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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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Patent
09 May 1994
TL;DR: In this article, the authors propose a power system fault handling mechanism for portable electronic devices having multiple power supplies, which couples all available power supplies to the power load, yet avoids feeding power back from any of the supplies to one another.
Abstract: A power system fault handling mechanism for portable electronic devices having multiple power supplies. A safety-net circuit is triggered when a power fault condition is detected. The safety-net circuit is a diode-based bridging circuit which couples all available power supplies to the power load, yet avoids feeding power back from any of the supplies to one another. This ensures that the load continues to receive power after a fault condition occurs without interruption. A microcontroller may then implement routines to switch to a working power supply so that the device may resume normal operation. The power system fault detection mechanism thus allows for the switching between system power supplies without disrupting a running process.

44 citations

Proceedings ArticleDOI
01 Oct 2014
TL;DR: The wavelet transform is proven to be able to capture the distinctive feature of the fault pattern, specifically fault current rising time and oscillation pattern, which are helpful to form a basis for the tripping decision.
Abstract: HVDC system has become practically mature over the years but it is still met with some protection issues which should be discussed, for example, the circuit breaker (CB) should be selective to not trip if the transient is temporary, such as overcurrent due to load change. This paper addresses the problem with identifying the type of faults in a HVDC system using wavelet transform (WT). The wavelet transform is proven to be able to capture the distinctive feature of the fault pattern, specifically fault current rising time and oscillation pattern, which are helpful to form a basis for the tripping decision. Three phase-to-ground fault and DC fault are of concern in this paper as their effects are the most detrimental to the system. The point-to-point HVDC system is simulated using PSCAD, and the simulation result is subsequently processed in MATLAB to perform the wavelet transform.

44 citations

Proceedings ArticleDOI
17 Jul 2016
TL;DR: In this paper, the application of Short Time Fourier Transform (STFT) to not only detect but also differentiate types of disturbance in HVDC system is investigated, and a parameter is proposed to capture the pattern of the side lobes in frequency domain.
Abstract: The protection of HVDC system is an important topic for stable transmission. When fault happens, DC breaker opens the circuit electronically unlike AC breaker, therefore, its operation is very fast. Besides that, it is also equally important to design a fast fault detection method. This paper investigates the application of Short Time Fourier Transform (STFT) to not only detect but also differentiate types of disturbance. For this application specifically, one needs to compromise frequency resolution in exchange for better time resolution. As a result, we are no longer able to find the frequency components in fault signal. To address that, a parameter is proposed to capture the pattern of the side lobes in frequency domain. It is seen that STFT, with that parameter, can effectively detect the DC fault very fast (<1.5ms), as well as differentiate it from AC fault and load change. A two-terminal Modular Multilevel Converter (MMC) HVDC system is used to simulate fault in PSCAD/EMTDC. The DC current is exported to MATLAB to perform STFT.

44 citations

Journal ArticleDOI
TL;DR: In order to achieve smooth transitions from prefault to postfault, an embeddable fault-tolerant method based on predictive torque control (PTC) is proposed and can make power switch fault easily managed by the controller itself.
Abstract: The nonredundant voltage-source inverter, which exploits the possibility of minimum additional components for reconfiguration and operation, is a promising solution to manage faults in one inverter leg. However, control schemes at prefault and postfault conditions are always designed, separately making it hard for control scheme adaptation from normal to fault tolerant. In order to achieve smooth transitions from prefault to postfault, an embeddable fault-tolerant method based on predictive torque control (PTC) is proposed. A generalized voltage vectors, switching command, and cost function accounting for both healthy and faulty conditions are introduced to carry out a general control scheme. A novel fault-diagnosis method based on probability density analysis of the sampling currents is presented for open-circuit fault isolation under PTC scheme. Seamless likely and rapid transient processes from fault occurrence to postfault operation are achieved. Experimental results have demonstrated that the proposed scheme can make power switch fault easily managed by the controller itself.

44 citations

Journal ArticleDOI
TL;DR: In this paper, the authors proposed a fault location algorithm based on voltage distributions from both terminals having the least difference at the fault point, which is achieved by searching the minimal value of locating criterion function.

44 citations


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