (AMF) permits the arc to be maintained in a diffused mode to a high-current vacuum arc. A full understanding of the vacuum arc physics is very important since it can aid to improve the performance of vacuum interrupter. In order to closely examine the vacuum arc phenomena, it is necessary to predict the magnetohydrodynamic (MHD) characteristics by the multidisciplinary numerical modeling, which is coupled with the electromagnetic and hydrodynamic fields, simultaneously. In this study, we have investigated the electromagnetic behaviors of high-current vacuum arcs for two different types of AMF contacts, which are coil-type and cup-type, using a commercial finite element analysis (FEA) package, ANSYS. The present results are compared with those of MAXWELL 3D, a reliable electromagnetic analysis software, for verification.

  • PDF