Simulation of a Return Current System for AC Power Traction Network

Abstract

Abstract The paper deals the problem of the reverse traction current’s asymmetry in the rail circuit under heavy haul traffic conditions for AC railways. The consequences and the possible causes of the negative influence of asymmetry of the return current system for AC power traction network are considered. For analyse the degree of influence of various factors on the reverse traction current’s asymmetry the return current system model is created in Multisim 12.0 software. The simulation model consists of the reverse traction current block-section. The model allows researching the influence of various factors including environmental conditions such as temperature and humidity, power and type of throttle-transformers, rail track ballast resistance on the conditions of the return current system breakdown. Particular attention is paid to the study of the breakdown voltage critical values on the spark gap in the return current circuit on the example of a railway section located in the Far East of Russia. Simulation results show that in addition to improving electrical characteristics, a positive effect of reducing asymmetry of the return current system for AC power traction network can be achieved by cleaning of the track ballast layer.