Linear regressions and structural correlations for models of stray-current circuits

The effect of the electric rail transport stray currents on an underground metal structure (UMS) and to calculate the protective devices, there is a need of some characteristics to relate their regime parameters to those of traction currents, are described. The mean values of parameters, obtained by averaging the random processes of their changes with relatively short occurrence times, are reduced to some unified base value. The reduction of parameter values is performed when tracing potential diagrams for rail track or UMS, or when recalculating the drain current into other traction conditions. A mean value of some parameter is assumed characterizing the regime of back traction currents, and measured either during a long time, or during rush-hours.