CN-116331293-B - Non-insulation frequency shift track circuit and insulation joint thereof

Abstract

The invention discloses an insulation-free frequency shift track circuit and an insulation joint thereof, wherein the insulation joint comprises a resonance unit, a first traction balance unit and a second traction balance unit, the first traction balance unit, the resonance unit and the second traction balance unit are sequentially connected in parallel with the track circuit between two adjacent sections, the first traction balance unit comprises a first inductor and a second capacitor which are connected in series, and the second traction balance unit comprises a fourth inductor and a third capacitor which are connected in series. In the scheme, the resonance unit is used for preventing the frequency shift signal of the track circuit of the adjacent section from being transmitted in a cross-zone mode, and the two traction balance units are used for guaranteeing the traction reflux balance of the track circuit in a series resonance mode, so that compared with the prior art, the scheme can further optimize the traction reflux to keep the balance function, and the scheme has the characteristics of simple structure, obvious effect, convenience in popularization and the like.

Inventors

• WEN SHULAI
• LU JIANG
• ZHAI YILIN
• ZHANG MINGFANG
• ZHANG LEI

Assignees

• 北京铁路信号有限公司

Dates

Publication Date

20260505

Application Date

20211224

Claims (9)

1. 1. The insulation joint for the uninsulated frequency shift track circuit is characterized by comprising a resonance unit, a first traction balance unit (10), a second traction balance unit (20), a third traction balance unit (50) and a fourth traction balance unit (60); The resonance unit includes a first resonance unit (30) and a second resonance unit (40); The third traction balancing unit (50), the first traction balancing unit (10), the first resonance unit (30), the second resonance unit (40), the second traction balancing unit (20) and the fourth traction balancing unit (60) are sequentially connected in parallel with a track circuit between two adjacent sections; The first traction balance unit (10) comprises a first inductor (L1) and a second capacitor (C2) which are connected in series, the second traction balance unit (20) comprises a fourth inductor (L4) and a third capacitor (C3) which are connected in series, the first traction balance unit (10) and the resonance unit and the second traction balance unit (20) form series resonance on traction reflux signals, and the impedance is 0 and is used for realizing double-channel redundant traction current balance.
2. 2. The insulation joint for an uninsulated frequency shift rail circuit according to claim 1, wherein said first resonant unit (30) comprises a fourth capacitor (C4) and a second inductor (L2) connected in series.
3. 3. The insulation joint for an uninsulated frequency shift rail circuit according to claim 1, wherein said second resonant unit (40) comprises a fifth capacitor (C5) and a third inductor (L3) connected in series.
4. 4. The insulation joint for an insulation-less frequency shift rail circuit according to claim 1, wherein the third traction balancing unit (50) includes a first capacitor (C1), and the fourth traction balancing unit (60) includes a second capacitor (C2).
5. 5. The insulation joint for an insulation-free frequency shift rail circuit according to claim 1, wherein a distance between the third traction balancing unit (50) and the second resonance unit (40) or the second traction balancing unit (20) is a first preset distance l 1 ; The distance between the fourth traction balance unit (60) and the first traction balance unit (10) or the first resonance unit (30) is a second preset distance l 2 ; the distance between the first traction balance unit (10) and the second resonance unit (40) is a third preset distance l3, or the distance between the first resonance unit (30) and the second traction balance unit (20) is a third preset distance l 3 .
6. 6. The insulation joint for an insulation-free frequency shift rail circuit according to claim 5, wherein the first preset distance l 1 is 10-20 m.
7. 7. The insulation joint for an insulation-free frequency shift rail circuit according to claim 5, wherein the second preset distance l 2 is 10-20 m.
8. 8. The insulation joint for an insulation-free frequency shift rail circuit according to claim 5, wherein the third preset distance l 3 is 5-10 m.
9. 9. An insulation-free frequency shift track circuit comprises an insulation joint, and is characterized in that the insulation joint is an insulation joint for the insulation-free frequency shift track circuit according to any one of claims 1-8.

Description

Non-insulation frequency shift track circuit and insulation joint thereof Technical Field The invention relates to the technical field of track circuits, in particular to an uninsulated frequency shift track circuit and an insulated joint thereof. Background The insulating joint in the non-insulated track circuit can be used for realizing electrical isolation in the adjacent track circuit, ensuring smooth transmission of signals of the section and simultaneously ensuring balance of traction reflux, so that the non-insulated track circuit is an important component part in the non-insulated track circuit. The ZPW-2000A track circuit system is widely applied to the domestic railway signal field, and has the functions of mainly realizing the inspection of the occupied idle state of the steel rail section and effectively maintaining the stability, safety and reliability of railway operation. As one of the currently advanced automatic blocking systems, ZPW-2000A track circuit system mainly realizes electrical isolation of track circuit signals between adjacent sections by means of electrically insulating joints, so that the electrically insulating joints have a critical role in the system. A schematic diagram of the active electrical insulation joint structure in the ZPW-2000A track circuit system is shown in FIG. 1. For the port 1, the capacitor C1 and the inductor L1 form two elements to form series resonance to the section B signal f 2, the impedance is about zero, a short circuit effect is formed, the transmission of the signal to the section A can be prevented, meanwhile, the circuit presents capacitance to the section A signal f 1, parallel resonance with the inductor formed by the long steel rail and the air coil SVA appears, high impedance is presented, the voltage at the port 1 is improved, the other side port 2 is provided with C2, C3 and L2, a three-element structure is formed, wherein the C2 and L2 form series resonance to the section A signal f 1, the impedance is about zero, the transmission of the signal to the section B can be effectively prevented, meanwhile, the three-element structure presents capacitance to the section B signal f 2, parallel resonance with the inductor formed by the long steel rail and the air coil SVA appears, high impedance is presented, and the voltage at the port 2 is improved. From the above, it can be seen that the air core coil SVA acts significantly in the insulated joint structure, and in addition to this, the SVA presents a low resistance to the traction current, helping to balance the traction current balance between the two rails. In general, the insulation joint length l is about 29m. Through long-term application, the insulation joint is found to have a zoned dead zone due to structural design defects, namely, when a train runs into the insulation joint, effective shunt inspection cannot be realized, at the moment, the rail circuit system judges that the rail is in an idle state, and the shunt dead zone can cause fault upgrading and is avoided as much as possible. In fact, there is currently no better solution to the split dead zone. In addition, due to the requirement on the speed increase of train operation or the existence of larger traction current in a heavy-load line, when the condition of unbalance of the larger traction current occurs in a steel rail, the larger current passes through the air core coil SVA, on one hand, although the SVA presents low resistance to the traction current, when a certain resistance value still causes larger pressure difference at two ends of the SVA, the traction current can be connected in series into a track circuit system to form interference on the track circuit system, on the other hand, the larger traction current has higher requirement on the tolerance of the air core coil when flowing through the SVA, so that the damage of the air core coil is accelerated, and finally failure is caused. In summary, it is necessary to propose a new structure design of the insulation joint, thoroughly solve the design defect existing in the current insulation joint, and eliminate the potential safety hazard of the track circuit system caused by the insulation joint. Disclosure of Invention In view of the above, the invention provides an insulation joint for an insulation-free frequency-shift track circuit, which can further optimize the traction reflux to maintain the balance function on the basis of ensuring the insulation of adjacent sections of the insulation-free track circuit to signals with different frequencies, and has the characteristics of simple structure, obvious effect, convenience in popularization and the like. The invention also provides an insulation-free frequency shift track circuit applying the insulation joint for the insulation-free frequency shift track circuit. In order to achieve the above purpose, the present invention provides the following technical solutions: an insulation joint for an insulation-free frequen