Overhead and buried conductor system

In this paper a novel computer code for the analysis of both aerial and buried system of conductors in wide frequency range is presented. A hybrid approach has been applied enabling incorporation into a single linear system both lumped circuit parameters and distributed parameters evaluated through a rigorous electromagnetic field analysis. The system of discretised conductors is replaced by a suitable set of elementary current sources. These current sources may be plain or hollow, bare or insulated, finely oriented and interconnected in the three dimensional space, which is considered formed by two half-spaces each one homogeneous, linear and isotropic. Therefore the code does not pose geometric and topological limitations and enables us to compute voltages and currents at the source (boundary) elements as well as vector potentials and electric and magnetic fields anywhere in the surrounding medium. Propagation phenomena and reaction currents in the dispersing medium are duly accounted for; for practical applications, the code may be applied for frequencies up to 1 MHz, thus covering the frequency range of usual interest in power systems. Examples of application are given, namely computation of ground current distribution of a long transmission line under fault conditions and electromagnetic interactions between power systems and transmission systems or other buried passive conductors.