In recent years, photovoltaic has developed rapidly, and as a leading industry of new energy, it has gradually come to our lives. Among them, the ground photovoltaic is mainly installed in mountains, deserts, next door and other areas, making full use of the desolate land. The distributed photovoltaic power station is mainly installed on the roof, the roof or the top of the agricultural shed of the factory.

Compared with the centralized photovoltaic power station on the ground, the distributed photovoltaic power station is relatively small, but relatively dispersed, in general, the grid-connected voltage level is 380V, in this low-voltage grid-connected case, generally in the secondary computer protection involved less, usually distributed photovoltaic power station used computer protection is anti-island protection device, the device is installed in the grid-connected cabinet. For this reason, the use of distributed grid-connected cabinets is widely used in distributed photovoltaic power stations. As shown in the picture below: