Maintenance power box

Abstract

The utility model provides a maintenance power box which is used for quick access and distribution of a three-phase power supply. The power box comprises a main circuit breaker, a plurality of branch circuit breakers and a quick wire plugging and wiring device, and can be connected with an external three-phase power supply efficiently and safely. Through the combination of the crimping terminal and the metal sheet, the stable fixation of the wire and the reliable transmission of the current are ensured. The three-phase power output of each branch circuit breaker is connected to the rapid wire plugging and wiring device, a user can insert a wire between the U-shaped clamping pieces, the wire is clamped through the elastic effect of the clamping pieces, and power supply connection is completed rapidly. The device is further provided with an insulation separation structure, interphase short circuit is effectively prevented, and electrical safety is ensured. The modular design is adopted, maintenance and operation are convenient, the device is particularly suitable for regular maintenance of power equipment, emergency repair of power failures and temporary power supply scenes, and the working efficiency and safety are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of power maintenance equipment technology, and in particular to a maintenance power supply box. Background Technology

[0002] In power systems, maintenance is a crucial step in ensuring the normal operation of equipment. During maintenance, temporary power supply is often required for electrical equipment. Currently, the power connection methods in maintenance power boxes used on-site mainly rely on socket insertion (220V power) and traditional terminal block crimping (380V high-current power). However, the traditional terminal block crimping connection method has many problems, especially when repairing large equipment (such as oil filters, air dryers, or SF6 recovery units). The wiring process is cumbersome and time-consuming, increasing the workload of operators and posing safety hazards. During the connection process, personnel need to directly contact the connecting conductors and use wrenches to crimp and tighten the connection surfaces with bolts, which not only increases operational risks but also seriously affects work efficiency.

[0003] Existing technologies have shortcomings in wiring efficiency, safety, and adaptability, especially in emergency repair scenarios requiring rapid access to 380V high-current power supplies. Traditional connection methods can no longer meet the requirements of modern power maintenance. To address these issues, this invention proposes a quick-connect wiring device. By improving the wiring method, it enhances wiring efficiency and safety, and optimizes the stability and reliability of electrical connections, making it particularly suitable for the rapid access of three-phase power supplies. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a convenient and quick-assembly lifting tool for on-load tap changers of transformers, aiming to improve the reliability, safety, and ease of operation of power supply boxes during maintenance, and is particularly suitable for the power supply and maintenance of three-phase electrical equipment. The technical solution adopted is as follows:

[0005] This utility model provides a maintenance power supply box, including a box body, inside which are arranged a main circuit breaker, several branch circuit breakers, and multiple quick-connect wiring devices. The main circuit breaker is installed on the upper part of the box body. The input terminal of the main circuit breaker is connected to an external three-phase power supply, and the output terminal of the main circuit breaker is connected to several branch circuit breakers. The several branch circuit breakers are installed below the main circuit breaker. The output terminal of each branch circuit breaker is connected to three quick-connect wiring devices, and each phase output of each branch circuit breaker is connected to one quick-connect wiring device. The quick-connect wiring devices are used for quick connection to the three-phase power supply.

[0006] Furthermore, the quick-connect wiring device includes terminals, metal plates, and inserts. The crimp terminals are used to fix and connect the ends of the output conductors of each phase of the circuit breaker. The crimp terminals are tightly connected to the metal plates. One end of the metal plate is fixedly connected to the crimp terminals by bolts, and the other end is fixedly connected to the inserts. The inserts are used to assist in fixing and current conduction.

[0007] Furthermore, the insert includes two symmetrically arranged U-shaped clips. The ends of the U-shaped clips that are far apart from each other are fixed ends and are fixed to the metal sheet. The other ends are free ends and are close to each other to form a clamping space for clamping external wires. A spring is horizontally provided on the inner side of the U-shaped clip. One end of the spring is connected to the fixed end of the U-shaped clip, and the other end is connected to the free end of the U-shaped clip.

[0008] Furthermore, the three quick-connect wiring devices connected to the output of each circuit breaker are separated by an insulating plate.

[0009] Furthermore, the spring is a constant force spring.

[0010] Through the above technical solution, this utility model not only solves the problems of cumbersome, time-consuming and unsafe wiring in traditional maintenance power boxes, but also improves work efficiency and system stability, and is suitable for various power maintenance, emergency repair and temporary power supply scenarios. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the interior of the box in an embodiment of this utility model;

[0012] Figure 2 This is a schematic diagram of the lower part of the box in an embodiment of this utility model;

[0013] Figure 3 This is an isometric view of the quick-connect wiring device in an embodiment of this utility model;

[0014] Figure 4 yes Figure 3 A magnified view of a section at point A in the middle;

[0015] Figure 5 This is a front view of the quick-connect wiring device in an embodiment of this utility model;

[0016] Figure 6 yes Figure 5 A magnified view of a section at point B.

[0017] The attached diagrams are labeled as follows: 1. Housing; 2. Main circuit breaker; 3. Branch circuit breaker; 301. Phase A output terminal; 302. Phase B output terminal; 303. Phase C output terminal; 4. Quick-connect wiring device; 401. Crimping terminal; 402. Metal sheet; 403. U-shaped clip; 404. Spring; 5. Insulating plate. Detailed Implementation

[0018] The following will describe the technology of the embodiments of the present utility model clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0019] Reference Figures 1-6 This embodiment provides a maintenance power supply box, including a box 1. The box 1 contains a main circuit breaker 2, several branch circuit breakers 3, and multiple quick-connect wiring devices 4. The main circuit breaker 2 is installed on the upper part of the box 1 and is used to control the power supply of the entire maintenance power supply box, providing overall power protection. The input terminal of the main circuit breaker 2 is connected to an external three-phase power supply, and the output terminal is connected to several branch circuit breakers 3. Several branch circuit breakers 3 are installed below the main circuit breaker 2 and are used to control the three-phase power supply of different devices or circuits. The input terminal of each branch circuit breaker 3 is connected to the output terminal of the main circuit breaker 2, and the three-phase output of the output terminal is connected to three quick-connect wiring devices 4 respectively. The A-phase output terminal 301, B-phase output terminal 302, and C-phase output terminal 303 of each branch circuit breaker 3 are each connected to a quick-connect wiring device 4. The quick-connect wiring devices 4 are used for quick connection to the three-phase power supply.

[0020] Specifically, the quick-connect wiring device 4 includes a terminal block 401, a metal plate 402, and a plug. The crimp terminal 401 is used to fix and connect the end of the output conductor of the circuit breaker (shown in the figure as the C-phase output terminal 303). The crimp terminal 401 and the metal plate 402 are tightly connected by bolts or quick-connection to ensure that the current is transmitted from the C-phase output terminal 303 to the quick-connect wiring device 4. The metal plate 402 serves as an intermediate conductor, with one end fixedly connected to the crimp terminal 401 by bolts and the other end fixedly connected to the fixed end of the plug, which is used to assist in fixing and current conduction. The metal plate 402 plays a key role in electrical conduction and mechanical connection.

[0021] Specifically, each set of inserts corresponds to one phase of power supply at the output terminal of the circuit breaker and includes two symmetrically arranged U-shaped clamps 403. The ends of the U-shaped clamps 403 that are far apart from each other are fixed ends, which are fixedly connected to the metal plate 402. The other ends are free ends, which are relatively close to each other to form a clamping space for clamping external conductors. A horizontal spring 404 is provided on the inner side of the U-shaped clamp 403. One end of the spring 404 is connected to the fixed end of the clamp, and the other end is connected to the free end. The external conductors are clamped by the elastic action of the spring 404.

[0022] Specifically, the three-phase output terminals (A-phase output terminal 301, B-phase output terminal 302, and C-phase output terminal 303) of each circuit breaker are separated by an insulating plate 5, and each quick-connect wiring device 4 is independently set up and isolated to prevent short circuits and phase-to-phase interference.

[0023] As a preferred option, spring 404 is a constant force spring.

[0024] This embodiment achieves a fast and reliable connection between a three-phase power supply (380V) and external devices. The specific working principle is as follows:

[0025] An external three-phase power supply is connected to the maintenance power supply box via the main circuit breaker 2. The main circuit breaker 2 controls the on / off state of the entire power system. The branch circuit breakers 3 within the power supply box distribute the power to different circuits. The output terminals of each branch circuit breaker 3 (A-phase output terminal 301, B-phase output terminal 302, C-phase output terminal 303) are connected to the quick-connect wiring device 4. Users can connect to the 380V power supply by inserting any two phases of power (e.g., A-phase and B-phase) between the corresponding U-shaped clips 403. Each set of U-shaped clips 403 corresponds to one phase of power supply. A spring 404 is located inside the clip, using its elasticity to clamp the wire. After the wire is inserted, the free end of the U-shaped clip 403 automatically clamps the wire, ensuring a reliable electrical connection. Current is conducted through the crimp terminals and metal plates to the U-shaped clips. When the wire is inserted between the U-shaped clips, the current is conducted through the metal plates, crimp terminals, and clips, thereby supplying power to external equipment. The quick-connection wiring device 4 between each phase is isolated by the insulating plate 5 to prevent phase-to-phase short circuits or misconnections and ensure operational safety.

[0026] Through the above embodiments, the present invention achieves the following beneficial effects:

[0027] The quick-connect wiring device 4 allows for quick, tool-free insertion and secure connection of external three-phase conductors, significantly reducing maintenance time and making it particularly suitable for efficient emergency repairs. Each phase output of each circuit breaker 3 can be individually connected to the quick-connect wiring device 4, enabling independent control and protection of different power circuits. The quick-connect wiring device 4, through the use of crimp terminals, metal plates, and spring clips, enhances the reliability of the overall electrical connection, ensuring the equipment maintains good performance even during long-term use.

Claims

1. A maintenance power supply box, comprising a box body, wherein a main circuit breaker, a plurality of branch circuit breakers, and multiple quick-connect wiring devices are disposed within the box body; the main circuit breaker is mounted on the upper part of the box body; the input terminal of the main circuit breaker is connected to an external three-phase power supply; the output terminal of the main circuit breaker is connected to the plurality of branch circuit breakers; and the plurality of branch circuit breakers are mounted below the main circuit breaker, characterized in that... Each circuit breaker's output terminal is connected to three quick-connect wiring devices, and each phase output of each circuit breaker is connected to a quick-connect wiring device. The quick-connect wiring devices are used for quick connection to a three-phase power supply.

2. The maintenance power supply box according to claim 1, characterized in that, The quick-connection wiring device includes terminals, metal plates, and inserts. The crimp terminals are used to fix and connect the ends of the conductors at the output terminals of each phase of the circuit breaker. The crimp terminals are tightly connected to the metal plates. One end of the metal plate is fixedly connected to the crimp terminals by bolts, and the other end is fixedly connected to the inserts. The inserts are used to assist in fixing and current conduction.

3. A maintenance power supply box according to claim 2, characterized in that, The insert includes two symmetrically arranged U-shaped clips. The ends of the U-shaped clips that are far apart from each other are fixed ends and are fixed to a metal sheet. The other ends are free ends and are close to each other to form a clamping space for clamping external wires. A spring is horizontally provided on the inner side of the U-shaped clip. One end of the spring is connected to the fixed end of the U-shaped clip, and the other end is connected to the free end of the U-shaped clip.

4. A maintenance power supply box according to any one of claims 1 to 3, characterized in that, The three quick-connect terminals connected to the output of each circuit breaker are separated by an insulating plate.

5. A maintenance power supply box according to claim 3, characterized in that, The spring is a constant force spring.

Images