Simplified parameter-less fault locator using double-end synchronized data for overhead transmission lines

Elkalashy, Nagy I.

doi:10.1002/etep.1736

Cited by 15 publications

(9 citation statements)

References 18 publications

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“…On the other hand, fault location determination methods used for transmission lines may not be easily applicable in distribution systems because of the taps, distributed loads, and fault impedances. 3,4 Several methods were proposed in the literature to estimate the fault distance in distribution systems with either primitive or measurement-based methods. Primitive fault location methods identify the faulted section via either customer calls or clarifying switching status.…”

Section: Discussionmentioning

confidence: 99%

“…They include shortening maintenance time, resulting in quick service restoration. On the other hand, fault location determination methods used for transmission lines may not be easily applicable in distribution systems because of the taps, distributed loads, and fault impedances . Several methods were proposed in the literature to estimate the fault distance in distribution systems with either primitive or measurement‐based methods.…”

Section: Introductionmentioning

confidence: 99%

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Earth fault location determination independent of fault impedance for distribution networks

Elsadd

Elkalashy

Kawady

et al. 2016

Int. Trans. Electr. Energ. Syst.

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Summary This article introduces a new earth fault location algorithm for both single and parallel feeders in distribution networks with single end measurements. The proposed algorithm depends on using the equality between the computed sequence components of the current at the fault point. The algorithm is independent of the dynamic arcing or static fault impedances. Then the faulted network can be decomposed into a prefault network and a pure fault network. The different types of connections of load transformer are considered in the study. This is because of their known influence on the direction of earth fault current in the faulty network. Moreover, the existence of distributed generation is considered during formulating the mathematical core of the proposed algorithm. Hence, the sequence current components at the faulty point can be derived without the need to measure the distributed generation current contribution or its terminal voltage with all varieties of load transformer connection. The proposed algorithm is tested via simulating a real 11 kV cascaded parallel‐radial earthed distribution feeder from the Egyptian distribution network using Matlab. Different test cases are examined to visualize the performance of the proposed algorithm with a variety of fault conditions, including the fault impedance, loading, load transformer connection, and existence of distributed generations. All applied simulation tests ensure the efficacy of the proposed algorithm for estimating the fault distance in distribution systems with considerable distributed generation insertion and considering all possibilities of load transformer connection.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Earth fault location determination independent of fault impedance for distribution networks

Elsadd

Elkalashy

Kawady

et al. 2016

Int. Trans. Electr. Energ. Syst.

Self Cite

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“…However, these parameters may not be known precisely and they can change with different line loading and weather conditions, which may adversely impact the accuracy of the fault location calculations. In recent years, several papers have been published in which methods of eliminating the negative impact of the line parameters on fault location calculations have been investigated [14], [15], [16], [17], [18], [19]. In each of these cases, the authors developed parameter-free fault location algorithms that were found to deliver accurate calculations of the fault distance when tested with computer simulations.…”

Section: Introductionmentioning

confidence: 99%

Methodology for testing a parameter-free fault locator for transmission lines

Popov

Parmar

Rietveld

et al. 2016

Electric Power Systems Research

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This paper presents a comparison between two different approaches to fault location both with and without utilising transmission line parameters. Firstly, an impedance-based parameter-dependent algorithm, derived by using modal transformation theory and Fast Fourier Transforms is presented. The methodology is able to locate the fault whether it is on an overhead line or on an underground power cable. The second algorithm is a parameter-free fault location method that uses time synchronized data. Here, the unknown fault location is determined from voltage and current phasors, synchronously measured at both line terminals. This approach to fault location avoids the requirement for prior knowledge of line parameters, which is advantageous as line parameters are not always known precisely. This paper presents the results of algorithm testing through the use of ATPDraw simulations and MATLAB. The results were validated through laboratory experiments. The results of the line parameter-free model are compared with those from the parameter-dependent model. Both algorithms were tested for single line to ground faults.

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“…It is known that grid faults (symmetrical and asymmetrical) are generated by abnormal grid conditions such as phase‐to‐phase or phase‐to‐ground short circuits. The manifestation of these faults at the point of common coupling (PCC) of the REGS depends on the characteristics of the line and the transformers between the fault location and the PCC .…”

Section: Introductionmentioning

confidence: 99%

Current reference strategy with explicit negative sequence component for voltage equalization contribution during asymmetric fault ride through

Revelo

Silva

2014

Int. Trans. Electr. Energ. Syst.

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SUMMARYThe unbalanced voltage condition represents by far the most typical scenario of distribution power generation systems during faults. In fact, the different current reference generation strategies designed to meet the reactive power requirements of the grid codes during faults are influenced by this fault's characteristics. Nevertheless, in the current references strategies found in literature, there are still issues to be addressed, like clarifying the effect of reactive current injected in the negative sequence, how to best inject reactive power to help equalize the phase voltages while supporting the average grid voltage and how much negative sequence reactive current can or should be injected. This work presents a current reference strategy to achieve, or to contribute to, the equalization of the phase voltages at the point of common coupling through the injection of the reactive power with a proportion between the positive and negative sequence reactive currents determined by the fault characteristics. This strategy is derived from the idealized response of a synchronous machine to asymmetric faults. Simulation and experimental results obtained with the proposed method and others described in literature are presented and compared to provide insight into the advantages and limitations of the negative sequence reactive current injection.

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Simplified parameter-less fault locator using double-end synchronized data for overhead transmission lines

Cited by 15 publications

References 18 publications

Earth fault location determination independent of fault impedance for distribution networks

Earth fault location determination independent of fault impedance for distribution networks

Methodology for testing a parameter-free fault locator for transmission lines

Current reference strategy with explicit negative sequence component for voltage equalization contribution during asymmetric fault ride through

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