Method for avoiding inopportune stress of inputs of pilot housings of track circuit by interference signals within railway signalling stations, involves renewing characteristics of installations realized in static logic

摘要

The method involves assuring control of inputs of pilot housings (SBP) from railway security relay e.g. NS1 relay or from any other technical architecture ensuring an equivalent security level by a final stage. Characteristics of installations realized in static logic are renewed by globally equivalent concept. Interfacing of inputs is exclusively established within track circuit (CDV1) containing the housings. Switching of control signals of the inputs is performed to assure same reference potential of two wires of same input of the housings in absence of valid command.