• 조명전기설비학회논문지
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• 제18권4호
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• pp.73-82
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• 2004

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[k베 2회선 송전계통의 뇌격 파라메터와 섬락상과 관계를 연구하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 E
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• pp.1586-1588
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• 1998

To use the EMTP, in this paper, a arcing horn is simulated by non-linear resistor and inductor element using TACS, a tower by distributed parameter model, and lines as K. C. Lee model. Changing lightning current characteristics, lightning position, and tower footing resistor value, we analysis multi-phase flashover characteristics in 765 kV transmission line.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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• pp.552-556
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• 2002

The microstructure and electrical characteristics of A~C's ZnO varistors fabricated according to variable sintering condition, which sintering temperature is $1130^{\circ}C$ and speeds of pusher are A: 2mm/min, B: 4mm/min, C: 6mm/min, respectively, were investigated. In the microstructure, A~C's ZnO varist-ors fabricated variable sintering condition was consisted of ZnO grain(ZnO), spinel phase$(Zn_{2.33}Sb_{0.67}O_4)$ Bi-rich $phase(Bi_{2}O_{3})$, 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 is 31.70. Leakage current of A~C's ZnO varistors exhibited below 2mA at rated voltage. Lightning impulse residual voltage of A's ZnO varistor suited standard characteristics, which is 3.85kV at 2.5kA, 4.4kV at 5kA and 5.16kV at 10kA. After multi lightning impulse residual voltage 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 is 0.4% before and after test, and revealed no evidence.