Overhead low-voltage incoming line distribution cabinet for railway box transformer

Abstract

The utility model relates to a top-mounted low-voltage incoming line distribution cabinet for railway box transformer, the distribution cabinet main part is composed of the cabin and the cabinet frame, is installed in the upper side of transformer, the cabin and the main framework of frame all are assembled from standard C section bar, the both sides crossbeam of cabin top is equipped with the hanger wheel, the both sides of cabinet frame are equipped with the busbar frame, the busbar frame height is located transformer low-voltage wiring end upper side, the busbar frame is equipped with transformer busbar, transformer low-voltage wiring end is connected in busbar first, and the lower mouth of busbar and isolation switch is connected through the soft connection. The utility model distribution cabinet can be installed in transformer room, makes full use of transformer room upper empty space, and the low-voltage primary main incoming line element originally located in low-voltage cabinet is installed in this distribution cabinet, saves the space in low-voltage cabinet for placing more outgoing line loop, thereby reduces the required outgoing line cabinet quantity, further compresses the volume of box transformer, and simultaneously facilitates transportation and in position.

Description

Technical Field

[0001] This utility model relates to the technical field of low-voltage distribution cabinets for prefabricated substations, and in particular to top-mounted low-voltage incoming distribution cabinets for railway prefabricated substations. Background Technology

[0002] A prefabricated substation, also known as a prefabricated transformer substation, is a factory-prefabricated, compact indoor / outdoor power distribution unit that integrates high-voltage switchgear, distribution transformers, and low-voltage power distribution equipment according to a specific wiring scheme. It organically combines transformer voltage reduction and low-voltage power distribution functions, all housed in a moisture-proof, rust-proof, dust-proof, rodent-proof, fire-proof, theft-proof, heat-insulated, fully enclosed, and movable steel structure box. It is particularly suitable for urban power grid construction and renovation, and represents a new type of substation that has emerged after traditional civil engineering substations. Prefabricated substations are suitable for mines, factories, oil and gas fields, and wind power stations, replacing traditional civil engineering substations and becoming a new type of complete power distribution system.

[0003] As the power hub of the railway communication and signaling system, railway transformer substations play a crucial role in the safe operation of the railway system. Railways often pass through densely populated areas such as towns, making land acquisition during construction extremely difficult; therefore, the smaller the footprint of related supporting facilities, the better. Furthermore, due to the unique nature of railway construction, basic facilities like transformer substations are typically required to be in place and operational before the on-site transportation system begins. Therefore, excessively large equipment sizes would inevitably pose significant challenges to on-site transportation and placement. In conclusion, making full use of the internal space of the transformer substation and reducing its size can bring substantial benefits and convenience to related construction work. Utility Model Content

[0004] The purpose of this invention is to provide a top-mounted low-voltage incoming line distribution cabinet for railway prefabricated substations. This distribution cabinet can be installed in the transformer room, making full use of the upper space of the transformer room. The low-voltage primary main incoming line components that were originally located in the low-voltage cabinet can be installed in this distribution cabinet, saving space in the low-voltage cabinet to accommodate more outgoing circuits, thereby reducing the number of outgoing cabinets required, further compressing the size of the prefabricated substation, reducing costs, reducing the footprint, and facilitating transportation and placement.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The railway box-type low-voltage incoming distribution cabinet is composed of a pod and a cabinet frame, and is installed above the transformer; the pod and the main frame are assembled from standard C-shaped profiles. The top two crossbeams of the pod are equipped with hanging wheels, which are used to suspend the pod onto the top crossbeam of the cabinet frame. The bottom two crossbeams of the pod are equipped with limit frames for limiting and guiding the pod when it is pulled out. The front space of the pod is divided into a component room by a partition, which contains isolating knife switches and circuit breakers. The rear space of the pod is a busbar room, which serves as the wiring space for the low-voltage primary busbar. Corresponding to the busbar specifications of different capacity transformers, busbar frames of corresponding specifications are installed on the internal crossbeams for primary busbar wiring.

[0006] The cabinet frame is equipped with busbar frames on both sides. The height of the busbar frames is above the low-voltage terminals of the transformer. The busbar frames are equipped with transformer busbars. The low-voltage terminals of the transformer are first connected to the busbars. The busbars are connected to the lower end of the isolating switch through a flexible connection to ensure that the upper pod can be pulled out for maintenance.

[0007] Furthermore, the distribution cabinet is installed in the transformer room, and the pod is located on top of the transformer. The entire pod can be pulled out.

[0008] Furthermore, the busbar frame is mounted on the frame and positioned above the transformer to secure the busbar.

[0009] Furthermore, the top beam of the pod is equipped with wheels, and the bottom beam is equipped with a limit bracket.

[0010] Furthermore, the pulley is attached to the top crossbeam of the frame, and the limit bracket hooks onto the middle crossbeam of the frame.

[0011] Furthermore, the interior of the pod is divided into a component room and a busbar room by a partition. The component room is used to install primary components, and the busbar room is used for primary busbar cabling.

[0012] Compared with existing technologies, the outstanding advantages of this utility model of a top-mounted, removable low-voltage main incoming line distribution cabinet for railway prefabricated substations are: (1) The distribution cabinet of this utility model is installed in the transformer room, making full use of the space in the transformer room and saving the space inside the low-voltage cabinet, so that the low-voltage cabinet can accommodate more outgoing circuits, reduce the number of low-voltage cabinets, and reduce the size of the transformer box. At the same time, the original method of the incoming copper busbar entering from the top of the low-voltage cabinet, passing through the incoming knife switch, circuit breaker, etc. to the bottom of the cabinet, and then flipping to the busbar on the top of the cabinet, is changed to the method of the incoming line entering from the middle of the low-voltage cabinet directly to the busbar on the top of the cabinet, which greatly reduces the amount of copper busbar used.

[0013] (2) The top pod of this utility model is designed to be retractable, which solves the problem of the distribution cabinet being inconvenient to maintain when installed in the transformer room. The busbar connection between the pod and the transformer and the low-voltage cabinet below is a flexible connection to avoid interference when it is pulled out. In extreme cases, the pod limit frame can be removed to pull the entire pod out for maintenance or replacement.

[0014] The following description, in conjunction with the accompanying drawings and specific examples, illustrates the top-mounted low-voltage incoming power distribution cabinet for railway transformer substations according to this utility model. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the top-mounted low-voltage incoming power distribution cabinet and transformer for railway box-type substations according to this utility model.

[0016] Figure 2 This is a schematic diagram of the internal layout of low-voltage incoming line components in a conventional railway box-type substation within a low-voltage cabinet.

[0017] Figure 3 This is a schematic diagram of the internal layout of a railway box-type substation after applying this utility model.

[0018] Figure 4 This is a side view of the pod of this utility model in normal use and when it is withdrawn.

[0019] Figure 5 This is a schematic diagram of the pod portion of this utility model.

[0020] Figure 6 This is a schematic diagram of the frame structure of this utility model.

[0021] Among them, 1-pod; 2-frame; 3-transformer; 11-Pod frame, 12-Limit frame, 13-Roller, 14-Busbar frame, 15-Low voltage primary busbar, 16-Block, 17-Isolating knife switch, 18-Circuit breaker, 21-Frame frame, 22-Busbar, 23-Busbar frame. Detailed Implementation

[0022] like Figure 1-3 As shown, the top-mounted low-voltage incoming distribution cabinet for railway transformer substation consists of a pod 1 and a cabinet frame 2, and is installed above the transformer 3; the main skeletons 11 and 21 of the pod 1 and the cabinet frame 2 are all assembled from standard C-shaped profiles.

[0023] The top two crossbeams of the pod 1 are equipped with hanging wheels 13, which are used to suspend the pod 1 onto the top crossbeam of the cabinet frame 2. The bottom two crossbeams of the pod 1 are equipped with limit brackets 12 for limiting and guiding the pod 1 when it is pulled out. The front space of the pod 1 is divided into a component room by a partition 16, which contains primary components such as isolating knife switches 17 and circuit breakers 18. The rear space of the pod 1 is a busbar room, which serves as the wiring space for the low-voltage primary line 15. Corresponding to the busbar specifications of different capacity transformers, busbar frames 14 of corresponding specifications are installed on the internal crossbeams for primary busbar wiring.

[0024] Busbar frames 23 are installed on both sides of the cabinet frame 2, and are located above the low-voltage terminals of the transformer. The busbar frames 23 are equipped with transformer busbars 22. The low-voltage terminals of the transformer are first connected to the busbars 22. The busbars 22 are connected to the lower end of the isolating switch 17 through a flexible connection to ensure that the upper pod can be pulled out for maintenance.

[0025] Furthermore, the distribution cabinet is installed in the transformer room, and the pod 1 is located on top of the transformer. The entire pod 1 can be pulled out.

[0026] Furthermore, the busbar frame 23 is mounted on the frame 2 and positioned above the transformer to fix the busbar 22.

[0027] Furthermore, the top crossbeam of the pod is equipped with a pulley 13, and the bottom crossbeam is equipped with a limit bracket 12.

[0028] Furthermore, the pulley 13 is hung on the top crossbeam of the frame 2, and the limiting bracket 12 is hooked onto the middle crossbeam of the frame 2.

[0029] Furthermore, the interior of the pod 1 is divided into a component room and a busbar room by a partition 16. The component room is used to install primary components, and the busbar room is used for primary busbar wiring.

[0030] The power transmission path and electrical connection principle of this utility model are as follows: (1) Power input from transformer to distribution cabinet: The low-voltage terminal of transformer 3 is first connected to the transformer busbar 22 on both sides of the cabinet frame 2. The busbar is fixed above the transformer by the busbar frame 23 to form a stable power input terminal. The busbar is connected to the lower end of the isolating knife switch 17 in the pod 1 through a flexible connection. The flexible design of the flexible connection allows the pod to be pulled out without damaging the electrical connection, while ensuring the flexibility of mechanical movement.

[0031] (2) Power control and distribution in the pod: Isolation and protection: After the power enters the component room of the pod 1 through the flexible connection, it first passes through the isolating knife switch 17 (providing a clear electrical disconnect point for maintenance safety), and then flows through the circuit breaker 18 (to realize overload, short circuit and other fault protection).

[0032] Busbar Distribution: After being controlled by the switchgear, power enters the busbar compartment at the rear of the pod and connects to the busbar frame 14 via the low-voltage primary line 15. The busbar frame is equipped with different specifications of busbars according to the transformer capacity to ensure that the current carrying capacity matches the system requirements, and finally distributes the power to the subsequent low-voltage load circuits.

[0033] The hoisting and extraction mechanism of this utility model's pod: The pod 1 is suspended from the top crossbeam of the cabinet frame 2 via top hanging wheels 13, and the bottom limiting bracket 12 hooks onto the middle crossbeam of the frame, forming a "suspension + guidance" structure. When maintenance is required, the pod can be extracted along the limiting bracket. At this time, the flexible connection allows the pod to maintain electrical connection with the busbar (if complete power disconnection is required, the isolating switch and circuit breaker must be disconnected first), or it can be completely separated after power disconnection, achieving safe maintenance. The guiding function of the limiting bracket 12 ensures stable trajectory when the pod is extracted, avoiding damage to the busbar or components due to mechanical displacement.

[0034] The separate design of the pod 1 and the cabinet frame 2 in this utility model allows the primary components (isolating knife switches, circuit breakers) and the bus system to be extracted along with the pod as a whole, without the need to disassemble the transformer or perform complex wiring, which greatly shortens the maintenance time and improves the system reliability.

[0035] The electrical safety mechanism of this utility model: the "visible break" characteristic of the isolating knife switch 17 ensures safe maintenance. Clear electrical isolation is established to prevent accidental closing; circuit breaker 18 monitors the current in real time and quickly disconnects the circuit in case of a fault to protect the transformer and load. Physical isolation between the busbar compartment and the component compartment (through partition 16) prevents mutual interference between busbar discharge or component faults, improving system safety.

[0036] The busbar frames 14 and 23 of this utility model can adjust the busbar specifications (such as cross-sectional dimensions and materials) according to the transformer capacity to ensure that the busbar current carrying capacity matches the transformer output and avoid overload heating. At the same time, the fixing function of the busbar frame can reduce electromagnetic vibration when a large current flows through it, ensuring connection stability.

[0037] During normal operation of this utility model: transformer low-voltage side current → busbar 22 → flexible connection → isolating knife switch 17 → circuit breaker 18 → busbar compartment busbar frame 14 → low-voltage load circuit.

[0038] During maintenance of this utility model: disconnect the circuit breaker 18 → pull open the isolating switch 17 → pull along the limit frame Remove pod 1 → Perform component maintenance or busbar repair → Reset pod and close circuit breaker.

[0039] This utility model achieves a balance between power transmission, safety control, and ease of maintenance through a structure of "top-mounted hoisting + flexible connection + modular extraction," making it particularly suitable for the compact space layout and high reliability requirements of railway prefabricated substations.

[0040] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A top-mounted low-voltage incoming power distribution cabinet for railway transformer substations, characterized in that: The main body of the distribution cabinet consists of a pod (1) and a cabinet frame (2), which is installed above the transformer (3). The main skeleton (11) and (21) of the pod (1) and the frame (2) are all assembled from standard C-shaped profiles. The top two side beams of the pod (1) are equipped with hanging wheels (13), which are used to hoist the pod (1) onto the top beam of the cabinet frame (2). The bottom two side beams of the pod (1) are equipped with limit frames (12). The front space of the pod (1) is divided into a component room by a partition (16). The component room is equipped with a disconnecting knife switch (17) and a circuit breaker (18). The rear space of the pod (1) is a busbar room, which serves as the wiring space for the low-voltage primary busbar (15). The corresponding specification busbar frame (14) is installed on the internal beam for the primary busbar wiring. The cabinet frame (2) is equipped with busbar frames (14) on both sides. The height of the busbar frames (14) is above the low-voltage terminals of the transformer. The busbar frames (14) are equipped with busbars (22). The low-voltage terminals of the transformer are first connected to the busbars (22). The busbars (22) are connected to the lower end of the isolating knife switch (17) through a flexible connection.

2. The top-mounted low-voltage incoming power distribution cabinet for railway substations according to claim 1, characterized in that: The distribution cabinet is installed in the transformer room, and the pod (1) is located on the top of the transformer. The pod (1) can be pulled out as a whole.

3. The top-mounted low-voltage incoming power distribution cabinet for railway substations according to claim 1, characterized in that: The busbar frame (14) is mounted on the frame (2) and positioned above the transformer to fix the busbar (22).

4. The top-mounted low-voltage incoming distribution cabinet for railway prefabricated substations according to claim 1, characterized in that: The top beam of the pod is equipped with wheels (13), and the bottom beam is equipped with a limit frame (12).

5. The top-mounted low-voltage incoming power distribution cabinet for railway substations according to claim 4, characterized in that: The hanging wheel (13) is hung on the top crossbeam of the frame (2), and the limiting bracket (12) hooks onto the middle crossbeam of the frame (2).

6. The top-mounted low-voltage incoming power distribution cabinet for railway substations according to claim 2, characterized in that: The pod (1) is divided into a component room and a busbar room by a partition (16). The component room is used to install primary components, and the busbar room is used for primary busbar wiring.

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