• Title/Summary/Keyword: Radiated fields

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Proposing a low-frequency radiated magnetic field susceptibility (RS101) test exemption criterion for NPPs

  • Min, Moon-Gi;Lee, Jae-Ki;Lee, Kwang-Hyun;Lee, Dongil
    • Nuclear Engineering and Technology
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    • v.51 no.4
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    • pp.1032-1036
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    • 2019
  • When the equipment which is related to safety or important to power production is installed in nuclear power plant units (NPPs), verification of equipment Electromagnetic Susceptibility (EMS) must be performed. The low-frequency radiated magnetic field susceptibility (RS101) test is one of the EMS tests specified in U.S NRC (Nuclear Regulatory Commission) Regulatory Guide (RG) 1.180 revision 1. The RS101 test verifies the ability of equipment installed in close proximity to sources of large radiated magnetic fields to withstand them. However, RG 1.180 revision 1 allows for an exemption of the low-frequency radiated magnetic susceptibility (RS101) test if the safety-related equipment will not be installed in areas with strong sources of magnetic fields. There is no specific exemption criterion in RG 1.180 revision 1. EPRI TR-102323 revision 4 specifically provides a guide that the low-frequency radiated magnetic field susceptibility (RS101) test can be conservatively exempted for equipment installed at least 1 m away from the sources of large magnetic fields (>300 A/m). But there is no exemption criterion for equipment installed within 1 m of the sources of smaller magnetic fields (<300 A/m). Since some types of equipment radiating magnetic flux are often installed near safety related equipment in an electrical equipment room (EER) and main control room (MCR), the RS101 test exemption criterion needs to be reasonably defined for the cases of installation within 1 m. There is also insufficient data regarding the strength of magnetic fields that can be used in NPPs. In order to ensure confidence in the RS101 test exemption criterion, we measured the strength of low-frequency radiated magnetic fields by distance. This study is expected to provide an insight into the RS101 test exemption criterion that meets the RG 1.180 revision 1. It also provides a margin analysis that can be used to mitigate the influence of low-frequency radiated magnetic field sources in NPPs.

A Study on the Radiated Emission from the DC Power-Bus for the PCB (PCB DC Power-Bus로부터의 전파 방사에 관한 연구)

  • Kahng, Sung-Tek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.2 s.105
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    • pp.148-151
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    • 2006
  • The DC power-bus' resonance is frequently attributed to EMI sources in the PCBs. Subsequently, it will ruin the digital signal integrity within one system or between adjacent systems in the form of conducted or radiated emission. Hence, since it is of importance to examine the PCB's emission, this paper sheds a light on the radiated emission from the power-bus with regards to its resonance modes. A full-wave analysis method is used to calculate the impedance and radiated electric fields and is validated by physics and an EM analysis tool.

A study on the radiated emission from the DC power-bus for the PCB (PCB DC power-bus로부터의 전파방사에 관한 연구)

  • Kahng, Sung-Tek
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.149-152
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    • 2005
  • The DC power-bus' resonance is frequently attributed to EMI sources in the PCBs. Subsequently, it will ruin the digital signal integrity within one system or between adjacent systems in the form of conducted or radiated emission. Hence, since it is of importance to examine the PCB's emission, this paper sheds a light on the radiated emission from the power-bus with regards to its resonance modes. A full-wave analysis method is used to calculate the impedance and radiated electric fields and is validated by physics and an EM analysis tool.

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Characteristics of Radiated Electromagnetic Fields From A Cylindrical Cavity (원통형 캐비티에서 방출되는 방사 전자파 특성)

  • Kim, Hyo-Gyun;Cho, Jun-Ho;Lim, Dong-young;Kim, Ki-Chai
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.2
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    • pp.237-244
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    • 2016
  • This paper, presents the characteristics of electromagnetic fields radiated from a pole-transformer. The cylindrical cavity is used to measure electromagnetic fields radiated from a pole-transformer when partial discharge occures inside the pole-transformer. The theoretical analysis is conducted by a finite difference time domain (FDTD) method. As a result, frequency characteristics of the radiated electromagnetic waves emitted from the inside the cavity to the outside through the 1st and 2nd bushings could be observed for the configuration of the cylindrical cavity with a radiation window. The frequency characteristics of electromagnetic field are also studied according to the enclosure structure of the cylindrical cavity. To verify the theoretical analysis, computed results are compared to experimental results.

Characteristics of the Electric and Magnetic Field Waveforms Radiated by Lightning Discharges (뇌방전에 의해 방사되는 전계와 자계파형의 특성)

  • 이복희;이경옥
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.7 no.4
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    • pp.300-309
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    • 1996
  • The electric and magnetic fields radiated by lightning discharges are significantly changeable in amplitude and time, one of the topics concerning electromagnetic compatibility of modern electronic systems is the efficient and economic protection against transient voltages caused by not only by direct but also by nearly lightning strokes. In this paper, in order to obtain the detailed informations about lightning electromagnetic impulse waveforms, the electric and magnetic fields radiated by lightning discharges in the summer of 1995 were measured by a fast electric antenna and a loop-type magnetic field sensor, and their charac- teristics were presented and analyzed. The signals of the electric and magnetic fields were re- corded continuously by a transient digitizer having a resolution of 12 bit and a memory capacity of 5000 point and using a sampling time of 200 ns. The electric and magnetic field waveforms associated with lightning return strokes are significantly different with those of intracloud discharges. The magnetic fields radiated by intracloud lightning discharges have essentially the same waveforms as the electric field when the lightning discharhes are at distance of 50 km or more. Also the main frequency components of the electric and magnetic fields radiated by lightning discharges range from a few kHz to several hundred kHz.

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Analysis of Electromagnetic Fields Radiated from an Aperture on Conducting Plane Covered with a Moving Plasma Layer (운동중인 플라즈마 층으로 덮인 평면 도체성의 개구면에 의한 복사전자계 해석)

  • 김남태;이상설
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.9
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    • pp.715-720
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    • 1991
  • The electromagnetic fields radiated from an aperture on a conducting plance covered with a moving uniaxial plasma layer are analyzed. From wave equations in moving plasma and free space region, their solutions are obtained and radiation fields are determined by applying proper boundary conditions in each region. For a particular case of isotropic plasma layer, our results correspond to well-known results.

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The Electric Fields Characteristics of Partial Discharges in $SF_6$ ($SF_6$ 가스중 부분방전시 전계 특징)

  • 김해준;박경태;박광서;이현동;김충년;이광식
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2001.11a
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    • pp.145-149
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    • 2001
  • The most of faults in gas insulation of power facilities are caused by partial discharge. Therefore we simulated partial discharge and measured the radiated electromagnetic wave emitted from partial discharge in SF$_{6}$ gas by biconical antenna. This paper describes time delay and electric fields pulse characteristics of radiated electromagnetic waves with distance(1[m], 3[m], 5[m]) between antenna and discharge source.e.

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Measurement and Analysis for Electric Fields due to Lightning stepped leaders (뇌방전의 리더진전에 따른 전장파형의 측정과 분석)

  • Lee, B.H.;Jeang, K.H.
    • Proceedings of the KIEE Conference
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    • 1999.07e
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    • pp.2164-2166
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    • 1999
  • This paper is describes the measured electric field waveform radiated by lightning discharge. We have performed measurement and analysis of the electric fields associated with stepped leaders. Electric field measurement system was composed of hemisphere electric field sensor, measurement system of a distance from lightning strokes, automatical recording system, A/D board, personal computer etc. A/D board have high sampling time, high speed data processing, 8bit of resolution. Also, measured characteristics of stepped leaders radiated by were analyzed.

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Analysis of Split Power/Ground Plane Structures for Radiated EMI Reduction (EMI 저감을 위해 분할된 전원/접지 평판 구조에서의 방사성 방출 분석)

  • Lee, Jang-Hoon;Lee, Pil-Soo;Lee, Tae-Heon;Kim, Chang-Gyun;Song, In-Chae;Wee, Jae-Kyung
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.47 no.6
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    • pp.43-50
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    • 2010
  • In this paper, we analyzed radiated emission generated by the split power/ground plane structures in order to reduce EMI in system modules. The magnetic fields and electric fields were simulated and measured on the test boards under various conditions. In order to reduce radiated emission, we have to determine spacing and location of the split ground gap so that input signal frequency does not coincide with the resonance frequency of the split power/ground plane structure and the phase of reflection coefficient is close to $0^{\circ}$ at input signal frequency. Moreover, we found that inserting a stitching capacitor could reduce the radiated emission. Low magnitude of reflection coefficient and the phase close to $0^{\circ}$ are required to reduce radiated emission. It is necessary to properly decide value and location of a stitching capacitor to fulfil those requirements.

Radiated Electromagnetic Field Calculation due to Arc Discharge according to Speed of High Speed Train (고속철도의 속도에 따른 아크에 의한 전자파 방사 계산)

  • Han, In-Su;Lee, Tae-Hyung;Cho, Hong-Shik;Park, Choon-Soo;Kim, Ki-Hwan
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.98-100
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    • 2011
  • High speed Train Systems are the energy supplied system via the pantograph through which the voltage and the current supplied by the catenary wire flow. The arc discharges generate owing to the contact loss between the catenary and the pantograph, and the electromagnetic fields radiate. There are many different phenomena between the static charges and the moving charges in view of the radiated electromagnetic fields. To calculate the electromagnetic filed about the moving charges, it is necessary to adapt Lorentz transformation. Actually, the particle which moves near the speed of light has the relativisitic phenomena. In addition, it is necessary to predict the electromagnetic field because the radiated electromagnetic field takes effect on the near electronic devices and the human beings. In this paper, we model the arc discharge into the dipole antenna model, adapt Lorentz transformation to the case that the electric railway cars move, and calculate the radiated electromagnetic field. By the calculation, we take the basis upon the electromagnetic prediction, and apply to the future research.

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