Norm Criteria in the Electromagnetic Time Reversal Technique for Fault Location in Transmission Lines

He, Shao-Yin; Wang, Zhaoyang; Rachidi, Farhad; Liu, Buying; Li, Qi; Kong, Xu

doi:10.1109/temc.2018.2806892

Cited by 33 publications

(23 citation statements)

References 32 publications

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“…The fact that it occurs at t = 0 is intrinsic to the very definition of TR: this is the instant that provides the maximum coherence, with time and spatial focusing, resulting in the highest peak amplitude possible. It can therefore be expected that EMTR norms measuring peak amplitude should better perform than those based on energy: this improvement was indeed confirmed in [8].…”

Section: Emtr As a Correlation Estimatormentioning

confidence: 67%

“…These results confirm the practical interest of mitigating the effects of V f (ν) in EMTR metrics, in order to benefit from the whole available bandwidth. Previous implementations of EMTR were based on a time-domain description [5], [8], thus even more strongly sensitive to the fault spectrum V f (ν), since in this case no attempt was made in reducing the dominance of low-frequency contributions.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…where v g (t) was originally the energy of v g (t), eventually evaluated only over a finite time interval [9]. More recent work [8] showed that other norms perform better, by monitoring, e.g., the peak-amplitude of voltage or current at the test fault locations. In the rest of the paper, the energy norm will be referred to as L 2 2 , i.e., the L 2 norm squared, and the peak amplitude as L ∞ , for the sake of simplicity.…”

Section: A Brief Summary Of Emtrmentioning

confidence: 99%

“…The above definition should not be confused with a posteriori normalization of the kind currently used in current EMTR implementations [5], [8]. Indeed, in (11) the normalization is meant to remove scaling factors that are intrinsically position dependent.…”

Section: Emtr As a Correlation Estimatormentioning

confidence: 99%

“…maximum focused energy or peak amplitude [8]. While EMTR has been presented as an effective fault-location method [9]- [11], none of the results available in the literature has so far provided clear design criteria and necessary conditions to ensure accurate fault location.…”

mentioning

confidence: 99%

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Electromagnetic Time Reversal as a Correlation Estimator: Improved Metrics and Design Criteria for Fault Location in Power Grids

He¹,

Cozza²

2020

IEEE Trans. Electromagn. Compat.

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Recently published papers have proven the effectiveness of Electromagnetic time reversal (EMTR) in locating the position of faults such as phase-to-ground shunt connections in power grids. EMTR directly transposes the idea of focusing energy back to its source introduced in original time-reversal methods. The current interpretation of EMTR, based on metrics measuring energy or peak-amplitude of focusing, is shown to suffer from ambiguities that increase the risk of inaccurate fault location. After pointing out under what conditions time-reversal focusing occurs, an original frequency-domain reformulation of EMTR is introduced, showing that EMTR should more accurately be interpreted as a correlation estimator. New metrics based on this observation are introduced, taking into account the inhomogeneous transmission of electrical energy throughout complex networks, enabling a direct quantitative evaluation of the likelihood of locating a fault. Extensive numerical simulations confirm that the proposed formulation systematically improves the reliability of EMTR location estimates when faults occur in power grids of realistic complexity, highlighting the accrued risk that comes with the use of metrics that measure the scale of time-reversal focusing rather than its quality. Index Terms-Fault location, power grids, time reversal. I. INTRODUCTION T HE proper operation of power grids can be severely disrupted by events such as shunt faults where two or more conductors, subject to different potentials, become electrically connected through a low-impedance path, e.g., because of electrical arcs or phase-to-ground faults. The occurrence of such shunt faults is followed by transient signals that can be detected by a monitoring station, or probe, and subsequently used in order to estimate the fault position. A large number of methods has been introduced in the last decades for fault location in power grids, among which those based on travelling waves are of interested in the context of this paper [1]-[4]. A recent proposal for fault location is Electromagnetic Time Reversal (EMTR) [5], which is inspired by the idea of timereversal (TR) focusing [6], [7]. Its main appeal is its ability to locate faults from the transient signals they generate, as measured from a single probe. Its performance has been shown to depend on what kind of metrics are used, e.g., by monitoring S. He and Y. Xie are with

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Section: Emtr As a Correlation Estimatormentioning

confidence: 67%

Section: Simulation Resultsmentioning

confidence: 99%

Section: A Brief Summary Of Emtrmentioning

confidence: 99%

Section: Emtr As a Correlation Estimatormentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Electromagnetic Time Reversal as a Correlation Estimator: Improved Metrics and Design Criteria for Fault Location in Power Grids

He¹,

Cozza²

2020

IEEE Trans. Electromagn. Compat.

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Time reversal applied to fault location in power networks: Pilot test results and analyses

Wang

Razzaghi

Paolone

et al. 2020

International Journal of Electrical Power & Energy Systems

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Analytical expression for estimation of the fault location in cable line

Liu

Wang

2020

IET sci. meas. technol.

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A new method for the fault location in a short cable line is proposed in this study. Based on the transmission line theory and circuit theorems, an analytical expression for estimating the fault location in the cable line is derived. According to the problem of incorrect estimation in the high‐frequency band, the corresponding essential reason is comprehensively explained. By solving this problem, the fault location can be obtained accurately by the proposed method. To validate the proposed method, some experiments with a 50 Ω coaxial cable are implemented and the accuracy of the proposed method is tested. Meanwhile, it has been validated in these experiments that the proposed method is independent of the fault impedance and terminal impedances.

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Norm Criteria in the Electromagnetic Time Reversal Technique for Fault Location in Transmission Lines

Cited by 33 publications

References 32 publications

Electromagnetic Time Reversal as a Correlation Estimator: Improved Metrics and Design Criteria for Fault Location in Power Grids

Electromagnetic Time Reversal as a Correlation Estimator: Improved Metrics and Design Criteria for Fault Location in Power Grids

Time reversal applied to fault location in power networks: Pilot test results and analyses

Analytical expression for estimation of the fault location in cable line

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