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60Hz ELF 자계에 의한 인체내부 유도 전류밀도 해석
민석원,송기현,Min Suk-Won,Song Ki-Hyun 대한전기학회 2006 전기학회논문지C Vol.55 No.2
This paper analysed the characteristics of current density induced inside human body by 60 Hz extremely low frequency magnetic fields according to varying conductivities of human model. Human model was composed of several organs and other parts, whose shapes were expressed by spheroids or cylinders. Organs such as the brain, heart, lungs, liver and intestines were taken into account. Applying the boundary element method to the human model, we estimated effects on the induced current distribution due to differences of the organ conductivity and shape. We find organ conductivity influences most and a cross section area and a position of organ also gives effects.
60㎐ ELF 자계에 의한 인체내부 유도 전류밀도 해석
閔錫源(Suk-Won Min),宋棋鉉(Ki-Hyun Song) 대한전기학회 2006 전기학회논문지C Vol.55 No.2
This paper analysed the characteristics of current density induced inside human body by 60 ㎐ extremely low frequency magnetic fields according to varying conductivities of human model. Human model was composed of several organs and other parts, whose shapes were expressed by spheroids or cylinders. Organs such as the brain, heart, lungs, liver and intestines were taken into account. Applying the boundary element method to the human model, we estimated effects on the induced current distribution due to differences of the organ conductivity and shape. We find organ conductivity influences most and a cross section area and a position of organ also gives effects.
민석원(Suk Won Min),김민호(Min Ho Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
There are concern on possible health effects from exposure to electric and magnetic fields. One reflection of this concern is the considerable controversy, delay, and cost increases involved in the construction of utility lines and facilities. To meet such challenges, in this paper we investigated magnetic fields reduction techniqies such as general compaction, in-span compaction, cruciform, vertical, 3way splits phase, and 4way splits phase. As results, we found 1 spacer in-span compaction was appropriate in Korea in view of effectiveness and economy.
765 ㎸ 2회선 송전선 활선 작업자 인체내부 유도전류 밀도 해석
閔錫源(Suk-Won Min),宋棋鉉(Ki-Hyun Song) 대한전기학회 2006 전기학회논문지C Vol.55 No.5
This paper analysed the induced current density inside human body of hot-line worker for 765㎸ double circuit transmission line according to locations of human body. Human model was composed of several organs and other parts, whose shapes were expressed by spheroids or cylinders. Organs such as the brain, heart, lungs, liver and intestines were taken into account. Applying the 3 dimensional boundary element method, we calculated induced current density in case a worker was located inside and outside a lowest phase of 765 ㎸ transmission line in which a 60% current of maximum load flowed. As results of study, we found a maximum induced current density in all organs was less than 10 mA/㎡ when a worker was outside. As one in brain and heart was higher than 10 mA/㎡ when a worker was inside, we propose a method for lowering current density.
교류 아크용접기를 사용하는 작업자의 이중 차폐복 자계저감 특성검토
민석원(Suk Won Min),박준형(Jun Hyeong Park),이승호(Seung Ho Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
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 in case he weared a multi-layer shielding cloth. We know these were lowest when high permeability materials such as silicon and permalloy were applied to the interior of a suit and high conductivity materials such as copper were to the exterior.
민석원(Suk-Won Min) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.10
극저주파 자계 노출과 전기 직업인의 건강영향에 대해서는 아직도 불안감이 있다. 국제비전리방사선방호위원회에서는 1998년과 2010년에 인체 보호기준을 제안하였다. 2010년 기준의 주된 개정 사항은 건강영향을 평가하는 기본 억제 물리량을 유도 전류밀도(1998년 기준)에서 인체 내부 유도전계로 바꾼 것이다. 이를 바탕으로 유럽연합에서는 직업인 전자계 노출 관련 건강과 안전 최소 기준 법안을 2013년 6월 발표하였다. 본 논문에서는 우리나라 변전소 근무자가 노출되는 자계 환경을 변전소 종류, 전압, 설비 별로 조사하였다. 또한 자계 노출 저감 대책을 수립하기 위해 중성점 접지 리액터를 예로 철, 규소강의 자성재의 특성을 인체 유도전계 관점에서 경계 요소법을 적용하여 검토하였다. 조사결과 154 kV, 345 kV 모두 옥내 GIS가 옥외 철구형보다 밀집된 공간에 전력 설비를 배치하여 높은 자계값을 보였다. 지하 전력구의 경우는 순찰로가 케이블에 근접하여 가장 높은 자계값을 보였다. 중성점 접지 리액터 자계 차폐재로는 철은 인체 내부기관에 유도되는 전계를 감소시킬 수 있으나 규소강은 유도전계가 매우 커지는 현상을 보였다. There are ongoing concerns on the possible negative health effects of the exposure to ELF (Extra Low Frequency) magnetic fields of human beings. In this regard, the International Commission on Non-Ionizing Radiation Protection proposed human protection guidelines in the years 1998 and 2010. One of the main revisions of the 2010 guideline is to change the basic restriction quantity that evaluates health effects from the induced current density (a value from 1998) as compared to the induced electric field inside the human body. In this paper, the magnetic field environment to which the Korean substation workers are exposed was investigated by substation type, voltage, and equipment. In addition, to establish measures to reduce exposure to magnetic fields, the properties of magnetic materials iron and silicon steel were reviewed by applying the boundary element method from the point of view of the induced electric field. As a result of the investigation, both 154 kV and 345 kV indoor GIS showed high magnetic field values when arranging power facilities in a space where indoor GIS was denser than outdoor steel type. In the case of the underground tunnel, the patrol route was close to the cable and showed the highest magnetic field value. As shielding material of neutral ground reactor, iron can reduce the electric field induced in the internal organs of the human body, but silicon steel shows a phenomenon that the induced electric field becomes very large.