An Online Travelling Wave Fault Location Method for Unearthed-Operated High-Voltage Overhead Line Grids

Benato, Roberto; Sessa, Sebastian Dambone; Poli, Michele; Quaciari, Cristiano; Rinzo, Giovanni

doi:10.1109/tpwrd.2018.2816067

Cited by 59 publications

(16 citation statements)

References 33 publications

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“…Over the tested bandwidth the actual and reference lines will be assumed to present a single resonance at ω p and ω p , respectively, each associated to a decay time τ andτ , as defined in (10). Close resonant frequencies 4 can be found also in caseL = L, as implicit in (10a), a potential cause of ambiguity discussed in Sec.…”

Section: A Projectionmentioning

confidence: 99%

Impact of Propagation Losses on Fault Location Accuracy in Full Transient-Based Methods

Cozza

He²

2021

IEEE Trans. Power Delivery

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This paper studies how propagation and termination losses affect full transient-based fault location techniques. Their accuracy is discussed in terms of both location uncertainty, caused by a limited spatial resolution, and systematic errors, caused by a bias in the fault-location metrics. This last case is proven to be by far likelier when propagation losses are higher than the dissipation in line termination loads. Two different location metrics are studied, namely correlation and normalized projection, as found in the literature, with correlation proven to be unbiased, since it benefits from two location mechanisms, namely frequency and time-decay matching of a line resonances, as opposed to projection, which only relies on the former mechanism. A numerical analysis of realistic lossy overhead lines confirms theoretical predictions about biased fault location and loss of spatial resolution and the role played by the frequency content of transient data. When applied to the modal analysis of a three-phase transmission line, these results help explaining why faults are located with widely variable accuracy depending on their distance and the bandwidth of the recorded transient, confirming that wide-band transient sampling does not necessarily results in the best location accuracy.

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Section: A Projectionmentioning

confidence: 99%

Impact of Propagation Losses on Fault Location Accuracy in Full Transient-Based Methods

Cozza

He²

2021

IEEE Trans. Power Delivery

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“…Protection systems where all three phases are monitored at the same time often filter out the contribution from the ground mode, since it typically presents higher propagation losses. These may reduce the location accuracy for distant faults, while also introducing a dispersive propagation due to their lower propagation speed [28], [40]. The ground mode can be removed by using Clarke transform, combining the three transients…”

Section: A Single-phase-to-ground Faultmentioning

confidence: 99%

Surge Compression for Improved Fault Location Accuracy in Full Transient-Based Methods

Cozza

2021

IEEE Sensors J.

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This paper proves that the accuracy of singleended fault location techniques based on the correlation of fault transients in power lines can be significantly improved by inversefiltering transients first. The reason for this improved accuracy is found in the reduction of the duration of the fault surge signal, thus increasing the sensitivity of fault-location metrics to the fault position. Reported results show that by using the proposed filtering strategy, faster sampling rates systematically and significantly improve the location accuracy, as opposed to the case when no filter is applied, for which virtually no improvement is observed. Because of its higher spatial selectivity, the proposed fault-location technique required the development of a new synchronization method, which ensures a precise transient synchronization without the need for high-speed sampling. It is concluded that by jointly using the proposed transient filtering and synchronization solutions, correlation-based fault location can be significantly improved even when using sampling rates as low as 100 kHz. Extensive numerical simulations for a threephase transmission line confirm an improvement exceeding one order of magnitude in the fault location accuracy, for both lowand high-impedance faults.

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“…Fault location has been extensively studied, and different methods have been proposed, which can be classified into four main categories according to [19]. One of the main categories is the measurement based methods, which can be classified into three important groups: (1) power frequency signals [1,5,6,[20][21][22], (2) high frequency signals [7][8][9]23,24], and (3) artificial intelligence [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

High Impedance Fault Detection and Location in Combined Overhead Line and Underground Cable Distribution Networks Equipped with Data Loggers

et al. 2020

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Power distribution networks are vulnerable to different faults, which compromise the grid performance and need to be managed effectively. Automatic and accurate fault detection and location are key components of effective fault management. This paper proposes a new framework for fault detection and location for smart distribution networks that are equipped with data loggers. The framework supports networks with mixed overhead lines and underground cables. The proposed framework consists of area detection, faulty section identification, and high impedance fault location. Firstly, the faulty zone and section are detected based on the operation of over-current relays and digital fault recorders. Then, by comparing the recorded traveling times at both ends of lines, which are related to the protection zone, the faulty line is identified. In the last step, the location of the fault is estimated based on discrete wavelet transform. The proposed method is tested on a 20 kV 13 node network, which is composed of overhead lines and underground cables. The method is tested in both balanced and unbalanced configurations. The obtained results confirm the advantages of the proposed method compared with the current state-of-the art.

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An Online Travelling Wave Fault Location Method for Unearthed-Operated High-Voltage Overhead Line Grids

Cited by 59 publications

References 33 publications

Impact of Propagation Losses on Fault Location Accuracy in Full Transient-Based Methods

Impact of Propagation Losses on Fault Location Accuracy in Full Transient-Based Methods

Surge Compression for Improved Fault Location Accuracy in Full Transient-Based Methods

High Impedance Fault Detection and Location in Combined Overhead Line and Underground Cable Distribution Networks Equipped with Data Loggers

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