Transition system for communicating special rail backflow system with running rail backflow system
By designing a dedicated rail return system and a running rail return system in the urban rail transit system, the problem of stray current leakage between the two reflow systems is solved, seamless operation and electrical isolation are achieved, and the civil engineering structure of rail transit and metal pipelines along the route are protected, saving transformation costs.
Patent Information
- Application Number
- CN202411692196.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-03-11
AI Technical Summary
In the existing urban rail transit system, there is a spurious current leakage problem between the walking rail reflow system and the dedicated rail reflow system, which leads to corrosion of the civil engineering structure of the rail transit and the metal pipeline along the line, and the transformation cost is high, making it difficult to achieve a seamless transition between the two systems.
A transition system is designed to connect the special rail reflow system and the running rail reflow system, a return conversion zone is set between the two reflow systems, and the switching and electrical isolation of the two reflow systems is achieved through independent traction power supply, shared contact network power supply and electrical isolation, so as to avoid stray currents from circulating each other.
The seamless operation of the dedicated rail reflow system and the running rail reflow system is realized, which avoids stray current leakage, protects the civil engineering structure of rail transit and metal pipelines along the line, saves transformation costs, and simplifies the implementation of the project.
Smart Images
Figure CN119590294A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of rail transportation, and in particular relates to a transition system in which a special rail return system and a running rail return system are connected. Background Art
[0002] At present, most urban rail transit in China adopts running rails (rails) for return current, and the running rails have the functions of both train support and return current. When the running rails return current, a potential difference will be generated to the ground. Affected by factors such as the running rail fastener materials, construction and environment, the transition resistance of the running rails to the ground is difficult to be made very large, and the running rails will leak stray current to the ground. When the leaked stray current is too large, it will cause corrosion of the steel bars of the rail transit civil engineering structure and the buried metal pipelines or metal structures along the line. Most urban rail transit passes through densely populated areas, and there are many oil and gas pipelines along the line. The property owners of some urban oil and gas pipelines reported that the pipelines were affected by stray currents. Using traditional running rail return current to solve the pipeline corrosion problem itself is very costly and difficult to cure.
[0003] The dedicated rail return system uses a dedicated rail return that is independent of the train running rail. The ground leakage resistance can reach hundreds or even thousands of times that of the running rail, which can perfectly solve the problem of stray current leakage. More and more cities are interested in using the dedicated rail return system. Independent new lines can use a unified dedicated rail return system throughout the line, but for the extension of existing lines, if the existing running rail return system is converted to a dedicated rail return system, the cost is very high and the operation may also be interrupted; if the existing line is not converted and the two systems are not reasonably transitioned, it will cause the dedicated rail return area to leak stray current to the rail return area or the rail return area to flow stray current to the dedicated rail return area, thereby destroying the stray current protection effect of the dedicated rail return system. Summary of the invention
[0004] In view of the above-mentioned problems, the present invention provides a transition system suitable for the connection between the dedicated rail return system and the running rail return system of urban rail transit, which can realize the through operation of trains on lines adopting two different return systems, avoid the mutual flow of stray currents between the dedicated rail return area and the rail return area, and avoid the running rail ignition when the train passes through the interface position of the two return areas.
[0005] The present invention achieves this object through the following technical solutions:
[0006] A transition system in which the dedicated rail return system and the running rail return system are connected, and a return conversion area with a length not less than one train length is set between the running rail return system and the dedicated rail return system, and the train switches the return system in this area;
[0007] Both the dedicated rail return system and the running rail return system are equipped with independent traction power supplies; the positive busbar of the traction power supply supplying power to the dedicated rail return system and the positive busbar of the traction power supply supplying power to the running rail return system supply power to the overhead line respectively; in the return conversion area, the dedicated rail return system and the running rail return system share the overhead line to supply power to the train; the negative busbar of the traction power supply supplying power to the dedicated rail return system and the negative busbar of the traction power supply supplying power to the running rail return system are electrically isolated, the dedicated rail return equipment is connected to the dedicated return rail, and the running rail return equipment is connected to the running rail;
[0008] The dedicated return rail is electrically isolated from the running rail;
[0009] The dedicated rail return system is equipped with a running rail transition zone with a length of not less than one train length on the side connecting the return conversion zone. The rails in the running rail transition zone are insulated, and insulating junctions are set at both ends of the rails in the running rail transition zone.
[0010] The through-ground conductor is electrically isolated at the interface between the return current conversion zone and the running rail transition zone.
[0011] Furthermore, the traction power supply supplying power to the dedicated rail return system and the traction power supply supply supplying power to the running rail return system are independently provided with a positive bus and an Internet access device or share a set of positive bus and an Internet access device.
[0012] Furthermore, each traction power supply comprises:
[0013] It is composed of rectifier unit only;
[0014] It is composed of a rectifier unit and a regeneration device;
[0015] It is composed of a rectifier unit and a bidirectional converter;
[0016] It is composed only of a bidirectional converter.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] 1. The present invention can realize the through-running of trains on lines adopting a dedicated return system and lines adopting a running rail return system, avoiding the standard modification of the running rail system and saving engineering investment.
[0019] 2. The dedicated rail return system and the negative pole of the running rail return system of the present invention are electrically isolated, which prevents the stray current from flowing between the dedicated rail return area and the running rail return area, and avoids destroying the stray corrosion protection effect of the dedicated rail return system.
[0020] 3. A running rail transition zone is provided between the dedicated rail return system and the running rail return system of the present invention to prevent the running rail from igniting when the train passes through the interface of the two return systems.
[0021] 4. The dedicated rail return system and the running rail return system of the present invention are electrically isolated by the through-ground conductor, thereby preventing stray current from being conducted between the two return systems through the through-ground conductor, thereby avoiding damage to the stray current corrosion protection effect of the dedicated rail return system.
[0022] 5. In the present invention, the dedicated rail return system and the running rail return system in the return conversion area share the contact network, and do not need to be independently set up, which is simple to implement and saves engineering investment. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.
[0024] Figure 1 It is a schematic diagram of a transition system applicable to a Y-shaped line of the present invention;
[0025] Figure 2 This is a schematic diagram of a transition system applicable to a straight-line line transfer transition station with limited civil engineering conditions;
[0026] Figure 3 The present invention is a schematic diagram of a transition system applicable to a straight-line line transfer transition station with sufficient civil engineering conditions. DETAILED DESCRIPTION
[0027] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to be able to fully convey the scope of the present invention to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0028] The present invention discloses a transition system suitable for connecting the dedicated rail return system and the running rail return system of urban rail transit, and a return conversion zone is set between the running rail return system and the dedicated rail return system. The return conversion zone is set in the platform area of the return system conversion transition station, and the length of the return conversion zone is not less than the length of one train. The return conversion zone has the functions of both the dedicated rail return system and the running rail return system, and return can be achieved on both the dedicated rail and the running rail in the return conversion zone. The train realizes the switching of the two return modes in the vehicle in the return conversion zone.
[0029] The running rail return system includes the overhead contact network, running rails (also called steel rails), traction power supply, access equipment, return equipment, grounding device, and through-ground conductor. The dedicated rail return system includes the overhead contact network, dedicated return rail, traction power supply, access equipment, return equipment, grounding device, and through-ground conductor. The access equipment includes the access circuit breaker, access disconnector, cross-zone disconnector, and the connecting cables between the aforementioned equipment and between each equipment and the overhead contact network. The return equipment includes the return box, steel rail potential limiting device or negative ground single-conductor device, and the connecting cables between the aforementioned equipment and between each equipment and the dedicated return rail or running rail. The through-ground conductor includes the through-ground conductor laid in conjunction with the overhead contact network and the through-ground conductor laid in conjunction with the ring network cable.
[0030] Both the dedicated rail return system and the running rail return system are equipped with independent traction power supplies; the positive pole of the traction power supply is connected to the positive busbar, and the negative pole is connected to the negative busbar; the positive busbar of the traction power supply is connected to the overhead line through the Internet access device; the negative busbar of the traction power supply is connected to the dedicated return rail or the running rail through the return device. The positive busbar of the traction power supply that supplies power to the dedicated rail return system and the positive busbar of the traction power supply that supplies power to the running rail return system supply power to the overhead line respectively; in the return conversion area, the dedicated rail return system and the running rail return system share the overhead line to supply power to the train; the negative busbar of the traction power supply that supplies power to the dedicated rail return system is electrically isolated from the negative busbar of the traction power supply that supplies power to the running rail return system, the dedicated rail return equipment is connected to the dedicated return rail, and the running rail return equipment is connected to the running rail; the dedicated return rail is electrically isolated from the running rail.
[0031] The dedicated rail return system is equipped with a running rail transition zone with a length of not less than one train length on the side connecting the return conversion zone. The rails in the running rail transition zone are insulated and installed, and insulating junctions are set at both ends of the rails in the running rail transition zone; the through-ground conductor is electrically isolated at the interface between the return conversion zone and the running rail transition zone.
[0032] The train switches between the two return modes in the return conversion area set up in the platform area of the return transition station. A running track transition area is set between the return conversion area and the dedicated track return area to prevent the running track from igniting when the train passes through the interface of the two return systems. The length of the running track transition area shall not be less than 1 train length.
[0033] Two sets of traction power supplies are set in the return conversion area to supply power to the dedicated rail return system and the running rail return system respectively. The two sets of traction power supplies are connected to a negative bus respectively, and the two return system busbars are electrically isolated. One of the traction power supply negative busbars is connected to the dedicated rail, and the other traction power supply negative busbar is connected to the running rail. The corresponding return equipment is also set independently.
[0034] In the return conversion area, the dedicated rail return system and the running rail return system share the same overhead line power supply. The two traction power supplies supply power to the overhead line in the return conversion area through the Internet access equipment. The traction power supply positive busbars and Internet access equipment of the two power supply systems can be set independently or shared, which is determined in combination with the line type and civil engineering conditions of the return system conversion transition station. There are three types of line types in the return system conversion transition station:
[0035] 1. Y-shaped line
[0036] Specific as Figure 1 As shown in the figure, the branch line is led out from a station in the middle of the main line, and the two sections of the line form a Y-shaped line. The main line adopts a running rail return system, and the branch line adopts a dedicated rail return system. The branch line lead-out station serves as a transition station for the two return systems. In this case, the traction power supply positive busbars and Internet access equipment of the two systems are set independently.
[0037] II. Limited civil construction conditions for the transition station of the straight line
[0038] Specific as Figure 2 As shown in the figure, in a straight-line line, one section of the line uses a running rail return system, and the other section uses a dedicated rail return system. The civil engineering conditions of the conversion transition station at the interface of the two return systems are limited, and only the Internet access equipment can be shared. In this case, the traction power supply positive busbar and Internet access equipment of the two systems are shared.
[0039] 3. The civil construction conditions of the transfer station of the straight line are sufficient
[0040] Specific as Figure 3 As shown, in a straight-line line, one section of the line adopts the running rail return system, and the other section adopts the dedicated rail return system. The civil engineering conditions of the conversion transition station at the interface of the two return systems are sufficient, and the conditions for the independent setting of the traction power supply positive busbars and Internet access equipment of the two power supply systems are met. In this case, the traction power supply positive busbars and Internet access equipment of the two systems are independently set.
[0041] The two traction power supply systems of the dedicated rail return system and the running rail return system include the following four situations:
[0042] 1. It is composed of rectifier units only;
[0043] 2. It is composed of a rectifier unit and a regeneration device;
[0044] 3. It is composed of a rectifier unit and a bidirectional converter;
[0045] 4. It is composed only of a bidirectional converter.
[0046] The present invention has been described in detail above through embodiments, but the contents described are only exemplary embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. The protection scope of the present invention is defined by the claims. Anyone who utilizes the technical solution described in the present invention, or a technician in the field, inspired by the technical solution of the present invention, designs a similar technical solution within the essence and protection scope of the present invention to achieve the above technical effects, or makes equal changes or improvements to the scope of application, etc., shall still fall within the scope of protection covered by the patent of the present invention.
Claims
1. A transition system in which a dedicated rail return system and a running rail return system are connected, characterized in that: A return flow conversion area with a length not less than one train length is set between the running rail return flow system and the dedicated rail return flow system; Both the dedicated rail return system and the running rail return system are equipped with independent traction power supplies; the positive busbar of the traction power supply supplying power to the dedicated rail return system and the positive busbar of the traction power supply supplying power to the running rail return system supply power to the overhead line respectively; in the return conversion area, the dedicated rail return system and the running rail return system share the overhead line to supply power to the train; the negative busbar of the traction power supply supplying power to the dedicated rail return system and the negative busbar of the traction power supply supplying power to the running rail return system are electrically isolated, the dedicated rail return equipment is connected to the dedicated return rail, and the running rail return equipment is connected to the running rail; The dedicated return rail is electrically isolated from the running rail; The dedicated rail return system is equipped with a running rail transition zone with a length of not less than one train length on the side connecting the return conversion zone. The rails in the running rail transition zone are insulated, and insulating junctions are set at both ends of the rails in the running rail transition zone. The through-ground conductor is electrically isolated at the interface between the return current conversion zone and the running rail transition zone.
2. The transition system for connecting the dedicated rail return system and the running rail return system as claimed in claim 1 is characterized in that: The traction power supply supplying power to the dedicated rail return system and the traction power supply supply supplying power to the running rail return system are independently equipped with positive busbars and Internet access equipment or share a set of positive busbars and Internet access equipment.
3. The transition system for connecting the dedicated rail return system and the running rail return system as claimed in claim 1 is characterized in that: Each traction power supply consists of: It is composed of rectifier unit only; It is composed of a rectifier unit and a regeneration device; It is composed of a rectifier unit and a bidirectional converter; It is composed only of a bidirectional converter.