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.
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TL;DR: In this paper, a new Active Impedance Estimation (AIE) based protection strategy for DC zonal marine power distribution system is presented. This method uses two triangular current "spikes" injections for system impedance estimation and protection when faults are detected.
Abstract: A new Active Impedance Estimation (AIE) based protection strategy which is suitable for utilization in a DC zonal marine power distribution system is presented. This method uses two triangular current "spikes" injections for system impedance estimation and protection when faults are detected. By comparing the estimated impedance with the pre-calibrated value, the fault location can be predicted and fault can be isolated without requiring communication between two injection units. Using co¬operated double injections and line current measurement (directional fault detection), faults in the system with same impedance and different fault positions can be distinguished, located and isolated. The proposed method is validated using experimental test results derived from a 30kW, 400V, twin bus DC marine power system demonstrator. The experimental tests were applied to both faults during normal operation and faults that occur during system restoration.
47 citations
TL;DR: In this article, a fault location algorithm for double-circuit series compensated lines based on synchronized phasor measurements is presented, which does not utilize the model of the series compensation device, eliminating thus the errors resulting from modeling such devices.
47 citations
TL;DR: In this paper, an innovative two-terminal impedance-based fault location algorithm is proposed, which considers the distributed parameter line model with line shunt capacitances thereby is able to reliably identify and correct erroneous fault point estimations that arise due to atypical operational features of this particular type of transmission line.
47 citations
TL;DR: A new and more realistic delay model is proposed to obtain true fault coverages that extend up to the actual circuit slacks whenever possible and an alternate test application strategy, involving the usage of varying sampling times, is also proposed to further enhance the actual fault coverage obtained under the proposed delay model.
Abstract: This paper addresses the problem of obtaining accurate fault coverages for the gate delay fault model. For a gate delay fault, it is not sufficient to only find a test. One also has to accurately determine the size of the fault detected. We first show that previous methodologies for determining gate delay fault coverages have certain limitations. A method is then investigated to determine all the possible ranges of detected fault sizes, using the traditional fixed sampling time approach. However, with the constraints of a realistic inertial delay model, it is then shown that it might still not be possible to achieve the coverages required to guarantee circuit operation without malfunctions. A new and more realistic delay model is proposed to obtain true fault coverages that extend up to the actual circuit slacks whenever possible. An alternate test application strategy, involving the usage of varying sampling times, is also proposed to further enhance the actual fault coverages obtained under the proposed delay model. Results of experiments performed to evaluate these methods are given.
47 citations
TL;DR: In this paper, the authors consider subsets of faults and design state observers that use information of inputs and outputs only subject to faults in each subset, and then design residuals using the process model and state estimates such that each residual is only sensitive to the corresponding subset of faults.
47 citations