BWG-800 Photovoltaic Grid-Connected Cabinet

Overview

Photovoltaic power station low-voltage grid-connected cabinet, which is a distribution device designed for distributed photovoltaic power generation system, it is mainly used in the AC 800V low-voltage system to ensure that the direct current generated by solar panels can be safely and efficiently converted into the public grid. The cabinet integrates a variety of key components and functions, including but not limited to:

Anti-island protection device: automatically detects and prevents the photovoltaic system from continuing to supply power when the power grid fails, protecting the power grid stability and staff safety.

Isolation knife switch: used to physically disconnect the photovoltaic system from the power grid for easy maintenance and safe isolation.

Grid-connected circuit breaker: Quickly cut off the circuit when the system is abnormal, providing overload and short circuit protection.

Technical parameter

Product model	BWG
Maximum input voltage	800VAC
Rated frequency	50Hz
Maximum rated current	3150A
Measurement data	Three phase current, three phase voltage, active power, apparent power, power factor, frequency, electrical degree
Communication method/protocol	RS485 bus/Standard MODBUS-RTU protocol
Temperature and humidity	Operating temperature: -40~+85℃; Humidity 95%, no condensation, no corrosive gas place
Altitude	≤4000m
Body material protection grade	Hot dip galvanized steel plate/stainless steel/cold rolled steel plate 40
Volume (width×height×depth)	2260mm×800mm×600mm
Installation mode	Floor type

Product characteristics

1. The capacity covers a wide range, which can cover the grid-connected needs of users below 3150A.
2. Light weight, easy installation, beautiful appearance and atmosphere.
3. It can be optional to check the functions of pressure closing, loss of voltage tripping, etc., to achieve intelligent management.
4. Independent lead-sealed measuring room can be reserved, photovoltaic power generation at a glance.
5. The photovoltaic grid-connected cabinet has RS485 communication interface and adopts ModBus-RTU communication protocol.
6. The component combination is flexible, and different brands of components can be selected according to demand, which is convenient for budget.
7. The power quality online monitoring device can be selected to detect the electrical parameters of the photovoltaic power generation system, and communicate with the background online to achieve intelligent management.
8. Anti-isolation protection and reverse power protection are optional.

Technical requirement

Distributed photovoltaic power generation projects should be set at the inverter power output convergence point, easy to operate, can be locked, and has an obvious disconnect point, with ground fault protection of the breaker equipment. In addition to meeting the parameter requirements of the circuit, the components in the AC low-voltage grid-connected cabinet should also ensure safe and reliable operation under the rated conditions specified in the national standard, and its installation should be easy to check and maintain. The measuring current transformer of AC grid-connected cabinet is cast type (user supplied), the secondary current is 5A, and the accuracy of the measuring current transformer is 0.2S. The secondary load of the current transformer (such as an ammeter) is installed in the cabinet. The indicator light adopts anti-interference type long life LED. Fuses are fused tube fuses for protection of control and auxiliary circuits.

The connecting points of distributed power supply should be installed with low-voltage grid-connected special circuit breakers that are easy to operate, have obvious breaking indications, and have the ability to break fault current. Use frame circuit breakers. According to the level of short circuit current, select the breaking ability of the device, and leave a certain margin, and have the ability to reverse the power supply end and the load end.