EMTP modeling of electromagnetic transients in multi-mode coaxial cables by finite sections

This paper introduces a way of modeling electromagnetic propagation in conductive materials, termed the method of finite sections. It addresses the issues of modeling frequency-dependent impedances and frequency-dependent coupling of conductors. Its use is demonstrated by application to transient modeling of a multi-mode coaxial cable system in the Electromagnetic Transients Program (EMTP), a situation which currently eludes accurate representation. In addition to its use in modeling coaxial cables, the method is applicable to modeling of overhead lines, pipe-type cables, transformer cores and walls, lightning arrestors and other situations in which sufficient planar or cylindrical symmetry exists. The method provides the only accurate EMTP means of modeling wave propagation in non-linear resistive and/or inductive Conductors.