Transient analysis of wave processes for multi-conductor transmission lines with branches using FDTD

Based on the multi-conductor transmission lines (MTLs), the three-phase 500 kV busbars and power lines in a 500 kV substation are modeled as the MTLs with branches in order to evaluate the electromagnetic fields radiated from the substation during the switching operation. The iterative formulae are presented to determine the boundary conditions at the node of the branches in this paper. The wave processes of voltage and current distributed along the busbars and the power lines without load in the substation are calculated with the finite-difference time-domain method (FDTD) when the circuit breakers and the disconnect switchers are closed. The numerical results are in agreement on ones calculated by Bergeron´s method