A Travelling Wave-Based Fault Locator for Two- and Three-Terminal Networks

Ibe, A. O.; Cory, B.J.

doi:10.1109/tpwrd.1986.4307961

Cited by 100 publications

(13 citation statements)

References 7 publications

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“…i.e., B T ≫ 1.8 kHz for the three networks studied in this paper. The ratio B T /B c measures the number of degrees 3 defined as the average of the squared impulse responses of a system of freedom, or independent information collected across the bandwidth B T ; these grains of information underlie the most important property of TR, i.e., self averaging [19], [23], [24]. Fig.…”

Section: Reverberation Relaxation Time and Minimummentioning

confidence: 99%

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: Reverberation Relaxation Time and Minimummentioning

confidence: 99%

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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“…However, there are some factors that can cause a needless operation of the distance protection such as the CTs saturate, the resistances of fault arcs, impedance data and calculation error. In order to prevent false tripping in these cases, several algorithms for using in fault detection and fault location have been developed in order to be employed in the protective relays [1][2][3][4]. In the early 1980's, the most effectiveness technique to locate fault location has been proposed based on travelling wave [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…In order to prevent false tripping in these cases, several algorithms for using in fault detection and fault location have been developed in order to be employed in the protective relays [1][2][3][4]. In the early 1980's, the most effectiveness technique to locate fault location has been proposed based on travelling wave [1][2][3]. During the 1990's, the development in the algorithm for locate of the faults on the transmission lines with the wavelet transform was initially proposed by F. H. Magnago et al [4].…”

Section: Introductionmentioning

confidence: 99%

Application of discrete wavelet transforms for fault location on transmission network systems

Pothisarn

Ngaopitakkul

2009

8th International Conference on Advances in Power System Control, Operation and Management (APSCOM 2009)

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This paper proposes a technique to identify locations of fault along the transmission network systems using Discrete Wavelet Transforms (DWT). The maximum coefficients of the positive sequence current obtained from all buses are compared in order to detect the faulty bus on a transmission network and the first peak times obtained from the faulty bus are used as an input data for travelling wave equation. The proposed method gives a satisfactory accuracy, and will be very useful in the development of a modern protection scheme for electrical power transmission network systems.

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“…With sampling frequency from 20kHz [7] to 300kHz [8] these techniques demand special devices both for current and voltage monitoring, their cost prohibiting any transfer to distribution networks.…”

Section: Introductionmentioning

confidence: 99%