Track circuit

Abstract

The invention discloses a track circuit which comprises a main transmitter, a first attenuation redundancy isolator, a first receiver and a track relay, wherein the main transmitter is connected with the first end of a steel track through a first transmission cable, generates mixed frequency-shift pulse signals, and sends the mixed frequency-shift pulse signals out through the steel track; the first attenuation redundancy isolator is connected with the second end of the steel track through a second transmission cable and divides the received mixed frequency-shift pulse signals into frequency-shift signals and pulse signals; the first receiver is connected with the first attenuation redundancy isolator; the track relay is connected with the first receiver; the first receiver is used for receiving the frequency-shift signals and the pulse signals, and performing analytical treatment on the frequency-shift signals and the pulse signals, comparing treated results with the preset condition, and driving the track relay to work according to the compared result. According to the track circuit provided by the invention, the frequency-shift signals and pulse signals are integrated into a whole, and various conditions which possibly occur on the steel track are considered comprehensively, so that safe driving of trains can be ensured.

Description

technical field [0001] The invention relates to the field of rail transit automation, and more specifically relates to a rail circuit. Background technique [0002] With the rapid development of railway construction, track circuits have been widely used in my country as the basic safety equipment of railway signals. Track circuits are circuits composed of rails of a section of railway line as conductors, which are used to automatically and continuously detect whether a certain section of line is used by rolling stock. Occupied to ensure the safety of driving. [0003] At present, the railway circuits used in the station usually include 25Hz phase-sensitive track circuits, 480-type track circuits, high-voltage pulse track circuits and ZPW-2000A integrated track circuits. Among them, the 25Hz phase-sensitive track circuit and the 480-type track circuit can check whether the corresponding section of the rail is in an idle state or an occupied state when the rail is in good cont...

AI Technical Summary

Problems solved by technology

Among them, the 25Hz phase-sensitive track circuit and the 480-type track circuit can check whether the corresponding section of the rail is in an idle state or an occupied state when the rail is in good contact with the train wheel (the contact resistance is not greater than the standard shunt resistance), that is, under normal circumstances , that is to check whether the corresponding section of the rail is occupied by the train; and when the rail has a bad shunt, the 25HZ phase-sensitive track circuit and the 480-type track circuit will lose the function of checking whether the corresponding section of the rail is idle or occupied; and the 25HZ phase-sensitive track The circuit and the 480-type track circuit also do not have the inspection functions of rail insulation damage, rail breakage and rail lead wire breakage in the corresponding section. The 25HZ phase-sensitive track circuit and the 480-type track circuit cannot keep the rail in an occupied state for maintenance; and they do not have the function of transmitting information to on-board equipment

[0004] The ZPW-2000A integrated track circuit has the function of transmitting information to the on-board equipment; and in the case of good contact between the rail and the train wheel, that is, under normal circumstances, the ZPW-2000A integrated track circuit can check whether the corresponding section of the rail is idle or occupied status, that is, to check whether the rail in the corresponding section is occupied by the train; in addition, the ZPW-2000A integrated track circuit has the function of checking the broken rail and the broken wire of the rail, that is, when the rail in the corresponding section is broken or the lead wire is broken , ZPW-2000A integrated track circuit can keep the rail in the occupied state; but when the rail has a bad shunt or some branch parallel jumpers are broken, the ZPW-2000A integrated track circuit will lose the ability to check whether the corresponding section of the rail is free or occupied At the same time, the ZPW-2000A integrated track circuit does not have the function of insulation damage detection, that is, when the insulation damage occurs in the corresponding section of the rail, the ZPW-2000A integrated track circuit cannot make the corresponding section of the rail in the occupied state

[0005] The high-voltage track circuit has the characteristics of high rail surface voltage and signal asymmetry. When the rails are slightly rusted and dirty or some branch parallel jumpers are broken, it can check whether the corresponding section of the rail is idle or occupied; but it does not It has the function of checking the broken rail and the broken wire of the rail, that is, when the rail in the corresponding section is broken or the lead wire of the rail is broken, the high-voltage track circuit cannot keep the rail in an occupied state for maintenance, and it does not have the ability to send to the vehicle The function of the device to pass information

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