Topic
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 published on a yearly basis
Papers
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TL;DR: In this paper, 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.
47 citations
TL;DR: In this paper, a combined Discrete Wavelet Transform (DWT) and Support Vector Machine (SVM) based directional relaying and fault classification scheme including inter-circuit faults, cross-country faults and high resistance faults is presented.
47 citations
Patent•
19 Oct 2001
TL;DR: In this paper, the authors proposed an automatic fault diagnostic procedure for machines, such as steam, gas and hydro-turbines, generators, pumps, electrical motors, etc.
Abstract: The invention relates to an automatic fault diagnostic procedure for machines, such as steam, gas and hydro-turbines, generators, pumps, electrical motors, etc. For each of a plurality of components, for each of a number of possible faults, a total fault symptom strength value is calculated from measured data. If the value is above a predetermined value, the fault symptom strength is plotted and fitted to a trend line to determine an estimate of when the fault symptom strength will exceed a predetermined value. Output messages are then selected based on the fit.
46 citations
01 Jan 2011
TL;DR: In this article, a new inverse type relay is presented to protect a distribution network, which may have several DG connections, based on the measured admittance of the protected line, which is capable of detecting faults under changing fault current levels.
Abstract: Protection of a distribution network in the presence of distributed generators (DGs) using overcurrent relays is a challenging task due to the changes in fault current levels and reverse power flow. Specifically, in the presence of current limited converter interfaced DGs, overcurrent relays may fail to isolate the faulted section either in grid connected or islanded mode of operation. In this paper, a new inverse type relay is presented to protect a distribution network, which may have several DG connections. The new relay characteristic is designed based on the measured admittance of the protected line. The relay is capable of detecting faults under changing fault current levels. The relay performance is evaluated using PSCAD simulation and laboratory experiments.
46 citations
01 Mar 1999
TL;DR: In this paper, an accurate fault location algorithm for a single phase-to-earth fault on a two-parallel transmission line is presented, in which the source impedance of the remote end is not involved.
Abstract: An accurate algorithm for fault location of a single phase-to-earth fault on a two-parallel transmission line is presented. The faulted phase circuit and the zero-sequence circuit of the two-parallel line are used as a fault location model, in which the source impedance of the remote end is not involved. The algorithm effectively eliminates the effect of load flow and fault resistance on the accuracy of fault location. It embodies an accurate fault location by measuring only local data and is used in a procedure that provides the automatic determination of faulted types and phases, rather than requiring an engineer to specify them. Simulation results have demonstrated the validity of the algorithm under the condition of a phase-to-earth fault.
46 citations