Rectification switch cabinet, subway rectification switch cabinet direct current system and device

Abstract

The utility model provides a rectification switch cabinet, a subway rectification switch cabinet direct current system and a subway rectification switch cabinet direct current device, which form a closed loop with a traction substation and a steel rail, and is characterized by comprising a bipolar isolation switch and a rectification module, the rectification module is connected with a positive bus and a negative bus of a traction substation through a bipolar isolation switch. The output end positive electrode of the bipolar isolation switch is connected with the wire inlet end of the direct-current feeder cabinet, and the negative electrode is connected with a steel rail; the input end of the rectification module is connected with the rectification transformer, the output end of the rectification module is connected with the input end of the bipolar isolation switch, and the scattered and independent equipment subway rectifiers, the positive pole cabinet and the negative pole cabinet are integrated and subjected to function recombination, so that the number of equipment is reduced, and the construction occupied area is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of subway traction DC power supply systems, and more specifically, to a rectifier switch cabinet, a subway rectifier switch cabinet DC system and a device. Background Art

[0002] Subway rectifier switchgear is a key component of the metro DC power supply system. Its function is to convert AC power into DC power, distribute it, and control it to ensure the stable operation of subway trains. Subway rectifier switchgear typically uses rectifier transformers and rectifiers to convert 35kV AC power into 1500V DC power for use by subway trains. The converted DC power is distributed to the catenary or contact rails via feeder cabinets, providing power for the subway trains. Furthermore, it is equipped with comprehensive protection and control devices to control, monitor, measure, and protect the power supply system, ensuring safe operation.

[0003] Conventional subway DC systems typically include a rectifier, incoming line cabinet, feeder cabinet, cathode cabinet, and terminal cabinet. The incoming line cabinet also contains a positive disconnector, and the cathode cabinet contains two negative disconnectors. While this solution can achieve the rectification and distribution functions of the subway DC power supply, its drawbacks include a long topology and a large floor space, which significantly increases construction costs for underground construction. The presence of four disconnectors complicates the operational process. Furthermore, the existing cabinet configuration is not suitable for traction stations with limited available floor space. Utility Model Content

[0004] To solve the problem of the large number of cabinets and large floor space in the current subway rectifier system, the utility model proposes a rectifier switch cabinet, a subway rectifier switch cabinet DC system and a device, which integrate the scattered and independent equipment in the conventional DC system and reorganize their functions, thereby reducing the number of equipment and the construction area.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0006] A rectifier switch cabinet forms a closed loop with a traction substation and rails, comprising: a bipolar disconnector and a rectifier module; the rectifier module is connected to the positive busbar and negative busbar of the traction substation via the bipolar disconnector; the positive output terminal of the bipolar disconnector is connected to the incoming terminal of a DC feeder cabinet, and the negative output terminal is connected to the rails; the input terminals of the rectifier module are respectively connected to rectifier transformers, and the output terminals of the rectifier module are connected to the input terminals of the bipolar disconnector.

[0007] Here, the rectifier switchgear integrates and functionally reorganizes the scattered and independent equipment in the conventional DC system, not only retaining the rectification function of the rectifier, but also retaining the relevant functions of the rectifier, incoming line cabinet, and negative pole cabinet after integration and functional reorganization, including the positive pole cabinet (incoming line cabinet) connecting the positive pole of the rectifier valve side with the positive pole bus, collecting signals to realize the opening and closing function of the isolating switch, and the negative pole cabinet connecting the negative pole of the rectifier valve side with the return rail, frame protection, and negative pole opening and closing function; in addition, a bipolar isolating switch is used to replace the two single-pole switches in the original incoming line cabinet and negative pole cabinet, simplifying the maintenance process.

[0008] Preferably, the rectifier module is a diode rectifier module.

[0009] Here, the diode rectifier module realizes the rectification of AC power by utilizing the characteristic that the PN junction only allows one-way conduction when it breaks down in the reverse direction. By installing the diode forward and reverse according to the polarity of the diode, the rectification function can be realized and the positive and negative poles of DC output can be output.

[0010] A subway rectifier switch cabinet DC system comprises four feeder cabinets and two rectifier switch cabinets as described above, wherein input ends of the four feeder cabinets are respectively connected to positive busbars.

[0011] Preferably, the two rectifier switch cabinets are connected in parallel with four adjacent feeder cabinets on the left and right.

[0012] Preferably, the rectifier switch cabinet and the feeder cabinet are connected by cables to achieve main circuit connectivity.

[0013] Preferably, the rectifier switch cabinet and feeder cabinet are connected by inter-cabinet busbars to achieve main circuit interconnection.

[0014] Here, by combining the cabinets, the number of incoming cabinets and cables connected to the incoming cabinets in the conventional solution is reduced. Compared with the conventional non-combined cabinet arrangement solution, this embodiment reduces the length of cables between cabinets and saves construction costs.

[0015] Preferably, the subway rectifier switch cabinet DC system further includes a terminal cabinet, wherein the terminal cabinet is provided with connection terminals, and the terminal cabinet is electrically connected to the rectifier switch cabinet and the feeder cabinet through the connection terminals.

[0016] Here, the terminal cabinet provides a centralized connection point for connecting various electrical devices, and these devices are interconnected through copper bars or cables to form a closed circuit.

[0017] Preferably, a secondary control device is provided in the terminal cabinet, and the secondary control device is signal-connected or electrically connected to the rectifier switch cabinet and the feeder cabinet.

[0018] Here, by setting up terminal cabinets, maintenance personnel can easily access and maintain electrical connections, thereby ensuring the reliability and safety of the power supply system.

[0019] Preferably, each feeder cabinet is provided with an isolating switch, which not only provides an obvious disconnection point to ensure that the relevant parts are completely isolated from the power supply when the feeder cabinet is maintained or overhauled, thereby avoiding the safety risks caused by accidental power-on, but also when a part of the feeder cabinet fails, the isolating switch can quickly cut off the faulty part to prevent the fault from spreading to other parts, thereby protecting the stable operation of the entire system, further ensuring the safe operation of the power system, facilitating maintenance and overhaul, and improving the flexibility and reliability of the system.

[0020] A subway rectifier switch device comprises a cabinet and the above-mentioned subway rectifier switch cabinet DC system; the subway rectifier switch cabinet DC system is arranged inside the cabinet.

[0021] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0022] The utility model provides a rectifier switch cabinet, a subway rectifier switch cabinet DC system and a device, comprising a bipolar disconnector, a rectifier module and a rectifier transformer; the input end of the bipolar disconnector is connected to the positive busbar and the negative busbar of the rectifier module, the positive pole of the output end of the bipolar disconnector is connected to the incoming end of the DC feeder cabinet, and the negative pole is connected to the rail; the input end of the rectifier module is respectively connected to the traction transformer, and the output end of the rectifier module is connected to the input end of the disconnector. The scattered and independent equipment is integrated and functionally reorganized, thereby reducing the number of equipment, reducing the construction area, and simplifying the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The structure diagram of the rectifier switch cabinet proposed in the embodiment of the present utility model is shown;

[0024] Figure 2 A schematic diagram showing the layout of a rectifier switch cabinet proposed in an embodiment of the present utility model;

[0025] Figure 3 A schematic diagram showing the press-fitting of the rectifier module proposed in an embodiment of the present invention;

[0026] Figure 4 A topological diagram of a conventional DC system proposed in an embodiment of the present utility model is shown;

[0027] Figure 5 It shows the configuration diagram of the DC system of the subway rectifier switch cabinet proposed in the embodiment of the present utility model;

[0028] Figure 6 The topology diagram of the DC system of the subway rectifier switch cabinet proposed in the embodiment of the present utility model is shown;

[0029] In the figure: 1. Rectifier switch cabinet; 11. Bipolar disconnect switch; 12. Rectifier module; 2. Feeder cabinet; 3. Terminal cabinet. DETAILED DESCRIPTION

[0030] The accompanying drawings are for illustrative purposes only and are not to be construed as limiting this patent;

[0031] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent actual sizes. The description of the directions of parts such as "upper" and "lower" does not limit this patent;

[0032] It is understandable to those skilled in the art that descriptions of certain well-known contents may be omitted in the drawings.

[0033] The technical solution of the present utility model is further described below with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides a rectifier switch cabinet 1, which forms a closed loop with the traction substation and the rails, and includes: a bipolar disconnector 11 and a rectifier module 12; the rectifier module 12 is connected to the positive busbar and the negative busbar of the traction substation through the bipolar disconnector 11; the positive output terminal of the bipolar disconnector 11 is connected to the incoming terminal of the DC feeder cabinet, and the negative output terminal is connected to the rails; the input terminals of the rectifier module 12 are respectively connected to the rectifier transformers, and the output terminal of the rectifier module 12 is connected to the input terminal of the bipolar disconnector 11.

[0036] The layout of rectifier switch cabinet 1 is as follows Figure 2 As shown, the rectifier switch cabinet 1 integrates the rectifier module 12 and the bipolar isolating switch 11, meeting functional requirements and electrical design specifications. After integration and functional reorganization, the rectifier switch cabinet 1 in this embodiment has the rectifier's AC1180V to DC1500V rectification function, the positive cabinet (incoming cabinet) connects the rectifier valve-side positive pole with the DC1500V positive busbar and collects signals to realize the isolating switch opening and closing function, and the negative cabinet connects the rectifier valve-side negative pole with the return rail, provides frame protection, and has negative pole opening and closing functions.

[0037] Here, this embodiment integrates the scattered and independent equipment and reorganizes their functions, thereby reducing the number of equipment and the construction area.

[0038] In this embodiment, the rectifier module 12 is a diode rectifier module. In the subway DC system circuit, since the voltage direction is constantly changing, it needs to be converted into DC power for normal use. The diode rectifier module realizes the rectification of AC power by utilizing the characteristic that the PN junction only allows one-way conduction when it breaks down in reverse. Figure 3 As shown, during the application process, the diode can be installed in reverse according to its polarity to achieve the rectification function and output the positive and negative poles of DC.

[0039] The rectifier switch cabinet 1 of this embodiment uses a bipolar isolating switch 11 to replace the two single-pole switches in the original incoming line cabinet and the negative pole cabinet. The beneficial effects include the following aspects:

[0040] (1) Improved safety: Bipolar isolating switches can cut off two circuits at the same time, ensuring that the circuit is completely de-energized during maintenance, thereby reducing the risk of electric shock. In addition, since bipolar switches need to operate two conductive paths at the same time, operators are more likely to be aware of the power status during use, thereby reducing the possibility of misoperation.

[0041] (2) Convenient maintenance and repair: The bipolar isolating switch provides a clear disconnection point, which makes it easy for maintenance personnel to identify and confirm the circuit status to ensure safety; since the bipolar switch can cut off multiple power supplies at the same time, the operation steps can be reduced during maintenance, improving efficiency;

[0042] (3) Optimize cost-effectiveness: Using a double-pole disconnector can reduce the amount of equipment that needs to be installed, thereby reducing overall installation and maintenance costs. In addition, although the initial cost of a double-pole disconnector may be higher than that of a single-pole switch, its improved safety and reliability can reduce long-term maintenance costs and potential accident costs.

[0043] Example 2

[0044] like Figure 4 As shown in the figure, a conventional subway DC system usually includes: two rectifiers, two incoming line cabinets, four feeder cabinets, one negative pole cabinet, and one terminal cabinet. The incoming line cabinet contains one positive pole disconnector, and the negative pole cabinet contains two negative pole disconnectors. The biggest disadvantage of this solution is the long configuration topology and the large floor space required, which incurs a huge construction cost for underground construction. In terms of operation, there are a total of four disconnectors. In addition, this configuration is not suitable for traction stations with small available floor space.

[0045] In this embodiment, a subway rectifier switch cabinet DC system is proposed, such as Figure 5 As shown, it includes four feeder cabinets 2 and two rectifier switch cabinets 1 as described above, and the input ends of the four feeder cabinets 2 are respectively connected to the positive busbar.

[0046] The feeder cabinet 2 includes feeder cabinet No. 1, feeder cabinet No. 2, feeder cabinet No. 3 and feeder cabinet No. 4, and the rectifier switch cabinet includes rectifier switch cabinet No. 1 and rectifier switch cabinet No. 2. In this embodiment, Figure 6 As shown, feeder cabinet No. 1, feeder cabinet No. 3, rectifier switch cabinet No. 1, rectifier switch cabinet No. 2, feeder cabinet No. 2 and feeder cabinet No. 4 are arranged in sequence. The two rectifier switch cabinets 1 are connected in parallel with the four feeder cabinets 2 adjacent to the left and right. The rectifier switch cabinets 1 and feeder cabinets 2 are connected by inter-cabinet busbars, or can be connected by cables to achieve main circuit connectivity.

[0047] Here, by combining the cabinets, the number of incoming cabinets and cables connected to the incoming cabinets in the conventional solution is reduced. Compared with the conventional non-combined cabinet arrangement solution, this embodiment reduces the length of cables between cabinets and saves construction costs.

[0048] Furthermore, if Figure 5 and Figure 6 As shown, the subway rectifier switchgear DC system also includes a terminal cabinet 3, which is primarily responsible for electrical connections and signal transmission and is a key component for ensuring the stable operation of the subway power supply system. Terminal cabinet 3 provides a centralized connection point for various electrical equipment, such as transformers, rectifiers, circuit breakers, and disconnectors. It interconnects these devices via copper busbars or cables, forming a closed circuit. Terminal cabinet 3 is also responsible for transmitting control and protection signals. It houses various relays, contactors, and control components that receive commands from the control center and provide feedback on device status. The design of terminal cabinet 3 allows maintenance personnel to easily access and maintain electrical connections, thereby ensuring the reliability and safety of the power supply system.

[0049] In this embodiment, the terminal cabinet 3 is equipped with wiring terminals, which are electrically connected to the rectifier switch cabinet 1 and the feeder cabinet 2. The terminal cabinet 3 also houses secondary control devices, which provide signal or electrical connections to the rectifier switch cabinet 1 and the feeder cabinet 2, ensuring the efficient operation of the subway rectifier switch cabinet system.

[0050] In this embodiment, each feeder cabinet 2 is provided with an isolating switch, and its functions include: the isolating switch can provide a clear disconnection point to ensure that the relevant parts are completely isolated from the power supply when the feeder cabinet 2 is maintained or repaired, thereby avoiding the safety risks caused by accidental power-on; the isolating switch can quickly cut off part of a specific circuit, so that maintenance personnel can safely perform maintenance and repair work without affecting other parts; the isolating switch allows specific parts in the feeder cabinet 2 to be operated without cutting off the power supply of the entire system, thereby improving the flexibility and operability of the system; when a part of the feeder cabinet 2 fails, the isolating switch can quickly cut off the faulty part to prevent the fault from spreading to other parts, thereby protecting the stable operation of the entire system.

[0051] Compared with the conventional DC system configuration, the subway rectifier switch cabinet DC system proposed in this embodiment reduces the number of traction DC system equipment and can effectively reduce the installation space of the traction station by about 27mm. 2 .

[0052] Example 3

[0053] This embodiment provides a subway rectifier switch device, including a cabinet body and the subway rectifier switch cabinet DC system as described above;

[0054] The subway rectifier switchgear DC system includes four feeder cabinets 2, two rectifier switchgear cabinets 1 as described above, and one terminal cabinet 3. The input terminals of the four feeder cabinets 2 are respectively connected to the positive busbar. The two rectifier switchgear cabinets 1 are paralleled with the four adjacent feeder cabinets 2 on the left and right. The rectifier switchgear cabinets 1 and feeder cabinets 2 are connected using inter-cabinet busbars or cables to achieve main circuit interconnection. The terminal cabinet 3 is equipped with wiring terminals, which are electrically connected to the rectifier switchgear cabinets 1 and feeder cabinets 2 through the wiring terminals. The terminal cabinet 3 also houses secondary control devices, which are signal-connected or electrically connected to the rectifier switchgear cabinets 1 and feeder cabinets 2, ensuring the efficient operation of the subway rectifier switchgear system. The rectifier switch cabinet 1 includes a bipolar disconnector 11 and a rectifier module 12. The input of the bipolar disconnector 11 is connected to the positive and negative busbars of the rectifier module 12. The positive output of the bipolar disconnector 11 is connected to the DC feeder cabinet input terminal, and the negative output is connected to the rails. The input of the rectifier module 12 is connected to a rectifier transformer, and the output of the rectifier module 12 is connected to the input of the bipolar disconnector 11. The DC system of the subway rectifier switch cabinet is installed inside the cabinet.

[0055] The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A rectifier switchgear, forming a closed loop with a traction substation and rails, characterized in that: include: A bipolar disconnector and a rectifier module; the rectifier module is connected to the positive busbar and negative busbar of the traction substation through the bipolar disconnector; the positive pole of the output end of the bipolar disconnector is connected to the incoming line end of the DC feeder cabinet, and the negative pole is connected to the rail; the input ends of the rectifier module are respectively connected to the rectifier transformers, and the output end of the rectifier module is connected to the input end of the bipolar disconnector.

2. The rectifier switch cabinet according to claim 1, characterized in that: The rectifier module adopts a diode rectifier module.

3. A subway rectifier switchgear DC system, comprising four feeder cabinets and two rectifier switchgears according to claim 1 or 2, characterized in that: The input ends of the four feeder cabinets are respectively connected to the positive busbar.

4. The subway rectifier switch cabinet DC system according to claim 3, characterized in that: The two rectifier switch cabinets are connected in parallel with the four feeder cabinets adjacent to the left and right.

5. The subway rectifier switch cabinet DC system according to claim 4, characterized in that: The rectifier switch cabinet and feeder cabinet are connected by inter-cabinet busbars.

6. The subway rectifier switch cabinet DC system according to claim 4, characterized in that: The rectifier switch cabinet and the feeder cabinet are connected by cables.

7. The subway rectifier switch cabinet DC system according to claim 3, characterized in that: It also includes a terminal cabinet, which is provided with wiring terminals. The terminal cabinet is electrically connected to the rectifier switch cabinet and the feeder cabinet through the wiring terminals.

8. The subway rectifier switch cabinet DC system according to claim 7, characterized in that: The terminal cabinet is provided with a secondary control device, which is signal-connected or electrically connected to the rectifier switch cabinet and the feeder cabinet.

9. The subway rectifier switch cabinet DC system according to claim 3, characterized in that: Each feeder cabinet is provided with an isolating switch.

10. A subway rectifier switch device, characterized in that: It comprises a cabinet body and a subway rectifier switch cabinet DC system according to any one of claims 3 to 9; the subway rectifier switch cabinet DC system is arranged inside the cabinet body.

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