A universal model for the computation of the electromagnetic interference on earth return circuits

The increasing size of modern electricity supply systems, as well as the higher operating and short-circuit currents of the high voltage systems have been matched by an over-spreading network of earth return circuits (pipelines, cables, etc.) close to high-voltage installations, resulting in a closer inductive and, in the vicinity of earth electrodes, conductive coupling of both system types. The view of the acceptance or inadmissibility of these interferences resulting from the couplings requires the quantification of the physical effects. A computer-simulation leads to reliable forecasts with respect to system stresses and suitable countermeasures. A universally valid algorithm for the calculation of interference voltages and currents in networks of optional topology or with several exposures to power lines is presented and applied to practical problem cases. The algorithm developed is superior to existing models as it simulates uniformly both the inductive and the conductive effects on earth return circuits