CN107972533B - In-station bidirectional reflux circuit and implementation method - Google Patents
In-station bidirectional reflux circuit and implementation method Download PDFInfo
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- CN107972533B CN107972533B CN201710979304.0A CN201710979304A CN107972533B CN 107972533 B CN107972533 B CN 107972533B CN 201710979304 A CN201710979304 A CN 201710979304A CN 107972533 B CN107972533 B CN 107972533B
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- 238000010992 reflux Methods 0.000 title claims abstract description 51
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims description 12
- 238000013459 approach Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 18
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000011835 investigation Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/18—Railway track circuits
- B61L1/181—Details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The invention provides an in-station bidirectional reflux circuit and an implementation method thereof, wherein the circuit comprises a left track circuit and a right track circuit which are adjacent, two ends of coils of two choke transformers are respectively connected on two steel rails of the two adjacent track circuits on two sides of an insulating joint in parallel, and central connecting wires of the two adjacent choke transformers are connected with unsaturated reflux equipment in series. Some beneficial effects of the embodiments of the present invention may include: for the audio track circuit in the station, the loop impedance attenuation of an external circuitous loop is far larger than that of a steel rail in a normal state by ensuring that under the condition of rail break, rail break inspection is realized under the condition of double-end backflow, and the problem brought under the condition of single-side backflow is effectively solved.
Description
Technical Field
The invention relates to the technical field of railway power supply, in particular to an in-station bidirectional reflux circuit and an implementation method thereof.
Background
In an electrified station, in order to cause a traction current to flow back to a traction substation, the connection diagram is shown in fig. 1, in which the midpoint of a choke transformer of an adjacent track circuit is connected.
However, if the dual-choke track circuit is adopted, the intermediate points are connected to form a circuitous circuit easily, and a third track effect is formed. By "third rail effect" is meant that in addition to the dual-rail transmission channel, a return (meander) circuit is present, by means of which a track circuit signal can still be transmitted after a rail break of a track section. Once the terminal voltage of the section of track relay is higher, even the excitation is kept, the track circuit is not subjected to rail break detection, and serious threat is caused to driving safety.
In order to avoid the formation of a third rail in a rail circuit, the midpoints of choke transformers at certain insulation joints in a station are not communicated, so that traction current can only flow back from one side, and a backflow cutting point is formed on the other side, which is commonly called as 'one-end blocking' one-side backflow. As shown in fig. 2-3, which are plan views of six station tracks of the jinghu high-speed rail, four "one-head-block" cutting points are provided on the side track (the circle positions marked with "cutting points" in the figures).
The single-side backflow of the traction current formed by arranging a 'head block' in the station brings about the following problems.
(1) Electric arc burned steel rail and insulating joint
The high-speed railway motor train unit has high speed and high traction power, and electric arcs can be brought by the cut-off of traction current when the wheel pair passes through the cut-off point. The steel rail is burnt by electric arc, the mechanical performance of the steel rail at the joint part can be directly influenced, the service life of the steel rail is shortened, and meanwhile, the motor train unit has safety risk when passing through.
(2) Personal injury
When the normal receiving and dispatching vehicle is found through investigation, the voltage at two ends of a cut-off point reaches about 100v at most, and the voltage is measured according to railway equipment: the electrical safety of the fixed equipment, the ground connection and the regulation of a loop (EN 50211-3-2010), the limit voltage and the duration time of the allowed contact of the railway line pressing line are shown in a table 1, and potential safety hazards are brought to the operation of field operation personnel.
TABLE 1
(3) Damaged trackside and car body equipment
If the fault of the interruption of the backflow channel occurs at the position of the unilateral backflow, 27.5kV high-power traction current directly damages the vehicle body and personal safety, so that equipment connected with the steel rail is broken down and burnt, an insulation joint is broken down, and even the switch machine is operated by mistake.
(4) Station insulation joint breakdown caused by fog flash
A plurality of porcelain bottles are used as insulators to support wires in a power transmission network and a motor train unit, when severe haze weather occurs, due to the moisture absorption effect of a dirty layer on the surface of the porcelain bottles, the insulation withstand voltage is greatly reduced, so that an instantaneous short circuit vehicle body is caused, a contact network is communicated with a steel rail where a train is located, instantaneous overcurrent can be generated, traction current passes through the vehicle body and the steel rail, the voltage at two ends of an insulation joint at a backflow cut-off position is raised instantaneously, and the insulation joint is broken down.
Disclosure of Invention
The invention provides an intra-station bidirectional reflux circuit and an implementation method thereof, which are used for solving the problem of low safety of a reflux mode of the traction current of the conventional electrified station flowing back to a traction substation.
The invention provides an in-station bidirectional reflux circuit which comprises a left adjacent track circuit and a right adjacent track circuit, wherein two ends of coils of two choke transformers are respectively connected on two steel rails of the two adjacent track circuits on two sides of an insulating joint in parallel, and central connecting lines of the two adjacent choke transformers are connected with unsaturated reflux equipment in series.
Wherein the unsaturated reflux equipment comprises an unsaturated reflux reactor.
The unsaturated reflux reactor comprises a reflux inductance and a compensation capacitor, the reflux inductance is connected in series with a central connecting line of two adjacent choke transformers, and the compensation capacitor is connected in parallel with the adjacent track circuits.
Wherein the frequency shift impedance of the unsaturated reflux reactor is not less than 2 omega in the state of 1700 Hz.
And the equivalent track circuit sending end FS is connected in parallel to the adjacent track circuit.
And the equivalent track circuit receiving end JS is connected in parallel on the adjacent track circuit.
Some beneficial effects of the embodiments of the present invention may include: for the audio track circuit in the station, the loop impedance attenuation of an external circuitous loop is far larger than that of a steel rail in a normal state by ensuring that under the condition of rail break, rail break inspection is realized under the condition of double-end backflow, and the problem brought under the condition of single-side backflow is effectively solved.
The invention provides a method for realizing an intra-station bidirectional reflux circuit, which comprises the following steps:
the in-station bidirectional reflux circuit comprises at least one lateral line track circuit on the same side as the positive line track circuit:
and the in-station bidirectional return circuits are respectively arranged at the choking midpoints of two adjacent track sections at the joint of the receiving approach of the positive track circuit and the track section of the lateral track circuit.
Wherein, when the side track circuit quantity with positive line track circuit homonymy exceeds one, still include:
and the in-station bidirectional reflux circuit is arranged on an insulation joint of a trapezoidal turnout which is connected with the receiving access of the main track circuit and the main track circuit.
Some beneficial effects of the embodiments of the present invention may include: for the audio track circuit in the station, the loop impedance attenuation of an external circuitous loop is far larger than that of a steel rail in a normal state by ensuring that under the condition of rail break, rail break inspection is realized under the condition of double-end backflow, and the problem brought under the condition of single-side backflow is effectively solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art choke transformer with center point connections;
FIG. 2 is a schematic diagram of a "head-up" switching point structure adopted at a station of a certain six-track in the prior art;
FIG. 3 is a detail view of the structure of the cut-off point in the circled portion of FIG. 2;
FIG. 4 is a schematic diagram of the configuration of the intra-station bi-directional return circuit of the present invention;
FIG. 5 is a detailed schematic diagram of the intra-station bi-directional return circuit of the present invention;
FIG. 6 is a schematic diagram of an implementation principle of a bidirectional reflux circuit in a 4-strand station;
fig. 7 is a schematic diagram of the implementation principle of the bidirectional return circuit in the 5-strand station.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 4 is a schematic structural diagram of the bidirectional reflux circuit in the station according to the present invention, and as shown in fig. 4, the bidirectional reflux circuit in the station according to this embodiment includes two adjacent track circuits on the left and right, two ends of the coil of two choke transformers are respectively connected in parallel to two steel rails of the two adjacent track circuits on two sides of the insulation joint, and the center connection line of the two adjacent choke transformers is connected in series with an unsaturated reflux device. .
Specifically, the unsaturated reflux equipment comprises an unsaturated reflux reactor. In fig. 4, BEN represents a frequency shift pulse choke transformer, DH represents a reflux reactor, and the reflux reactor is serially connected to the middle of the choke transformer at two ends of the insulation section, is connected with the midpoint of the choke transformer, and communicates a "one-end-blocking" position.
As shown in fig. 5, the unsaturated reflux reactor includes a reflux inductance connected in series to the center connection line of two adjacent choke transformers, and a compensation capacitor connected in parallel to the adjacent track circuits. In the figure, FS represents an equivalent track circuit transmitting end, which is connected in parallel to an adjacent track circuit; JS denotes an equivalent track circuit receiving terminal, which is also connected in parallel to the adjacent track circuit.
As shown in fig. 4-5, loop lengths above 1200 cannot be achieved due to station-to-station limitations on track length. Therefore, an unsaturated reflux reactor is connected in series with the central connecting line of two adjacent choke transformers in the station to form an external circuitous loop, the impedance of the external circuitous loop is compensated to be more than 1200 meters, namely the frequency shift impedance needing to be connected into the circuitous loop in series cannot be less than 2 ohms at 1700Hz, and the rail break inspection of a side track is guaranteed.
In the station bidirectional reflux circuit in the embodiments of fig. 4 to 5, for the station audio track circuit, by ensuring that the loop impedance attenuation of the external circuitous loop is far greater than the rail impedance attenuation in a normal state under the rail break condition, the rail break inspection is realized under the double-end reflux condition, and the problem brought by the single-side reflux condition is also effectively solved.
Fig. 6 is a schematic diagram illustrating an implementation principle of a bidirectional reflux circuit in a 4-station track station, and as shown in fig. 6, when two-wire main track circuits each include one lateral track circuit, as shown by a straight arrow in fig. 6, the bidirectional reflux circuit (shown in the figure) in the station is respectively arranged at choke midpoints of two adjacent track sections at a junction of a pickup approach of the main track circuit and a track of the lateral track circuit.
The invention also discloses another implementation method of the bidirectional reflux circuit in the station, and fig. 7 is a schematic diagram of the implementation principle of the bidirectional reflux circuit in the 5-station track station, as shown in fig. 7, under the condition that a double-line positive line track circuit comprises a lateral line track circuit and two lateral line track circuits respectively, as shown by a straight line arrow in fig. 7, the bidirectional reflux circuit in the station (a reflux reactor shown in the figure) is arranged at the choke midpoints of two adjacent track sections at the joint of a positive line track circuit receiving approach and a lateral line track circuit of three lateral line track circuits in total.
In addition, the intra-station bidirectional return circuit (a return reactor shown in the figure) is provided on the main track circuit side including the two side track circuits, at an insulation joint of a trapezoidal switch in which the receiving route of the main track circuit is connected to the main track circuit.
In the station bidirectional reflux circuit implementation method in the embodiments of fig. 6 to 7, for the station audio track circuit, by ensuring that the loop impedance attenuation of the external circuitous loop is much larger than the rail impedance attenuation in a normal state under the rail break condition, the rail break inspection is implemented under the double-end reflux condition, and the problem brought by the single-side reflux condition is also effectively solved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A bidirectional reflux circuit in a station is characterized by comprising a left adjacent track circuit and a right adjacent track circuit, wherein two ends of coils of two choke transformers are respectively connected in parallel to two steel rails of the two adjacent track circuits on two sides of an insulating joint, and central connecting lines of the two adjacent choke transformers are connected in series with unsaturated reflux equipment;
the unsaturated reflux equipment comprises an unsaturated reflux reactor;
the frequency shift impedance of the unsaturated reflux reactor is not less than 2 omega in a 1700Hz state;
under the condition that each double-line main track circuit comprises one side line track circuit, an in-station bidirectional return circuit is respectively arranged at the choking midpoints of two adjacent track sections at the joint of the receiving approach of the main track circuit and the track section of the side line track circuit;
under the condition that the double-line positive line track circuit comprises a lateral line track circuit and two lateral line track circuits respectively, choke midpoints of two adjacent track sections at the joint of a positive line track circuit receiving approach and a lateral line track circuit of the three lateral line track circuits are provided with an in-station bidirectional return circuit respectively;
an in-station bidirectional reflux circuit is arranged on an insulation joint of a trapezoidal turnout which is connected with a receiving approach of the main track circuit and the main track circuit at one side of the main track circuit comprising two lateral track circuits.
2. The circuit of claim 1, wherein the unsaturated reflux reactor comprises a reflux inductance and a compensation capacitance, the reflux inductance is connected in series with the center connection of two adjacent choke transformers, and the compensation capacitance is connected in parallel with the adjacent track circuits.
3. A circuit according to any one of claims 1-2, characterized in that the equivalent track circuit transmitting side FS is connected in parallel to the adjacent track circuit.
4. Circuit according to any of claims 1-2, wherein an equivalent track circuit receiving terminal JS is connected in parallel to said adjacent track circuit.
5. An intra-station bidirectional return circuit implementation method, characterized in that the intra-station bidirectional return circuit according to any one of claims 1 to 4 is used, and comprises at least one side track circuit on the same side as the main track circuit:
and the in-station bidirectional return circuits are respectively arranged at the choking midpoints of two adjacent track sections at the joint of the receiving approach of the positive track circuit and the track section of the lateral track circuit.
6. The method of claim 5, wherein when the number of siding track circuits on the same side as the siding track circuit exceeds one, further comprising:
and the in-station bidirectional reflux circuit is arranged on an insulation joint of a trapezoidal turnout which is connected with the receiving access of the main track circuit and the main track circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710979304.0A CN107972533B (en) | 2017-10-19 | 2017-10-19 | In-station bidirectional reflux circuit and implementation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710979304.0A CN107972533B (en) | 2017-10-19 | 2017-10-19 | In-station bidirectional reflux circuit and implementation method |
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| Publication Number | Publication Date |
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| CN107972533A CN107972533A (en) | 2018-05-01 |
| CN107972533B true CN107972533B (en) | 2020-07-31 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201235831Y (en) * | 2008-06-04 | 2009-05-13 | 北京全路通信信号研究设计院 | Four-wire lead security device of phase-sensitive track circuit |
| WO2011016736A4 (en) * | 2009-08-07 | 2011-06-30 | Auckland Uniservices Limited | Roadway powered electric vehicle system |
| CN102658783A (en) * | 2012-05-08 | 2012-09-12 | 北京全路通信信号研究设计院有限公司 | Device for realizing safe base reflow of voice frequency system track circuit in railroad station |
| CN103552486A (en) * | 2013-11-13 | 2014-02-05 | 北京全路通信信号研究设计院有限公司 | Track circuit |
| CN206141365U (en) * | 2016-11-02 | 2017-05-03 | 广州铁路职业技术学院 | General fast electric Railway reflux unit and system |
-
2017
- 2017-10-19 CN CN201710979304.0A patent/CN107972533B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201235831Y (en) * | 2008-06-04 | 2009-05-13 | 北京全路通信信号研究设计院 | Four-wire lead security device of phase-sensitive track circuit |
| WO2011016736A4 (en) * | 2009-08-07 | 2011-06-30 | Auckland Uniservices Limited | Roadway powered electric vehicle system |
| CN102658783A (en) * | 2012-05-08 | 2012-09-12 | 北京全路通信信号研究设计院有限公司 | Device for realizing safe base reflow of voice frequency system track circuit in railroad station |
| CN103552486A (en) * | 2013-11-13 | 2014-02-05 | 北京全路通信信号研究设计院有限公司 | Track circuit |
| CN206141365U (en) * | 2016-11-02 | 2017-05-03 | 广州铁路职业技术学院 | General fast electric Railway reflux unit and system |
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| Publication number | Publication date |
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| CN107972533A (en) | 2018-05-01 |
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