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소결 조건 변화에 따른 직류 피뢰기용 ZnO 바리스터의 미세구조 및 전기적 성질에 관한 연구
김석수,최익순,박태곤,조이곤,박춘현,Kim, Seok-Sou,Choi, Ike-Sun,Park, Tae-Gon,Cho, I-Gon,Park, Choon-Hyun 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.6
The microstructure and electrical characteristics of A ∼ C's ZnO varistors fabricated according to variable sintering condition, which sintering temperature was 1130 $^{\circ}C$ and speeds of pusher were A: 2 mm/min, B: 4 mm/min, C: 6 mm/min, respectively, were investigated. The experimental results obtained from this study were summarized as follows: The sintering density of A ∼C's ZnO varistors sintered at 1130 $^{\circ}C$ were decreased by sintering keep time to shorten, such as A: 9hour, B: 4.5hour and C: 3hour. A's ZnO varistor exhibited good densification nearly 98 % of theory density. In the microstructure, A∼C's ZnO varistors fabricated variable sintering condition was consisted of ZnO grain(ZnO), spinel phase(Z $n_{2.33}$S $b_{0.67}$ $O_4$), Bi-rich phasc(B $i_2$ $O_3$), wholly. Varistor voltage of A∼C's ZnO varistors sintered at 1130 $^{\circ}C$ increased in order A <B <C's ZnO varistors. C's ZnO varistor exhibited good characteristics that nonlinear exponent was 31.70. Leakage current of A ∼ C's ZnO varistors exhibited below 2 ㎃ at rated voltage. Lightning impulse residual voltage of A's ZnO varistor suited standard characteristics, which was 3.85kV at 2.5kA, 4.4 kV at 5kA and 5.16 kV at 10 kA. After continuous lightning impulse current test of A's ZnO varistor exhibited good discharge characteristics which ZnO varistor reveals no evidence of puncture, flashover, cracking in visual examination. After high current impulse test of A's ZnO varistor exhibited good discharge characteristics, which variation rate of residual voltage was 0.4 % before and after test, and revealed no evidence. evidence.
김석수(Seok-Sou Kim),허종철(Jong-Cheol Heo),문인욱(In-Wook Mun),오창수(Chang-Su Oh) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
It has been reported that more than 50% of breakdown in transmission line for 154㎸ and above is due to lightning stroke. The flashover failure due to lightning stroke causes outage, voltage drop and instantaneous outage, Therefore line arrestors have been used in transmission line for protection from lightning stroke. In this paper, we describes electrical characteristics and performance test of line arrestor for transmission line.
폴리머 핀 애자(Polymer Pin Insulator)의 전기적 및 기계적 특성
김석수(Seok-Sou Kim),허종철(Jong-cheol Heo),정세영(Se-Young Jung),박춘현(Choon-Hyun Park) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문에서는 최근 국내에서 개발된 자기재 및 플라스틱핀 애자의 단점을 보완한 실리콘 고무 재질의 하우징으로 구성된 폴리머 핀 애자(Polymer Pin Insulator) ANSI Class 55-3에 대하여 ANSI Std. C29.5(1984)에서 요구되는 전기적 및 기계적 특성을 고찰하였다. 정격전압이 11.5㎸인 폴리머 핀 애자의 건조 및 주수 상용주파섬락전압시험, 뇌충격섬락전압시험, 전파장해전압시험 등의 전기적 특성과 굽힘시험 등의 기계적 특성을 고찰하였으며, 그 결과 ANSI Std. C29.5(1984)의 요구사양에 만족한 실선로에 적용할 수 있는 특성을 나타내었다.
허종철(Jong-Cheol Heo),김위영(We-Young Kim),김석수(Seok-sou Kim),오창수(Chang-Soo Oh),박정후(Chung-Hoo Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
ERA PD measuring system has been using for partial discharge evaluation of power appratus in test laboratories. So, the measurement uncertainty of PD measuring system (ERA), such as PD pulse calibrator rise and fall time, sacle factor(k) and linearity, transfer impedance etc, is very important factor of test result in test laboratory. In this paper, we describe tracebility and uncertainty improvement of PD measuring system in test laboratory based on IEC 60270.