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감전에 대한 인체보호용 누전차단기의 전자회로 특성분석을 통한 누전트립 동작시간 개선에 관한 연구
김주철(Ju-Chul Kim),서문수(Moon-Soo Seo),장동석(Dong-Suk Jang),조숙현(Sook-Hyun Cho),한윤탁(Yoon-Tak Han),이상중(Sang-Joong Lee) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.8
This paper analyzed the electronic circuit and investigated the electrical properties to improve the tripping time of domestic ELCB. The operating time of the ELCB showed different values according to the location of voltage waveform and the duration time of leakage current at the instant when the leakage input signal is occurred under rated voltage, and the maximum value of the time measured was up to 26 ms. This was due to the time delay of the IC characteristics used in the electronic circuit which is operated only for the reverse half cycle of the sine wave. The authors developed a prototype circuit breaker with optimized delay element and performed an operation test, through which reduction of the ELCB trip time required for the circuit breaker standard by half was possible. Reduction of operating time of ELCB implies improvement of human body protection against electric shock. It is expected that production of safer ELCB will be possible in the future if more advanced and reliable electronic circuit or IC is developed.
다중권선 ZCT를 이용한 누전차단기의 누전 검출회로 자동진단 연구
윤덕경(Deog-Gyeong Yoon),박상한(Sang-Han Park),장기호(Ki-Ho Jang),김광수(Gwang-Su Kim),서문수(Moon-Soo Seo) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.12
Residual current device(RCD) is a protective device used for the purpose of preventing electric shock accidents, fires caused by short circuits, and damage to equipment caused by arc fault. RCD shall be checked at least once a month using the manual testing. However, if a power shutdown is not possible depending on the load, it is used without periodic check. Therefore, even if the actual leakage current occurs, it will lead to a bigger accident. In this paper, the RCD capable of automatic diagnosis of detecting residual circuits without opened was developed and its performance verified.