• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.439-441
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• 2009

Recently, load circuits and components of customer are various. Therefore failures of ELB(Earth Leakage Breaker) and MCCB(Molded case circuit breakers) are more frequent. Lite time of MCCB even if there is same units differ from environment, condition of operation. FEMCA is a efficiency method of system operation or maintenance for system reliability. We study on FMECA procedures and method. In this paper, we focused on FMECA application to MCCB life time test.

• 한국산학기술학회논문지
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• 제9권1호
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• pp.53-58
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• 2008

본 논문에서는 복합고조파 전류에 의한 배선용차단기의 동작특성에 대해 분석하였다. 동작장치의 종류동작 원리에 의해 4가지로 구분되는 배선용차단기는 정격전류의 200[%]의 시험전류로 시험하였다. 실험결과 복합고조파에 의한 오동작은 발생하지 않았으나, 완전전자식의 경우 복합고조파 함유량이 증가함에 따라 시간지연특성이 크게 나타났다. 따라서 복합고조파 함유량이 높은 곳에서는 완전전자식 배선용차단기의 사용을 피하는 것이 좋을 것으로 추정된다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 연구회
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• pp.51-54
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• 2001

This Paper is described basic principles of arc quenching in Molded Case Circuit Breaker. We analyzed magnetic blowout forces acting on the arc in contact system when circuit breakers interrupt fault currents in different three models by 3-D FEM(Finite Element Method). The interrupting time simulated is compared with that of short circuit tests. The results of this study derive valid of the simulation method and present the techniques to improve arc quenching performance.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 전력전자학술대회 논문집
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• pp.546-547
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• 2013

This paper proposes an arc fault circuit interrupter (AFCI) using the distorted voltage wave in electric arc faults. It perceives a voltage instantaneously at the time of voltage drop. and occurrence. It is an AFCI of the new concept which operates with high reliability. The primary reason of electric fire is arc and spark. It prevents an electric fire or an electric leakage accident with quick responsiveness. Earth Leakage Circuit Breaker(ELB), Molded_case Circuit Breaker (MCCB) or Residual Current Protective Device(RCD) can not cut off electric arc or spark to be a major factor of electrical fire. This theory will be able to intercept an arc or a spark. which occurrence with periodic. Consequently It raises a reliability and validates a practicality of RCD.

• 한국화재소방학회논문지
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• 제17권2호
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• pp.1-5
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• 2003

현재 고감도의 누전차단기(RCD)와 배선용차단기(WCCB)및 퓨즈(Fuse)설치를 통하여 누전·단락사고와 과전류 발생시 차단기능을 부여함으로써, 전기화재의 발생을 억제하고 있으나, 매우 미흡한 실정이다. 특히 소손사고와 접속·접촉불량사고 및 순간단락사고 발생시는 구조적으로 차단이 불가능할 것으로 사료되며, 이에 대한 연구가 필요하다. 따라서 본 논문에서는 상기의 상황에 기초해서 가장 일반적으로 사용되고 있는 열동형 누전차단기(단락보호, 과부하 겸용)의 동작원리와 시험항목 및 기준분석을 통하여 문제점을 제시하고자 한다. 또한 저압 배선선로의 소손사고와 접속·접촉불량사고 및 순간단락사고 발생시 전등(R)부하 및 전동기(R-L)부하에 따른 누전차단기의 동작특성을 실제 실험을 통하여 검토하고자 한다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.221-221
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• 2009

This paper is focused on understanding the interrupting capability, more specifically of the fix contact, based on the shape of the contact system in the current MCCB. The magnetic driving force was calculated by using the flux densities induced by the arc current, which are obtained by three-dimensional finite element method. There is a need to assure that the optimum design required to analyze the electromagnetic forces of the contact system generated by current and the flux density be present. This is paper present our computational analysis on contact system in MCCB.

• 전기학회논문지
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• 제62권6호
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• pp.876-880
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• 2013

The major causes of electrical fire are classified to short circuit fault, overload fault, electric leakage and electric contact failure. The principal factor of the fire is electric arc or spark accompanied with such electric faults. Earth Leakage Circuit Breaker (ELB) and Molded_case Circuit Breaker (MCCB), that is, Residual Current Protective Devices (RCDs) used on low voltage distribution lines cut off earth leakage and overload, but the RCD can not cut off electric arc or spark to be a major factor of electrical fire. As the RCDs which are applied in low voltage distribution panel are prescribed to rated breaking time about 30[ms] (KS C 4613), the RCDs can't perceive to the periodic electric arc or spark of more short wavelength level. To improve such problems, this paper studies on an arc fault circuit interrupter (AFCI) using the distorted voltage wave in electric arc faults. The proposed voltage sensing type AFCI is an electrical fire prevention apparatus of new conception that operates a circuit breaker with sensing the instantaneous voltage drop of line voltage at electrical faults occurrence. The proposed AFCI is composed of control circuit topology using some semiconductor switching devices. Some experimental tests of the proposed AFCI confirm practicality and the validity of the analytical results.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.101-101
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• 2010

Power distribution system requires the transformer with higher capacity than ever, but this ever, but this may be the cause of the increasing of short circuit current in contrast to conventional one when short-circuit accident is occurred. Therefore molded case circuit breaker improved in aspects of interrupting capacity of short circuit current in this system is needed. The arrangement and quality of the material of grids in arc quenching room are also designed optimally by the analysis of arc driving forces.

• 전기학회논문지
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• 제61권12호
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• pp.1953-1958
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• 2012

The major causes of electrical fire are classified to short circuit fault, overload fault, electric leakage and electric contact failure. The occurrence factor of the fire is electric arc or spark accompanied with such electric faults, specially short circuit faults. Earth Leakage Circuit Breaker (ELB) and Molded_case Circuit Breaker (MCCB), that is, Residual Current Protective Devices (RCDs) used on low voltage distribution lines cut off earth leakage and overload, but the RCD can not cut off electric arc or spark to be a major factor of electrical fire. As the RCDs which are applied in low voltage distribution panel are prescribed to rated breaking time about 30ms(KS C 4613), the RCDs can't perceive to the periodic electric arc or spark of more short wavelength level. To improve such problem, this paper proposes a prevention apparatus using the line voltage drop of neutral wire and some semiconductor switching devices. Some experimental tests of the proposed apparatus confirm the validity of the analytical results.

• 에너지공학
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• 제13권1호
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• pp.12-19
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• 2004

배선용 차단기(MCCB)는 과부하 및 단로 등의 이상 상태시 전류를 차단하는 기구로, 오작동시에는 중대사고를 초래한다. MCCB를 개발하는데 있어서 고전류 및 향상된 방열성능은 소형화 및 성능향상을 필요로 하는 기기의 안전기능 및 신뢰성을 확보하는데 그 중요성이 더해 가고 있다. 또한, MCCB를 설계하는데 있어 온도상승 요인을 고려하는 것은 매우 중요하다. 온도상승의 주된 원인은 기기 내부저항, 특히 접속부와 접촉부로부터의 저항을 들 수 있는데, 전류, 시간, 접촉면의 형상, 그리고 사용전압에 의하여 영향을 받는다 본 연구에서는 MCCB 내부 온도분포를 예측하기 위하여 상용코드ICEPAK을 이용하여 수치해석을 수행하였다. 해석결과의 타당성을 검증하기 위하여 동일 모델을 사용한 실험결과와 비교하였는데, 일치된 결과를 얻을 수 있었다.