Search for additional criteria to estimate the electrical connection state under the impact of currents of different value

Abstract

The paper reports on search for additional criteria to estimate the electrical connection state in the operating mode characterized by abrupt change in electric current parameters. The results obtained in the course of theoretical studies are based on the use of methods of mathematical and experimental modeling of thermal processes in electrical connections of a traction power supply system. New criteria for estimating the state of the electrical connection for cyclic traction load have been found out. Investigation of the defectiveness ratio in the “heating-cooling” cycle makes it possible to estimate the current state of the electrical connection under service conditions.

Algorithm for calculating the rail-ground potential in heavy load conditions

“…The latter assumption allows applying the superposition method [12] when calculating the resulting value of the rail-to-ground potential created by several electric rolling stock (ERS). Thus, to find the resulting "rail-ground" potential at a point with the x coordinate, it is enough to calculate the complex values of the potentials at this point created by each individual ERS, present them in algebraic form, sum the real and imaginary parts, and then calculate the module of the resulting value [13].…”