CN223967540U

CN223967540U - Photovoltaic grid-connected box

Info

Publication number: CN223967540U
Application number: CN202423144853.0U
Authority: CN
Inventors: 袁秀文; 李晓东; 张志鹏; 李科; 艾军
Original assignee: Chengdu Qingdian Yi New Energy Co ltd
Current assignee: Chengdu Qingdian Yi New Energy Co ltd
Priority date: 2024-12-19
Filing date: 2024-12-19
Publication date: 2026-03-03
Anticipated expiration: 2034-12-19

Abstract

This utility model discloses a photovoltaic grid-connected box, comprising a mechanical part and an electrical part. The mechanical part is used to install the electrical part and includes a box body with vertical partitions dividing the interior of the box into left and right sections. One side of the vertical partition is an inlet compartment, and the other side of the box body is horizontally divided into an instrument compartment and an outlet compartment arranged vertically. The inlet compartment has an inlet door, the instrument compartment has an instrument door, and the outlet compartment has a cable compartment door. All the inlet door, instrument door, and cable compartment door are located on the front of the box body. This utility model has a simple and reasonable structure, and is safe and reliable. It also has anti-islanding protection and power quality detection functions.

Description

Photovoltaic grid-connected box

Technical Field

The utility model relates to the technical field of power transmission and distribution, in particular to a photovoltaic grid-connected box.

Background

The photovoltaic grid-connected box is mainly used for grid-connected protection of distributed photovoltaic power station projects, is generally connected to the outlet end of a household photovoltaic inverter, performs overvoltage and undervoltage, overcurrent, short circuit and electric leakage protection on the whole line, and meanwhile measures photovoltaic grid-connected electric energy through a built-in metering ammeter.

Most of the existing photovoltaic grid-connected boxes are in box type and cabinet type, and all components are placed in the common grid-connected boxes, so that the photovoltaic grid-connected boxes are not separated, the photovoltaic power generation is unstable, and accidents are easy to occur. Moreover, the grid-connected power of the existing photovoltaic grid-connected box is smaller, the grid-connected box needs to be made with larger power, the photovoltaic voltage is unstable, and if accidents occur, the use of subsequent equipment is easily affected.

Disclosure of utility model

In order to overcome the defects, the utility model aims to provide the photovoltaic grid-connected box, which is simple and reasonable in structure, safe and reliable, and the three compartments are separated.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the photovoltaic grid-connected box comprises a mechanical part and an electrical part, wherein the mechanical part is used for installing the electrical part, and the mechanical part comprises a box body and is characterized in that the box body is provided with a vertical partition board which divides the inside of the box body left and right, one side of the vertical partition board is a wire inlet chamber, and the box body part on the other side of the vertical partition board is transversely divided into an instrument chamber and a wire outlet chamber which are arranged up and down;

The inlet wire room sets up inlet wire room door, instrument room sets up the instrument door, the room of being qualified for the next round of competitions sets up cable chamber door, inlet wire room door, instrument door, cable chamber door all are located the box openly.

Preferably, the incoming line room door, the instrument door and the cable room door are all positioned on the front surface of the box body and are hinged with the side wall of the box body.

Preferably, the electric part comprises an arc-proof island protection unit and an electric energy quality detection unit, and the arc-proof island protection unit and the electric energy quality detection unit are embedded in the instrument door.

Further, an observation window is arranged on the instrument door.

Further, the electrical portion further includes a micro-grid controller.

Preferably, the electric part further comprises a plastic shell circuit breaker and an automatic reclosing circuit breaker, one side of the plastic shell circuit breaker is used for being connected with an incoming line of the inverter, and the other side of the plastic shell circuit breaker is converged to the automatic reclosing circuit breaker through an incoming line copper bar.

Preferably, the automatic reclosing circuit breaker is connected with the breaking circuit breaker through a soft copper wire, and the breaking circuit breaker is connected with the knife switch through a soft copper wire.

Further, an insulator, a zero row and a ground row are arranged in the incoming line chamber, and a transformer is arranged in the outgoing line chamber.

Preferably, the automatic reclosing circuit breaker is a photovoltaic special-purpose under-voltage automatic reclosing circuit breaker with detection, and the plastic shell circuit breaker is a photovoltaic special-purpose bidirectional conduction.

Further, a guide rail for installing the control relay is arranged on the side wall in the incoming line chamber.

The beneficial effects of the utility model are as follows:

1. the utility model has simple and reasonable structure, safety and reliability.

2. The utility model has the island prevention protection and electric energy quality detection functions.

3. The utility model adopts the special automatic reclosing breaker for the photovoltaic, and can effectively protect the circuit breaker.

Drawings

FIG. 1 is an expanded schematic view of the present utility model.

Fig. 2 is an electrical schematic of the present utility model.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

Examples

The embodiment discloses a photovoltaic grid-connected box, wherein a power quality detection device and an anti-islanding protection unit are arranged in the box, an inverter incoming line is provided with a plastic shell breaker, and is converged to an automatic reclosing breaker, namely a photovoltaic special automatic reclosing breaker with voltage detection, the plastic shell breaker is in bidirectional conduction special for the photovoltaic, the plastic shell breaker is connected with a copper bar, and a breaking breaker is connected with the automatic reclosing breaker and the automatic reclosing breaker is connected with a soft copper wire for a disconnecting link, so that the use space can be effectively saved. The knife switch annealed copper wires are connected with the copper bars and are led out from the compartments.

Specifically as shown in fig. 1, the box is divided into two parts by a vertical partition board 4, one side of the vertical partition board 4 is an inlet wire chamber 1, the other side of the vertical partition board 4 is divided into an instrument chamber 2 and an outlet wire chamber 3 up and down, and the box further comprises a back plate 5 and a side plate 6. The incoming line room 1 is provided with an incoming line room door, namely a breaker door plate 19, the instrument room 2 and the outgoing line room 3 are respectively provided with an instrument door 29 and a cable room door 28, the arc-proof island protection unit 24 and the electric energy quality detection unit 27 are embedded on the instrument door 29, the instrument door 29 is provided with an observation window 25, the instrument door 29 is provided with a door lock 26, the instrument door 29 is connected with the side plate 6 through a hinge 22, the instrument room 2 is provided with a mounting plate 210, the mounting plate 210 is fixed on the back plate 5, and the mounting plate 210 is used for mounting the junction box 21.

The wire inlet chamber 1 is internally provided with a ground row 11, a zero row 12, an insulator 13, a molded case circuit breaker 14, a fuse 15, a first copper row 17, an automatic reclosing circuit breaker 110 (namely, a photovoltaic special-purpose under-voltage automatic reclosing circuit breaker), a disconnecting link 111, a micro-breaking 115 and a guide rail 113 for installing a control relay 114, wherein the fuse 15 and the micro-breaking 115 are installed on an installation guide rail 16, and an indicator lamp 18 is arranged on a circuit breaker door plate 19.

A second copper bar 31 and a current transformer 32 are arranged in the outlet chamber 3.

Examples

On the basis of the embodiment 1, the micro-grid controller is added in the embodiment, so that real-time data monitoring, data analysis and breaker opening and closing condition control are realized.

Examples

As shown in FIG. 2, on the basis of the embodiment 1, the embodiment discloses a practical application of the photovoltaic grid-connected box, wherein QS is an isolating switch, the model is NH40-315/4,1QF is an automatic reclosing device, the specification is 250A/4P, TAa-TAc is a current transformer, the model is LMZ2D-0.66 300/5,0.2S level, WH is a metering kilowatt-hour meter, 2QF and 3QF are molded case fuses, the 2QF specification is 63A/3P, the 3QF specification is 80A/3P, the 3QF is a micro fuse, the specification is 4P C32A, the SPD is a surge protector and the T1 level.

Of course, the present utility model is capable of other various embodiments and its several details are capable of modification and variation in light of the present utility model by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

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, the mechanical part including a box body, characterized in that: the box body is provided with a vertical partition, the vertical partition divides the interior of the box body into left and right sections, one side of the vertical partition is an inlet chamber, and the other side of the box body is horizontally divided into an instrument chamber and an outlet chamber 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 incoming line door, the instrument door, and the cable door are all located on the front of the box and are hinged to the side wall of the box.

3. The photovoltaic grid-connected box according to claim 1, characterized in that: the electrical part includes an anti-arc island protection unit and a power quality detection unit, wherein the anti-arc island protection unit and the power quality detection unit are both embedded in the instrument door.

4. The photovoltaic grid-connected box according to claim 3, characterized in that: the instrument door is provided with an observation window.

5. The photovoltaic grid-connected box according to claim 1, wherein the electrical part further includes a microgrid controller.

6. The photovoltaic grid-connected box according to any one of claims 1-5, characterized in that: the electrical part further includes 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 through the input copper busbar.

7. The photovoltaic grid-connected box according to claim 6, characterized in that: the automatic reclosing circuit breaker and the circuit breaker, and the 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 provided with an insulator, a neutral busbar and a ground busbar, and the outgoing line chamber is provided 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: a guide rail for installing a control relay is arranged on the side wall of the incoming line chamber.