Non-insulation track circuit

Abstract

The invention provides a non-insulation track circuit comprising a main track circuit and a small track circuit, wherein the main track circuit comprises a first transmitter, a first receiver, a first capacitance compensator, a second capacitance compensator and a first tuning zone; the small track circuit comprises a second transmitter, a second receiver and a second tuning zone; the first tuning zone and the second tuning zone both comprise first tuning units, second tuning units and hollow coils; the first capacitance compensator, the first tuning units, the hollow coils, the second tuning units and the second capacitance compensator are connected to the main track circuit in parallel; the first receiver in the second tuning zone is connected with the first tuning units, and the second transmitter is connected with the second tuning units; the first transmitter in the first tuning zone is connected with the first tuning units; the first tuning units and the second tuning units are all used for transmitting signals of the neighboring zones of a short circuit in the zones and presenting compatibility for the signals of the zones and form parallel resonance with loops of the tuning zones.

Description

technical field [0001] The invention relates to the field of rail transit automation, in particular to a non-insulated track circuit Background technique [0002] At present, non-insulated track circuits mostly use electrically isolated track circuits, which can reduce the need for rail cutting due to transmission isolation of adjacent track circuits, and at the same time make the return flow of locomotive traction current more smooth. However, there is a shunt "dead zone" of a certain length in the tuning area of ​​the traditional electrically isolated non-insulated track circuit. If the train falls completely in the "dead zone", the track circuit will not be able to check the occupancy of the locomotive; After the "zero impedance" function of two adjacent tuning units is lost at the same time, the signal passes over the adjacent section to the next section, so that the next track circuit with the same frequency is unconditionally picked up, resulting in the rail breaking o...

AI Technical Summary

Problems solved by technology

[0005] During the research and practice of the prior art, the inventors of the present invention found that in the existing implementations, most of the air-core coils and two-element tuning units currently used in the tuning area have relatively large DC impedance, and the parallel resonance Q value It is difficult to improve, especially under the general use of integral ballast beds in high-speed railways, as the DC impedance of the rail increases, the impedance of the tuning area decreases relatively, which has a great impact on the transmission length of the track circuit, and because there is no Many faults can only be handled by maintenance personnel, causing great difficulties for maintenance personnel and increasing maintenance costs

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