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동력 분산형 고속전철의 전자파 Source 및 Victim에 관한 연구
김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun),구은희(Koo Eun-Hee),구본철(Koo Bon-Chul),유재성(Yoo Jae-Seong) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The high-speed EMU is assembled with distributed EMI sources. Therefore, it contains more electromagnetic sources nearby the distributed victims than the existing concentrated traction system. The electromagnetic sources and victims are identified in this research, and the methodology how to handle EMI/EMS/EMC of the high-speed EMU will be developed for safer operation. It includes measurement method, safety standards of control units and others, and performance evaluations of the firstly developed trial products for the EMU. Also influences by modern telecommunication equipments and effect of PLD(power line disturbance) are to be surveyed in this research.
무선통신서비스 주파수대역에서의 고속전철 시스템의 RFI 내성기준 및 측정방법 연구
김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Wireless telecommunication frequency band becomes wider with the development of modern telecommunication technology, and highly integrated semiconductors are applied more at high speed tain system. RFI susceptibilities of the integrated power semiconductors in high speed train system influence much on the system safety. RFI susceptibility standards and measurement methods in high speed train system at wireless telecommunication frequency band is surveyed in this research.
김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
High speed train system generates much EMI (electromagnetic interference) by arc between the pantograph and the trolley line during the running time. EMI from the tilted EMU train system which is similar to HEMU-400X system for 400 km/h speed and with the distributed engines was measured following EN50121-2, 'Railway applications. - Electromagnetic compatibility (Emission of the whole railway system to the outside world)'. Measured EMI values exceed the limiting values of EN50121-2 in high frequency band (30 ㎒ - 1,000 ㎒), but exceeding frequencies were identified that they are used for mobile communications. Measured EMI values did not exceed the limiting values in other low frequency band between 9 ㎑ and 30 ㎒.
김윤명(Gimm Yoon-Myoung),주영준(Ju Young-Jun),유재성(Yoo Jea-Seong),구본철(Koo Bon-Chul) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
High speed train system consumes much electric power during running, and generate much EMI (electromagnetic interference) by arc between the pantograph and the trolley line. In this paper, EMI was measured following EN50121-2, ‘Railway applications. ? Electromagnetic compatibility. (Emission of the whole railway system to the outside world)’, from the running high-speed railway (KTX) at 300 km/h speed. Measured results exceed the limit values of EN50121-2 in low frequency band (9 ㎑ ~ 150 ㎑), but they did not exceed the limit values in other higher frequency band (150 ㎑ ~ 1 ㎓).
100 kHz 대역의 자계 환경내(內)에서의 페라이트 코어의 계(界) 해석
구본철,유재성,김미자,김윤명,Koo, Bon-Chul,Yoo, Jae-Sung,Kim, Mi-Ja,Gimm, Yoon-Myoung 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.8
최근 근거리에서 수신 모듈에 무선으로 전력을 전달하는 시스템이 많아지고 있다. 무선으로 전력을 공급할 때, 수신 공간의 효율적인 사용을 위하여 ferrite core 주변에 코일을 감아 유도기 전력을 얻는다. 본 논문에서는 100kHz 균일한 단방향의 자계 환경 내에 위치한 페라이트 코어 내부의 자계 분포를 분석한다. 수치 분석을 위 한 시뮬레이터는 유한요소 기법을 적용한 Ansoft사의 Maxwell Tool을 사용하였다. 페라이트 코어의 비투자율의 변화에 따라 집속되는 자속 밀도의 변화를 알아보고, 코일의 권선을 위해 코어의 일부를 잘라내었을 시 총자속의 변화량을 알아보았다. 계산 결과, 100 kHz 자계 환경 내에서 작은 페라이트 코어를 이용하면 코어 내에 약 $3.5{\sim}4$배의 자속 밀도가 증강됨을 확인하였다. 비투자율이 800이면서 반지름의 길이가 4.75 mm인 페라이트 코어의 가장자리에 0.5mm를 도려내었을 때 총 자속은 23% 감소함을 확인하였다. Recently, the number of systems which utilize wireless power transmission to a receiving module in a short distance is increasing. For efficient use of receiving space, coils are wound around the ferrite core to produce electromotive force(emf) in suppling power by wireless transmission. This paper analyzed the magnetic flux density distribution in the ferrite core in magnetic field environment which is uniformly oriented along to a single axis at 125kHz. For numerical analysis, Ansoft Maxwell which is applying the FEM(Finite Element Method) method was used. We studied the variations of the gathered magnetic fluxes to the changes of the relative permeabilities of the ferrite cores. Also we calculated the magnetic flux variation by shaving the ferrite core off for the groove of coil winding. Results showed that using a small ferrite core in magnetic field at 100kHz band can increase the amount of magnetic flux $3{\sim}4 times$ than without the core. The magnetic flux decreased 23% by shaving the core 0.5 mm on the periphery of 4.75 mm radius core with the relative permeability 800.
유호상,왕종욱,서근미,김윤명,Yoo, Ho-Sang,Wang, Jong-Uk,Seo, Geun-Mee,Gimm, Yoon-Myoung 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.5
본 논문에서는 극저주파 자계 세기를 원격으로 측정하기 위한 장치를 설계하고 제작하였다. 자계 측정기는 자계를 등방적으로 측정하기 위하여 3축 자계 센서를 사용하였으며, 측정 대역내 주파수에서 주파수 특성을 보상하기 위하여 등화기를 사용하였다. 3축 자계 센서의 출력 신호를 시간적으로 다중화 시켜, 3축간 균일한 이득 및 주파수 특성을 얻었다. 자계 측정 레벨 범위는 $0.01{\sim}10.0\;uT$이며, 측정 주파수 대역은 $40{\sim}180\;Hz$이 되도록 설계하였다. 제어 시스템은 무선으로 자계 측정기에 접근하며, 최대 접근 거리는 1.0 km이다. 제작된 장치의 측정 레벨 오차는 5% 이내이다. 제작된 장치는 고전압 송전선이 지나는 골프 연습장에 설치되었다. In this paper, we designed and implemented the system for telemetering ELF(Extremely Low Frequency) magnetic field intensity. The magnetic field measurement system used a 3-axis magnetic field sensor to measure the magnetic field with isotropy and the equalizer to compensate the frequency characteristic in band. By multiplexing three output signals of the magnetic field sensor in time domain, we got the uniform gain and frequency characteristic among three axes. This system was designed that the magnetic field measurement level range was $0.01{\sim}10.0\;uT$ and the measurement frequency band was $40{\sim}180\;Hz$. The control system would access to the magnetic field measurement system with RF and the maximum access distance was 1.0 km. We confirmed that the measurement level error of the fabricated system was within 5 %. The fabricated system was installed to a golf practice range where a high voltage power transmission line was crossed.
고속전철 주행시 이선에 따른 전원외란 현상 모델링 및 시뮬레이션 구현
김재문(Kim Jae-Moon),김양수(Kim Yang-Soo),장진영(Chang Chin-Young),김윤명(Gimm Yoon-Myoung) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, an effect on power conversion unit in high-speed railway vehicle by loss of contact between a catenary system and pantograph suppling electrical power to high-speed railway vehicle are investigated. One of the most important needs accompanied by increasing the speed of high-speed railway vehicle is reduced that arc phenomenon by loss of contact brings out EMI. in case of high-speed railway vehicle using electrical power, as comparison with diesel rolling stock, PLD(Power Line Disturbance) such as harmonic, transient voltage and current, EMI, dummy signal injection etc usually occur. To analysis the effect on loss of contact, it is necessary electrical modeling system between the contact line and the pantograph according to the loss of contact. Therefore analytical model of a contact line and a pantograph is constructed to simulate the behaviour of loss of contact. The reliability of the modeling system is verified by simulation implementation on kinds of loss of contact.
서민성(Min-Sung Seo),고영석(Young-Suk Ko),김윤명(Yoon-Myoung Gimm),박시홍(Shihong Park) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Capsule endoscopes generally use primary cells as a power source due to its limited space. However, the primary cells have several limitations such as high cost, limited power and no reuse. To solve these problems, a new wireless energy transmission method is proposed. The proposed approach uses air-gap transformer concepts and LC resonance to transmit energy from transmitted primary side) to capsule endoscopes(secondary side). The ferrite core with 3-axis winding is used to increase energy transfer efficiency regardless of direction and location. The experimental results show that the proposed method stably supplies 3㎽ power to secondary circuit.
이달형(Dal-Hyung Lee),안병곤(Ahn Byung-gon),김재준(Jae-Joon Kim),김윤명(Yoon-Myoung Gimm) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
1979년 Nancy Wertheimer와 Ed Leeper가 수행한 연구결과에서 자기장이 소아백혈병에 의한 사망률을 높일 수 있다는 가능성을 발표한 이후, 인체건강에 유해한지에 대한 많은 궁금증이 증가해 왔다. 이후 일부 검증되지 않은 연구결과를 여과없이 인용 보도함으로써 대다수 국민이 오해하고 막연한 불안감을 갖게 된 측면이 있으며, 전기의 소중함은 누구나 인정하면서 전력시설 인근 주민은 자계에 대해 염려하며 건설반대, 전력설비 이전 등 극저주파전자계의 피해를 우려하고 있는 실정이다. 본 고에서는 국내 송전선로 극저주파자계의 노출현황을 살펴보고, 2007년 6월 세계보건기구(WHO)가 발표한 극저주파전자계와 인체건강의 관계 검토를 마무리한 공식보고서(Fact sheet No.322)를 고찰하고자 한다.