The photovoltaic grid-connected cabinet is a power distribution device connecting the photovoltaic power station and the power grid, and its main role is to serve as the boundary between the photovoltaic power station and the power grid.

It is used for the power distribution equipment used in the grid-connected point of the photovoltaic power generation system (between the inverter and the power grid) and the power grid, which can protect and measure the total amount of photovoltaic power generation, facilitate fault maintenance and management, and improve the safety and economic benefits of the power generation system.

Technical features:

1. The box of the photovoltaic grid-connected cabinet should have sufficient mechanical strength and not be deformed during transportation and installation. The shell paint is evenly sprayed and has the characteristics of sun resistance, corrosion resistance, and firm anti-adhesion.

2. The box of the photovoltaic grid-connected cabinet is made of metal material, which has the characteristics of anti-exposure to sunlight, not easy to conduct heat, anti-weathering and corrosion, and anti-mechanical impact. The metal frames of the switchgear are all well grounded, with at least 2 grounding terminals and marked with obvious protective grounding symbols.

3. The photovoltaic grid-connected box should be able to introduce cables from the bottom.

4. The design of the photovoltaic grid-connected cabinet meets the requirements of natural ventilation, and the heat dissipation performance is good, which is convenient for on-site installation. The four corners of the cabinet roof are equipped with detachable lifting rings. The cabinet body is made of cold-rolled steel plate with a thickness of not less than 2mm.

5. The doors and partitions of photovoltaic grid-connected cabinets are sprayed with electrostatic epoxy plastic and treated with orange grain to eliminate glare.

6. The connection of the bus bar should be made of anti-corrosion bolts, nuts and casings. The busbar should be arranged and marked according to the provisions of the national standard (GB).

7. The temperature rise of the components in the photovoltaic grid-connected cabinet should not exceed the allowable temperature rise limit of the standard adopted.

8. In addition to meeting the parameter requirements of the wood circuit, the components in the photovoltaic grid-connected cabinet should also ensure safe and reliable operation under the specified rated conditions, and its installation should be easy to inspect and maintain.

9. The grid-connected cabinet is separately equipped with a metering room, a built-in two-way smart meter mounting bracket, a negative control mounting bracket, and the upper and lower spaces of the meter meet the relevant requirements. The metering room opens separately, can be sealed, with a transparent observation window to observe the meter reading, and a sensor cable hole (diameter 60mm) is reserved in a suitable position.

10. The circuit breaker of the photovoltaic grid-connected cabinet has an under-voltage tripping function, the voltage is set by 70%, and the one-to-one opening and closing contacts are reserved, and the switching status indication, voltage and current indication are set.

11. The lightning protection module has the function of overheating and overcurrent protection. The lightning protection module can be automatically and permanently disconnected after deterioration.

12. Provide the internal schematic diagram, wiring diagram and installation schematic diagram of the photovoltaic grid-connected cabinet.

13. Provide the internal schematic diagram, wiring diagram and installation schematic diagram of the grid-connected cabinet.

14. The photovoltaic grid-connected cabinet requires the installation of corresponding circuit breaker intervals and reserved installation space (the design drawings are confirmed by the buyer).

15. Set up the bus room and open the door separately (the design drawings are confirmed by the buyer).

16. The schematic diagram and installation icon number should be marked with the schematic diagram and the wiring of the secondary equipment, and the label should be correct, complete, clear and firm.

17. The installation position of the terminal row of the secondary circuit corresponds to the primary wiring, and it is necessary to fully consider the convenience of user installation wiring and maintenance.

18. The secondary wire is made of flame-retardant multi-strand copper core plastic wire.

19. The secondary circuit of the photovoltaic grid-connected cabinet bears the 2kV power frequency withstand voltage test without destructive discharge.

20. All control wiring and terminals in and out of the DC distribution cabinet shall be marked with wiring, and the text and number of the mark shall be consistent with that on the control schematic diagram. All wiring markings are made of flame retardant material.

21. The main circuit of wiring should be marked with colors and words specified in the national standard.

Use environment

Ambient air temperature: -5°C to +40°C, with an average temperature of no more than 35°C over a 24-hour period

Outdoor installation and use, the altitude does not exceed 2000m

The relative humidity of the surrounding air does not exceed 50% at the maximum temperature of +40°C, and higher humidity is allowed at lower temperatures (e.g., RH90% at 20°C), and the effects of occasional condensation due to temperature changes should be considered.

The device is installed with an inclination of no more than 5º to the vertical plane

The equipment should be installed in a place where there is no severe vibration and shock, and where the components are not sufficient to be corroded

When the user has special requirements, negotiate with the manufacturer to solve them.

Reasons for choosing grid-connected cabinets

●When there are voltage, frequency, overload and other related conditions on the photovoltaic side, which causes potential danger to the equipment of the station and has an impact and impact on the power grid side, the photovoltaic anti-island protection device can quickly issue a command to the grid-connected switch to trip the time, so as to quickly remove the fault circuit.

●When there is a fluctuation in voltage and frequency on the power grid side that causes an impact on the station, the photovoltaic anti-island protection device can also quickly collect relevant signals, and can quickly issue orders to command the grid-connected switch to trip.

●When there is a fault on this side, and there is electricity on the power grid side, the relevant staff needs to be repaired, and the equipment can effectively prevent the power grid side from transmitting power to the side, so as to ensure the life safety of the maintenance personnel of the photovoltaic power station