The Experts below are selected from a list of 93528 Experts worldwide ranked by ideXlab platform
Admane Mehdi - One of the best experts on this subject based on the ideXlab platform.
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Inverse Scattering for Soft Fault Diagnosis in Electric Transmission Lines
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Zhang Qinghua, Sorine Michel, Admane MehdiAbstract:Today's advanced reflectometry methods provide an efficient solution for the diagnosis of electric Transmission line hard faults (open and short circuits), but they are much less efficient for soft faults, in particular, for faults resulting in spatially smooth variations of characteristic impedance. This paper attempts to fill an important gap for the application of the inverse scattering transform to reflectometry-based soft fault diagnosis: it clarifies the relationship between the reflection coefficient measured with reflectometry instruments and the mathematical object of the same name defined in the inverse scattering theory, by reconciling finite length Transmission Lines with the inverse scattering transform defined on the infinite interval. The feasibility of this approach is then demonstrated by numerical simulation of lossless Transmission Lines affected by soft faults, and by the solution of the inverse scattering problem effectively retrieving smoothly varying characteristic impedance profiles from reflection coefficients.
Zhang Qinghua - One of the best experts on this subject based on the ideXlab platform.
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Inverse Scattering for Soft Fault Diagnosis in Electric Transmission Lines
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Zhang Qinghua, Sorine Michel, Admane MehdiAbstract:Today's advanced reflectometry methods provide an efficient solution for the diagnosis of electric Transmission line hard faults (open and short circuits), but they are much less efficient for soft faults, in particular, for faults resulting in spatially smooth variations of characteristic impedance. This paper attempts to fill an important gap for the application of the inverse scattering transform to reflectometry-based soft fault diagnosis: it clarifies the relationship between the reflection coefficient measured with reflectometry instruments and the mathematical object of the same name defined in the inverse scattering theory, by reconciling finite length Transmission Lines with the inverse scattering transform defined on the infinite interval. The feasibility of this approach is then demonstrated by numerical simulation of lossless Transmission Lines affected by soft faults, and by the solution of the inverse scattering problem effectively retrieving smoothly varying characteristic impedance profiles from reflection coefficients.
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An Inverse Scattering Approach to Soft Fault Diagnosis in Lossy Electric Transmission Lines
'Institute of Electrical and Electronics Engineers (IEEE)', 2011Co-Authors: Tang Huaibin, Zhang QinghuaAbstract:International audienceIn this paper, the diagnosis of soft faults in lossy electric Transmission Lines is studied through the inverse scattering approach, extending a recently reported study on lossless Transmission Lines. The considered soft faults are modeled as continuous spatial variations of distributed characteristic parameters of Transmission Lines. The diagnosis of such faults from reflection and Transmission coefficients measured at the ends of a line can be formulated as an inverse problem. The relationship between this inverse problem and the inverse scattering theory has been studied by Jaulent in 1982 through transformations from the telegrapher's equations of Transmission Lines to Zakharov-Shabat equations. The present paper clarifies and completes the computation of the theoretic scattering data required by the inverse scattering transform from the practically measured engineering scattering data. The inverse scattering method is then applied to numerically simulated lossy Transmission Lines to confirm the feasibility of the studied approach to soft fault diagnosis
Eduardo Cesar Senger - One of the best experts on this subject based on the ideXlab platform.
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Transmission Lines distance protection using artificial neural networks
International Journal of Electrical Power & Energy Systems, 2011Co-Authors: Ricardo Caneloi Dos Santos, Eduardo Cesar SengerAbstract:This work presents the development and implementation of an artificial neural network based algorithm for Transmission Lines distance protection. This algorithm was developed to be used in any Transmission line regardless of its configuration or voltage level. The described ANN-based algorithm does not need any topology adaptation or ANN parameters adjustment when applied to different electrical systems. This feature makes this solution unique since all ANN-based solutions presented until now were developed for particular Transmission Lines, which means that those solutions cannot be implemented in commercial relays.
Shao Fangyin - One of the best experts on this subject based on the ideXlab platform.
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phase conductor configuration and power frequency electromagnetic environment of uhv Transmission Lines in china
Power system technology, 2005Co-Authors: Shao FangyinAbstract:The strategy and measures for solving the power frequency electromagnetic environment problems in developing their UHV Transmission Lines in former USSR, Japan and the US are briefly introduced and analyzed. Based on the construction and operation experiences gained from 500kV Transmission Lines in China a new phase conductor configuration scheme (compact line with verse triangle configuration of phase conductors) is proposed. Distributions of power frequency electric field and magnetic field for the above mentioned three types of UHV Transmission Lines abroad and that of the proposed scheme to be developed are calculated under the same control condition. The obtained results should be helpful in choosing and determining the phase conductor configuration and the type of tower of the first UHV Lines in China.
Sorine Michel - One of the best experts on this subject based on the ideXlab platform.
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Inverse Scattering for Soft Fault Diagnosis in Electric Transmission Lines
IEEE Transactions on Antennas and Propagation, 2015Co-Authors: Zhang Qinghua, Sorine Michel, Admane MehdiAbstract:Today's advanced reflectometry methods provide an efficient solution for the diagnosis of electric Transmission line hard faults (open and short circuits), but they are much less efficient for soft faults, in particular, for faults resulting in spatially smooth variations of characteristic impedance. This paper attempts to fill an important gap for the application of the inverse scattering transform to reflectometry-based soft fault diagnosis: it clarifies the relationship between the reflection coefficient measured with reflectometry instruments and the mathematical object of the same name defined in the inverse scattering theory, by reconciling finite length Transmission Lines with the inverse scattering transform defined on the infinite interval. The feasibility of this approach is then demonstrated by numerical simulation of lossless Transmission Lines affected by soft faults, and by the solution of the inverse scattering problem effectively retrieving smoothly varying characteristic impedance profiles from reflection coefficients.
