Drip-proof APF wall-mounted box

Abstract

A drip-proof type APF wall-hung box comprises a box body, the box body is provided with a plurality of wall-hung mounting holes, an active filtering APF module is arranged in the box body, the active filtering APF module is connected with a wiring terminal used for being connected with a power grid, and the active filtering APF module is further connected with a circuit breaker. The key technical problem to be solved is that an APF module is integrated into a box body, ventilation is ensured, the APF box can be suitable for a dripping environment of a power distribution room, a user can conveniently install, use and maintain the APF box, the APF box is installed in a wall mode, and the floor occupied area is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply boxes, and in particular to a drip-proof APF wall-mounted box. Background Technology

[0002] Active power filters (APFs) emerged in recent years following the large-scale production of high-power insulated gate bipolar transistors (IGBTs). APFs overcome the aforementioned shortcomings while dynamically compensating for any odd harmonics within the range of 2 to 50. The characteristics of APFs are: fast response, good compensation effect, and they are particularly suitable for applications with severe load fluctuations.

[0003] In low-voltage distribution panels, APF cabinets are mostly floor-standing type. If a small-capacity APF is installed using a single low-voltage cabinet, it is a waste of land resources, increases the investment in industrial consumables, and wastes non-ferrous metals. Utility Model Content

[0004] To solve the above problems, this technical solution provides a drip-proof APF wall-mounted box.

[0005] To achieve the above objectives, the technical solution is as follows:

[0006] A drip-proof APF wall-mounted box includes a box body with multiple wall mounting holes. An active filter APF module is installed inside the box body. The active filter APF module is connected to a terminal block for connection to the power grid. The active filter APF module is also connected to a circuit breaker.

[0007] In some embodiments, the top of the housing is provided with a rain cover, and the rain cover extends beyond the housing with a first extension edge.

[0008] In some embodiments, the bottom of the housing has a second extension edge extending downwards.

[0009] In some embodiments, the upper end of the housing is provided with an air outlet, and the lower end is provided with an air inlet.

[0010] In some embodiments, the bottom of the enclosure is provided with a gland for wiring.

[0011] In some embodiments, the front end of the housing is provided with a door, and the door is provided with an observation window.

[0012] In some embodiments, the active power filter (APF) module is also connected to a surge protector.

[0013] The beneficial effects of this application are:

[0014] This application uses a separate APF wall-mounted box for small-capacity APF modules. The key technical problem it aims to solve is to integrate the APF module into the box, ensuring ventilation while being suitable for the dripping environment of the power distribution room. This facilitates user installation, use, and maintenance. Furthermore, this application is a wall-mounted installation, reducing the floor space occupied. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the air duct routing structure according to an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 3 ;

[0020] Figure 5 This is a schematic diagram of the electrical principle of an embodiment of this utility model. Detailed Implementation

[0021] 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.

[0022] Please refer to Figure 1-5 As shown, because the harmonic load in many ordinary power distribution rooms is not very high, only an APF of 100A or less is needed. However, most of them currently use APF low-voltage switchgear, which occupies at least one cabinet's volume. With only one APF module installed in a cabinet, the effective space utilization is only 20% of the entire cabinet. For customers, this is a serious waste of the power distribution room's space resources. Therefore, this patent can solve the problem of insufficient space utilization in power distribution rooms, and at the same time, effectively control the manufacturing cost of small-capacity APF boxes, further promoting the product.

[0023] If the environment in the power distribution room is harsh, such as dripping water, this APF box can adapt well to such a harsh environment and prevent water from damaging the electrical components inside the APF box.

[0024] Specifically, a drip-proof APF wall-mounted box includes a box body 1, the box body 1 having multiple wall mounting holes 2, an active filter APF module 3 inside the box body 1, the active filter APF module 3 being connected to a terminal block 4 for connection to the power grid, and the active filter APF module 3 also being connected to a circuit breaker 5.

[0025] In this embodiment, the top of the box 1 is provided with a rain cover 6, and the rain cover 6 extends beyond the box 1 with a first extension edge 7.

[0026] In this embodiment, the bottom of the box 1 has a second extension edge 8 extending downward.

[0027] In this embodiment, the upper end of the housing 1 is provided with an air outlet, and the lower end is provided with an air inlet.

[0028] In this embodiment, the bottom of the housing 1 is provided with a gland 9 for wiring.

[0029] In this embodiment, the front end of the box body 1 is provided with a door 10, and the door 10 is provided with an observation window 11.

[0030] In this embodiment, the active filter (APF) module 3 is also connected to a surge protector 12.

[0031] Specifically, typical distribution boxes are relatively small and are wall-mounted. The APF box designed here adopts the external structure of a distribution box. Standard wall-mounted distribution boxes are made of steel plates with a thickness of 1-1.5mm, bent and welded into the outer shell. Since the APF module weighs about 40kg, it is necessary to strengthen the structural strength of the distribution box, so a 2.0mm thick stainless steel plate is used to make the outer shell. Considering that there is enough space for the installation and wiring of the four main internal components, the final external dimensions of the distribution box are designed as follows: depth * width * height: 300 * 600 * 1000mm.

[0032] The enclosure is made of steel plate bent and welded into an outer shell, which is waterproof. The top and bottom plates of the enclosure have ventilation mesh openings. To prevent water dripping from the top of the enclosure, a waterproof rain eave is added. The rain eave has an internal cavity structure, and ventilation mesh openings are also made at the bottom. The bottom of the rain eave extends 2cm around the perimeter to allow rainwater to drip down and prevent rainwater from flowing back from the edges and entering the enclosure through the ventilation holes. For the same reason, the bottom of the enclosure also extends 2cm around the perimeter to facilitate waterproofing.

[0033] Because the distribution box is wall-mounted and requires front-operated and front-maintenance, the box body adopts a single-door structure at the front. To prevent rainwater from entering through the door gaps where the box body and the door meet, the door edges of the box body all adopt a folded edge structure, which is beneficial for waterproofing.

[0034] The enclosure uses a bottom cable entry and exit design, so a cable gland is installed at the bottom cable entry and exit point for cable routing. The cable gland serves to waterproof and secure the cable when it enters and exits the enclosure.

[0035] Run

[0036] The hot APF device has a built-in exhaust fan. The internal heat dissipation channel draws air upwards from the bottom, expelling heat from inside the APF module. Cool air enters through the bottom opening of the cabinet, becoming hot air upon entering the APF. This hot air is then exhausted to the outside through the cabinet's ventilation holes on the top and the rain vents. Figure 3 As shown;

[0037] Electrical aspects:

[0038] The APF box uses a 160A / 3P electronic molded case circuit breaker QF as the main protective device for the APF module, providing overload and short-circuit protection. The APF is a separate metal-enclosed module, which also has a fast-acting fuse for overload and short-circuit protection. Below the main switch, there is a surge protector FS and its corresponding backup protector QFS, which can discharge current to the circuits inside the box when lightning strikes the APF box, providing overvoltage protection for the main switch and APF devices inside the entire box.

[0039] After the APF box is designed according to the above requirements, the user only needs to connect the main voltage line of the distribution panel to the ABCN terminals on the incoming side of the circuit breaker QF of this APF box; then connect the current from the power grid to the secondary terminals inside this APF box through the sampling transformer. The filtering function of the APF module is calculated and controlled by the internal circuit of the module. The filtered current is generated from the APF module, passes through the lower end of the circuit breaker QF, and finally flows into the power grid to cancel the harmonic current in the power grid, thereby completing the dynamic compensation for any odd harmonic within the range of 2-50 in the power grid, that is, the full response time of the compensation is ≤18ms. The APF module has a built-in crystal display screen and an observation window on the box, so that maintenance personnel can see the relevant power parameters and operating status of the APF.

[0040] The technical effect of this solution is:

[0041] The APF box is made of 2.0mm thick stainless steel plate, which increases mechanical strength and can meet the harsh environment of dripping water and rust prevention.

[0042] Because APF is an electrical component that generates a lot of heat, this patented APF box is designed to be drip-proof while also incorporating a heat dissipation channel. The use of ventilation holes does not affect the overall drip-proof performance of the box, ensuring good heat dissipation and normal operation of the electrical components inside the box.

[0043] The APF box is compact, aesthetically pleasing, and easy to wall-mount, saving floor space. Compared to traditional low-voltage APF distribution cabinets, this solution not only eliminates the need for a large distribution cabinet, alleviating the current shortage of urban land, but also significantly reduces raw material manufacturing costs, such as steel, copper wire, and other non-ferrous metals. Therefore, this solution effectively meets the needs of users with limited substation space. It can also mitigate the harm caused by harmonics in the power grid, making a greater contribution to energy conservation and improved power quality.

[0044] 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. A drip-proof APF wall-mounted box, characterized in that, Includes a housing (1), the housing (1) having multiple wall mounting holes (2), an active filter APF module (3) inside the housing (1), the active filter APF module (3) being connected to a terminal block (4) for connection to the power grid, and the active filter APF module (3) also being connected to a circuit breaker (5).

2. The drip-proof APF wall-mounted box according to claim 1, characterized in that: The top of the box (1) is provided with a rain cover (6), and the rain cover (6) extends beyond the box (1) with a first extension edge (7).

3. A drip-proof APF wall-mounted box according to claim 2, characterized in that: The bottom of the box (1) has a second extension edge (8) extending downward.

4. A drip-proof APF wall-mounted box according to claim 1, characterized in that: The box (1) has an air outlet at the top and an air inlet at the bottom.

5. A drip-proof APF wall-mounted box according to claim 1, characterized in that: The bottom of the enclosure (1) is provided with a gland (9) for wiring.

6. A drip-proof APF wall-mounted box according to claim 1, characterized in that: The front end of the box (1) is provided with a door (10), and the door (10) is provided with an observation window (11).

7. A drip-proof APF wall-mounted box according to claim 1, characterized in that: The active filter APF module (3) is also connected to a surge protector (12).

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