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60Hz ELF 자계에 의한 인체내부 유도 전류밀도 해석
민석원,송기현 대한전기학회 2006 전기학회논문지C Vol.55 No.2(C)
- 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.
765 kV 2회선 송전선 활선 작업자 인체내부 유도전류 밀도 해석
민석원,송기현 대한전기학회 2006 전기학회논문지C Vol.55 No.5(C)
- This paper analysed the induced current density inside human body of hot-line worker for 765kV 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 kV 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/m2 when a worker was outside. As one in brain and heart was higher than 10 mA/m2 when a worker was inside, we propose a method for lowering current density.
유전율 및 도전율을 고려한 765kV 송전선하의 전계에 의한 인체내부 유도 전류밀도 해석
민석원,송기현,양광호,주문노 대한전기학회 2004 전기학회논문지A Vol.53 No.8
This paper analysed the induced current density by electric field of human body under the 765 kV transmission line considering permittivity and conductivity. As permittivity of human body is very high as 106 at 60 Hz, special numerical computation technique in Surface Charge Method(SCM) for composite media with extremely different properties is applied to reduce calculation error of induced current density and electric field inside the human body. Calculation results show that the average of the induced current density inside human body is about 3mA/m2, which is less than ICNIRP criterion (10mA/m2).
60Hz ELF 자계에 대한 고 도전율 및 고 투자율 재료의 차폐효과 분석
민석원,송기현,명성호 대한전기학회 2005 전기학회논문지C Vol.54 No.4(C)
Shielding methods on ELF(Extremely Low Frequency) magnetic fields may include the use of induced currents, modification of magnetic field flux patterns using high permeability and/or high conductivity materials, and others. The magnetic shielding properties of enclosures can be utilized to reduce the magnetic field of current carrying conductors. In this paper, to get a more practical understanding of shielding phenomena, we have investigated the magnetic field reduction by means of 3 dimensional numerical analysis and experiments. We found copper could reduce flux density more then permalloy in both cases of box shield and cylindrical shield. Iron under 10μT of 1 phase could reduce flux density about 20% more than silicon steel, but both of them under 50μT has a similar reduction rate of 10%. The 3 phase horizontal model gave the highest reduction rate and the 1mm thickness iron under 10μT of 3 phase lines did lowest.
민석원,송기현 한국조명.전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.4
This paper investigates a lightning multi-phase flashover on extra high voltage transmission line , which has influence on power systems very much, by the use of ATP. Especially we validated an arcing horn model represented by the nonlinear inductance and resistance which is the most important on the simulation for a multi-phase flashover. We also study relationships between lightning parameters and flashover phases in 765[kV] double circuit transmission system. 본 논문에서는 전력계통에 미치는 영향이 매우 큰 초고압 송전선 다상 뇌격섬락 사고에 대하여 과도현상 분석 프로그램인 ATP를 이용하여 검토하였다. 특히 다상섬락현상 모의에 가장 중요한 아킹혼을 비선형 인덕턴스와 저항으로 표현하여 이 모델의 타당성을 검토하였고 765[kV] 2회선 송전계통의 뇌격 파라메터와 섬락상과 관계를 연구하였다.