THEORY OF FIELD-EXCITED NETWORKS

The transient analysis of field-excited networks having complex config urations and nonlinear loads is performed by using a combined frequenc y- and time-domain procedure. The simulation models of the line-sectio ns are defined in the frequency-domain based on the exact formulation of Maxwell's equations. New expressions of the per-unit-length (p.u.l. ) series impedances and shunt admittances are used in order to overcom e the limitation of the Carson formulation in case of a poorly conduct ing ground-plane and in the presence of very fast transients. An effic ient procedure is applied for reducing the computation effort of the p rocedure in case of complex large-dimension networks. Calculations are carried out to predict the overvoltages induced by an EMP-plane wave on a 20 kV-power network above a highly lossy ground and on a signal 1 8-port-multiconductor network.