• Title/Summary/Keyword: Ground Fault Detection

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Two-Terminal Numerical Algorithm for Single-Phase Arcing Fault Detection and Fault Location Estimation Based on the Spectral Information

  • Kim, Hyun-Houng;Lee, Chan-Joo;Park, Jong-Bae;Shin, Joong-Rin;Jeong, Sang-Yun
    • Journal of Electrical Engineering and Technology
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    • v.3 no.4
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    • pp.460-467
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    • 2008
  • This paper presents a new numerical algorithm for the fault location estimation and arcing fault detection when a single-phase arcing ground fault occurs on a transmission line. The proposed algorithm derived in the spectrum domain is based on the synchronized voltage and current samples measured from the PMUs(Phasor Measurement Units) installed at both ends of the transmission lines. In this paper, the algorithm uses DFT(Discrete Fourier Transform) for estimation. The algorithm uses a short data window for real-time transmission line protection. Also, from the calculated arc voltage amplitude, a decision can be made whether the fault is permanent or transient. The proposed algorithm is tested through computer simulation to show its effectiveness.

Development Approach of Fault Detection Algorithm for RNSS Monitoring Station (차세대 RNSS 감시국을 위한 고장 검출 알고리즘 개발 방안)

  • Da-nim, Jung;Soo-min Lee;Chan-hee Lee;Eui-ho Kim;Heon-ho Choi
    • Journal of Advanced Navigation Technology
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    • v.28 no.1
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    • pp.1-14
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    • 2024
  • Global navigation satellite system (GNSS) providing position, navigation and timing (PNT) services consist of satellite, ground, and user systems. Monitoring stations, a key element of the ground segment, play a crucial role in continuously collecting satellite navigation signals for service provision and fault detection. These stations detect anomalies such as threats to the signal-in-space (SIS) of satellites, receiver issues, and local threats. They deliver received data and detection results to the master station. This paper introduces the main monitoring algorithms and measurement pre-processing processes for quality assessment and fault detection of received satellite signals in current satellite navigation system monitoring stations. Furthermore, it proposes a strategy for the development of components, architecture, and algorithms for the new regional navigation satellite system (RNSS) monitoring stations.

Development of a Novel Real-Time Monitoring System Algorithm for Fire Prevention (화재예방을 위한 실시간 모니터링 시스템의 알고리즘 개발)

  • Kim, Byeong-Jo;Kim, Jae-Ho
    • Journal of the Korean Society of Safety
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    • v.29 no.5
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    • pp.47-53
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    • 2014
  • Despite the automatic fire alarm system, according to the national fire data system of national emergency management agency, the fires account for 40,932 incidents, 2,184 injuries and about 430 billion won in property losses in 2013. Since the conventional automatic fire alarm system has several weaknesses related to electrical signal such as noise, surge, lighting, etc. Most fires are mainly caused by electrical faults, mechanical problem, chemical, carelessness and natural. The electrical faults such as line to ground fault, line to line fault, electrical leakage and arc are one of the major problems in fire. This paper describes the development of a novel real-time fire monitoring system algorithm including fault detection function which puts the existing optic smoke and heat detectors for fire detection with current and voltage sensors in order to utility fault monitoring using high accuracy DAQ measurement system with LabVIEW program. The fire detection and electrical fault monitoring with a proposed a new detection algorithm are implemented under several test. The fire detection and monitoring system operates according to the proposed algorithm well.

A Fault Section Detection Method for Ungrounded System Based on Phase Angle Comparison of Zero-Sequence Current (비접지 배전계통에서 영상전류 위상 비교에 의한 고장구간 검출 방법)

  • Yang, Xia;Choi, Myeon-Song;Lee, Seung-Jae
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.31-32
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    • 2007
  • In this paper, a fault section detection method is proposed for ungrounded system in the case of a single line-to-ground fault. A conventional method is used for faulted feeder selection according to the angular relationship between zero-sequence currents of the feeders and zero-sequence voltage of the system. Fault section detection is based on the comparison of phase angle of zero-sequence current. Proposed method has been testified in a demo system by Matlab/Simulink simulations. Based on Distribution Automation System(DAS), Feeder Remote Terminal Unit(FRTU) is used to collect those necessary data, at present a demo system is under developing using Manufacturing Message Specification (MMS) in IEC61850 standard.

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A New Scheme to Improve High Impedance Fault Detection Capability Using Directional Over-Current Ground Relay (방향지락과전류계전기를 이용한 고저항지락사고 검출능력의 향상방안)

  • Lee, Seung-Jae;Lim, Jong-Yun;Kim, Il-Dong;Han, Kyoung-Nam
    • Proceedings of the KIEE Conference
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    • 1997.07c
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    • pp.1000-1002
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    • 1997
  • In this paper we proposes a scheme which can improve the detecting capability of the high impedance fault of the conventional distance relaying. It utilizes the directional ground overcurrent relay called HIFR together with the distance relay in order to secure the security and selectivity.

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KOMPSAT-2 Fault and Recovery Management

  • Baek, Myung-Jin;Lee, Na-Young;Keum, Jung-Hoon
    • International Journal of Aeronautical and Space Sciences
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    • v.3 no.2
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    • pp.31-39
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    • 2002
  • In this paper, KOMPSAT-2 on-board fault and ground recovery management design is addressesed in terms of hardware and software components which provide failure detection and spacecraft safing for anomalies which threaten spacecraft survival. It also includes ground real time up-commanding operation to recover the system safely. KOMPSAT-2 spacecraft fault and recovery management is designed such that the subsequent system configuration due to system initialization is initiated and controlled by processors. This paper will show that KOMPSAT-2 has a new design feature of CPU SEU mitigation for the possible upsets in the processor CPUs as a part of on-board fault management design. Recovery management of processor switching has two different ways: gang switching and individual switching. This paper will show that the difficulties of using multiple-processor system can be managed by proper design implementation and flight operation.

A Study on the Improvement of Fault Detection Capability for Fault Indicator using Fuzzy Clustering and Neural Network (퍼지클러스터링 기법과 신경회로망을 이용한 고장표시기의 고장검출 능력 개선에 관한 연구)

  • Hong, Dae-Seung;Yim, Hwa-Young
    • Journal of the Korean Institute of Intelligent Systems
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    • v.17 no.3
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    • pp.374-379
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    • 2007
  • This paper focuses on the improvement of fault detection algorithm in FRTU(feeder remote terminal unit) on the feeder of distribution power system. FRTU is applied to fault detection schemes for phase fault and ground fault. Especially, cold load pickup and inrush restraint functions distinguish the fault current from the normal load current. FRTU shows FI(Fault Indicator) when the fault current is over pickup value or inrush current. STFT(Short Time Fourier Transform) analysis provides the frequency and time Information. FCM(Fuzzy C-Mean clustering) algorithm extracts characteristics of harmonics. The neural network system as a fault detector was trained to distinguish the inruih current from the fault status by a gradient descent method. In this paper, fault detection is improved by using FCM and neural network. The result data were measured in actual 22.9kV distribution power system.

On-board and Ground Autonomous Operation Methods of a Low Earth Orbit Satellite for the Safety Enhancement (저궤도 위성의 안전성 향상을 위한 위성체 및 지상의 자율 운영 방안)

  • Yang, Seung-Eun
    • Journal of Satellite, Information and Communications
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    • v.11 no.3
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    • pp.51-57
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    • 2016
  • Many kinds of telemetry should be monitored to check the state of spacecraft and it leads the time consumption. However, it is very important to define the status of satellite in short time because the contact number and time of low earth orbit satellite is limited. Also, on-board fault management should be prepared for non-contact operation because of the sever space environment. In this paper, on-board and ground autonomous operation method for the safety enhancement is described. Immediate fault detection and response is possible in ground by explicit anomaly detection through satellite event and error information. Also, satellite operation assistant system is proposed for ground autonomy that collect event sequence in accordance with related telemetry and recommend or execute an appropriate action for abnormal state. Critical parameter monitoring method with checking rate, mode and threshold is developed for on-board autonomous fault management. If the value exceeds the limit, pre-defined command sequence is executed.

Development of Fault Detection Algorithm Using S-Transform (S-Transform을 이용한 고장 검출 알고리즘 개발)

  • Lee, Soon-Jeong;Seo, Hun-Chul;Choi, Hae-Sul;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.774-775
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    • 2011
  • Recently, by increasing of devices which are sensitive to power quality, microprocessor and power electronics, the deterioration of power quality is accelerated. Accordingly, various methods for analysis, detection, compensation and countermeasure on power quality are proposed. For this, the study of distinction of various disturbances and fault which is occurred in power system is necessary to prior. Therefore, in this paper, the classification algorithm among steady state and single line to ground fault which is commonly occurred fault is proposed using S-Transform.

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Study of an algorithm for intelligent digital protective relaying (지능형 디지탈 보호계전 알고리즘 연구)

  • 신현익;이성환;강신준;김정한;김상철
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.343-346
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    • 1996
  • A new method for on-line induction motor fault detection is presented in this paper. This system utilizes unsupervised-learning clustering algorithm, the Dignet, proposed by Thomopoulos etc., to learn the spectral characteristics of a good motor operating on-line. After a sufficient training period, the Dignet signals one-phase ground fault, or a potential failure condition when a new cluster is formed and persists for some time. Since a fault condition is found by comparison to a prior condition of the machine, on-line failure prediction is possible with this system without requiring information on the motor of load characteristics.

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