Photovoltaic box - type substation is a key equipment in photovoltaic power generation systems, mainly used to step up low - voltage electrical energy for grid connection. Here is a detailed introduction:

Structure and Composition

- High - voltage chamber: It adopts an integral compartment form, which is divided into an incoming line unit and an outgoing line unit. The incoming line is connected to the municipal power grid, and the outgoing line is connected to the high - voltage side of the transformer.

- Low - voltage chamber: It usually consists of two cabinets, one is the incoming line unit, and the other is the control unit. The incoming line unit is equipped with a three - stage fixed - type frame circuit breaker, and the lower part is connected to the inverter. The control unit mainly installs weak - current and control components of the box - type substation, such as the measurement and control device, which transmits real - time data of the box - type substation to the background.

Characteristics

- Advanced technology and safety: The shell is made of aluminum - zinc steel plate, and the frame adopts standard container materials and production processes, with good anti - corrosion performance. The internal equipment adopts fully - enclosed high - voltage switchgear, dry - type transformers, vacuum switches, etc., which have a fully - enclosed and fully - insulated structure, ensuring safe operation.

- High degree of automation: The protection system adopts a substation micro - computer integrated automation device, which can realize "four remotes", namely remote measurement, remote communication, remote control, and remote signaling. Each unit has an independent operation function, and the relay protection function is complete.

- Factory pre - fabrication: All equipment is installed and debugged in the factory at one time, which shortens the design and manufacturing cycle. On - site installation only requires box positioning, cable connection, protection value verification, and other commissioning work, which shortens the construction period.

- Flexible combination mode: Each box constitutes an independent system, and the combination mode is flexible and changeable. Users can freely combine according to the actual situation to meet the needs of safe operation.

- Small footprint: It only takes up 1/10 of the area of a substation of the same scale, which can make full use of corners and other places, in line with the national policy of saving land.