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Characteristics of low voltage photovoltaic grid connected cabinet

■ the switchgear is divided into metal enclosed independent compartments such as circuit breaker room, bus room, cable room and control instrument room, in which the circuit breaker room, bus room and cable room have independent pressure relief channels; The frame and shell have sufficient stiffness and strength, which can not only meet the installation requirements of internal components, but also bear the electrodynamic force and thermal effect of internal and external circuit short circuit of the equipment, and will not be deformed and damaged due to damp, freezing, impact and other factors during equipment handling, hoisting and transportation.

■ it has reclosing, voltage loss tripping, overcurrent tripping and other functions to realize unmanned management;

■ an independent lead sealed metering room is reserved to make photovoltaic power generation clear at a glance;

■ it has RS485 communication interface and uses Modbus RTU communication protocol;

■ components from well-known brands at home and abroad can be used according to customer needs;

performance parameter

Functions of MV photovoltaic grid connection cabinet

■ the grid connection system is composed of microcomputer integrated protection device and vacuum circuit breaker. The system has the functions of closing locking, protection closing, local closing, local opening, protection tripping and circuit monitoring, which can stably integrate the electric energy from the photovoltaic power station into the power grid, isolate the photovoltaic power station and the power grid for protection, and prevent cross influence; On the other hand, the system has complete functions and is convenient for maintenance and installation.

■ the microcomputer integrated protection device has the functions of over-current, quick break, three-phase reclosing, fault recording, low-frequency and low-voltage load shedding, accident record not disappearing after power failure, measurement and control, timing and so on. In case of over-current and other faults, the circuit breaker can be quickly tripped, which well protects the lines and devices from damage, and can automatically reclose after fault recovery to realize unmanned management. ■ anti islanding protection device has passive islanding detection, overvoltage and undervoltage protection, high and low frequency protection, reverse power protection, etc. Through the comprehensive judgment of voltage and frequency, the distributed power station can be separated from the power grid in time to avoid the formation of island state. At the same time, it has intelligent communication function, which can communicate and network with the background system, remotely operate the opening and closing of the circuit breaker, and remotely view various electrical parameters and switch position information of the grid connected cabinet.

■ the medium voltage photovoltaic grid connected cabinet is equipped with intelligent control device, which has the functions of one-time dynamic simulation indicator diagram + Voice error prevention prompt + temperature and humidity control + high-voltage live display and locking + energy storage, remote / local, opening / closing, lighting operation in the cabinet, etc., so that the operation state of the cabinet can be seen intuitively.

■ electricity metering

The photovoltaic grid connected cabinet can be equipped with a metering bin with a lead sealing device, which can effectively prevent power theft. Metering devices and load control devices (usually provided by local power supply bureau) can be installed in the metering warehouse, which can record the power generation well.

■ when the photovoltaic power generation system has a fault on its own side and the grid side is normal, it needs to be overhauled by relevant staff. At this time, the photovoltaic grid connected equipment can effectively prevent the reverse transmission of power from the grid side to the photovoltaic side, thus ensuring the photovoltaic side overhaul personnel

Safety of personnel.