Protection of Longitudinal Power-Supply Lines from the Electromagnetic Impact of a Traction Network

Simulation and investigation have been performed for the electromagnetic impact of the traction network exerted on the adjacent longitudinal power-supply line in an open-circuit mode, in a loading mode when there is an electric rolling stock on the stretch, and in a short-circuit mode of the traction network. The simulation of electromagnetic impact has been performed with the use of a method of mirror images, for which it is necessary to solve the D’Alembert equations in cylindrical coordinates. The analysis and synthesis of the asymmetry in voltages and linear electrical parameters in phase wires, resulting from the electromagnetic impact of the traction network, indicates a possible excess in the rated values according to GOST (State Standard) 32144-2013, especially under conditions when the high-voltage line is mounted on the supports of the contact network. Methods are proposed for reducing the asymmetry of the electrical parameters of an overhead longitudinal power-supply line originating from the electromagnetic impact of the traction network. The protection of longitudinal power-supply lines from the electromagnetic impact of the traction network based on the transposition of the wires of an overhead high-voltage power-supply line is considered most efficient.