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Fault indicator

About: Fault indicator is a research topic. Over the lifetime, 10057 publications have been published within this topic receiving 143482 citations. The topic is also known as: FCI & power line fault indicator.


Papers
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Journal ArticleDOI
TL;DR: Because defect behavior is so variable, a fault model always leaves some faults unmodeled, so improved matching algorithms to diagnose complex behaviors even with inaccurate modeling are needed.
Abstract: Because defect behavior is so variable, a fault model always leaves some faults unmodeled. One solution is to use improved matching algorithms to diagnose complex behaviors even with inaccurate modeling.

39 citations

Journal ArticleDOI
30 Sep 2001
TL;DR: In this paper, the authors explore some of the key technical issues surrounding locating signals in high-resistance grounding and ungrounded power systems including signal levels and power requirement, network impedances, and the impact of grounding capacitances and grounding resistances that divert the locating signal.
Abstract: High-resistance grounding and ungrounded power systems have many advantages, including continuous operation after a ground fault. However, locating ground faults is inherently difficult and is a major disadvantage with these systems. The problem stems from the lack of a good signal, such as a large fault current, that points to the fault. Classical search methods use injected locating signals, but they have shortcomings with intermittent faults, multiple 'same-phase' faults, and closed loop/mesh power networks. New location methods attempt to overcome these previous problems by providing signals that can be used during system operation and with microprocessor-based detectors. This paper explores some of the key technical issues surrounding locating signals. Of concern are the signal flows through the power network including the uniqueness of the signal path. Other issues that are addressed, are signal levels and power requirement, network impedances, and the impact of grounding capacitances and grounding resistances that divert the locating signal.

39 citations

Book
04 May 2016
TL;DR: A general methodology is formulated, which will be used for designing sensor fault diagnosis schemes with emphasis on the isolation of multiple sensor faults, and for analyzing the performance of these schemes with respect to the design parameters and system characteristics.
Abstract: Recent advances in information and communication technologies, embedded systems and sensor networks have generated significant research activity in the development of so-called cyber-physical systems. An example of a large network of cyber-physical systems is a smart city with intelligent infrastructures for supporting the environment, energy and water distribution, transportation, telecommunication, health care, home automation, and so on. From a systems point of view, safety, reliability and fault tolerance become key challenges in designing cyber-physical systems. One of the major issues is detecting and correcting faults in the sensors that form a critical part of these networks and systems. For example, if two sensors should provide similar information, how do you know which one is at fault should their readings suddenly greatly differ? Sensor Fault Diagnosis addresses all the issues in sensor fault detection and isolation. It provides a clear tutorial on the challenges and models that can be used to address them. It describes, in detail, the requirements for modeling the systems, designing the architecture, detecting faults, isolating those faults, and presents learning techniques for enhancing performance. This monograph will appeal to all researchers and students working on large sensor networks and systems.

39 citations

Patent
08 Jul 1999
TL;DR: In this article, a fault circuit indicator is provided through a microcomputer-based fault current indicator design for power distribution system, where the microcomputer, and the software embedded therein, replace the functionality of numerous discrete, less reliable electronic components found in prior designs.
Abstract: In a power distribution system, a reliable, accurate, and energy efficient fault circuit indicator is provided through a microcomputer-based fault current indicator design. First, reliability is improved inherently because the microcomputer, and the software embedded therein, replace the functionality of numerous discrete, less reliable electronic components found in prior designs. Second, the embedded software is capable of placing the fault current indicator in one of a number of energy conservation states, without compromising the fault current indicator's ability to provide information relating to the occurrence of a fault. Finally, greater fault current indication accuracy is achieved by detecting excessive line current, followed by a significant drop in line voltage.

39 citations

Proceedings ArticleDOI
21 Jul 2013
TL;DR: In this article, an auxiliary control strategy for downstream fault current interruption in a radial distribution line by means of a dynamic voltage restorer (DVR) is introduced and evaluated, and the results of simulation studies performed in the PSCAD/EMTDC software environment indicate that the proposed control scheme can limit the fault current to less than the nominal load current and restore the point of common coupling voltage within 10 ms.
Abstract: This paper introduces and evaluates an auxiliary control strategy for downstream fault current interruption in a radial distribution line by means of a dynamic voltage restorer (DVR). The proposed controller supplements the voltage-sag compensation control of the DVR. It does not require phase-locked loop and independently controls the magnitude and phase angle of the injected voltage for each phase. Fast least error squares digital filters are used to estimate the magnitude and phase of the measured voltages and effectively reduce the impacts of noise, harmonics, and disturbances on the estimated phasor parameters, and this enables effective fault current interrupting even under arcing fault conditions. The results of the simulation studies performed in the PSCAD/EMTDC software environment indicate that the proposed control scheme: 1) can limit the fault current to less than the nominal load current and restore the point of common coupling voltage within 10 ms; 2) can interrupt the fault current in less than two cycles; 3) limits the dc-link voltage rise and, thus, has no restrictions on the duration of fault current interruption; 4) performs satisfactorily even under arcing fault conditions; and 5) can interrupt the fault current under low dc-link voltage conditions.

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202381
2022215
202127
202061
2019116
2018160