• Title/Summary/Keyword: AC arc

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A study on the suppress method of arc on a electromagnetic contactor (전자개폐기의 arc 억제방안에 관한 연구)

  • 노창주;홍순일;정승환
    • Journal of Advanced Marine Engineering and Technology
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    • v.7 no.1
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    • pp.40-48
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    • 1983
  • Nowadays electromagnetic contactors are used for power on-off in various electrical loads. If the severe arc are occurred when power off, the magnetic contactor can not long run because of damage of contactor. In this paper, Authors indicate a method of how to minimize the arc when power off, Authors contrived a electronic circuit which can adjust the demagnetizing point of electro magnetic contactor, and control the demagnetizing point, utilizing our circuit, so as to occur the extinguish of arc at near the AC current zero point which is indispensibly exists. From the results of study, Authors could get confirmations the AC circuit could cut off with occurrence of mininum arc, and that possibility of extensive utilization of our method to hightension circuit.

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Analysis of AC Arc-Welders Using FEM (유한요소법을 이용한 교류아크용접기의 해석)

  • Nam, Jae-Ho;Kuc, Tae-Yong;Jang, Young-Hak
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.53-55
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    • 1996
  • In this paper, we analyze control methods and structures of AC arc-welders, which is a prerequisite to develop a low-cost and high accurate welder. By using the finite element methods, three types of AC an-welders, movable-core, movable-coil, and saturated-reactor type, are modeled and characterized in the coupled domain of electro-magnetic system.

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Operating Characteristics of Arc-induction Type DC Circuit Breaker (아크유도형 DC 차단기의 동작 특성)

  • Park, Sang-Yong;Choi, Hyo-Sang
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.7
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    • pp.981-986
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    • 2018
  • AC(alternating current) CB(circuit breaker) at the fault occurred in the existing AC distribution system is limiting the fault current through zero cross-point. However, DC(direct current) CB does not have zero cross-point. Therefore, arc occurred by on-off operation of DC CB is very huge. Nowadays, many research team are studying the way to decrease breaking time, which is one of the essential conditions in DC CB. We suggested novel arc-induction type DC CB in this paper. The proposed arc-induction type DC CB is composed of the mechanical Arc ring and DC CB. We confirmed the operation of arc-induction type DC CB through the HFSS(High Frequency Structure Simulator) 3D simulation program and performed the experiment for operation characteristics. Results showed that arcing time of the arc-induction type DC CB by using induction ring was faster than existing mechanical DC CB. On the transient system, we confirmed stable operation characteristics of the arc-induction type DC CB through the simulation and experimental results. We expect that the proposed arc-induction type DC CB technology is will go to stay ahead of the existing DC CB technology.

Basic Performance Test of a Three Phase AC Arc Plasma Torch System for Plasma Gas Reforming (플라즈마 가스 개질 응용을 위한 3상 아크 플라즈마 토치 시스템 특성 실험)

  • DONG-HYUN LEE;DARIAN FIGUERA-MICHAL;HAE-WON PARK;NAM-KI LEE;SANG-YUN PAEK;SHIYOUNG YANG;JUN-HO SEO
    • Transactions of the Korean hydrogen and new energy society
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    • v.34 no.1
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    • pp.8-16
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    • 2023
  • In this work, we report basic performance test results of a lab-scale three phase alternative current (AC) arc plasma torch system for plasma gas reforming applications. The suggested system primarily consists of three graphite electrodes inclined at 12.5° to the central axis, a 𝞥 150 mm cylindrical gas path and a three phase-60 Hz AC power supply. At air flow rate of 50 Lpm and arc currents of 100-175 A, test results revealed that plasma resistances were decreasing from 1.08 Ω to 0.53 Ω with the increase of plasma power from 9.3 kW to 13.8 kW, causing the decrease of power factor and increase of the line voltages. However, the injected air can be heated quickly up to the temperatures of >1,200℃ when injecting AC arc plasma powers of >10 kW.

Improvement of Welding Performance of MIG Arc Welding using Superposition Ac Pulse (MIG 아크용접에서의 교류중첩펄스를 이용한 용접성능향상)

  • Kim, Tae-Jin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.10
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    • pp.141-149
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    • 2008
  • Because aluminum has a lighter weight and higher strength than iron, it is frequently used in the transportation industry for the purpose of reducing the weight of a chassis, and thereby increasing fuel efficiency. However, there are some difficulties with arc welding aluminum due to its lower melting point, high thermal conductivity and oxidation coating on its surface. This study proposed using superposition ac pulse MIG arc welding, which has been improved from the pulse waveform of conventional MIG welding. A MIG arc welding power source was developed to test the effectiveness of this method.

Magnetic field Reduction characteristics of double shielding wear for a worker by using AC Arc welder (교류 아크용접기를 사용하는 작업자의 이중차폐복 자계저감 특성검토)

  • Park, Jun-Hyeong;Min, Suk-Won
    • Proceedings of the KIEE Conference
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    • 2008.10a
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    • pp.73-74
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    • 2008
  • This paper analyses current densities induced inside a worker using AC arc welder when he wear a protective with double shielding cloth. Applying the boundary element method, we calculate current densities induced in organs inside a worker in case he was located at 1[cm] far from a power cable of AC arc welder. As results of study, we fined aa protective cloth, which has high permeability in inner layer and high conductivity in outer layer, can give a higher shielding efficiency.

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Magnetic field Reduction characteristics of shielding wear for a worker by using AC Arc welder. (교류 아크용접기를 사용하는 작업자의 차폐복 자계저감 특성검토)

  • Park, Jun-Hyeong;Min, Suk-Won
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1343-1344
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    • 2008
  • This paper analyses current densities induced inside a worker using AC arc welder when he wears a protective cloth. Applying the boundary element method, we calculate current densities induced in organs inside a worker in case he was located at 1[cm], 15[cm], 20[cm] far from a power cable of AC arc welder. As results of study, we find a maximum current density induced in all organs may be lower than 10[$mA/cm^2$] if he wears a protective cloth. We also know high permeability materials can lower current density more than high conductivity materials.

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Magnetic Field Reduction Characteristics of Shielding Wear Materials for Workers Using AC Arc Welder (교류 아크용접기를 사용하는 작업자의 차폐복 재질에 따른 자계저감 특성검토)

  • Park, Jun-Hyeong;Min, Suk-Won;Lee, Seung-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.7
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    • pp.1265-1271
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    • 2010
  • Power cable of an AC arc welder can surround a body of worker at the moment of welding. Applying the boundary element method, we calculated current densities induced in organs inside a worker to study the magnetic field reduction characteristics of shielding wear materials. We knew shielding wear with high permeability materials lowers current density more than high conductivity materials. We also found current density was lowest when high permeability materials were inside high conductivity materials in double layer shielding wear.

A Study On Power Factor Correction of SMAW(shielded metal-arc welding) Using Single Phase AC/DC Boost Converter (단상 AC/DC 승압형 컨버터를 이용한 피복 아크 용접기 역률 개선에 관한 연구)

  • Yu Y. J.;Kim L. H.;Kim J. H.;Won C. Y.;Kim Y. R.;Lee S. Y.
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.556-559
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    • 2001
  • In this paper, we proposed AC/DC boost converter to improve input current harmonic reduction in SMAW(shielded metal-arc welding). The proposed harmonic reduction with the boost converter design and the UC2854 integrated circuit which controls the converter, The topology of welding power supply is made of a pair of boost converter and welder half-bridge IGBT inverter. The voltage arc is modeled by a variable resistance in series with a voltage source. The results has been confirmed by PSIM simulation tool. The simulation results show that input at current is nearly sinusoidal with low harmonic contents and sinusoidal input current waveform at high power factor.

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Analyses on Current Densities Induced Inside a Worker Using AC Arc Welder (교류 아크용접기를 사용하는 작업자의 인체 유도전류밀도 해석)

  • Park, Jun-Hyeong;Min, Suk-Won
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1410-1411
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    • 2007
  • This paper analyses current densities induced inside a worker using AC arc welder. Applying the boundary element method, we calculate current densities induced in organs inside a worker in case he was located at 1[cm], 3[cm], 5[cm], 10[cm], 15[cm], 20[cm] far from a power cable of AC arc welder. As results of study, we find a maximum current density induces at a heart surface and may be higher than 10[$mA/m^2$] of ICNIRP guideline if he works within 15[cm] from a power cable.

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