New transmission line model with frequency dependent parameters in the time domain

A new transmission line model in the time domain for the simulation of transients in the short time range is presented. It is based on the subdivision of the transmission line into short lossless line segments which are connected to each other by damping networks consisting of constant ohmic resistances and by distortion networks, which simulate the frequency dependence of the line parameters and are described by state space equations. The model parameters can be calculated from the impedances of subconductors which result from the division of the ground into subconductors. Therefore they can be determined directly from the geometrical dimensions of the line-ground-configuration. Simulation results of the new model show a very good agreement with the results of the generally accepted J. Marti-Model of the ATP-EMTP which also considers frequency dependent parameters.