EVS-EN 50617-1:2015

This European Standard is intended to be used in the context of the Interoperability Directive and the associated technical specification for interoperability relating to the control-command and signalling subsystems of the trans-European rail system. It is intended for use by manufacturers of track circuits and other forms of train detection systems using the rails as part of their detection principles as well as by Infrastructure Managers/Infrastructure Companies and National Safety Authorities, who are responsible for introducing and certifying new train detection systems on interoperable lines. This European Standard specifies the basic parameters of track circuits associated with the interference current limits for RST in the context of interoperability defined in the form of Frequency Management. The bands and limits defined in the Frequency Management are under evaluation for their economic impact. The evaluation is conducted by the European Railway Agency. The limits for compatibility between rolling stock and track circuits currently proposed in this standard allow  provision for known interference phenomena linked to traction power supply and associated protection (over  voltage, short-circuit current and basic transient effects like inrush current and power cut-off). These effects  are assessed using modelling tools that have been verified by the previous European research project RAILCOM. This European Standard describes the factors accounted for in the compatibility limits that will be published in section 3.2 of the TSI CCS Interface document, ref. ERA/ERTMS/033281 and further defines a methodology to derive the level of immunity required for the track circuit. This methodology is dependent on the application of the track circuit. The actual immunity limits of the track circuits are not defined in this standard and remain the responsibility of individual infrastructure managers, NSAs and/or suppliers of train detection systems.