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CN-117657243-B - Track circuit

CN117657243BCN 117657243 BCN117657243 BCN 117657243BCN-117657243-B

Abstract

The application provides a track circuit which comprises a transmitting side and a receiving side, wherein the transmitting side and the receiving side comprise a receiving-transmitting transformer, a lightning-protection transformer, a transmission cable and a matching transformer, the receiving-transmitting device is connected with a steel rail through the receiving-transmitting transformer, the lightning-protection transformer, the transmission cable and the matching transformer in sequence, the receiving-transmitting device in the transmitting side is a transmitting device, the receiving-transmitting device in the receiving side is a receiving device, a resonant circuit is added on a line of the transmitting side and/or the receiving side, so that the power of the transmitting device is reduced, and only the signal intensity in the section is enhanced.

Inventors

  • WEN SHULAI
  • ZHANG LEI
  • XIE LONG
  • WANG JIASHUO
  • CAI YUYANG
  • YU SHUYONG

Assignees

  • 北京铁路信号有限公司

Dates

Publication Date
20260505
Application Date
20220831

Claims (8)

  1. 1. A track circuit is characterized by comprising a transmitting side and a receiving side; the transmitting side and the receiving side comprise a receiving-transmitting transformer, a lightning protection transformer, a transmission cable, a matching transformer and a tuning unit; The receiving and transmitting device is connected with a steel rail through the receiving and transmitting transformer, the lightning protection transformer, the transmission cable and the matching transformer in sequence, and the tuning unit is arranged between two connection points of the matching transformer and the steel rail; the receiving device in the receiving side is a receiving device; The method comprises the steps of adding a resonant circuit on a line of a transmitting side and/or a receiving side so as to reduce the power of the transmitting device and only enhance the signal intensity in the section; The first capacitor is connected with the secondary winding of the matching transformer in parallel, the first capacitor and the secondary winding of the matching transformer form a parallel resonant circuit, and the secondary winding of the matching transformer adopts a tap design; And extracting two terminals from the secondary winding of the matching transformer to be connected into the steel rail for signal transmission, and arranging the second capacitor between the secondary winding of the matching transformer and the steel rail so that when the train shunts at the tuning unit on the corresponding side, the second capacitor and the secondary winding of the matching transformer are changed from series resonance to parallel resonance.
  2. 2. The track circuit of claim 1 wherein the resonant circuit provides at least one stage of enhancement to the track circuit signal.
  3. 3. The track circuit of claim 2 wherein the resonant circuit provides a two-stage enhancement of the track circuit signal.
  4. 4. The track circuit of claim 1 wherein the number of turns of the secondary winding of the matching transformer is varied such that the first capacitance and the secondary winding of the matching transformer form a parallel resonant circuit.
  5. 5. The track circuit of claim 1 wherein one end of the second capacitor is connected to a tap of the secondary winding of the matching transformer; the other end of the second capacitor is connected with a connecting point between one end of the steel rail and one end of the tuning unit respectively; the other end of the tuning unit is respectively connected with the other end of the steel rail and the other tap end of the secondary winding of the matching transformer.
  6. 6. The track circuit of claim 1 wherein said resonant circuit comprises a third capacitor; the third capacitor is connected with the secondary winding of the transceiver transformer in series, and the third capacitor and the secondary winding of the transceiver transformer form a series resonance circuit.
  7. 7. The track circuit of claim 1 wherein the resonant circuit comprises a first capacitance, a third capacitance, and a second capacitance; The first capacitor is connected with the secondary winding of the matching transformer in parallel, and the first capacitor and the secondary winding of the matching transformer form a parallel resonant circuit; extracting two terminals from the secondary winding of the matching transformer to be connected into a steel rail for signal transmission, and arranging a second capacitor between the secondary winding of the matching transformer and the steel rail so that when a train shunts at a tuning unit on the corresponding side, the second capacitor and the secondary winding of the matching transformer are changed from series resonance to parallel resonance; the third capacitor is connected with the secondary winding of the transceiver transformer in series, and the third capacitor and the secondary winding of the transceiver transformer form a series resonant circuit.
  8. 8. The track circuit according to claim 1, wherein a resonant circuit is added to the lines on both the transmitting side and the receiving side.

Description

Track circuit Technical Field The invention belongs to the technical field of railway signals, and particularly relates to a track circuit. Background The track circuit is mainly used for checking the use states of occupied track, idle track and the like, monitoring the integrity of the steel rail, and is an important guarantee for improving the running safety and reliability of a train, and in the current ZPW-2000A track circuit, signal output is carried out through a transmitting device, and a receiving device analyzes signals to judge the use state of the steel rail, so that the power of the transmitting device needs to be improved to improve the identification capability of the receiving device on the signals, and the power of the transmitting device is high in strength when the signals reach the receiving device. The method increases the power of the track circuit transmitting device, which is not beneficial to the increase of the service life of the track circuit transmitting device, and the receiving device can receive the interference of other signals besides the normal signals of the track circuit, thereby reducing the recognition of the signals by the receiving device on the other hand. Disclosure of Invention In view of the above, an object of the present invention is to provide a track circuit for reducing power of a transmitting device of the track circuit, improving strength of a received signal, and further weakening interference to a power frequency signal. The application discloses a track circuit, which comprises a transmitting side and a receiving side; the transmitting side and the receiving side comprise a receiving-transmitting transformer, a lightning protection transformer, a transmission cable, a matching transformer and a tuning unit; The receiving and transmitting device is connected with a steel rail through the receiving and transmitting transformer, the lightning protection transformer, the transmission cable and the matching transformer in sequence, and the tuning unit is arranged between two connection points of the matching transformer and the steel rail; the receiving device in the receiving side is a receiving device; and adding a resonant circuit on the line of the transmitting side and/or the receiving side so as to reduce the power of the transmitting device and only enhance the signal intensity in the section. Optionally, in the track circuit, the resonant circuit performs at least one stage of enhancement on the track circuit signal. Optionally, in the track circuit, the resonant circuit performs two-stage enhancement on the track circuit signal. Optionally, in the track circuit, the resonant circuit includes a first capacitor; The first capacitor is connected with the secondary winding of the matching transformer in parallel, and the first capacitor and the secondary winding of the matching transformer form a parallel resonant circuit. Optionally, in the track circuit, the number of turns of the secondary winding of the matching transformer is changed, so that the first capacitor and the secondary winding of the matching transformer form a parallel resonant circuit. Optionally, in the track circuit, the resonant circuit comprises a second capacitor, wherein a secondary winding of the matching transformer adopts a tap design; And extracting two terminals from the secondary winding of the matching transformer to be connected into the steel rail for signal transmission, and arranging the second capacitor between the secondary winding of the matching transformer and the steel rail so that when the train shunts at the tuning unit on the corresponding side, the second capacitor and the secondary winding of the matching transformer are changed from series resonance to parallel resonance. Optionally, in the track circuit, one end of the second capacitor is connected with a tap of a secondary winding of the matching transformer; the other end of the second capacitor is respectively connected with a connecting point between one end of the steel rail and one end of the resonance unit; The other end of the resonance unit is respectively connected with the other end of the steel rail and the other tap end of the secondary winding of the matching transformer. Optionally, in the track circuit, the resonant circuit includes a third capacitor; the third capacitor is connected with the secondary winding of the transceiver transformer in series, and the third capacitor and the secondary winding of the transceiver transformer form a series resonance circuit. Optionally, in the track circuit, the resonant circuit includes a first capacitor, a third capacitor and a second capacitor; The first capacitor is connected with the secondary winding of the matching transformer in parallel, and the first capacitor and the secondary winding of the matching transformer form a parallel resonant circuit; extracting two terminals from the secondary winding of the matching transformer to be connected in