Ultra-thin low-voltage power distribution cabinet integrating incoming line, outgoing line and maintenance

Abstract

An inlet, outlet and maintenance integrated ultra-thin low-voltage power distribution cabinet comprises a UPS cabinet and a power distribution cabinet which are located on the two sides respectively, a circuit breaker QF1 is arranged in the power distribution cabinet, one end of the circuit breaker QF1 is connected with the mains supply input end, the other end of the circuit breaker QF1 is connected with the input end of the UPS cabinet, the output end of the UPS cabinet is connected with one end of a circuit breaker QF3, and the other end of the circuit breaker QF3 is connected with the other end of the UPS cabinet. The other end of the circuit breaker QF3 is connected with a load end, one end of the circuit breaker QF2 is located in the power distribution cabinet, one end of the circuit breaker QF2 is connected with a commercial power input end, and the other end of the circuit breaker QF2 is connected with the load end.

Description

Technical Field

[0001] This utility model relates to the field of power distribution cabinets, and in particular to an ultra-thin low-voltage power distribution cabinet that integrates incoming, outgoing, and maintenance lines. Background Technology

[0002] In low-voltage power distribution systems of data / communication centers or securities centers, these locations require the storage of large amounts of data. To ensure data reliability, the low-voltage power distribution system needs its own emergency power supply. Therefore, in China, the common power supply for such loads is a low-voltage UPS cabinet with large capacity. Due to recent urban land scarcity and price increases, the structure of power distribution cabinets is trending towards larger capacity, smaller size, and easier maintenance. Currently, a 600kVA UPS requires at least an 800mm wide low-voltage power distribution cabinet to accommodate the incoming and outgoing lines and maintenance switches. However, insufficient space in the power distribution room prevents the installation of standard low-voltage cabinets, necessitating adjustments to the power supply scheme, the layout of the power distribution room, or an increase in the room's area. These solutions are very costly and time-consuming, impacting the overall project's power supply and construction progress. Utility Model Content

[0003] To address the aforementioned issues, this technical solution provides an ultra-thin low-voltage distribution cabinet that integrates incoming, outgoing, and maintenance lines.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] An ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines includes a UPS cabinet and a distribution cabinet located on both sides. The distribution cabinet is equipped with a circuit breaker QF1. One end of the circuit breaker QF1 is connected to the mains input terminal, and the other end is connected to the input terminal of the UPS cabinet. The output terminal of the UPS cabinet is connected to one end of the circuit breaker QF3, and the other end of the circuit breaker QF3 is connected to the load terminal. The cabinet also includes a circuit breaker QF2 located inside the distribution cabinet, with one end connected to the mains input terminal and the other end connected to the load terminal.

[0006] In some embodiments, circuit breakers QF1, QF2, and QF3 are connected to the front or rear of the cabinet via copper busbars.

[0007] In some embodiments, circuit breakers QF1, QF2, and QF3 are molded case circuit breakers.

[0008] In some embodiments, the circuit breaker QF1 is connected to the UPS cabinet via an input terminal, and the UPS cabinet is connected to the input terminal via a cable;

[0009] The circuit breaker QF3 is connected to the UPS cabinet via an output terminal, and the UPS cabinet is connected to the output terminal via a cable.

[0010] In some embodiments, the top of the distribution cabinet is detachably connected to a top frame.

[0011] In some embodiments, the distribution cabinet is supported by Z-shaped columns and a frame. Attached Figure Description

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 3 ;

[0016] Figure 4 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 4 ;

[0017] Figure 5 This is a schematic diagram of the electrical structure of an embodiment of the present utility model. Detailed Implementation

[0018] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 of the present utility model and are not intended to limit the present utility model.

[0019] Please refer to Figure 1-5 As shown, an ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines includes a UPS cabinet 1 and a distribution cabinet 2 located on both sides. The distribution cabinet 2 is equipped with a circuit breaker QF1, one end of which is connected to the mains input terminal and the other end is connected to the input terminal of the UPS cabinet 1. The output terminal of the UPS cabinet 1 is connected to one end of a circuit breaker QF3, and the other end of the circuit breaker QF3 is connected to the load terminal. The distribution cabinet 2 also includes a circuit breaker QF2 located inside the distribution cabinet 2, one end of which is connected to the mains input terminal and the other end of which is connected to the load terminal.

[0020] The utilization rate of effective space in existing low-voltage distribution cabinets in the domestic market is not high. The width of the cabinet is generally at least 800mm. With the current shortage of urban land, traditional distribution cabinets are large in size, which is a great waste of land resources and requires huge amounts of industrial consumables and non-ferrous metals. In order to save valuable resources such as land and non-ferrous metals, we now make full use of the space of low-voltage distribution cabinets and select large-capacity, small-volume switches. By modifying the layout and wiring method inside the switch cabinet, the three 1250A high-current switches mentioned above can be installed in a low-voltage distribution cabinet with a width of 400mm. Compared with traditional distribution cabinets, this saves at least 400mm wide * 1000mm deep * 2000mm high effective space.

[0021] In this embodiment, circuit breakers QF1, QF2, and QF3 are connected to the front or rear of the cabinet via copper busbars.

[0022] In this embodiment, circuit breakers QF1, QF2, and QF3 are molded case circuit breakers.

[0023] In this embodiment, the circuit breaker QF1 is connected to the UPS cabinet 1 via an input terminal, and the UPS cabinet 1 is connected to the input terminal via a cable.

[0024] The circuit breaker QF3 is connected to the UPS cabinet 1 via an output terminal, and the UPS cabinet 1 is connected to the output terminal via a cable.

[0025] In this embodiment, the top frame 3 is detachably connected to the upper end of the power distribution cabinet.

[0026] In this embodiment, the power distribution cabinet uses Z-shaped columns and a frame for support.

[0027] Specifically, the structure of this application is as follows:

[0028] The cabinet body is made of high-strength 2mm thick cold-rolled steel plate and assembled into a fully enclosed structure. The frame of the cabinet uses Z-shaped new material columns and mounting beams to form the frame of this distribution cabinet. In addition, the bottom, left and right sealing plates, front door panel, rear door panel, mounting bracket, insulation board and insulation fasteners are assembled into a standard fixed low-voltage cabinet shell with a width of 400mm, a depth of 1000mm and a height of 2000mm.

[0029] The overall layout of the low-voltage distribution cabinet is as follows: three 1250A / 3P molded case circuit breakers (QF1-3) for UPS input, output, and maintenance bypass are fixedly installed at the front of the cabinet, arranged from top to bottom as QF1, QF2, and QF3. Since the maximum rated current of the molded case circuit breaker can reach 1600A, using a molded case circuit breaker for the main switch can significantly reduce the size of the cabinet. The selected switch is a 1250A / 3P with a width of 210mm, ensuring a safe distance between the energized conductor and the cabinet edge, allowing for the installation of the molded case circuit breaker. Circuit breakers QF1-3 are connected using a 50*8 double-row connection. For ease of wiring, the external wiring conductors are all routed to the front or rear of the cabinet via copper busbars, facilitating connections and maintenance between this cabinet and the UPS cabinet, as well as external cables. Figure 2 (as shown);

[0030] To better integrate with UPS units of 2000mm and 2200mm height while maintaining the same height, a 200mm high removable top frame structure is added to the 2000mm high low-voltage cabinet casing. Knockout holes for cable entry and exit are provided on the side, top, and bottom panels of the cabinet, allowing for both side-entry and side-exit cabling as well as top and bottom entry and exit. This cabinet is installed next to the UPS unit, facilitating front operation and front and rear maintenance (e.g.,...). Figure 2 and 3 (as shown);

[0031] The electrical aspects are as follows:

[0032] This ultra-thin low-voltage distribution cabinet, integrating incoming and outgoing lines and maintenance bypass, is primarily a large-capacity UPS cabinet, providing control and protection. Inside the cabinet are three 1250A / 3P molded case circuit breakers: QF1 is the UPS input circuit breaker, QF2 is the UPS external maintenance bypass circuit breaker, and QF3 is the UPS output circuit breaker. The electrical connections within the cabinet utilize the positions of these three circuit breakers, employing the most material-efficient method: the upper end of QF1 is the UPS input terminal; the lower end of QF1 is connected to the upper end of QF2 via a copper busbar, and then this end extends to the rear of the cabinet as the mains input terminal; the lower end of QF2 is connected to the upper end of QF3 via... After the copper busbar is connected, extend this end to the back of the cabinet to form the load-side connection terminal; the lower end of QF3 is the UPS output terminal; all four terminals of this cabinet are connected by drilling standard holes in 50*8 double copper busbars, using low-voltage cables and making electrical connections according to the corresponding primary system diagram; in addition, these three switches QF1 and QF3 are reverse-flow (i.e., the current flows in from the lower end of the switch, passes through the switch, and flows out from the upper end). Since the switches are selected from internationally renowned brands, this solution will not affect the performance of the switches. It is precisely because this solution is feasible that the complex connection and bending of the conductive copper busbar inside the cabinet are avoided; ultimately, the 400mm wide cabinet body can be used to ensure the smooth design of this solution;

[0033] After the connections are made as described above, under normal circumstances, QF1 and QF3 are closed, and QF2 is open. Mains power enters the rectifier-inverter module of the UPS cabinet through QF1. The AC mains power is first rectified into DC by the rectifier in this module, and then inverted back into AC by the inverter. This DC power then passes through the QF3 switch and is output to the load downstream of the UPS. Simultaneously, the rectified DC power charges the battery, which is then in a float charge state once fully charged. If the mains power fails, the fully charged battery will be inverted back into AC power by the inverter to supply power to the load. Because the battery capacity is limited, it can only power the load for about 15-30 minutes. Generally, during this battery power supply period, once the mains power is restored, the mains power can continue to supply power to the load and charge the battery, following the same principle. Therefore, the power supply to the load is continuous and uninterrupted, ensuring continuous power supply to critical loads and greatly improving the reliability of the power supply.

[0034] When the UPS malfunctions, QF1 and QF3 disconnect, and QF2 closes. At this time, the UPS is isolated from the mains power and the load, and maintenance personnel can repair the UPS. The mains power is supplied directly to the load through the external maintenance bypass circuit breaker QF2. After the UPS is repaired and normal, it returns to the normal power supply state described above.

[0035] The beneficial effects of this application are:

[0036] This application presents an ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines, capable of handling current up to 1250A, and compatible with 600kVA high-capacity UPS cabinets. The three switches inside the cabinet are rationally arranged, and the UPS incoming and outgoing switches are wired in reverse order, greatly reducing the complexity of electrical connections between switches within the cabinet. The four wiring terminals inside the cabinet are conveniently located for user access. The overall cabinet design is reasonable, easy to maintain, and aesthetically pleasing. This cabinet primarily works in conjunction with the UPS cabinet as its protection and control unit. It provides safe, reliable, high-quality, and economical power supply for primary loads such as those in data management centers; playing an irreplaceable role in communication networks, it is a crucial supporting device for UPS cabinets in data center construction.

[0037] The design scheme of this application makes the cabinet available in two heights, using a top frame module to standardize the cabinets of different heights. It can be used with two commonly used UPS cabinets on the market. The 2-meter high UPS cabinet does not need this module, while the 2.2-meter high UPS cabinet can be equipped with a 0.2-meter high top frame module.

[0038] This application makes full use of the effective space of a 400mm(W)*1000mm(D)*2000 / 2200mm(H) low-voltage distribution cabinet, saving at least 400mm*1000mm(D)*2000mm(H) of effective space in the power distribution room. This significantly reduces the valuable land area occupied by the distribution cabinet in the power distribution room, effectively alleviating the current shortage of urban land area. Moreover, it greatly saves on the manufacturing cost of raw materials, such as the use of steel, copper wire, and other non-ferrous metals. Therefore, this solution well meets the needs of users with limited power distribution room space.

[0039] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. An ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines, characterized in that, The system includes a UPS cabinet (1) and a power distribution cabinet (2) located on both sides. The power distribution cabinet (2) is equipped with a circuit breaker QF1. One end of the circuit breaker QF1 is connected to the mains input terminal, and the other end is connected to the input terminal of the UPS cabinet (1). The output terminal of the UPS cabinet (1) is connected to one end of the circuit breaker QF3, and the other end of the circuit breaker QF3 is connected to the load terminal. The system also includes a circuit breaker QF2 located in the power distribution cabinet (2), one end of which is connected to the mains input terminal and the other end of which is connected to the load terminal.

2. The ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines according to claim 1, characterized in that: The circuit breakers QF1, QF2, and QF3 are connected to the front or rear of the cabinet via copper busbars.

3. The ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines according to claim 2, characterized in that: The circuit breakers QF1, QF2, and QF3 are molded case circuit breakers.

4. The ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines according to claim 1, characterized in that: The circuit breaker QF1 is connected to the UPS cabinet (1) via an input terminal, and the UPS cabinet (1) is connected to the input terminal via a cable. The circuit breaker QF3 is connected to the UPS cabinet (1) via an output terminal, and the UPS cabinet (1) is connected to the output terminal via a cable.

5. The ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines according to claim 1, characterized in that: The top of the distribution cabinet is detachably connected to a top frame (3).

6. The ultra-thin low-voltage distribution cabinet integrating incoming, outgoing, and maintenance lines according to claim 1, characterized in that: The distribution cabinet uses Z-shaped columns and a frame for support.

Images