Physical Model of AC Traction Networks for Simulating Emergency Modes

The actual average values of the impedance of traction networks operated in Bulgaria are used in the work. Impedance values are measured during controlled short-circuits in different feeder zones. Based on a computer model, the traction network reactions during a short-circuit are checked. A physical model was developed for simulating short-circuits in traction nets at different distances from the traction substation and the used voltage and current transformers.