Photovoltaic grid-connected box

Abstract

The utility model discloses a photovoltaic grid-connected box which comprises a box body, a cabinet door is hinged to the surface of the box body through a hinge, a waterproof sealing ring is arranged at the closed position of the surface of the cabinet door and the box body, the interior of the top of the box body is divided into an installation chamber and a meter chamber through a first partition plate, a plurality of installation supports are arranged in the installation chamber, and a metering junction box is installed in the meter chamber. The interior of the bottom of the box body is divided into a switch chamber and a power connection chamber through a second partition plate, a disconnecting link used for disconnecting a circuit is installed in the switch chamber, a first circuit breaker is installed in the power connection chamber, the photovoltaic grid-connected box is suitable for ground centralized type, ground string type, ground distributed type and other installation requirements, the photovoltaic grid-connected box is compact in structure, a standardized protection assembly is arranged, and the photovoltaic grid-connected box is convenient to use. According to the technical scheme of the utility model, the direct current generated by the photovoltaic module can be safely monitored and protected by the first circuit breaker, the second circuit breaker, the disconnecting link, the surge protector and the like, and the circuit can be easily cut off when the photovoltaic system is maintained, faulted and checked, so that the stable operation of the system and the personal safety are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic grid connection boxes, and particularly relates to a photovoltaic grid connection box. Background Technique

[0002] A photovoltaic grid connection cabinet is a power interface device for a solar photovoltaic power station, which has functions such as power distribution, electric energy metering, protection control, etc. It can integrate the electric energy generated by a solar photovoltaic power generation system into the power grid and provide a safe and stable power output.

[0003] Currently, a photovoltaic grid connection cabinet usually includes a photovoltaic inverter, a power protection switch communication module, etc. The photovoltaic inverter converts the direct current generated by the photovoltaic panels on the top of the photovoltaic grid connection cabinet into alternating current to meet the requirements of the power grid. However, when a short circuit occurs between photovoltaic modules or other electrical equipment in the photovoltaic grid connection cabinet, a huge short-circuit current will be generated. When there is no protection measure in the photovoltaic grid connection cabinet to detect it in time, it may burn out photovoltaic modules, connecting cables and other related equipment, resulting in equipment damage. Content of the Utility Model

[0004] The purpose of the utility model is to provide a photovoltaic grid connection box to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A photovoltaic grid connection box, comprising:

[0006] A box body, on the surface of which a cabinet door is hinged through a hinge, and a waterproof sealing ring is provided at the closing part of the cabinet door surface and the box body. Inside the top of the box body, an installation chamber and a meter chamber are separated by a first partition board. Inside the installation chamber, there are several installation brackets for installing current transformers. Inside the meter chamber, a metering junction box is installed. Inside the bottom of the box body, a switch chamber and a power connection chamber are separated by a second partition board. Inside the switch chamber, a knife switch for disconnecting the circuit is installed. Inside the power connection chamber, a first circuit breaker is installed.

[0007] Preferably, an electric energy meter is installed inside the meter chamber, and a surge protector and a second circuit breaker are also installed inside the power connection chamber.

[0008] Preferably, wire inlet holes are provided on the surface of the box body at the bottoms of the switch chamber and the power connection chamber.

[0009] Preferably, the box body is provided with a top cover on the top, and the top cover surface is provided with a ventilation mesh plate.

[0010] Preferably, a number of fixing ears are connected to the two side surfaces of the box body.

[0011] Preferably, the cabinet door surface is provided with a transparent viewing window.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: The photovoltaic grid-connected box is applicable to the AC 50Hz power distribution systems of power users such as ground centralized, ground string-type, and ground distributed ones, with a rated working voltage of 380V and a rated working current of 2000A. It is used for the power conversion, distribution, and control of power, lighting, and distribution equipment. Moreover, the photovoltaic grid-connected box has a compact structure and is equipped with standardized protection components such as a first circuit breaker, a second circuit breaker, a knife switch, a surge protector, etc. It can safely monitor and protect the direct current generated by the photovoltaic modules, and can ensure that the photovoltaic system is easy to cut off the circuit during maintenance, faults, and inspections to ensure the stable operation of the system and personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model;

[0014] Figure 2 is a sectional view of the utility model;

[0015] Figure 3 is a side view of the utility model.

[0016] In the figure: 1, box body; 2, cabinet door; 3, first partition; 4, installation chamber; 5, meter chamber; 6, installation bracket; 7, metering wiring box; 8, second partition; 9, switch chamber; 10, power connection chamber; 11, knife switch; 12, first circuit breaker; 13, electric energy meter; 14, surge protector; 15, second circuit breaker; 16, inlet hole; 17, top cover; 18, ventilation net plate; 19, fixed ear; 20, transparent viewing window. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] The present utility model provides a photovoltaic grid-connected box as Figures 1 - 3 shown, including:

[0019] Cabinet 1, on the surface of the cabinet 1, a cabinet door 2 is hinged through a hinge, and a waterproof sealing ring is provided at the closing part of the cabinet door 2 and the cabinet 1. Inside the top of the cabinet 1, an installation chamber 4 and a meter chamber 5 are separated by a first partition 3. Inside the installation chamber 4, several installation brackets 6 for installing current transformers are provided. Inside the meter chamber 5, a metering connection box 7 is installed. Inside the bottom of the cabinet 1, a switch chamber 9 and a power connection chamber 10 are separated by a second partition 8. Inside the switch chamber 9, a knife switch 11 for disconnecting the circuit is installed. Inside the power connection chamber 10, a first circuit breaker 12 is installed.

[0020] Inside the meter chamber 5, an electric energy meter 13 is installed. The electric energy meter 13 can accurately measure the electric energy generated by the photovoltaic system. By accurately measuring the power generation, users can clearly understand the power generation efficiency and performance of the photovoltaic system. Inside the power connection chamber 10, a surge protector 14 and a second circuit breaker 15 are also installed. Since the photovoltaic grid-connected box is usually installed outdoors and is easily affected by lightning strikes, the surge protector 14 can quickly introduce the powerful lightning current into the ground when a lightning strike occurs, protecting the electrical equipment inside the photovoltaic grid-connected box from being damaged by lightning strikes;

[0021] The first circuit breaker 12 and the second circuit breaker 15 adopt professional DC high-voltage circuit breakers, and the DC withstand voltage value is not less than DC1000V, which is safe and reliable.

[0022] On the surface of the cabinet 1 and at the bottoms of the switch chamber 9 and the power connection chamber 10, inlet holes 16 are provided. Through the setting of the inlet holes 16, specific channels can be provided for external power lines and signal lines to enter the cabinet 1. By setting the inlet holes 16 at the bottoms of the switch chamber 9 and the power connection chamber 10, the lines can enter from below and be connected to the equipment inside the cabinet 1, avoiding the lines being distributed around the cabinet 1 in a messy manner.

[0023] On the top of the cabinet 1, a top cover 17 is provided, and a ventilation mesh plate 18 is provided on the surface of the top cover 17. Ventilation holes are provided inside the top cover 17. The wind entering through the ventilation mesh plate 18 blows into the ventilation holes and then blows into the cabinet 1 through the ventilation holes, which can dissipate heat from the equipment inside the cabinet 1.

[0024] On both side surfaces of the cabinet 1, several fixing ears 19 are connected. The cabinet 1 can be installed by passing bolts through the fixing ears 19.

[0025] On the surface of the cabinet door 2, a transparent window 20 is provided. Through the transparent window 20, operators can directly observe the operating state of the equipment inside the photovoltaic grid-connected box without opening the cabinet door 2, so as to detect abnormal situations in time.

[0026] This photovoltaic grid-connected box has a compact structure inside the box body 1. It can access multiple solar photovoltaic arrays simultaneously. The maximum current of each path can reach 11A, which can meet the needs of different users. Moreover, sensors and monitoring and display modules can be configured according to needs to measure and monitor the current of each path. It can remotely record and display the operating status without going to the site, facilitating remote control, professional data monitoring, and fault diagnosis of the power station, and can greatly improve the operating efficiency and management effect of the power station;

[0027] It is equipped with standardized protection components such as the first circuit breaker 12, the second circuit breaker 15, the knife switch 11, the surge protector 14, etc. It can safely monitor and protect the direct current generated by the photovoltaic components, and can ensure that the photovoltaic system is easy to cut off the circuit during maintenance, faults, and inspections. Moreover, the equipment in the box body 1 is connected in a plug-and-play manner, making on-site installation and debugging very convenient. At the same time, the internal components are reasonably distributed, facilitating later maintenance and upgrading;

[0028] The power input of the photovoltaic system is controlled by the first circuit breaker 12 and the second circuit breaker 15 to control the on-off of the direct current generated by the photovoltaic components. When faults such as overcurrent and short circuit occur in the photovoltaic system, it can automatically trip and cut off the circuit, thereby protecting the system equipment and lines. Then, the operator can operate the knife switch 11 to completely isolate the photovoltaic system from the power supply, providing an obvious disconnection point to ensure safety, thus protecting the safety of the equipment. The surge protector 14 will automatically act when there is an overvoltage impact (such as transient overvoltage like lightning), introducing the overvoltage to the ground to protect the system equipment. And if the overvoltage persists or the surge protector 14 is damaged, the circuit can also be automatically disconnected through the first circuit breaker 12 and the second circuit breaker 15 to prevent further damage to the system caused by the overvoltage. The first circuit breaker 12 and the second circuit breaker 15 automatically trip and disconnect to cut off the circuit and protect the system equipment.

[0029] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A photovoltaic grid-connected box, characterized in that, Including: A box body (1), on the surface of which a cabinet door (2) is hinged through a hinge, and a waterproof sealing ring is provided at the closing part of the cabinet door (2) and the box body (1). Inside the top of the box body (1), an installation chamber (4) and a meter chamber (5) are separated by a first partition plate (3). In the installation chamber (4), there are several installation brackets (6) for installing current transformers. In the meter chamber (5), a metering connection box (7) is installed. Inside the bottom of the box body (1), a switch chamber (9) and a power connection chamber (10) are separated by a second partition plate (8). In the switch chamber (9), a knife switch (11) for disconnecting the circuit is installed. In the power connection chamber (10), a first circuit breaker (12) is installed.

2. A photovoltaic grid-connected box according to claim 1, characterized in that: An electric energy meter (13) is installed in the meter chamber (5), and a surge protector (14) and a second circuit breaker (15) are also installed in the power connection chamber (10).

3. A photovoltaic grid-connected box according to claim 1, characterized in that: On the surface of the box body (1) and at the bottoms of the switch chamber (9) and the power connection chamber (10), there are inlet holes (16).

4. A photovoltaic grid-connected box according to claim 1, characterized in that: A top cover (17) is provided at the top of the box body (1), and a ventilation mesh plate (18) is provided on the surface of the top cover (17).

5. A photovoltaic grid-connected box according to claim 1, characterized in that: Several fixing ears (19) are connected to both side surfaces of the box body (1).

6. The photovoltaic grid-connected box according to claim 1, characterized in that: A transparent viewing window (20) is provided on the surface of the cabinet door (2).

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