A signal processor for monitoring a railway track circuit is provided. The signal processor is arranged to receive a first relay drive signal (CT1) from the track circuit coil and a second relay drive signal (CT2) from a local coil and processed to produce an output signal (SYNCH-OUT). The output signal is determined by the relative phase between the first and second signals. The output signal is used to raise an alarm condition if the signals are incorrectly phased or if the control coil is subject to interference from a traction current. The signal processor may comprise a synchronous rectifier which may operate on either input signal. Where the second signal is rectified it may be used as a time reference.
RAILWAY TRACK CIRCUIT MONITOR
ÜBERWACHUNGSVORRICHTUNG FÜR GLEISSTROMKREISE
DISPOSITIF DE SURVEILLANCE POUR CIRCUITS DE VOIE FERRÉE
2018-02-07
Patent
Electronic Resource
English
IPC: | B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC |