Electric power system

Electric power devices are fixed electric traction devices enabling a continuous transmission of power from the public distribution system to electric traction units and other energy systems.

Electric power devices are fixed electric traction devices enabling a continuous transmission of power from the public distribution system to electric traction units and other energy systems like low-voltage transformer stations, external lighting systems, heating of switch-points and energy devices in buildings. Fixed devices comprise sub-stations with connection power lines and cable conduits, and the catenary, as well as a sub-station system for the remote control of electric devices which is currently under construction. The majority of electrified lines of Slovenske železnice operate under a Direct Current system (DC) with a rated voltage of 3 kV, with Alternating Current system (AC) available at border sections applying the voltages  used by the neighbouring countries Austria (15 kV, 16.67 Hz) and Croatia (25 Hz, 50 Hz).

By using power lines or cable conduits, electric power is transmitted from the medium-voltage network to the sub-stations where it is transformed and rectified, and distributed to sections of the catenary. With regard to demands of the line, two rectifier aggregate units with a rated current of 667 A, 1000 A or 1500 A are installed in each of the 17 sub-stations.

The catenary transmits power to the vehicles and is electrically divided into longitudinal and transversal sections with more than 700 switches. An individual section comprises the catenary of one track between stations, or of a group of tracks at a station. Owing to the relatively high traction currents, two contact wires with a cross-section of 100 mm2 and a support wire with a cross-section of 120 mm2 are installed along the main tracks, with the total cross-section of the catenary on the main tracks amounting to 320 mm2. Electrified tracks in total stretch over 900 km, and include over 24,000 catenary support poles.

The development of stable devices for electric traction is aimed to modernize existing devices and increase the rate of electrification on the current, as well as planned rail lines. In the area of sub-stations, the installation of newer devices and the remote control system is planned to continue, while catenary improvements will involve using better materials and equipment and reducing impacts on the environment.

 

slovenian_railway_network_electrical

 

Basic data
Length of electrified lines 503.5 km

 

Statistical data
Source: Statistical data SŽ
Electric traction system 3000 V
Length of electrified lines (km) 503.5 km
  double-track lines 330.9 km
  single-track lines 172.6 km
Number of power supply stations 17