• Title/Summary/Keyword: Over-Current Fault Detection Circuit

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Design of a Current Transducer and Over-Current Fault Detection Circuit for Power Strip Applications (멀티 콘센트용 변류기 및 과전류 검출 회로 설계)

  • Kim, Yong-Jae;Kim, Min-Seok;Park, Gyu-Sang;Kim, Jae-Hong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.8
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    • pp.921-926
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    • 2015
  • For the over-heat protection purpose in power strip devices, over-current detection/protection circuits, such as bimetal, switching circuit, and microprocessor-based relay circuit, have been widely setup in high-end products. Most of these circuits are connected to the power line in parallel and, thus, they are sensitive to the line voltage and current distortion. Moreover, these protection circuits are often costly and, therefore, it is hard to meet the commercial requirements. A low-cost over-current detection circuit with the contactless current transducer is designed and tested in this paper. The detection circuit is galvanically isolated from the power line and, thus, less sensitive to the line voltage distortion. The experimental results show that the proposed circuit accurately operates despite of its simple structure and low-cost electronic parts.

Development of Fault Detection and Classification Method in Distribution Lines (신경회로망을 이용한 배전선 사고 검출 기법의 개발)

  • Kim, K.H.;Choi, J.H.;Chang, S.I.;Kang, Y.C.;Park, J.K.
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1114-1117
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    • 1998
  • Recent applications of neural networks to power system fault diagnosis have provided positive results and have shown advantages in process speed over conventional approaches. This paper describes the application of neural network to fault detection and classification in distribution lines using the fundamental component, 2-5th harmonics index, even and odd harmonics index, and zero phase current. The Electromagnetic Transients Program (EMTP) is used to obtain fault patterns for the training and testing of neural networks. The proposed fault detection and classification method in distribution lines is obtained by analysing the difference among normal, HIF, ground fault, short circuit fault condition.

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A Study on Development of Open-Phase Protector Having Leakage Current Generation and Incapable Operation Prevention at Open-Phase Accident (결상 시 누전전류 발생과 오동작 방지 기능을 갖는 결상보호기 개발에 관한 연구)

  • Kwak, Dong-Kurl
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.1
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    • pp.182-187
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    • 2015
  • In the three-phase power system, when any one-phase or two-phases is open-phase, the unbalanced current flows and the single-phase power supplies to three-phase loads. Specially, motor coil and transformer coil receive over-current. As a result, great damage as well as electrical fire can occur to the power system. In order to improve these problems, this paper proposes that an open-phase detection device is designed by a new algorithm using electric potential difference between the resultant voltage of neutral point and ground, and a control circuit topology of open-phase protector is composed of highly efficient semiconductor devices. It improves response speed and reliability. The control algorithm circuit also operates the cut-off of a conventional residual current protective device (RCD) which flows an enforced leakage current to ground wire at open-phase accident. Furthermore, time delay circuit is added to prevent the incapable operation of open-phase protector about instantaneous open-phase not open-phase fault. The time delay circuit improves more reliability.

A Study on Analysis of Arc Current Waveforms for Detection of Prognostics of Electrical Fires (전기화재 징후 감지를 위한 아크전류 파형분석에 관한 연구)

  • Hwang, Jin-Kwon
    • Fire Science and Engineering
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    • v.23 no.1
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    • pp.7-14
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    • 2009
  • Several electrical loads such as inrush current, normal operation arcing and non-sinusoidal loads have normal current waveforms similar to arc waveforms. To detect arcs in such loads, therefore, it is necessary to analyze difference between current waveforms with or without arcs. In this paper, using apparatuses of arc generation in UL 1699, arcs are generated in these loads and, then, arc current waveforms are investigated in both the time and the frequency domains to find arc characteristics. This investigation shows that arc current signals have shoulders at some zero current points in the time domain and increment of spectrum magnitude in all over frequency domain. It also shows that the arc characteristics at normal operation arcing and non-sinusoidal loads are detected more easily in the frequency domain than in the time domain. This investigated arc characteristics are expected to be utilized as the basis of development of arc-fault circuit interrupters.