Identification Of Transmission Line Parameters From Temporal Measurements Of Currents And Voltages In Their Terminals: Influence Oh The Length Line

The objective of this paper is to show a methodology to estimate transmission line parameters. The method is applied in a single-phase transmission line using the method of least squares. In this method the longitudinal and transversal parameters of the line are obtained as a function of a set of measurements of currents and voltages (as well as their derivatives with respect to time) at the terminals of the line during the occurrence of a short-circuit phase-ground near the load. The method is based on the assumption that a transmission line can be represented by a single circuit π. The results show that the precision of the method depends on the length of the line, where it has a better performance for short lines and medium length. © 2012 IEEE.Hofmman, L., Series expansions for line series impedances considering different specific resistances, magnetic permeabilities, and dielectric permittivities of conductors, air, and ground (2003) IEEE Trans. on Power Delivery, 18 (2), pp. 564-570. , AprilPortela, C., Tavares, M.C., Modeling, simulation and optimization of transmission lines. Applicability and limitations of some used procedures (2002) IEEE PES Transmission and Distribution 2002, São Paulo, BrazilSemlyen, A., Some frequency domain aspects of wave propagation on nonuniform lines (2003) IEEE Trans. on Power Delivery, 18 (1), pp. 315-322. , JanIndulkar, C.S., Ramalingam, K., Estimation of transmission line parameters from measurements (2008) Electrical Power and Energy Systems, 30 (5), pp. 337-342Martinez, J.A., Gustavsen, B., Durbak, D., Parameters determination for modeling system transients - Part I: Overhead lines (2005) IEEE Trans. Power Delivery, 20 (3), pp. 2038-2044. , JulyWang, Y.J., Liu, S.J., A review of methods for calculation of frequency-dependent impedance of overhead power transmission lines (2001) Proc. Natl. Sci. Counc., 25 (6), pp. 329-338Dommel, H.W., (1986) EMTP Theory Book, , VancouverCabral, M.A.P., Goldfeld, P., (2008) Curso de Álgebra Linear, p. 196. , Rio de JaneiroSchulze, R., Schegner, P., Zivanovic, R., Parameters identification of unsymmetrical transmission lines using fault records obtained from protective relays (2010) IEEE Transactions on Power Delivery, , Decembe