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이복희(B. H. Lee),이봉(B. Lee),강성만(S. M. Kang) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
This paper presents the frequency-dependent characteristics of leakage currents flowing through ZnO surge arrester block. The leakage current-voltage (Ⅰ-Ⅴ) characteristic curves of the commercial ZnO surge arrester blocks were measured. The resistive leakage current was found to increase with increasing frequency in the low conduction region. The capacitance of ZnO block was independent of the magnitude and frequency of the applied voltage. The power losses of ZnO block increase as the frequency of applied voltage increases, because of the dielectric loss related to the frequency of the test voltage.
반구형 축소모델을 이용한 접지전극 주변의 전위상승 분석
이복희(B.H. Lee),백영환(Y.H. Beak),이봉(F. Li),김기복(K.B. Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
This paper describes the ground surface potential profiles near the object to be grounded. The hemisphere water tank was used to simulate the scale model. As a result, the ground surface potential near the ground electrode was considerably raised. In particular the ground surface potential at the just upper part of ground rod was higher than other part. The ground surface potential was lowered with increasing the buried depth of ground rod.
8 / 20㎲ 임펄스전류의 크기와 인가횟수가 ZnO 바리스터의 수명에 미치는 영향
이복희(B. H. Lee),이봉(B. Lee),이수봉(S. B. Lee),강성만(S. M. Kang) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.11월
This paper presents leakage current characteristics as a function of injected number and magnitude of impulse current, when 8/20㎲ lightning impulse current is injected to ZnO varistor. The life of ZnO varistor against 8/20㎲ lightning impulse current was evaluated. The injected number of the test current to breakdown was inversely proportional to the amplitude of impulse current.