• Title, Summary, Keyword: arc

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Development of Arc Sensor Model Using Regression Analysis and Artificial Neural Network in $CO_2$ Arc Welding (탄산 가스 아크 용접에서 회귀 분석과 인공 신경망을 이용한 아크 센서 모델 개발)

  • 김용재;이세헌
    • Journal of Welding and Joining
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    • v.20 no.6
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    • pp.776-782
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    • 2002
  • The experimental model of arc sensor in $CO_2$ arc welding has been individually developed according to welding condition and welding procedure. Therefore, the development of new arc sensor having the features of all conventional arc sensor is important in point of its application to various welding environment. In this study, the arc sensor experimental models comprised of a regression model and noise term were formulated using conventional arc sensing algorithm such as current area difference, current integration difference and weaving end current difference method, and their features were observed. The new regression arc sensor model was suggested using multiple linear regression analysis using current variables as independent variables of regression analysis. The artificial neural network model was also suggested where current variables and offset distance was used input/out variables of input/output node.

Development of GIS-based Arc River Data Model for Building Three-dimensional River Information System (3차원 하천정보화시스템 구축을 위한 GIS 기반 Arc River 데이터 모델 개발)

  • Kim, Dong-Su
    • Proceedings of the Korea Water Resources Association Conference
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    • pp.214-214
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    • 2012
  • 본 논문은 최근 세계적으로 활발히 진행되고 있는 수리정보화시스템의 한 부분이 될 수 있는 하천정보화시스템의 구축의 근간이 되는 3차원 하천 자료 모형으로 개발된 아크리버 (Arc River)자료 모형을 소개한다. Arc River는 지리정보시스템(GIS)에 기반하여 수립되었고 최신 하천 유동 및 하상 계측기법으로 확보된 방대한 양의 관측 자료를 수집, 저장, 처리, 검색, 그리고 분석할 수 있게 하는 표준화된 자료 모형 (data model)이다. Arc River는 지난 10년간 유역 자료 모형의 표준으로 사용되어 온 Arc Hydro 모델의 한계를 극복하여 3차원에서 시공간적으로 변화하는 복수의 하천 관측 자료를 효율적으로 연계하고 GIS에서 활용할 수 있도록 설계되었다. 본 논문은 Arc River의 다양한 설계 원리에 대해 설명하고 실제 ADCP 자료를 활용하여 활성화된 Arc River의 예를 제시한다. Arc River는 향후 하천을 유지, 관리, 해석에 있어 필요한 3차원 하천정보화시스템의 구축의 근간을 이루고 국내에서도 그 활용을 범위를 넓힐 것으로 기대한다.

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Interruption Controller Design of Arc current With Custom Electric Source (아크의 방전에 따른 전기안전에 미치는 영향)

  • Ban, Gi-Jong;Lim, Seung-Ha;Won, Young-Jin
    • Proceedings of the IEEK Conference
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    • pp.1283-1286
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    • 2005
  • Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, arc current control algorithm is designed for the interruption of arc fault current which is occurred in the local electric network. This arc is one of the main causes of electric fire. Arc fault in electrical network has the characteristics of low current, high impedance and high frequency. Conventional arc current controller does not have the arc current interrupt function. Hence, Controller of arc current is designed for the interruption of arc fault current which has the modified arc characteristics.

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New Arc Chamber to Improve Breaking Capacity (차단용량 향상을 위한 신소호 구조)

  • Park, Jin-Young;Cho, Hea-Yong
    • Journal of the Korean Society of Marine Engineering
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    • v.36 no.2
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    • pp.321-326
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    • 2012
  • The mechanism unit, arc chamber and trip unit are imperative components of MCCB which will decide the level of performance of MCCB. Among them, Arc chamber unit is used for extinguishing arc rapidly of fault current and induce the arc inside of grid. At that time inducing arc will split into parts and cooled rapidly so the arc would disappear. This paper suggests new arc chamber unit to improve arc extinguishing performance with optimum design and are applied to actual products based on the results.

A Study on the Development of Arc Sensor for Flux Cored Arc Welding Process and its Application for Seam Tracking (Flux Cored Arc용접용 아크센서의 개발 및 이를 이용한 용접선 추적에 관한 연구)

  • 김수영;이승영;나석주
    • Journal of Welding and Joining
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    • v.10 no.4
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    • pp.190-198
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    • 1992
  • Among the variety of welding processes available, the flux cored arc welding is one of the most frequently used process, because of its wide range of application and high productivity. The weld joint tracking is indispensable to improve the flexibility of the arc welding robot application for the flux cored arc welding (FCAW) process. In this study, an arc sensor which utilizes the electrical signal obtained from the welding arc itself was developed for weld joint tracking in FCAW. Because a model of the welding arc in flux cored arc welding was required to develop the arc sensor, a mathematical model was proposed by analysing the welding arc behaviour, and also an experimental model by using the factorial experiment and least square method. For overcoming the fluctuation in the welding current signal during tracking the weld joint, it was fitted to a curve which is inversely proportional to a trace of tip-to-workpiece distance by using the quadratic curve-fitting method.

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Arc Detection and Interruption Algorithm Design for Fire Protection (화재 방지를 위한 아크전류 검출 제어기 설계)

  • Ban, Gi-Jong;Won, Young-Jin;Lim, Seung-Ha
    • Journal of the Institute of Electronics Engineers of Korea TE
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    • v.42 no.3
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    • pp.19-24
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    • 2005
  • Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, arc current control algorithm is designed for the interruption of arc fault current which is occurred in the local electric network. This arc is one of the main causes of electric fire. Arc fault in electrical network has the characteristics of low current, high impedance and high frequency. Conventional arc current controller does not have the arc current interrupt function. Hence, Controller of arc current is designed for the interruption of arc fault current which has the modified arc characteristics.

The Effect of Configuration and Surface Polishing in Tungsten Electrode Tip for Gas Tungsten Arc Welding on the Arc Characteristics (GTA용접용 텅스텐 전극팁의 형상과 연마 상태가 아크특성에 미치는 영향)

  • 조상명;서상균
    • Journal of Welding and Joining
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    • v.19 no.1
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    • pp.33-39
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    • 2001
  • The welding quality by Gas Tungsten Arc Welding shows very high level, but the welding speed is lower than that of gas metal arc welding. Also, the welding quality by automatic GTAW is variable as the arc characteristics is changed by the consumption of electrode tip. The purpose of this study is to investigate the relation between the properties of tungsten electrode tip and the various arc characteristics at high current region. In this study, the high welding current 200A was applied to the repeated arc start test and long term arcing test using the $\phi$3.2 tungsten electrodes with cone angle 30$^{\circ}$, 45$^{\circ}$, 60$^{\circ}$sharp tip, and 60$^{\circ}$surface polished (S.P.) sharp tip. It was confirmed that the maximum arc pressure by the initial electrode condition was highest in 45$^{\circ}$sharp tip, and the next in 60$^{\circ}$sharp tip, the last was in 30$^{\circ}$sharp tip and 60$^{\circ}$S.P.. But, the maximum arc pressure after the repeated arc start test and long term arcing test was decreased considerably. But, the maximum arc pressure was highest also in 45$^{\circ}$ sharp tip after the tests, the next was in 30$^{\circ}$sharp tip, and the last was in 60$^{\circ}$sharp tip and 60$^{\circ}$S.P.. The arc start characteristics was the most excellent in 60$^{\circ}$S.P., By long term arcing test, the lanthania included in tungsten electrode was extinguished at tip surface preferentially, therefore the arc characteristics of electrode tip got worse.

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A Study of Harmonics by Arc Furnace Operating for Demand Side Management (수요관리를 위한 아크로 운전 상태에 따른 고조파 연구)

  • Park, Kyung-Ho;Kim, Jae-Chul;Park, Hyun-Teak;Im, Sang-Kug;Oh, Dong-Whan
    • Proceedings of the KIEE Conference
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    • pp.17-19
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    • 2003
  • Electric arc furnace has consumed plenty of power. Hence electric arc furnace can be expected to use for demand side management. When electric arc furnace use for demand side management, electric arc furnace frequently occur a starting and a stop. Electric arc furnace irregularity change consumption of power. Due to character of time-varing and non-linear, electirc arc furnace has a problem with voltage quality(flicker, harmonics). Producted harmonic in electric art furnace is different any harmonic source because of electric arc furnace peculiar operating. Accordingly, analysis for generated harmonic in electric arc furnace operating is demanded. This paper analyze effect of harmonic by arc furnace operating.

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AFCI algorithm design without sensor (센서없는 AFCI 알고리즘 설계)

  • Ban, Gi-Jong;Choi, Sung-Dai;Ho, Yoon-Kwang;Kim, Sang-Hoon;Nam, Moon-Hyon;Kim, Lark-Kyo
    • Proceedings of the KIEE Conference
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    • pp.231-233
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    • 2006
  • Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, arc current control algorithm is designed for the interruption of arc fault current which is occurred in the low voltage network. This arc is one of the main causes of electric fire. General arc current sensor has troubles for detecting arc currents, thus we would like to propose the arc current detection method without current sensor. In this paper, arc discharge currents within power lines are being detected through the arc current control algorithm.

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NUMERICAL ANALYSIS OF AN ARC PLASMA IN A DC ELECTRIC FURNACE

  • Lee Yeon Won;Lee Jong Hoon
    • 한국가시화정보학회:학술대회논문집
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    • pp.30-33
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    • 2004
  • In order to analyze the heat transfer phenomena in the plasma flames, a mathematical model describing heat and fluid How in an electric arc has been developed and used to predict heat transfer from the arc to the steel bath in a DC Electric Arc Furnace. The arc model takes the separate contributions to the heat transfer from each involved mechanism into account, i.e. radiation, convection and energy transported by electrons. The finite volume method and a SIMPLE algorithm are used for solving the governing MHD equations, i.e., conservation equations of mass, momentum, and energy together with the equations describing a standard $k-\varepsilon$ model for turbulence. The model predicts heat transfer for different currents and arc lengths. Finally these calculation results can be used as a useful insight into plasma phenomena of the industrial-scale electric arc furnace. from these results, it can be concluded that higher arc current and longer arc length give high heat transfer.

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