Track Circuit Power Supply Vital Monitor

摘要

A power supply vital monitor for track circuits for railway systems includes a track segment that is separated from adjacent segments by electric joints. Each track segment includes a signal transmitting unit and receiving units for transmitting and receiving train presence detection signals and/or transmitting or receiving communication signals between the train and the track segment. The transmitting unit and receiving units are connected to a common power supply line. To avoid an erroneous clearing of an occupied status caused by spurious signals on the power supply line affecting reception of the train detection signals, each receiving unit includes a first and a second channel, which connect the receiver with the corresponding track circuit and with a power supply sensor connected to the power supply line. Switches enable and disable connections of the receivers to the corresponding track circuit and to the corresponding power supply sensor.

主权项

1. A track circuit comprising:
a power supply vital monitor adapted to monitor a power supply signal of railway systems; a plurality of track segments (11, 12) of predetermined length, forming continuous rails, and electric joints (2), each consisting of a conductor, which connects together the rails (111, 112) at ends of each track segments; and electric signal transmitting units (3) and receiving units (4) operatively coupled to each track segment (11, 12) and adapted to receive and transmit train presence detection signals within each track segments and/or transmit communication signals between a train (7) and the track segments (11, 12), each transmitting unit (3) and each receiving unit (4) being connected to a common power supply line (5), wherein: each receiving unit (4) comprises at least two parallel signal processing channels, which include a first (41) and a second (42) channel, each channel (41, 42) comprising a receiver (411, 421) connected to the track circuit and to a respective power supply sensor (412, 422) connected to a common power supply line (5) through communication lines, each single communication line connecting the receiver with both the track circuit and the respective power supply sensor, each communication line having a first enabling/disabling device (413, 423) in order to enable/disable a connection of the said receiver (411, 421) with the corresponding track circuit, and a second enabling/disabling device (414, 424) in order to enable/disable the connection of the said receiver (411, 421) with the power supply sensor (412, 422), and the receivers (411, 421) being connected to an analyzing unit (44), which analyzes output signals of the said receivers (411, 421).