Wideband Parameter Estimation of Single-Phase Frequency Dependent Transmission Lines

This paper introduces a parameter estimation method for single-phase overhead lines with frequency dependent electrical parameters. The proposed method is based on an analytical approach to solve the frequency domain 2-port nodal model for the series impedance and shunt conductance of the line per unit length as a function of the frequency. Terminal voltage and current measurements, obtained from software EMTP/ATP, are used as inputs. The estimated parameters are compared to those calculated analytically, demonstrating high accuracy of the method for a wide frequency range. The proposed method is aimed at its application in transmission line protection and fault location based on terminal transient response.