ABSTRACT
Because the electromagnetic transients program (EMTP) is based on circuit theory assuming transverse electromagnetic (TEM) mode propagation, it cannot give an accurate solution for a high-frequency transient that involves non-TEM mode propagation. Additionally, the EMTP cannot deal with a circuit of unknown parameters. A numerical electromagnetic analysis (NEA) method, on the other hand, can deal with a transient associated with both TEM and non-TEM mode propagations. Furthermore, it requires no circuit parameters. However, this method results in numerical instability if the analytical space, the boundary conditions, the cell size, etc., are not appropriate. Also, it requires massive computer resources, and the existing codes are not generalized enough to deal with various types of transients, especially in a large network.
