• 제목/요약/키워드: Arc behavior

검색결과 351건 처리시간 0.029초

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
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    • 제22권4호
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    • pp.333-341
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    • 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.

가스차단기 최적설계를 위한 $SF_6$ 아크 플라즈마 CAE 해석 (CAE Analysis of $SF_6$ Arc Plasma for a Gas Circuit Breaker Design)

  • 이종철;안희섭;김윤제
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2002년도 학술대회지
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    • pp.365-368
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    • 2002
  • The design of industrial arc plasma systems is still largely based on trial and error although the situation is rapidly improving because of the available computational power at a cost which is still fast coming down. The desire to predict the behavior of arc plasma system, thus reducing the development cost, has been the motivation of arc research. To interrupt fault current, the most enormous duty of a circuit breaker, is achieved by separating two contacts in a interruption medium, $SF_{6}$ gas or air etc., and arc plasma is inevitably established between the contacts. The arc must be controlled and interrupted at an appropriate current zero. In order to analyze arc behavior in $SF_{6}$ gas circuit breakers, a numerical calculation method combined with flow field and electromagnetic field has been developed. The method has been applied to model arc generated in the Aachen nozzle and compared the results with the experimental results. Next, we have simulated the unsteady flow characteristics to be induced by arcing of AC cycle, and conformed that the method can predict arc behavior in account of thermal transport to $SF_{6}$ gas around the arc, such as increase of arc voltage near current zero and dependency of arc radius on arc current to maintain constant arc current density.

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Control Strategy of Smoothing Arc for DC Arc Furnace

  • Jung, Kyungsub;Suh, Yongsug;Lee, Yongjoong;Kim, Taewon;Park, Taejun
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2013년도 전력전자학술대회 논문집
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    • pp.354-355
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    • 2013
  • Fundamental features of the arc stability in DC arc furnace of 720V/100kA/72MW have been investigated. Cassie-Mayr arc model has been employed and applied for the target dc arc furnace. In order to characterize the parameters of Cassie-Mayr arc model and the behavior of unstable arc dynamics, the advanced arc simulations of magneto-hydrodynamics (MHD) has been performed. The MHD based arc simulation has been validated in the subcomponent level, for the free burning arc set up in the laboratory. From the results of MHD simulation, dc arc dynamic resistance is proposed to be an effective arc stability function reflecting the instability of dynamic arc behavior. The experimental result confirms the usefulness of proposed dynamic arc resistance as arc stability function. The proposed arc stability function can be regarded as an effective criterion for the overall power conversion system to maintain highly stable arcing operation leading to better productivity and reliability.

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Control Algorithm of Thyristor Rectifier to Improve Arc Stability in DC Arc Furnace

  • Jung, Kyungsub;Suh, Yongsug;Kim, Taewon;Park, Taejun
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2012년도 전력전자학술대회 논문집
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    • pp.371-372
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    • 2012
  • In this paper fundamental features of the arc stability in DC arc furnace of 720V/100kA/72MW have been investigated. Cassie-Mayr arc model has been employed for the target dc arc furnace. In order to characterize the parameters of Cassie-Mayr arc model and the behavior of unstable arc dynamics, the advanced arc simulations of magneto-hydrodynamics (MHD) has been performed. Based on the results of MHD simulation, dc arc dynamic resistance is proposed to be an effective arc stability function reflecting the instability of dynamic arc behavior. The experimental result confirms the usefulness of proposed dynamic arc resistance as arc stability function. The proposed arc stability function can be regarded as an effective criterion for the overall power conversion system to maintain highly stable arcing operation leading to better productivity and reliability.

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아크주에 작용하는 자기구동력에 의한 아크 거동의 변화 (The Change in Arc Behavior by magnetic driving force acting on Arc Column)

  • 조현길;이은웅;김준호;정종호;김일중
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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    • pp.797-798
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    • 2006
  • To investigate a arc behavior when the flux density linking arc current is different, two kinds of models having the different flux density with each other are proposed. Calculations of the flux density and the electromagnetic force acting on arc column using finite element method is described in this paper. And, arc behavior photographs by the high speed camera are illustrated at breaking DC 100V, 100A on the resistance load. So, the arc driving forces are compared with according to the arc types.

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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
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    • 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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    • pp.373-375
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    • 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.

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직렬아크고장 전류에 의한 전선 발화 특성 분석을 통한 아크고장 검출 기술의 개발 (Development of Arc-Fault Detecting Technique through Analysis of Wire Ignition behavior by Series-Arc-Fault Currents)

  • 임용배;전정채;배석명;김태극
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2009년도 춘계학술대회 논문집 전기설비전문위원
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    • pp.205-207
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    • 2009
  • In 2007, 9,128 fires are attributed to electrical equipments. These fires resulted in 29 deaths and 262 injuries. Arc-faults were one of the major causes of these fires. When an unintended arc-fault occurs, it generates intense heat that can easily ignite surrounding combustibles. Conventional circuit breakers only respond to overloads, short circuits, and leakage currents. Therefore, the breakers do not protect against arcing conditions. This paper presents results obtained in experiments on ignition behavior of wire by series arc fault currents and techniques developed to detect the arc-faults. The developed technique was tested after installation to make sure they are working properly and protecting the circuit. If the developed arc detecting technique is applied, the electrical fires caused by an arc-fault can be reduced.

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Comparison of Metal Transfer Behavior in Electrodes for Shielded Metal Arc Welding

  • Xu, X.;Liu, S.;Bang, K.S.
    • International Journal of Korean Welding Society
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    • 제4권1호
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    • pp.15-22
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    • 2004
  • Metal transfer behavior of three shielded metal arc welding electrodes, AWS El1018, E6013 and E6010, were investigated through the characterization of size distribution of droplets and measurement of arc voltage signals. Of the three electrodes, Ell018 electrode showed the largest droplet size with the smallest amount of spatter, while E6010 electrode showed the smallest droplet size with the largest amount of spatter. Even though Ell0l8 electrode showed a good agreement between the frequencies of voltage drop in FFT processed voltage signals and the transfer rate of droplets, E6013 and E6010 electrodes showed weaker correlation because of their dominant explosive transfer behavior. The type of cathode used and electrode baking time also influenced the metal transfer behavior. Compared to bead-on-plate welding using steel plate as a cathode, welding on a water-cooled copper pipe showed less short-circuiting and higher melting rate in all electrodes because of higher arc potential and/or anode drop. When baked for a long time, E6010 electrode showed much more stable arc with less short-circuiting and explosion due to the loss of gas formation ingredients.

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전기로 제강분진에 함유된 금속원소의 휘발거동에 대한 속도론적 연구 (A Study on Kinetic of Volatilization Behavior of Metal Elements Contained in Electric Arc Furnace Dust)

  • 윤재홍;윤치현;이명원
    • 자원리싸이클링
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    • 제26권3호
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    • pp.17-25
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    • 2017
  • 전기로 제강분진은 고철을 전기로에서 용해하는 과정에서 발생하는 휘발성분들이 공기 중의 산소와 반응하여 산화물형태로 포집된 미세분말로써 다양한 특성을 가지고 있다. 이러한 전기로 제강분진의 효율적인 자원화를 위해서 반응속도론적 기초실험과 Pilot 규모의 생산실험을 병행하여 실시하였다. 그 결과 전기로 제강분진은 다양한 구성성분과 화합물로 구성되어 있었으며 공통적으로 Cl과 알카리 성분이 다량으로 존재함에 따라 자원화를 위한 실제 조업에 큰 악영향을 미치는 화합물의 형성이 예상된다. 휘발거동은 $1100^{\circ}C$ 영역에서 활발히 진행되고 $1250^{\circ}C$ 영역에서는 용융현상이 나타남을 확인할 수 있었다. 이러한 결과는 Pilot규모의 실증테스트의 결과로 얻은 조산화아연과 환원철의 형성거동에서도 동일한 결과를 얻었다. 이러한 결과는 전기로 제강분진의 자원화 플랜트의 설계 및 조업조건 설정에 유용한 기초자료로 활용이 기대된다.

우주 환경에서 GHTAW 아크 특성과 용융지 해석에 관한 연구 (A Study on the Arc Characteristics and Weld Pool Analysis of GHTAW under the Space Environment)

  • 이상훈;나석주
    • Journal of Welding and Joining
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    • 제28권4호
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    • pp.67-72
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    • 2010
  • The purpose of this paper is to understand the behavior of GHTAW process under the space environment with the experimental and numerical analysis. Gas Hollow Tungsten Arc Welding (GHTAW) using a hollow tungsten electrode was adopted, since the ignition and discharge of a conventional GTAW process is not appropriate to the space environment due to low pressure in space. In order to clarify the phenomena of GHTAW under space environment, an investigation of thermal and physical properties of the GHTAW arc plasma was experimentally performed under low pressure conditions. Furthermore, the molten pool behavior and weldment of GHTAW were understood by CFD-based numerical analysis, based on the models of GHTA heat source, arc pressure and electromagnetic force induced by arc plasma, the characteristics of which were obtained by the captured images of a CCD camera.