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- 주제어 : Residual current circuit breakers (검색결과 4 건)
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咸承珍(Seung Jin Ham),韓松曄(Song Yop Hahn),高彰燮(Chang Seop Koh) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
The conventional Residual Current Protective Devices (RCD, or earth leakage circuit breaker, ELB) operates depending on the total leakage current which is the vector-sum of resistive and capacitive components of a leakage current. However, the electric disaster such as electric shock or fire is mainly caused by the resistive component. Therefore, in this view point, the RCD is more realistic when it operates by the resistive component of the leakage current. In this paper, a new algorithm for measuring the resistive leakage current from the total leakage current is suggested, and is realized to an actual circuit. According to the suggested algorithm, the resistive component of the leakage current can be found by integrating the total leakage current over only a half cycle of the Line voltage, and it is realized by using analog switches and resettable integrators. It is confirmed through experiments that the suggested algorithm detects, within maximum average error of 6.74%, the resistive leakage current from the total leakage current, and the RCD employing the suggested algorithm brakes the circuit within the regular interrupt time (30msec).
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저압 직류배전 수용가에서의 인체감전 보호를 위한 직류 누전차단기에 관한 연구
박정수,최유림 대한전기학회 2023 전기학회논문지 Vol.72 No.11
Recently, the adoption of new and renewable energy sources such as solar and wind power has increased, and the importance of direct current-based systems to increase energy efficiency is increasing. Accordingly, various studies related to Low Voltage Direct Current(LVDC) distribution are in progress, the industry related to low voltage direct current distribution is developing, and related systems are also in progress. As the industry increases, safety issues such as load protection and electric shock to humans are continuously being raised when implementing low voltage direct current distribution networks. To solve this problem, research on direct residual current detectors (RCDs) and residual current monitors (RCMs) is in progress, and product commercialization is also in progress. However, since RCDs and RCMs are monitoring devices, they cannot be shut off in situations where quick shutoff is required. has. Accordingly, it is necessary to develop a DC earth leakage circuit breaker that can cut off the electric circuit as quickly as possible when a DC leakage occurs. [1-3]. The studies related to direct current electric shock that have been studied so far include research on the effects of electric shock on the human body in direct current in IEC 60479 and research on direct current leakage protection devices in IEC TS 63053 [4, 5]. IEC, an international standards organization, has formed a working group and is conducting research and standardization. However, in implementing actual direct current distribution, research on human electric shock protection within customers is not active and research is still insufficient [6].
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Liu Guojin,Miao Jianhua,Zhao Xingzhou,Wang Ze,Li Xiang 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3
The service life of the residual current circuit breaker with overcurrent protection (RCBO) is long and its life information is diffi cult to obtain. In order to predict its life, a life prediction method based on RCBO performance degradation data is presented in this paper. Firstly, the residual operating current is determined as the degradation evaluation quantity of RCBO. An accelerated degradation test with temperature as the acceleration stress is carried out, and the performance degradation data are obtained. Secondly, the Optimized BP neural network (BPNN) model based on test degradation data is established. The genetic algorithm is used to optimize the BPNN model, which prevents the model from falling into the local optimal solution and improves the prediction accuracy. Thirdly, the pseudo failure life of RCBO under various stresses is predicted by the optimized model. After the test, the relative error between the predicted life and the true value is less than 10%, which meets the requirements of engineering applications. Finally, the service life of RCBO at normal temperature (25 °C) is deduced by the Arrhenius equation.
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전정채,이상익,유재근,Jeon, Jeong-Chay,Lee, Sang-Ick,Yoo, Jae-Geun 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.3
고조파에 의한 누전차단기 동작이 계속적으로 보고되어 왔으나 누전차단기 동작을 설명할 수 있는 자료가 없는 실정이다. 본 논문에서는 누전차단기에 대한 고조파 영향을 규명하기 위해 누전차단기 오동작 현황에 대한 조사 및 누전차단기 원인불명 동작이 자주 발생하는 건물에서 고조파를 측정 및 분석하였다. 또한 왜곡된 파형을 발생시킬 수 있는 고조파 합성장치를 이용하여 누전차단기 동작 특성을 시험하였다. 시험결과 3차 고조파가 기본파에 합성되었을 때 가장 작은 값의 누설전류에 누전 차단기가 동작되었고 기본파에 더해진 고조파 차수가 증가할 수 록 누전차단기 동작전류는 증가하였다. Tripping of residual current protective devices(RCPDs) caused by harmonics has been continuously reported, but no literature is available on the behavior of RCPDs caused by harmonics. This paper, in order to find out the effects of harmonics on RCPDs, investigated the present condition on malfunction of RCPDs and measured harmonics at buildings where nuisance tripping of RCPDs was often occurred. Also, the operational characteristics of RCPDs were tested by the harmonics synthesizer that can generate distorted waveform. Results of experiment detected that there was minimum tripping current of RCPDs when third harmonic added to the fundamental frequency. And it was found that the leakage current to cause tripping of RCPDs increased with more higher order harmonics added to the fundamental frequency.
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