Three-fracture overhead line system electric phase splitting device and power supply method

Abstract

The invention discloses a three-fracture overhead line system electric phase splitting device and a power supply method. The device is of a composite joint structure formed by sequentially connecting a first insulation joint, a second insulation joint and a third insulation joint. The composite joint structure forms three continuous insulation fractures on the contact net, and a first neutral section and a second neutral section which are separated by the insulation fractures. The device further comprises a first isolation switch, a second isolation switch and a third isolation switch. Wherein the first isolating switch is connected between a first power supply arm and the first neutral section, the second isolating switch is connected between the first neutral section and the second neutral section, and the third isolating switch is connected between a second power supply arm and the second neutral section; and the first isolating switch, the second isolating switch and the third isolating switch are all in an opening state in a normal driving state. Through the composite joint structure, the construction difficulty and the influence on traffic operation are reduced, and implementation of transformation is facilitated.

Description

Technical Field

[0001] This application relates to the field of railway overhead contact system technology, and more specifically, to a three-break overhead contact system phase-splitting device and power supply method. Background Technology

[0002] As a crucial component of modern transportation systems, electrified railways generally employ single-phase AC power supply for their traction power supply systems. To effectively balance the three-phase load of the power system and achieve electrical isolation between the power supply arms, the overhead contact line must undergo segmented insulation treatment along the track. These sections used to isolate different phases are known as electrical phase-separating devices. These devices are not only a key component of the traction power supply system but also core facilities ensuring power supply safety and preventing cross-phase short-circuit accidents. Their technical performance and operational reliability directly determine the efficiency and safety level of railway transportation.

[0003] In the technological evolution of electrical phase-separation devices, high-speed railways and major trunk lines have widely adopted anchor-section articulated electrical phase-separation to replace the earlier device-type electrical phase-separation. Among them, the seven-span, three-break electrical phase-separation has become a favored technical route because it can effectively avoid the risk of phase-to-phase short circuits in dual-pane EMU trains without high-voltage busbar connections by adding an insulation break. In existing technologies, the conventional approach to achieving a seven-span, three-break design is to use a separate anchor section structure. That is, the entire electrical phase-separation section is mechanically designed as an independent anchor section with its own independent middle anchor, lower anchor, and tension compensation device, forming a complete and closed mechanical-electrical unit.

[0004] However, the existing three-phase power splitting technology faces two major challenges in engineering applications: First, its structural adaptability is insufficient. Its structure as a separate anchor section conflicts with the layout of existing line equipment, resulting in significant interference with existing facilities and difficulties in implementation. Second, its emergency power supply capability is limited. When the neutral section design or parking location is not ideal, the existing equipment lacks effective emergency power supply means, making it difficult to achieve reliable rescue without power outages. Summary of the Invention

[0005] In response to at least one defect or improvement requirement of the prior art, the present invention provides a three-break contact network phase-splitting device and power supply method to solve the problems in the prior art that when modifying existing lines, there is significant interference with existing facilities, implementation difficulties, and a lack of effective emergency power supply means, making it difficult to achieve reliable rescue under uninterrupted power supply conditions.

[0006] To achieve the above objectives, according to the first aspect of the present invention, a three-break contact network phase-splitting device is provided, wherein the device comprises a first insulating joint, a second insulating joint, and a third insulating joint connected in sequence to form a composite joint structure; The composite joint structure forms three continuous insulation breaks in the contact wire, as well as a first neutral segment and a second neutral segment separated by them. The device also includes a first disconnecting switch, a second disconnecting switch, and a third disconnecting switch; The first disconnecting switch is connected between the first power supply arm and the first neutral section, the second disconnecting switch is connected between the first neutral section and the second neutral section, and the third disconnecting switch is connected between the second power supply arm and the second neutral section; the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are all in the open state under normal operating conditions.

[0007] In one possible implementation, the first insulating joint, the second insulating joint, and the third insulating joint share a joint support, such that the total number of spans of the composite joint structure is a preset value, and the air insulation gap of the insulating break is configured to meet the insulation safety requirements of a preset voltage level.

[0008] In one possible implementation, the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are electrically operated disconnecting switches and are connected to an external remote control system to receive closing and opening commands.

[0009] In one possible implementation, the remote control system is configured to: when a signal is detected or received that the train is stuck in the first neutral section, perform the logical operation of closing the second and third disconnect switches to establish an emergency power supply circuit from the second power supply arm to the stuck train.

[0010] In one possible implementation, the remote control system is configured to: when a signal is detected or received that the train is stuck in the second neutral section, perform the logical operation of closing the first disconnect switch and the second disconnect switch to establish an emergency power supply circuit from the first power supply arm to the stuck train.

[0011] In one possible implementation, the lengths of both the first neutral section and the second neutral section are greater than the length of the pantograph of a single target EMU, and the sum of the lengths of the first neutral section and the second neutral section is greater than the maximum spacing between the two pantographs of the target EMU.

[0012] According to a second aspect of the present invention, a power supply method for a three-break contact network phase-splitting device is also provided, the three-break contact network phase-splitting device based on any of the above implementations comprising: Determine the section of the train that is stuck in the electrical phase-separating device; If it is determined that the train is stuck in the first neutral section, a closing command is sent to the second disconnect switch and the third disconnect switch to form a power supply circuit from the second power supply arm through the second neutral section and the first neutral section to the train; After confirming that the train has departed, restore the second and third disconnect switches to the open state.

[0013] One possible implementation also includes: If it is determined that the train is stuck in the second neutral section, a closing command is sent to the first disconnect switch and the second disconnect switch to form a power supply circuit from the first power supply arm through the first neutral section and the second neutral section to the train. After confirming that the train has departed, restore the first and second disconnect switches to the open state.

[0014] In one possible implementation, before issuing a closing command to the disconnector switch, a logic interlocking check is performed, including: Confirm that the feeder circuit breaker of the target power supply arm is in the closed state; Confirm that the corresponding disconnect switch of the non-target power supply arm is in the open state; The closing command will be executed only if all of the above conditions are met.

[0015] One possible implementation also includes: After the power supply circuit is formed, monitor the current value in the power supply circuit; When the current value is detected to be continuously lower than the preset load threshold for a period of time, it is determined that the train has left and an instruction is issued to restore the closed disconnect switch to the open state.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: This invention provides a three-break contact network phase-splitting device. The device utilizes a composite joint structure comprised of a first, second, and third insulating joint. This eliminates the need for large-scale alterations to existing line layouts and facility locations, avoiding the dismantling and reconstruction of numerous contact network supports and cables. This reduces construction difficulty and impact on traffic operations, facilitating retrofitting. The modular design allows for factory prefabrication and testing of the insulating joints and disconnecting switches, enabling rapid on-site installation and shortening the construction cycle. For emergency power supply and rescue, the three continuous insulating breaks and two neutral sections provide space for emergency operations. In emergencies, the power supply circuit can be altered by operating the disconnecting switches, enabling power conversion and allocation between different power supply arms to provide emergency power to stranded trains and ensure safe passenger evacuation. The independently installed disconnecting switches allow for reliable rescue without power interruption. Furthermore, the multiple insulating breaks provide multiple layers of protection against power interference and short-circuit faults between different power supply arms. When a fault occurs in a part of the contact network, the disconnecting switches can quickly isolate the fault area, preventing the fault from spreading and ensuring the stable operation of the entire contact network system. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structural principle of an embodiment of the three-break contact network phase-splitting device provided by the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0020] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0021] This invention provides a three-break contact network phase-splitting device and power supply method, which are described below.

[0022] Please see Figure 1 , Figure 1 The schematic diagram of a three-break contact network phase-splitting device provided by the present invention is shown. In a specific embodiment of the present invention, a three-break contact network phase-splitting device is disclosed. The device is composed of a first insulating joint, a second insulating joint and a third insulating joint connected in sequence to form a composite joint structure. The composite joint structure forms three continuous insulation breaks in the contact wire, as well as a first neutral segment and a second neutral segment separated by them. The device also includes a first disconnecting switch, a second disconnecting switch, and a third disconnecting switch; The first disconnecting switch is connected between the first power supply arm and the first neutral section, the second disconnecting switch is connected between the first neutral section and the second neutral section, and the third disconnecting switch is connected between the second power supply arm and the second neutral section; the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are all in the open state under normal operating conditions.

[0023] In the above embodiments, the arrangement of non-individual anchor sections is adopted. In essence, it consists of four-span insulation joints + three-span insulation joints + four-span insulation joints (i.e., the first insulation joint, the second insulation joint, and the third insulation joint). Compared with the traditional double-break 7-span anchor section joint phase separation, it reduces the anchoring arrangement of the contact wire and causes less interference to the existing line.

[0024] For dual pantographs without high-voltage busbar connection, regardless of the distance between the two pantographs, the sliding plates of the two pantographs cannot simultaneously short-circuit the three breaks. This is a significant advantage of the three-break phase separation type over the two-break phase separation type.

[0025] The 7-span three-break electrical phase-splitting device includes a contact suspension device and a disconnecting switch. The switch leads on both sides of the electric disconnecting switch are respectively connected to the contact suspensions of different anchor sections, and the insulation gap between the two contact suspensions is not less than 500mm.

[0026] Three disconnect switches are installed on the electrical phase separation section. When the train stops in the phase separation area due to an emergency, the traction current can be supplied to the train by the opening and closing of different disconnect switches, so that the train can be pulled out of the phase separation de-energized area, thus meeting the emergency rescue function.

[0027] Figure 1 In the diagram, 1, 2, and 3 represent the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch, respectively. ZJA-ZJF is the overhead contact line cantilever suspension device. The switch leads on both sides of the electric disconnecting switch are connected to the contact suspension of different anchor sections.

[0028] When a train is traveling from ZJA to ZJF and stops in a phase-deprived area for some reason, the train can be rescued by closing the disconnecting switch 2 on the ZJD support and the disconnecting switch 3 on the ZJF support, allowing the train's pantograph to draw power.

[0029] When a train is traveling from ZJF to ZJA and stops in a phase-deprived area for some reason, the train can be rescued by closing the disconnecting switch 2 on the ZJD support and the disconnecting switch 1 on the ZJA support to allow the train's pantograph to draw power.

[0030] Compared with existing technologies, the three-break contact network phase-splitting device provided in this embodiment, through a composite joint structure consisting of a first insulating joint, a second insulating joint, and a third insulating joint, eliminates the need for large-scale alterations to the existing line layout and facility locations, avoiding the dismantling and reconstruction of numerous contact network supports and cables. This reduces construction difficulty and impact on traffic operations, facilitating retrofitting. The modular design allows for factory prefabrication and testing of the insulating joints and disconnecting switches, enabling rapid on-site installation and shortening the construction cycle. In terms of emergency power supply and rescue, the three continuous insulating breaks and two neutral sections provide space for emergency operations. In emergencies, the power supply circuit can be changed by operating the disconnecting switches, enabling power conversion and allocation between different power supply arms to provide emergency power to stranded trains and ensure the safe evacuation of passengers. The independently installed disconnecting switches allow for reliable rescue without power outages. Furthermore, the multiple insulating breaks provide multiple layers of protection against power interference and short-circuit faults between different power supply arms. When a fault occurs in a part of the contact network, the disconnecting switches can quickly isolate the fault area, preventing the fault from spreading and ensuring the stable operation of the entire contact network system.

[0031] In some embodiments of the present invention, the first insulating joint, the second insulating joint, and the third insulating joint share a joint support, such that the total number of spans of the composite joint structure is a preset value, and the air insulation gap of the insulating break is configured to meet the insulation safety requirements of a preset voltage level.

[0032] In the above embodiments, the first, second, and third insulating joints achieve shared use of joint supports through optimized structural design. Specifically, the joints of adjacent insulating joints adopt a shared support scheme, so that the total number of spans of the composite joint structure is constructed to a preset value (in a preferred embodiment, the preset value of the total number of spans is seven spans). This structure significantly reduces the number of support foundations and lowers the engineering complexity while ensuring electrical isolation. In addition, the air insulation gaps at each insulation break are designed to strictly follow the insulation coordination requirements under a preset voltage level (such as 27.5kV or 2×27.5kV), ensuring that reliable insulation strength can be maintained even under maximum operating overvoltage and harsh environmental conditions, meeting the mandatory requirements of railway industry standards for safe air gap distances.

[0033] In some embodiments of the present invention, the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are electrically operated disconnecting switches and are connected to an external remote control system to receive closing and opening commands.

[0034] In the above embodiments, the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are all electrically operated disconnecting switches. Each switch is equipped with an electric operating mechanism and is electrically connected to a remote control system via a control cable. Deployed in a dispatch center or substation, the system can send opening or closing control signals to designated disconnecting switches based on preset logic or manual commands, thereby achieving remote control of the switch status.

[0035] In some embodiments of the present invention, the remote control system is configured to: when a signal is detected or received that a train is stranded in the first neutral section, perform a logical operation to close the second disconnect switch and the third disconnect switch, thereby establishing an emergency power supply circuit from the second power supply arm to the stranded train.

[0036] In the above embodiment, when a signal indicating that a train is stranded in the first neutral section is detected or received by a train position monitoring device (such as a track circuit, axle temperature detector, or wireless communication system) or manually reported by the driver / dispatcher, a pre-stored rescue procedure is triggered, sequentially or simultaneously issuing closing commands to the second and third disconnect switches. After the second disconnect switch closes, the first and second neutral sections are electrically connected; after the third disconnect switch closes, power from the second power supply arm is introduced into the second neutral section. This establishes a complete emergency power supply circuit from the second power supply arm through the second and first neutral sections to the pantograph of the stranded train, providing traction power to enable the train to move autonomously away from the de-energized area.

[0037] In some embodiments of the present invention, the remote control system is configured to: when a signal is detected or received that a train is stranded in the second neutral section, perform a logical operation to close the first disconnect switch and the second disconnect switch, thereby establishing an emergency power supply circuit from the first power supply arm to the stranded train.

[0038] In the above embodiment, once it is confirmed that the train is stranded in the second neutral section, the following operations will be performed: a closing command will be issued to the first disconnecting switch and the second disconnecting switch. The first disconnecting switch will close, allowing power from the first power supply arm to be connected to the first neutral section; the second disconnecting switch will close, thereby diverting power from the first neutral section to the second neutral section. Through the coordinated action of these two switches, an emergency power supply circuit is successfully established from the first power supply arm through the first and second neutral sections to the stranded train, achieving uninterrupted power supply rescue.

[0039] In some embodiments of the present invention, the lengths of the first neutral section and the second neutral section are both greater than the length of the pantograph of a single target EMU, and the sum of the lengths of the first neutral section and the second neutral section is greater than the maximum spacing between the two pantographs of the target EMU.

[0040] In the above embodiments, the independent length of each neutral section is set to be greater than the effective contact length of the pantograph sliding plate of a single target EMU. This ensures that when the pantograph is completely within any neutral section, its sliding plate will not simultaneously touch the energized areas at both ends of that neutral section, thereby avoiding short-circuit arcs during normal passage. Furthermore, the sum of the lengths of the first and second neutral sections is designed to be greater than the maximum possible spacing between the two pantographs of the target EMU. This ensures that, under dual-pantograph operation conditions, regardless of the relative positions of the two pantographs, the front and rear pantographs cannot simultaneously short-circuit all three insulation breaks, fundamentally eliminating the risk of phase-to-phase short circuits and guaranteeing power supply safety.

[0041] According to a second aspect of the present invention, a power supply method for a three-break contact network phase-splitting device is also provided, the three-break contact network phase-splitting device based on any of the above implementations comprising: Determine the section of the train that is stuck in the electrical phase-separating device; If it is determined that the train is stuck in the first neutral section, a closing command is sent to the second disconnect switch and the third disconnect switch to form a power supply circuit from the second power supply arm through the second neutral section and the first neutral section to the train; After confirming that the train has departed, restore the second and third disconnect switches to the open state.

[0042] In the above embodiment, by comprehensively analyzing information from the track circuit, the locomotive integrated wireless communication equipment (CIR), or information actively reported by the driver, it is determined that the specific section of the train stuck in the electrical phase-separating device is the first neutral section. After confirming the stuck situation, the remote control system issues closing commands with operation credentials to the second and third disconnect switches according to preset logic. The closing of the second disconnect switch establishes an electrical connection between the first and second neutral sections, while the closing of the third disconnect switch introduces power from the second power supply arm into the second neutral section. The coordinated action of these two switches together constructs a complete power supply loop: electrical energy flows out from the second power supply arm, passes sequentially through the third disconnect switch, the second neutral section, the second disconnect switch, and the first neutral section, and finally reaches the train's pantograph. The system continuously monitors the train's status, and once the feeder current disappears or a clear signal indicating that the train has departed is received, it immediately issues opening commands to the second and third disconnect switches to restore them to their normal isolation state, completing this emergency power supply operation.

[0043] In some embodiments of the present invention, it further includes: If it is determined that the train is stuck in the second neutral section, a closing command is sent to the first disconnect switch and the second disconnect switch to form a power supply circuit from the first power supply arm through the first neutral section and the second neutral section to the train. After confirming that the train has departed, restore the first and second disconnect switches to the open state.

[0044] In the above embodiment, when it is determined that the train is stuck in the second neutral section, different combinations of switching operations are executed: a closing command is issued to the first disconnecting switch and the second disconnecting switch. The first disconnecting switch closes, establishing an electrical connection between the first power supply arm and the first neutral section; the second disconnecting switch closes, connecting the first neutral section and the second neutral section. This forms a power supply circuit starting from the first power supply arm, passing through the first disconnecting switch, the first neutral section, the second disconnecting switch, the second neutral section, and finally reaching the train's pantograph. This circuit provides traction power from the first power supply arm to the stuck train. Similarly, after confirming that the train has safely left the de-energized area, the first and second disconnecting switches are opened, and the device returns to normal phase-separated electrical operation.

[0045] In some embodiments of the present invention, before issuing a closing command to the disconnecting switch, a logic blocking verification is performed, including: Confirm that the feeder circuit breaker of the target power supply arm is in the closed state; Confirm that the corresponding disconnect switch of the non-target power supply arm is in the open state; The closing command will be executed only if all of the above conditions are met.

[0046] In the above embodiments, to ensure absolute safety of emergency power supply operations and prevent serious consequences such as phase-to-phase short circuits caused by misoperation, a logic interlocking verification procedure must be executed before issuing a closing command to any disconnector. First, it is confirmed that the feeder circuit breaker of the target power supply arm to be supplied with power is in the closed energized state, ensuring the power supply side is available. Second, it is verified that the disconnector corresponding to the non-target power supply arm (for example, when supplying power to the first neutral section, the first disconnector must be verified; when supplying power to the second neutral section, the third disconnector must be verified) is reliably in the open state, ensuring that the non-power supply side is effectively isolated. Only when all verification items are satisfied can the subsequent closing command be executed; otherwise, the operation will be interrupted and an alarm will be issued.

[0047] In some embodiments of the present invention, it further includes: After the power supply circuit is formed, monitor the current value in the power supply circuit; When the current value is detected to be continuously lower than the preset load threshold for a period of time, it is determined that the train has left and an instruction is issued to restore the closed disconnect switch to the open state.

[0048] In the above embodiment, after successfully establishing an emergency power supply circuit, the power supply current is continuously monitored by current transformers installed in the relevant circuit. A current threshold representing no-load or slight load and a necessary duration criterion are preset. When the monitored current value remains below the load threshold and this low current state is stably maintained for more than the set duration (e.g., 30 seconds or 60 seconds), it is determined that the train has successfully left the power-off area and no longer draws current. Subsequently, a tripping command is issued to disconnect all the disconnecting switches previously closed for rescue, allowing the phase-splitting device to promptly return to its normal isolation state without manual intervention, thereby preventing the equipment from being in an abnormal operating mode for a long time.

[0049] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method. The computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, DVDs, CD-ROMs, microdrives, as well as magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0050] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0051] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some service interface; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0053] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0054] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0055] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0056] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0057] The foregoing description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A three-break contact network phase-splitting device, characterized in that, The device consists of a first insulating joint, a second insulating joint, and a third insulating joint connected in sequence to form a composite joint structure. The composite joint structure forms three continuous insulation breaks in the contact wire, as well as a first neutral segment and a second neutral segment separated by them. The device also includes a first disconnect switch, a second disconnect switch, and a third disconnect switch; The first disconnecting switch is connected between the first power supply arm and the first neutral section, the second disconnecting switch is connected between the first neutral section and the second neutral section, and the third disconnecting switch is connected between the second power supply arm and the second neutral section; the first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are all in the open state under normal operating conditions.

2. The three-break contact network phase-splitting device according to claim 1, characterized in that, The first insulating joint, the second insulating joint, and the third insulating joint share a joint support, such that the total number of spans of the composite joint structure is a preset value, and the air insulation gap of the insulating break is constructed to meet the insulation safety requirements of a preset voltage level.

3. The three-break contact network phase-splitting device according to claim 1, characterized in that, The first disconnecting switch, the second disconnecting switch, and the third disconnecting switch are electrically operated disconnecting switches and are connected to an external remote control system to receive closing and opening commands.

4. The three-break contact network phase-splitting device according to claim 3, characterized in that, The remote control system is configured to: when a signal is detected or received that a train is stuck in the first neutral section, execute the logical operation of closing the second disconnect switch and the third disconnect switch to establish an emergency power supply circuit from the second power supply arm to the stuck train.

5. The three-break contact network phase-splitting device according to claim 3, characterized in that, The remote control system is configured to: when a signal is detected or received that a train is stuck in the second neutral section, execute the logical operation of closing the first disconnect switch and the second disconnect switch to establish an emergency power supply circuit from the first power supply arm to the stuck train.

6. The three-break contact network phase-splitting device according to claim 1, characterized in that, The lengths of both the first neutral section and the second neutral section are greater than the length of the pantograph of a single target EMU, and the sum of the lengths of the first neutral section and the second neutral section is greater than the maximum spacing between the two pantographs of the target EMU.

7. A power supply method for a three-break contact network phase-splitting device, based on the three-break contact network phase-splitting device as described in any one of claims 1-6, characterized in that, include: Determine the section of the train that is stuck in the electrical phase-separating device; If it is determined that the train is stuck in the first neutral section, a closing command is sent to the second disconnect switch and the third disconnect switch to form a power supply circuit from the second power supply arm through the second neutral section and the first neutral section to the train; After confirming that the train has departed, restore the second and third disconnect switches to the open state.

8. The emergency power supply method according to claim 7, characterized in that, Also includes: If it is determined that the train is stuck in the second neutral section, a closing command is sent to the first disconnect switch and the second disconnect switch to form a power supply circuit from the first power supply arm through the first neutral section and the second neutral section to the train. After confirming that the train has departed, restore the first and second disconnect switches to the open state.

9. The emergency power supply method according to claim 7, characterized in that, Before issuing a closing command to the disconnector switch, a logic interlocking check is performed, including: Confirm that the feeder circuit breaker of the target power supply arm is in the closed state; Confirm that the corresponding disconnect switch of the non-target power supply arm is in the open state; The closing command is executed only when all of the above conditions are met.

10. The emergency power supply method according to claim 7, characterized in that, Also includes: After the power supply circuit is formed, the current value in the power supply circuit is monitored; When the current value is detected to be continuously lower than the preset load threshold for a period of time, it is determined that the train has departed, and an instruction is issued to restore the closed disconnect switch to the open state.

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