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심매설 접지전극의 전류인가위치에 따른 과도접지임피던스 특성
이복희(Bok-Hee Lee),이봉(Feng Li),이수봉(Su-Bong Lee),이승주(Song-Zhu Lee),전병욱(Byung-Wook Jeon),엄주홍(Ju-Hong Eom),조성철(Sung-Chul Cho),이태형(Tae-Hyung Lee) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
This paper presents the behaviors of transient and conventional grounding impedances of a deep-driven ground rods associated with the injection point of lightning impulse currents. The transient impedance of deep-driven ground rods under lightning impulse currents were higher than the static ground resistance. The transient grounding impedances strongly depend on the injection point and size of grounding electrodes and the rising time of impulse current. Reduction of ground system inductance is an important factor to lightning surge protection.
이복희(Bok-Hee Lee),조성철(Sung-Chul Cho),엄주홍(Ju-Hong Eom),이태형(Tae-Hyung Lee),이수봉(Su-Bong Lee),최종혁(Jong-Hyuk Choi),이봉(Li Feng) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.11월
The soil structure can be easily analyzed from the measured apparent resistivity, but it is difficult to know correctly at a particular depth or at a specific location on earth surface. Some difference among results measured of the same site are occurred. This paper presents an theoretical analysis and measured results as a function of the sensitivity function and measured depth. Also, soil structures and resistivities analyzed with 1-D and 2-D are introduced and discussed.
다른 형상의 접지전극에 접속된 심매설 접지전극의 실효임펄스임피던스
이복희(Bok-Hee Lee),장근철(Keun-Chun Chang),이수봉(Su-Hong Lee) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
This paper deals with the characteristics of potential rise and effective impulse impedance of deep-driven ground rods that are used in high resistivity soil or in confined places such as downtown. Also the effects of the impulse and fault currents on the deep-driven ground rods combined with different type grounding electrodes like as mesh grids and counterpoises are described. The 8/20 ㎲ impulse current and other wave currents with different rise times are injected into the test ground rod and the effective impedances are examined. The most effective way to obtain the fine transient impedance behaviors of deep-driven ground rods is to reduce the inductive component of grounding electrode systems combined with other ground electrodes.