Assessment of the Influence of Losses on the Performance of the Electromagnetic Time Reversal Fault Location Method

Razzaghi, Reza; Lugrin, Gaspard; Rachidi, Farhad; Paolone, Mario

doi:10.1109/tpwrd.2016.2615887

Cited by 47 publications

(23 citation statements)

References 27 publications

(37 reference statements)

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“…Both projection and correlation ambiguity functions share resonance mismatch as the main location mechanism, but correlation comes with a further mechanism, represented by the first fraction in (25), which measures the matching between the decay times τ andτ of the actual and reference line responses. Correlation can be close to one only if both resonances and decay times are matched, as shown in Fig.…”

Section: B Correlationmentioning

confidence: 99%

“…Furthermore, the effects of losses on fault location do not appear to have been formally studied, making it difficult to understand and predict how they affect fault location accuracy. Results of a limited comparative analysis on the effects of propagation losses were discussed in [25], showing that they may indeed lead to erroneous fault locations.…”

Section: Introductionmentioning

confidence: 99%

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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: B Correlationmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In the event of the dc fault, under voltages are observed [111,112] and if voltage drop below the threshold value, then fault is detected as shown in Figure 25. Tripping criterion is given as: (121) This method has a drawback that drop in the voltage is observed on all terminals associated with MT-HVdc link. Therefore, it is not possible to discriminate between the healthy and faulty part of the grid.…”

Section: Non-traveling Wave (Ntw) Methods Based On Under Voltagementioning

confidence: 99%

“…Electromagnetic time reversal (EMTR) method for fault estimation in MT--HVdc offers significant advantages, such as tolerance of low sampling rate, non-requirement of accurate fault arrival time, and superiority compared to transient method for high resistance faults [114][115][116][117][118][119][120][121]. This method is based on reversing the direction of time (t), given as:…”

Section: Non-traveling Wave (Ntw Methods Based On Electromagnetic Timementioning

confidence: 99%

MT–HVdc Systems Fault Classification and Location Methods Based on Traveling and Non-Traveling Waves—A Comprehensive Review

et al. 2019

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Estimation of fault classification and location in a multi-terminal high voltage direct current (MT–HVdc) transmission system is a challenging problem and is considered to be a fundamental maneuver of dc grid protection. This research paper critically reviews traveling and non-travelling wave methods of classification and location of dc faults in multi-terminal HVdc transmission systems. Detailed mathematical analysis of MT–HVdc systems composed of high grounding resistance, cable and overhead line segments, and bipolar coupled transmission network under healthy and faulty conditions, are evaluated. The gravity of this research paper addresses benefits and shortcomings of traveling and non-traveling wave methods and futuristic techniques of fault classification and location.

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“…Therefore, the fault is located in the mirror line and calculated through two or more observers. Based on the time reversal theory, the feasibility of fault location in the field of ultrahigh frequency is proved in reference [21][22][23]. This method is applied to the fault location of AC power networks by only using a single observer.…”

Section: Introductionmentioning

confidence: 99%

A Fault Line Selection Method for DC Distribution Network Using Multiple Observers

Tai

Zheng

et al. 2019

Energies

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This paper proposes a method of fault line selection for a DC distribution network. Firstly, the 1-mode current is calculated using the measured currents of the positive and the negative line. Then, it is time reversed and further decomposed by wavelet technology. Secondly, the lossless mirror line network is established according to the parameters and the topology of the DC distribution network. Thirdly, it is presumed that several virtual current sources are employed at the locations where the corresponding observers are, and the values of these current sources are equal to the processed 1-mode currents. Fourthly, a fault is placed at every point of the lossless mirror line network the RMS value of every assumed fault current is calculated. During this process, the phase coefficient of every lossless mirror line is set to vary along with the length of the line obeying Gaussian distribution. Finally, the line with the peak value of the RMS values of the currents is selected as the fault line. The result of fault line selection is updated using the fewest observers that are set in advance according to the initial result. A DC distribution network is simulated in PSCAD/EMDTC to verify the correctness of the proposed method.

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Assessment of the Influence of Losses on the Performance of the Electromagnetic Time Reversal Fault Location Method

Cited by 47 publications

References 27 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

MT–HVdc Systems Fault Classification and Location Methods Based on Traveling and Non-Traveling Waves—A Comprehensive Review

A Fault Line Selection Method for DC Distribution Network Using Multiple Observers

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