Grid connection box

Abstract

The utility model provides a grid-connected box, which comprises a box body, and a fuse, a first surge protector, a second surge protector, a first alternating-current circuit breaker, an alternating-current residual-current circuit breaker, a second alternating-current circuit breaker and an electric meter are arranged in the box body. According to the utility model, the components are arranged in groups to form the first assembly and the second assembly, and the first assembly and the second assembly are distributed in the box body, so that the overall volume of the box body is reduced, and overload and short-circuit protection of the photovoltaic module and lightning protection of the module side can be provided for equipment; the front-end fuse is connected with the first surge protector in parallel, so that a direct-current end can be protected from being interfered by lightning stroke and the like, the output end of the inverter is output to an original distribution box of a user after passing through the miniature circuit breaker, and the lower-end circuit breaker is connected with the second surge protector in parallel, so that the direct-current end can be protected from being interfered by lightning stroke and the like. And the alternating-current end can be protected from interference of lightning stroke and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of grid connection boxes, in particular to a grid connection box. Background Art

[0002] A grid-connected box is a device used in photovoltaic power generation systems. It is primarily used to safely transmit the direct current generated by solar panels to the inverter, and then transmit the alternating current converted by the inverter to the power grid, load, or local meter box. The grid-connected box typically includes components such as a DC protection switch, current transformer, and power monitoring device. Its main function is to ensure that the electricity generated by the photovoltaic system can be safely and efficiently connected to the power grid, while also being able to monitor current and power. The grid-connected box plays a vital role in photovoltaic power generation systems and is one of the key devices for realizing the utilization of renewable energy.

[0003] At present, some grid-connected boxes are designed with all devices arranged vertically at the top and bottom of the box, and all devices are located on the side of the box away from the cabinet door. When a large number of devices need to be installed, a larger installation space is required. According to the above arrangement method, the height or length of the box needs to be increased, and the grid-connected box is too large, which makes transportation and handling difficult. Utility Model Content

[0004] The purpose of the present utility model is to provide a grid-connected box to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A grid-connected box, comprising a box body, wherein a fuse, a first surge protector, a second surge protector, a first AC circuit breaker, an AC leakage circuit breaker, a second AC circuit breaker, and an electric meter are installed inside the box body; a photovoltaic connector, an RJ connector, a CT connector, a first AC connector, and a second AC connector are provided at the bottom of the box body; a cover plate is detachably installed inside the box body, and one side of the fuse, the first surge protector, the second surge protector, the first AC circuit breaker, the AC leakage circuit breaker, the second AC circuit breaker, and the electric meter all penetrate the cover plate;

[0007] The fuse, the first surge protector and the second surge protector are arranged side by side to form a first component, the first AC circuit breaker, the AC leakage circuit breaker, the second AC circuit breaker and the electric meter are arranged side by side to form a second component, and the first component is arranged below the second component.

[0008] Preferably, a connecting seat is fixedly provided on the inner wall of the box body, and the cover plate is fixed to the surface of the connecting seat by screws.

[0009] Preferably, a box cover is hinged on the surface of the box body, and the connection between the box cover and the box body is connected by a buckle lock.

[0010] Preferably, a ventilation valve is also provided at the bottom of the box.

[0011] Preferably, a hanging bracket is fixedly installed on the back of the box, the hanging bracket is hung on the surface of the mounting bracket, and the mounting bracket is fixedly installed on the surface of the wall.

[0012] Preferably, a bottom bracket is fixedly mounted on the back of the box, and expansion bolt holes are provided on the surface of the bottom bracket.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model arranges each component in groups to form a first component and a second component. The first component and the second component are distributed inside the box, which reduces the overall volume of the box and can provide overload and short-circuit protection for the photovoltaic module and lightning protection on the module side. The photovoltaic connector is connected to the DC circuit of the grid-connected box, and after being protected by the fuse, it is output to the inverter. The front-end fuse is connected in parallel with the first surge protector to protect the DC end from interference such as lightning strikes. The output end of the inverter has been connected to the original distribution box of the user after passing through the miniature circuit breaker. The lower end circuit breaker is connected in parallel with the second surge protector to protect the AC end from interference such as lightning strikes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the front structure of the cover plate of the utility model;

[0017] Figure 3 This is a schematic diagram of the bottom structure of the utility model;

[0018] Figure 4 It is a side structural diagram of the utility model;

[0019] Figure 5 This is a schematic diagram of the back structure of the utility model;

[0020] Figure 6 This is the electrical schematic diagram of the utility model.

[0021] In the figure: 1. Fuse; 2. First surge protector; 3. Second surge protector; 4. First AC circuit breaker; 5. AC leakage circuit breaker; 6. Second AC circuit breaker; 7. PV connector; 8. Vent valve; 9. RJ45 connector; 10. CT connector; 11. First AC connector; 12. Second AC connector; 13. Electric meter; 14. Connector; 15. Cover; 16. Box; 17. Box cover; 18. Hasp lock; 19. Hanger; 20. Mounting bracket; 21. Bottom bracket; 22. Expansion bolt hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0023] See also Figure 1-6 The utility model provides a grid-connected box, comprising a box body 16, wherein a fuse 1, a first surge protector 2, a second surge protector 3, a first AC circuit breaker 4, an AC leakage circuit breaker 5, a second AC circuit breaker 6 and an electric meter 13 are installed inside the box body 16, a photovoltaic connector 7, an RJ45 connector 9, a CT connector 10, a first AC connector 11 and a second AC connector 12 are arranged at the bottom of the box body 16, a cover plate 15 is detachably installed inside the box body 16, the fuse 1, the first surge protector 2, the second surge protector 3, the first AC circuit breaker 4, the AC leakage circuit breaker 5, the second AC circuit breaker 6 and an electric meter 13 are installed A surge protector 2, a second surge protector 3, a first AC circuit breaker 4, an AC leakage circuit breaker 5, a second AC circuit breaker 6 and one side of the electric meter 13 all pass through the cover 15, and a vent valve 8 is also provided at the bottom of the box 16. The fuse 1, the first surge protector 2 and the second surge protector 3 are arranged side by side to form a first component, and the first AC circuit breaker 4, the AC leakage circuit breaker 5, the second AC circuit breaker 6 and the electric meter 13 are arranged side by side to form a second component. The first component is arranged below the second component.

[0024] See also Figure 1 、 23. The components are connected to the DC circuit of the grid-connected box and output to the inverter after being protected by fuse 1. The DC circuit has surge protection. The output of the inverter is connected to the AC circuit of the grid-connected box. After passing through the circuit breaker, the output is connected to the user's original distribution box. The backup output of the inverter is connected to the AC circuit of the grid-connected box and, after passing through the circuit breaker, the output is connected to the important load. The grid-connected box has a built-in electric meter 13, which collects power and other data through the CT mutual inductor and transmits it to the electric meter 13 through the CT connector 10 at the bottom of the box 16. The electric meter 13 then communicates with the inverter through the RJ45 connector 9. The AC side of the grid-connected box is configured with surge protection, and backup protection is set at the front end of the surge protector.

[0025] It should be noted that the housing 16 is made of metal, while the cover 15 is made of non-metallic material. The material is flame-retardant with a UL94-V0 rating, which complies with RoHS standards. The overall protection level of the housing 16 is no less than IP54, suitable for outdoor use. The wires required within the housing 16 should be UL1015 standard wire with UL certification, and the wire diameter should match the current it carries. All external connection interfaces on the housing 16 are plug-in interfaces, and the protection level of all plug connectors should be no less than IP54. All plug connectors should be CE certified.

[0026] A connecting seat 14 is fixedly provided on the inner wall of the box body 16, and a cover plate 15 is fixed to the surface of the connecting seat 14 by screws. A box cover 17 is hinged on the surface of the box body 16, and the connection between the box cover 17 and the box body 16 is connected by a hasp lock 18.

[0027] See also Figure 1 and 2 All the above components and internal wiring should be below the cover 15, leaving only the operating handle of the circuit breaker, the operating handle of the fuse 1, the first surge protector 2, the second surge protector 3, and the display screen and operating buttons of the electric meter 13. The internal cover 15 is tightly combined with the box 16, with a gap of no more than 2mm, and the setting of the buckle lock 18 can facilitate the connection between the box 16 and the box cover 17. The box cover 17 can protect the internal components of the box 16 while not affecting the normal inspection of the box 16 by the staff.

[0028] A hanging bracket 19 is fixedly installed on the back of the box 16, and the hanging bracket 19 is hung on the surface of the mounting bracket 20. The mounting bracket 20 is fixedly installed on the surface of the wall. A bottom bracket 21 is fixedly installed on the back of the box 16, and an expansion bolt hole 22 is provided on the surface of the bottom bracket 21.

[0029] See also Figure 4 and 5The box 16 is installed in a hanging manner as a whole and can be installed on the wall. It is necessary to ensure that the side of the box 16 with the inlet and outlet holes is facing downward. It is prohibited to install it tilted left and right, and the front and back tilt should not exceed 30°. First, fix the mounting bracket 20 to the wall with expansion bolts, and then install the suspension bracket 19 on the back of the box 16 and hang it on the top of the mounting bracket 20, so that the box 16 naturally droops under its own gravity. At this time, the box 16 can drive the bottom bracket 21 to contact the wall. At this time, the bottom bracket 21 can continue to be fixed to the wall with expansion bolts, and the installation of the box 16 is completed.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grid-connected box, comprising a box body (16), characterized in that: The box (16) is internally installed with a fuse (1), a first surge protector (2), a second surge protector (3), a first AC circuit breaker (4), an AC leakage circuit breaker (5), a second AC circuit breaker (6), and an electric meter (13); a photovoltaic connector (7), an RJ45 connector (9), a CT connector (10), a first AC connector (11), and a second AC connector (12) are provided at the bottom of the box (16); a cover plate (15) is detachably installed inside the box (16); and one side of the fuse (1), the first surge protector (2), the second surge protector (3), the first AC circuit breaker (4), the AC leakage circuit breaker (5), the second AC circuit breaker (6), and the electric meter (13) all penetrate the cover plate (15); The fuse (1), the first surge protector (2) and the second surge protector (3) are arranged side by side to form a first component, the first AC circuit breaker (4), the AC leakage circuit breaker (5), the second AC circuit breaker (6) and the electric meter (13) are arranged side by side to form a second component, and the first component is arranged below the second component.

2. A grid-connected box according to claim 1, characterized in that: A connecting seat (14) is fixedly provided on the inner wall of the box body (16), and the cover plate (15) is fixedly provided on the surface of the connecting seat (14) by screws.

3. The grid-connected box according to claim 1, characterized in that: A box cover (17) is hinged on the surface of the box body (16), and the connection between the box cover (17) and the box body (16) is connected by a buckle lock (18).

4. The grid-connected box according to claim 1, characterized in that: The bottom of the box (16) is also provided with a breathable valve (8).

5. The grid-connected box according to claim 1, characterized in that: A hanging bracket (19) is fixedly mounted on the back of the box (16), and the hanging bracket (19) is hung on the surface of a mounting bracket (20), and the mounting bracket (20) is fixedly mounted on the surface of a wall.

6. The grid-connected box according to claim 5, characterized in that: A bottom bracket (21) is fixedly mounted on the back of the box body (16), and an expansion bolt hole (22) is provided on the surface of the bottom bracket (21).

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