A Fault-Location Method for Application With Current Differential Relays of Three-Terminal Lines

Iżykowski, J.; Rosołowski, E.; Saha, M.M.; Fulczyk, M.; Balcerek, P.

doi:10.1109/tpwrd.2007.905544

Cited by 85 publications

(38 citation statements)

References 10 publications

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“…The algorithms developed for fault location estimation can be categorized into single-end [2]- [5], double-end [6]- [10], multi-end [11]- [14] and wide-area [15]- [19] methods. Single-end methods use voltage and current measurements from one terminal of the line.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Fault Location of Transmission Lines by Wide-Area Voltage Measurements Considering Measurement Errors

Dobakhshari

Ranjbar

2015

IEEE Trans. Smart Grid

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Smart transmission grids are intended to utilize various measurements for enhanced operation. In particular, synchronized phasor measurements have found many applications in this context. This paper presents a linear weighted least-squares (WLS) method for fault location estimation of transmission lines by synchronized voltage measurements. The measurements may be taken from the faulted line terminals or buses far from the faulted line. The circuit equations of the network are used to find the transfer function between the fault location and each voltage measurement. Next, two auxiliary variables are defined to transform the nonlinear fault location estimation problem into a linear WLS problem. A closed-form solution is then obtained for fault location. The use of multiple measurements provides the opportunity of identifying erroneous measurements by a statistical test. The linearity of the problem expedites both estimation and identification procedures. Moreover, the method requires neither to classify the fault type nor to estimate the fault resistance. Furthermore, transmission lines are modeled by distributed parameters so that the method can be applicable to long lines. Electromagnetic transient simulations for 9-bus and 22-bus test systems reveal accurate fault location estimation, regardless of fault type and resistance, as well as successful identification of measurement errors.

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Section: Introductionmentioning

confidence: 99%

A Novel Method for Fault Location of Transmission Lines by Wide-Area Voltage Measurements Considering Measurement Errors

Dobakhshari

Ranjbar

2015

IEEE Trans. Smart Grid

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“…Considering a linear behavior of the grid before and after the fault, the nodal equations for the untransposed three-phase power network prior to the fault can be written in the matrix form as (6) where is the vector of pre-fault bus voltage phasors and is the bus impedance matrix in the normal operating condition. Besides, is the vector of nodal injected currents, and is the number of system buses.…”

Section: B Extension To Meshed Transmission Networkmentioning

confidence: 99%

Locating Faults on Untransposed, Meshed Transmission Networks Using a Limited Number of Synchrophasor Measurements

Azizi

Sanaye‐Pasand

Paolone

2016

IEEE Trans. Power Syst.

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Abstract-The method of symmetrical components is not effective for fault location in the case of untransposed lines, due to potential couplings between the sequence circuits. This paper proposes a non-iterative algorithm in the phase-coordinates for wide-area fault location on untransposed transmission networks. In doing so, first, an improved two-terminal method is suggested to accurately locate faults on untransposed lines. Next, an algorithm is proposed to infer voltage and current phasors at the faulted line ends without direct measurements, by taking advantage of the data provided by phasor measurement units (PMUs). Accordingly, the adverse effect of close instrument transformers transients on the estimation accuracy is minimized. Being highly nonlinear in terms of fault distance and impedance, the fault equations are derived and made linear in this paper by defining six suitable auxiliary variables. The resulting system of equations is solved using the least-squares method to obtain three-phase voltages and currents at the faulted line ends. A main feature of the proposed algorithm is that it only requires a limited number of current and voltage synchrophasors. An additional advantage of the proposed algorithm is that the faulted line is not required to be known a-priori. The proposed algorithm is validated using extensive simulation studies on the New England 39-bus test system, accounting for different fault locations, types and resistances.

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“…Similar to (5), a nonlinear system of equations is given by (16), which has two unknown variables and . The NewtonRaphson method is utilized once more to solve for and by (7)- (9).…”

Section: B Fault Location Utilizing Only Postfault Datamentioning

confidence: 99%

A Wide-Area Scheme for Power System Fault Location Incorporating Bad Data Detection

Dobakhshari

Ranjbar

2015

IEEE Trans. Power Delivery

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Phasor measurements have found many applications in modern power systems. Wide-area fault location utilizing the bus-impedance matrix and available measurements is a recent achievement in the context of smart transmission grid. This paper aims at developing a wide-area fault-location scheme capable of detecting and identifying erroneous measurements. As a result, while multiple available measurements contribute to fault location in order to increase accuracy, the reliability of fault location is not compromised as the proposed scheme detects, identifies, and removes erroneous measurements. The transfer impedances between the fault location and the phasor measurements, which can be remote from the faulted line, are utilized to formulate fault location as a nonlinear fitting problem. Having estimated the fault location and total fault current, we employ statistical hypotheses testing to detect, identify, and remove bad data. In the case of unsynchronized measurements, the fitting problem is modified to include only the magnitude of measurements. The proposed method considers the distributed parameter model of the transmission lines and, therefore, the obtained results are also valid for long transmission lines. Electromagnetic transient simulations for the WSCC 9-bus and a 41-bus subnetwork of the IEEE 118-bus test system reveal successful fault location by synchronized as well as unsynchronized measurements.

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A Fault-Location Method for Application With Current Differential Relays of Three-Terminal Lines

Cited by 85 publications

References 10 publications

A Novel Method for Fault Location of Transmission Lines by Wide-Area Voltage Measurements Considering Measurement Errors

A Novel Method for Fault Location of Transmission Lines by Wide-Area Voltage Measurements Considering Measurement Errors

Locating Faults on Untransposed, Meshed Transmission Networks Using a Limited Number of Synchrophasor Measurements

A Wide-Area Scheme for Power System Fault Location Incorporating Bad Data Detection

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