Photovoltaic grid connected access box (also known as photovoltaic grid connected cabinet, grid connected box) is the core distribution equipment of photovoltaic power generation system, which undertakes the functions of energy collection, distribution, control and safety protection, ensuring the reliable connection between photovoltaic system and power grid.
Electricity Control
Collection and distribution: Integrate multiple inverter output currents, converge them, and deliver them to the grid or load, supporting single/multiple input/output configurations.
Anti backflow control: Real-time monitoring of current direction to prevent voltage fluctuations or measurement abnormalities caused by photovoltaic residual electricity flowing back into the grid, meeting the mandatory requirements of the national standard GB/T 38946-2020.
Multi Protection System
Electrical protection: Configure circuit breakers and fuses to cope with short circuits/overloads; The residual current device (RCD) detects 30mA leakage current and trips to prevent electric shock.
Lightning protection and islanding protection: Surge protectors (SPDs) suppress lightning overvoltage. The anti-islanding device automatically disconnects the photovoltaic system when the power grid is cut off, ensuring maintenance safety.
Self-reset protection: The overvoltage and undervoltage protector cuts off the circuit when the voltage is abnormal, and automatically recloses after returning to normal.
Distributed photovoltaic system: rooftop power station, rural power grid renovation project, supporting pole-type transformers to save space;
Industrial and commercial power stations: grid connection control and anti-backflow management of rooftop photovoltaics in factories and shopping malls;
Microgrid system: Histe intelligent cable branch box is engineered with integrated islanding detection and parallel/off-grid switching functions, providing enhanced energy autonomy and grid independence.
Compliance standards: GB 7251.12-2013, IEC 61439.2
The photovoltaic grid-connected access box has become the core hub for the safe and efficient operation of photovoltaic systems through integrated protection and intelligent control.
