• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.691-693
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• 2002

본 연구에서는 전류 영점 직전까지의 대전류 구간에서의 열가스 해석을 수행하여, 그 결과와 과도 회복 전압에 따른 아크 후 전류를 계산하여, 아크 후 전류의 0으로의 수렴 여부를 이용하여 열적 파괴 영역에서의 차단성능을 평가한다 아크 후 전류는 유동해석을 통해 구하여진 극간의 온도분포로부터 계산된 아크 저항과 과도인가회복 전압을 이용하여 계산된다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.495-496
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• 2011

기존에 사용되고 있는 초고압 가스차단기(GCB : gas circuit breaker)는 대부분 퍼퍼형(puffer type) 소호방식의 가스 차단기를 사용하였다. 퍼퍼형 소호방식은 차단동작에 있어서 대단히 큰 조작력이 요구되고 소호부 size가 큰 단점을 가지고 있다. 이러한 문제를 해결하기 위해 아크 자체의 에너지를 아크 소호에 필요한 압력상승을 일으키는 데 이용하는 자력소호방식(self-extingishing type)에 작은 체적의 퍼퍼 실린더를 병용하는 복합소호방식(hybrid extingishing type) 차단부가 개발되어 사용이 확대되고 있다. 본 논문에서는 차단기의 소호방식별 특성을 비교 분석하고 최근 사용이 확대되고 있는 복합소호방식 차단기의 고장사례 분석을 통해 개선대책을 제시하였다.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.161-163
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• 1998

The interruption performance of EHV class gas circuit breakers critically depends on the flow conditions inside interrupter and the external circuit conditions. In case of puffer type gas circuit breakers the flow conditons are significantly influenced by arcing time. In this paper the calculated results of RRRV and pressure rise at current zero with varying arcing time are presented and the effect of arcing time on the thermal interruption performance of EHV class gas circuit breakers is analyzed.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.11
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• pp.519-526
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• 2005

This paper presents computer simulation results for developing new type of SF$_{6}$ Circuit Breaker in terms of cold gas flow after small current interruption. This cold gas flows down a nozzle into the chamber of a circuit breaker. There are many difficult problems in analyzing the gas flow due to complex geometry, moving boundary, shock wave and so on. When predicting the dielectric capability of a gas circuit breaker after interruption, the gas pressure and density distributions due to the cold gas must be considered in addition to the electrical field imposed across the gas. A self-coded computational fluid dynamics (CFD) program is used for the simulation of cold gas flow in order to evaluate the electrical field characteristic across open contacts and transient characteristics of insulations after small current interruption.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.89-91
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• 1999

The performance of circuit interruption of $SF_6$ puffer cylinder type gas circuit breaker(GCB) has been evaluated from the results of electrical insulation strength which is depend on material property, such as $SF_6$ gas density in circuit breaker tank. In order to determine circuit breaker dimension in the safety criteria. electrical field analysis has been done by finite element method. Gas density of concerned area in the circuit breaker has been calculated. In order to predict small current break performance, Electrical field analysis result must be calculated based the results of density from cold flow dynamics. The proposed method has been carried out and evaluated for 362kV class high voltage GIS.