Interaction between a DC Traction System and an AC Power System Through Earth-return Circuits

Abstract

The article describes a problem that occurs in electrified railway transportation, involving the interaction between the earth-return circuits of different power systems. One of the analysed circuits is the earth-return circuit of a high-voltage power grid, the other is the return path of a 3 kV DC traction power supply system. The paper presents the results of the field tests carried out so far and discusses a mathematical model developed in the Matlab-Simulink environment with the aim of determining the interaction between both of the said systems. Keywords: earthing, traction substation, traction return system

Analysis of the neutral grounding modes influence on the reliability characteristics of local systems with renewable energy sources

“…One of these areas in recent years has been the use of a distributed generation system to provide power to non-traction consumers of railway transport [1][2][3][4]. Such systems are called local systems and in their specificity of work, structure and execution: they significantly differ from general-purpose systems [5][6][7][8][9]. A feature of the work of these systems is the provision of power to consumers of the first and second categories, namely: circuits of automatic and semiautomatic blocking, signalling, communications, outdoor track lighting, automatic heating control systems for buildings etc.…”