• 제목, 요약, 키워드: arc

검색결과 5,575건 처리시간 0.063초

전기화재 방지를 위한 아크고장전류 차단기 설계 (Arc Fault Circuit Interrupter Design for Electrical Fire Protection)

  • 반기종;김낙교
    • 대한전기학회논문지:시스템및제어부문D
    • /
    • v.55 no.5
    • /
    • pp.220-225
    • /
    • 2006
  • Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, AFCI(arc fault circuit interrupter) 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 fault circuit interrupter does not have the arc current interrupt function. Hence, Arc current controller is designed for the interruption of arc fault current which has the modified arc characteristics.

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
    • /
    • v.22 no.4
    • /
    • 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.

$CO_2$ 아크 용접에서 퍼지 제어기를 이용한 회전 아크센서에 관한 연구 (A Study of Rotating Arc Sensor Using Fuzzy Controller for$CO_2$ Arc Welding)

  • 최영수;박현성
    • 한국공작기계학회논문집
    • /
    • v.13 no.5
    • /
    • pp.110-117
    • /
    • 2004
  • In automatic welding process using a robot, seam tracking is one of the important parts. Sensor for seam tracking is divided broadly into two categories as non contact sensor and contact sensor. The arc sensor is one of the non contact sensors, and it can be applied in weaving arc and rotating arc welding process. In such the arc sensors, rotating arc sensor can be applied to high speed welding over tens of Hz. The decrease of self regulation by high rotating speed causes to improve accuracy and response of sensor. In this study, fuzzy controller was used to track the seam for the $CO_2$ arc welding which had unstable arc. It could be shown that the rotating arc sensor was better than the weaving arc sensor.

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
    • /
    • /
    • pp.365-368
    • /
    • 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.

  • PDF

수정 Sonic Arc 익형의 저속 공력특성 (Low Speed Aerodynamic Characteristic of Modified Sonic Arc Airfoil)

  • 이장창
    • 한국항공우주학회지
    • /
    • v.40 no.2
    • /
    • pp.139-145
    • /
    • 2012
  • 천음속 영역에 적합하도록 개발된 수정 Sonic Arc 익형의 저속 공력특성에 대해 조사하였다. 이 익형은 Schwendenman이 제안한 sonic arc 형상 함수와 NACA0012 형상 data 그리고 상용 프로그램 Maple을 이용하여 설계하였다. 수정 Sonic Arc 익형의 저속공력 특성을 조사하기 위해 마하수 0.3 이하에서 수치해석을 수행하고 그 결과를 NACA0012 익형의 저속 공력성능과 비교분석하였다. 각 마하수에서 수정 sonic arc 익형의 항력은 NACA0012의 항력보다 약 1.5% 정도 작게 나타났으며, 양력 비교에서도 수정 Sonic Arc 익형의 양력은 NACA0012의 양력보다 약 2% 정도 일정하게 작게 나타났다. 또한 각 마하수에서 수정 Sonic Arc 익형의 모멘트 계수는 NACA0012의 값보다 약 1.4% 정도 작게 나타났다.

Arc Fault Circuit Interruption Design

  • Kang, C.S.
    • 한국조명전기설비학회:학술대회논문집
    • /
    • /
    • pp.384-386
    • /
    • 2006
  • In this paper, arc current controller is designed for the interruption of arc fault current which is occurred in the low voltage network. Arc in electrical network have the characteristics of low current, high impedance and high frequency. Conventional controller does not have the arc current interrupt function. Hence, arc current controller is designed for the interruption of arc fault current.

  • PDF

DC 전류에 의한 직렬 아크 특성 분석 (Analysis of Serial Arc with DC Current)

  • 반기종;남문현;김낙교
    • 대한전기학회:학술대회논문집
    • /
    • /
    • pp.1700-1701
    • /
    • 2007
  • DC Arc Fault Current is an electric discharge which is occurred in two opposite electrode. In this paper, DC arc detection device is designed for the display of DC arc fault current which is occurred in the local electric network with DC Power. This DC arc is one of the main causes of electric fire. Arc fault in electrical network has the characteristics of low current, high impedance and low frequency. DC Arc current detection device is designed for the display of arc fault current which has the modified arc characteristics.

  • PDF

A Study on Arc Force Sensor for a Robotic Welding Control System

  • Son, Joon-Sik;Kim, Ill-Soo;Choi, Seung-Gap;Kueon, Yeong-Seob;Lee, Duk-Man
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.128.5-128
    • /
    • 2001
  • This paper presents investigation of an arc force sensor for a robotic welding control system. Arc force sensor is employed in this research to monitor the bead geometry of the arc welding process. Arc force sensor mounted at the end of the robot wrist was employed to measure the arc force applied to the weld. Experimental configuration for measurement of arc force was used to quantify the changes in the arc force distributions of the plate being welded. A relationship between the bead dimension and the arc force distributions was established. The sensor information was used to establish a relationship between welding current and arc force. Arc force sensor have shown to be one of the most sophisticated technique to monitor perturbations that occurred during robotic arc welding process.

  • PDF

황축교류자계에 의한 대기중에서의 교류 아아크의 이동에 관한 연구 (A study on the A.C. arc movement in a transverse A.C. magnetic field at atmospheric pressure)

  • 전춘생;엄기환
    • 전기의세계
    • /
    • v.24 no.6
    • /
    • pp.77-84
    • /
    • 1975
  • This paper treats A.C. arc movement in a transverse A.C. magnetic field at atmospheric pressure with the purpose of selecting electrode materials and obtaining detailed data for design of A.C. air circuit breaker, plasma accelerator and plasma jet. Arc velocities in transverse magnetic field are measured by varying arc current, arc voltage, gap length, magnetic flux density and the erosion of electrode surface, which influence arc velocities. The main results are; 1)Arc velocities in transverse magnetic field have different values according to electrodes of various materials and decrease in a descending order of cold cathode, medium cathode and hot cathode. 2)Arc velocities in transverse magnetic field increases with arc current, arc voltage, gap length and magnetic flux densith and on the other hand decrease with the increase of electrode surface erosion. 3)D.C.arc velocity in D.C. magnetic field is higher than A.C. arc velocity in A.C. magnetic field of the same value.

  • PDF

ARC SHIFT NUMBER AND REGION ARC SHIFT NUMBER FOR VIRTUAL KNOTS

  • Gill, Amrendra;Kaur, Kirandeep;Madeti, Prabhakar
    • 대한수학회지
    • /
    • v.56 no.4
    • /
    • pp.1063-1081
    • /
    • 2019
  • In this paper, we formulate a new local move on virtual knot diagram, called arc shift move. Further, we extend it to another local move called region arc shift defined on a region of a virtual knot diagram. We establish that these arc shift and region arc shift moves are unknotting operations by showing that any virtual knot diagram can be turned into trivial knot using arc shift (region arc shift) moves. Based upon the arc shift move and region arc shift move, we define two virtual knot invariants, arc shift number and region arc shift number respectively.