TRACK CIRCUIT MONITORING DEVICE

PROBLEM TO BE SOLVED: To detect all abnormality on a track circuit on the basis of a little data in a case where a judging and computing unit judges generation of abnormality in a track circuit by specifying a cause of the abnormality among an alternating current power source device, an impedance element, a track zone and a track relay, and outputting a result of specification. SOLUTION: A current detector 25 is inserted into a cable connected to an output terminal of a power source device 3. A voltage detector 26 is connected to the output terminal of the power source device 3 or a terminal of a track 100, and a phase difference between two voltages applied to a main coil 40 and a local coil 41 of a track relay is detected by a phase difference detector 27. A computing device 35, in which the transmitting current signal I, the transmitting voltage signal v, the receiving voltage signal V and a phase difference signal are input, outputs the existence output 44 of abnormality of the track circuit and the specifying output 45 of a part, in which abnormality is generated, in the case where abnormality is generated. With this structure, though the detected data does not correspond to all the circuit element, a cause of abnormality can be specified.