Structural Composition Of Photovoltaic Grid Connected Boxes

Compared with ground centralized photovoltaic power plants, distributed photovoltaic power plants are relatively small in scale but more dispersed. A general photovoltaic grid box is composed of anti islanding protection devices, low-voltage circuit breakers, air switches, lightning arresters, temperature and humidity heaters, stainless steel boxes, and other equipment. The selection of a circuit breaker depends on the actual current flowing through the circuit breaker, which is generally about 1.2 times the rated current.
The above is a routine. The devices in the distributed parallel cage vary depending on the project. Some projects need to install Electricity meter or other equipment in the parallel cage, depending on the project. Friends often ask where the photovoltaic island protection device is installed, but it is actually very simple. The main functions of island protection devices are high-frequency protection, low-frequency protection, high-voltage protection, low-voltage protection, and reverse power protection. When the island protection device detects a fault, it will trip the grid connected circuit breaker.
Therefore, installing anti islanding protection devices in grid connected cabinets is the most suitable. It should be noted that the island protection device is one of the microcomputer protection devices, and it also needs to be debugged and tested during use. The setting of protection settings requires at least on-site electrical debugging personnel to set according to the protection settings provided by relevant departments. If there is no set value, then the protective device is useless.