Photovoltaic grid-connected box
By dividing the photovoltaic grid-connected box into an incoming line room, an instrument room, and an outgoing line room, and by adopting anti-arc island protection and a power quality detection unit, the problem of easy accidents in existing photovoltaic grid-connected boxes has been solved, and safe and reliable photovoltaic grid-connected protection and power quality detection have been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2026-03-03
AI Technical Summary
The existing photovoltaic grid-connected box structure does not have separate compartments, which makes the components prone to accidents, and the grid-connected power is low and the voltage is unstable, affecting the use of subsequent equipment.
Design a photovoltaic grid-connected box, which is divided into an incoming line room, an instrument room and an outgoing line room. It has a built-in anti-arc island protection unit and a power quality detection unit, and uses photovoltaic-specific automatic reclosing circuit breakers and molded case circuit breakers, and optimizes the component layout.
A simple, safe, and reliable photovoltaic grid-connected box has been developed, featuring anti-islanding protection and power quality detection functions, thus improving the stability and protection capabilities of the equipment.
Smart Images
Figure CN223967540U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power transmission and distribution technology, and in particular to a photovoltaic grid-connected box. Background Technology
[0002] Photovoltaic grid-connected boxes are mainly used for grid-connected protection of distributed photovoltaic power station projects. They are generally connected to the output terminal of household photovoltaic inverters to provide over-voltage, under-voltage, over-current, short-circuit, and leakage protection for the entire line. At the same time, they have built-in meters to measure the photovoltaic grid-connected power.
[0003] Most existing photovoltaic grid-connected boxes are box-type or cabinet-type, and are generally placed indoors, with all components stored together without partitions. This makes photovoltaic power generation unstable and prone to accidents. Furthermore, the grid-connected power of existing photovoltaic grid-connected boxes is relatively small; larger power requires a grid-connected cabinet. Also, the photovoltaic voltage itself is unstable, and accidents can easily affect the use of subsequent equipment. Utility Model Content
[0004] To overcome the above-mentioned defects, this utility model aims to provide a photovoltaic grid-connected box, which is divided into three compartments, with a simple and reasonable structure, and is safe and reliable.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A photovoltaic grid-connected box includes a mechanical part and an electrical part. The mechanical part is used to install the electrical part. The mechanical part includes a box body. The box body is characterized by having vertical partitions arranged on it, which divide the interior of the box body into left and right sections. One side of the vertical partition is an inlet room, and the other side of the box body is horizontally divided into an instrument room and an outlet room arranged vertically.
[0007] The incoming line compartment is equipped with an incoming line compartment door, the instrument compartment is equipped with an instrument door, and the outgoing line compartment is equipped with a cable compartment door. The incoming line compartment door, the instrument door, and the cable compartment door are all located on the front of the enclosure.
[0008] Preferably, the inlet door, instrument door, and cable door are all located on the front of the enclosure and are hinged to the side wall of the enclosure.
[0009] Preferably, the electrical components include an anti-arc island protection unit and a power quality detection unit, both of which are embedded in the instrument door.
[0010] Furthermore, the instrument panel door is equipped with an observation window.
[0011] Furthermore, the electrical components also include a microgrid controller.
[0012] Preferably, the electrical components further include a molded case circuit breaker and an automatic reclosing circuit breaker. One side of the molded case circuit breaker is used to connect to the inverter input line, and the other side of the molded case circuit breaker is connected to the automatic reclosing circuit breaker via an input copper busbar.
[0013] Preferably, the automatic reclosing circuit breaker and the tripping circuit breaker, and the tripping circuit breaker and the switch are connected by soft copper wire.
[0014] Furthermore, the incoming line chamber is equipped with insulators, a neutral busbar, and a ground busbar, while the outgoing line chamber is equipped with a current transformer.
[0015] Preferably, the automatic reclosing circuit breaker is a photovoltaic-specific automatic reclosing circuit breaker with detection and voltage, and the molded case circuit breaker is a photovoltaic-specific bidirectional circuit breaker.
[0016] Furthermore, guide rails for mounting control relays are arranged on the side wall of the incoming line chamber.
[0017] The beneficial effects of this utility model are as follows:
[0018] 1. This utility model has a simple and reasonable structure and is safe and reliable.
[0019] 2. This utility model has anti-islanding protection and power quality detection functions.
[0020] 3. This utility model uses a photovoltaic-specific automatic reclosing circuit breaker, which can effectively protect the circuit. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the unfolded form of this utility model.
[0022] Figure 2 This is the electrical schematic diagram of this utility model. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings. Example
[0024] This embodiment discloses a photovoltaic grid-connected box, which is equipped with a power quality detection device and an anti-islanding protection unit. The inverter's incoming line is equipped with a molded case circuit breaker and is connected to an automatic reclosing circuit breaker—a photovoltaic-specific voltage-controlled automatic reclosing circuit breaker. The molded case circuit breaker is a photovoltaic-specific bidirectional conductor and is connected by copper busbars. The circuit breakers and the automatic reclosing circuit breaker, as well as the automatic reclosing circuit breaker and the disconnect switch, are connected by flexible copper wires, which can effectively save space. The flexible copper wires of the disconnect switch are connected to the copper busbars and exit from the compartment.
[0025] Specifically, such as Figure 1As shown, the enclosure is divided into two parts by a vertical partition 4. One side of the vertical partition 4 is the inlet compartment 1, and the other side of the vertical partition 4 is divided vertically into an instrument compartment 2 and an outlet compartment 3. The enclosure also includes a back panel 5 and a side panel 6. The inlet compartment 1 is equipped with an inlet compartment door, i.e., a circuit breaker door panel 19. The instrument compartment 2 and the outlet compartment 3 are respectively equipped with an instrument door 29 and a cable compartment door 28. The arc protection unit 24 and the power quality detection unit 27 are both embedded in the instrument door 29. The instrument door 29 is equipped with an observation window 25 and a door lock 26. The instrument door 29 is connected to the side panel 6 by a hinge 22. The instrument compartment 2 is equipped with a mounting plate 210, which is fixed to the back panel 5. The mounting plate 210 is used to install the junction box 21.
[0026] The incoming line compartment 1 is equipped with a ground busbar 11, a neutral busbar 12, an insulator 13, a molded case circuit breaker 14, a fuse 15, a first copper busbar 17, an automatic reclosing circuit breaker 110 (i.e., a photovoltaic-specific automatic reclosing circuit breaker with voltage detection), a knife switch 111, a miniature circuit breaker 115, and a guide rail 113 for installing the control relay 114. The fuse 15 and the miniature circuit breaker 115 are installed on the mounting guide rail 16, and an indicator light 18 is provided on the circuit breaker door panel 19.
[0027] The outgoing line compartment 3 is equipped with a second copper busbar 31 and a current transformer 32. Example
[0028] Based on Example 1, this example adds a microgrid controller to realize real-time monitoring of data, data analysis, and control of circuit breaker opening and closing status. Example
[0029] like Figure 2 As shown, based on Example 1, this example discloses a practical application of this type of photovoltaic grid-connected box, wherein: QS is a disconnecting switch, model NH40-315 / 4; 1QF is an automatic reclosing device, specification 250A / 4P; TAa~TAc are current transformers, model LMZ2D-0.66 300 / 5, 0.2S class; WH is a metering electricity meter; 2QF and 3QF are molded case fuses, 2QF specification 63A / 3P, 3QF specification 80A / 3P, 3QF QF is a miniature fuse, specification 4P C32A; SPD is a surge protector, T1 class.
[0030] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.
Claims
1. A photovoltaic grid-connected box, comprising a mechanical part and an electrical part, wherein the mechanical part is used to install the electrical part, and the mechanical part includes a box body, characterized in that: The enclosure is equipped with vertical partitions, which divide the interior of the enclosure into left and right sections. One side of the vertical partition is the inlet room, and the other side of the enclosure is horizontally divided into an instrument room and an outlet room arranged vertically. The incoming line compartment is equipped with an incoming line compartment door, the instrument compartment is equipped with an instrument door, and the outgoing line compartment is equipped with a cable compartment door. The incoming line compartment door, the instrument door, and the cable compartment door are all located on the front of the enclosure.
2. The photovoltaic grid-connected box according to claim 1, characterized in that: The inlet door, instrument door, and cable door are all located on the front of the enclosure and are hinged to the side wall of the enclosure.
3. The photovoltaic grid-connected box according to claim 1, characterized in that: The electrical components include an anti-arc island protection unit and a power quality detection unit, both of which are embedded in the instrument panel door.
4. The photovoltaic grid-connected box according to claim 3, characterized in that: The instrument panel door is equipped with an observation window.
5. The photovoltaic grid-connected box according to claim 1, characterized in that: The electrical components also include a microgrid controller.
6. The photovoltaic grid-connected box according to any one of claims 1-5, characterized in that: The electrical components also include a molded case circuit breaker and an automatic reclosing circuit breaker. One side of the molded case circuit breaker is used to connect to the inverter input line, and the other side of the molded case circuit breaker is connected to the automatic reclosing circuit breaker via an input copper busbar.
7. The photovoltaic grid-connected box according to claim 6, characterized in that: The automatic reclosing circuit breaker and the opening circuit breaker, and the opening circuit breaker and the switch are connected by soft copper wire.
8. The photovoltaic grid-connected box according to claim 1, characterized in that: The incoming line chamber is equipped with insulators, a neutral busbar, and a ground busbar, while the outgoing line chamber is equipped with a current transformer.
9. The photovoltaic grid-connected box according to claim 6, characterized in that: The automatic reclosing circuit breaker is a photovoltaic-specific automatic reclosing circuit breaker with detection and voltage, and the molded case circuit breaker is a photovoltaic-specific bidirectional circuit breaker.
10. The photovoltaic grid-connected box according to claim 1, characterized in that: The side wall of the incoming line chamber is provided with guide rails for installing control relays.