• Title, Summary, Keyword: Electric device

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A Study on Electromagnetic Interference of Electric Vehicles with Variations of Charging Device Inlet Location (전기자동차 충전구 위치에 따른 전자파 방사특성에 관한 연구)

  • Gwon, Sunmin;Woo, Hyungu
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.6
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    • pp.694-701
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    • 2016
  • According to revolutionary developments in automobile technologies, eco-friendly advanced vehicles (hybrid vehicle, hydrogen fuel-cell vehicle, electric vehicle, etc.) are rapidly increasing. The electromagnetic compatibility is getting more important for development of a vehicle because those advanced vehicles are driven by electric energy and equipped with more electric systems. In general, electromagnetic compatibility tests consist of an electromagnetic interference(EMI) test and an electromagnetic susceptibility(EMS) test. EMI test of the electric vehicles are needed not only in driving mode but also in charging mode because they must be recharged by much electric energy for driving. Depending on vehicle manufacturers, the charging device type and the location of charging device inlet in electric vehicles are various. In this paper, in order to investigate EMI of electric vehicles in charging mode in consideration of the direction of measuring antenna and the location of charging device inlet, a series of electromagnetic emission tests are conducted using three electric vehicles (neighborhood electric vehicle, electric vehicle and electric vehicle-bus). The test results show that electromagnetic emission measurements in charging mode are dependent on the direction of measuring antenna and the location of charging device inlet.

Procedure for Uncertainty Evaluation of a Precision Electric Force Measuring Device and Its Application (고정밀 전기식 힘측정기의 불확도평가 절차 및 응용)

  • Kim, Gab-Soon;Kang, Dae-Im
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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    • pp.161-167
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    • 1999
  • This paper describes the calibration method and the calculation equations of expanded uncertainty for a precision electric force measuring device. The calibration of the electric force measuring device is performed three times (0 ${\circ}$(first time), $120{\circ}$(second time), $240{\circ}$(third time)) at each calibration point. It is usually selected ten points from zero load to rated load of the electric force measuring device. The expanded uncertainty is calculated by combining A type standard uncertainty and B type standard uncertainty. The calibration method and the calculation equations of expanded uncertainty can be widely used in the calibration of the precision electric force measuring device.

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The Characteristics of Electric Shock Accidents and Their Countermeasures for Portable Electrical Tools (이동형 전기기기의 감전재해 특성 및 그 대책)

  • Choi, Sang-Won
    • Journal of the Korean Society of Safety
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    • v.32 no.2
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    • pp.21-26
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    • 2017
  • According to the data of Korea Occupational Safety and Health Agency, electric shock accidents during recent 11 years exceeded more than 60% in architecture/other and construction work, the countermeasures for safety are required in the harsh environment of a construction site where moving electric machines and equipments are widely used. The establishment of countermeasure for insulation degradation and defect is required, in consideration of increasing trend for accidents caused by defective insulation among low voltage electrical installation each year. The aim of this study is to propose the policy about portable electrical tool standards and/or worker's safety standards for preventing electric shock accidents on safety workings, and is to develop the technology and the safety device to prevent electric shock for accident prevention reduction through experiments. It obtained the followings through this study; statistical data analysis of late about 10 years of electric shock-related industrial accidents analysis and portable electric tools; safety device development of 'device for testing continuous grounding and power shut-down' to prevent electric shock from portable electric tools. Furthermore, developed results and proposal in this study will help to prevent the electric shock accidents from portable electric tools and will be expected the utilization of policy formulation, educational data and field supplement of the safety device, and etc.

The Development Plan of the Protection Device Auto-coordination Program in the Distribution Automation System (배전자동화 적용선로 보호기기 자동정정 프로그램 개발)

  • Kang, Moon-Ho;Ha, Bok-Nam;Lim, Seong-Il;Cho, Nam-Hun;Lee, Heung-Ho
    • Proceedings of the KIEE Conference
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    • pp.129-131
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    • 2001
  • In order to improve the reliability of power service and the effective management of distribution power system. DAS (Distribution Automation system) is widely used in KEPCO(Korea Electric Power Corporation) branch offices. Based on the present protective device coordination program which used in KEPCO. this study presents the new concept about both protective device coordination program maximizing the characteristics of DAS and development plan of protective device auto-coordination program with the merits of DAS.

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The effect of RF electric fields from an atmospheric micro-plasma needle device on the death of cells (침형 상압 마이크로 플라즈마 장치에서 발생하는 전기장이 세포 사멸에 미치는 효과)

  • Yoon, Hyun-Jin;Shon, Chae-Hwa;Kim, Gyoo-Cheon;Lee, Hae-June
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.12
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    • pp.2249-2254
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    • 2008
  • A non-thermal micron size plasma needle is applicable for medical treatment because it includes radicals, charged particles, ultraviolet emission, and strong electric fields. The electric fields around the plasma needle device driven by a radio frequency wave are investigated in order to calculate the power delivered to the cell. A commercial multi-physics code, CFD-ACE, was utilized for the calculation of electric fields for the optimization of the needle structure. The electric field and energy absorption profiles are presented with the variation of the device structure and the distance between the needle and tissues. The living tissues effectively absorb the radio frequency power from the plasma needle device with the covered pyrex structure.

Aging Characteristic on the Magnetic Properties of Non-oriented Silicon Steel (무방향성 규소강판에서 열화특성이 자기적 성질에 미치는 영향)

  • Kim, Hyung-Wook;Kim, In-Sung;Jeong, Soon-Jong;Min, Bok-Gi;Song, Jea-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.242-242
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    • 2007
  • 무방향성 규소강판을 lamination core 형태로 제작하여 자기적 특성을 조사 하였다. 그 결과 1차, 2차 권선수가 400turns 시료에서 보자력(Hc)과 포화자속밀도(Bs)는 최대값을 나타내었고, 보자력은 0.05Oe, 포화자속밀도는 1.8T 이었다. 현재 국내에서 생산되고 있는 무방향성 규소강판의 자속밀도값 보다 더 우수한 강을 나타내었으며, 열화특성이 자기적 특성에 미치는 영향을 통해 고효율 무방항성 규소강판 개발의 가능성을 확인하였다.

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Korean Institute of Electrical and Electronic Materials (규소강판 코어소재의 가공 방법에 따른 철손 특성)

  • Kim, I.S.;Jeong, S.J.;Min, B.K.;Kim, H.W.;Song, J.S.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.343-344
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    • 2006
  • 방향성 규소강판을 tape-wound core 형태로 제작하여 가공방법에 따른 자기적 특성을 조사 하였다. 그 결과 곡률반경이 40mm인 시료에서 보자력(Hc)과 포화자속밀도(Bs)는 우수한 값을 나타내었고, 보자력은 0.02Oe, 포화자속밀도는 1.85T 이었다. 현재 국내에서 생산되고 있는 방향성 규소강판의 자속밀도값 보다 우수한 값을 나타내었다. 본 연구로부터 방향성 규소강판을 이용하여 권자심을 제작할 때 도입되는 탄성변형에 대한 대책의 중요성과 코어 소재의 가공방법이 자기적 특성에 미치는 영향을 통해 고효율 방향성 규소강판 개발의 가능성을 확인하였다.

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Korean Institute of Electrical and Electronic Materials (방향성 규소강판에서 열화특성이 자기적 성질에 미치는 영향)

  • Kim, Hyung-Wook;Kim, In-Sung;Jeong, Soon-Jong;Min, Bok-Ki;Song, Jea-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.245-246
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    • 2006
  • 방향성 규소강판을 tape-wound core 형태로 제작하여 $N_2$ gas 분위기에서 $760^{\circ}C$ 4 시간동안 열처리후 자기적 특성을 조사 하였다. 그 결과 1차, 2차 권선수가 85 turns 시료에서 보자력(Hc)과 포화자속밀도(Bs)는 최대값을 나타내었고, 보자력은 0.019Oe, 포화자속밀도는 1.92T 이었다. 현재 국내에서 생산되고 있는 방향성 규소강판의 자속밀도값 보다 더 우수한 값을 나타내었으며, 열화특성이 자기적 특성에 미치는 영향을 통해 고효율 방향성 규소강판 개발의 가능성을 확인하였다.

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A Study of DC Arc Detection Device (DC Arc 검출장치에 대한 연구)

  • Ban, Gi-Jong;Kim, Lark-Kyo;Nam, Moon-Hyun
    • Proceedings of the KIEE Conference
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    • pp.98-100
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    • 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.

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A Study on the Test Method of Local Information Processing Device in Digital Substation Based on IEC 61850 (IEC 61850 기반 디지털변전소 현장정보처리장치 시험 방법에 관한 연구)

  • Kim, Nam-Dae;Kim, Woo-Jung;Lee, Nam-Ho;Kim, Seok-Kon;Jang, Byung-Tae
    • KEPCO Journal on Electric Power and Energy
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    • v.6 no.3
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    • pp.253-257
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    • 2020
  • The local information processing devices are devices that process information by converting voltage, current, and digital electric signals from legacy-type power facility into IEC 61850 based data. It acquires and processes the operation information of legacy-type power facility, performs control of power facility, and interlock function using internal logic. In particular, the time to convert data to process input and output information for a device is important because a number of protection relay input and output signals are handled by only one device. This paper introduces test methods and cases for measuring IEC 61850 communication function and input/output data conversion time of local information processing device.