• Title, Summary, Keyword: arc

Search Result 5,575, Processing Time 0.036 seconds

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

  • Ban, Gi-Jong;Kim, Lark-Kyo
    • The Transactions of the Korean Institute of Electrical Engineers D
    • /
    • 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.

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 (아크이미지, 아크전압과 유한요소해석을 통한 나선형 VI 전극 간의 비틀림 각도에 따른 아크거동분석)

  • Kim, Byoung-Chul;Park, Hong-Tae;Son, Jin-Woo;Lim, Kee-Joe
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • 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.

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

  • Choi Youngsoo;Park Hyunsung
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • 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.

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

  • Lee Jong C.;Ahn Heui-Sub;Kim Youn J.
    • Proceedings of the KSME Conference
    • /
    • /
    • 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

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

  • Lee, Jang-Chang
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.40 no.2
    • /
    • pp.139-145
    • /
    • 2012
  • The low speed aerodynamic characteristics of modified sonic arc airfoil which is developed to fit the transonic regime are investigated. This airfoil is designed by using the shape function of sonic arc proposed by Schwendenman, the data of NACA0012, and commercial program Maple. In order to investigate the low speed aerodynamic characteristic of sonic arc airfoil, the numerical analysis is conducted below Mach number 0.3 and the results are compared and analyzed with it of NACA0012 airfoil. At each Mach number, the drag of modified sonic arc airfoil is less 1.5% than NACA0012's drag and the lift of modified sonic arc airfoil is less 2% than NACA0012's lift. The moment coefficient of modified sonic arc airfoil is also less 1.4% than it of NACA0012 at each Mach number.

Arc Fault Circuit Interruption Design

  • Kang, C.S.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • /
    • 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

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

  • Ban, Gi-Jong;Nam, Moon-Hyun;Kim, Lark-Kyo
    • Proceedings of the KIEE Conference
    • /
    • /
    • 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

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

  • 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
    • Journal of the Korean Mathematical Society
    • /
    • 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.