Distributed Pv Low-voltage Grid-connected Cabine
Photovoltaic grid-connected cabinet is mainly used for grid-connected power supply system of photovoltaic power station. It is mainly composed of anti-island protection device, isolating knife switch, grid-connected Circuit Breaker, lightning arrester, temperature and humidity controller, electric energy metering device and cabinet accessories. Cabinet type and cabinet size are customized for MNS,GCS,GCK,GGD according to the site situation.
Main components in the cabinet: isolation switch, grid-connected circuit breaker, input circuit breaker, intelligent digital display meter, current Transformer, lightning protection circuit breaker, surge protector, anti-island protector, metering transformer, metering watt-hour meter.
The photovoltaic grid-connected cabinet is an important part of undertaking centralized inverters and step-up transformers or AC combiner boxes and step-up transformers. The incoming line of this photovoltaic grid-connected cabinet adopts circuit breaker input or direct input, and the output adopts circuit breaker or load Isolation switch, the busbar is connected by electroplating or purified busbar, and provides secondary lightning protection. The rated voltage of the system is up to AC690V, and the protection level is IP40 indoors and IP65 outdoors; the secondary measurement and Control Cables, the current is greater than The cable of 2.5mm², the cable with the voltage of 1.5mm², the control cable of greater than 1.0mm², the measuring current transformer is the current transformer of class 0.5, and the measuring transformer is the current transformer of class 0.2S. It can also add related functions according to customer requirements. This product adopts professional electrical design and component selection, which makes the internal structure of the cabinet safe, concise, beautiful, convenient for on-site wiring and maintenance, and ensures the stable operation of the equipment for a long time.
The role of low-voltage photovoltaic grid cabinet.
■ When the Photovoltaic Power Generation system outgoing voltage, frequency, overload and other abnormal conditions, the site equipment threat or impact on the power grid side, photovoltaic anti-island device can quickly send a tripping command to the grid-connected circuit breaker, quickly remove the fault circuit. When the power grid voltage returns to normal after troubleshooting, the anti-island protection device will automatically close the grid-connected circuit breaker when the monitoring is normal.
■ When the power grid side outgoing voltage, frequency, overload and other abnormal conditions, the impact and impact of the site equipment, photovoltaic anti-island device can also quickly monitor and issued a tripping command to the grid-connected circuit breaker, so as to quickly disconnect the grid-connected switch, prevent island effect.
■ When the photovoltaic power generation system on the side of the failure, and the power grid side is normal, this matter needs related staff maintenance, this matter photovoltaic grid-connected equipment can effectively prevent the grid side of the photovoltaic side back power, so as to ensure the safety of the photovoltaic side maintenance personnel.
The function of photovoltaic grid-connected cabinet.
■ Protection function
The anti-islanding device has passive islanding detection, voltage automatic closing, over and under voltage protection, high and low frequency protection, inverse power protection, etc.
■ Automatic grid connection
The anti-islanding protection device has the functions of voltage loss trip (power grid voltage loss) and voltage automatic reclosing. When the voltage is abnormal, the trip and voltage return to normal can automatically connect and close the network. At the same time has the intelligent communication function, can communicate with the background system networking, remote operation circuit breaker open and close, remote view of the grid cabinet various electrical parameters and switch location information.
■ Electricity measurement
Pv Grid-Connected Cabinet can be equipped with metering warehouse, metering warehouse with lead sealing device, can effectively prevent electricity theft. The metering bin can be installed with metering devices and negative control devices (generally provided by the local power supply bureau), which can be a good record of power generation.
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