Interconnection circuit between external grid power supply and self-generated power supply

This circuit has the following three characteristics: the external power supply is not involved in the self-generated power generation. When there is both
external power supply and self-generated power generation, the external power supply will only be connected to the load and will not cause an accident; when the external power supply fails, the self-prepared power generation will
After the power generation is connected and used, when the external power supply resumes power supply , the switching of the power supply circuit can be automatically realized, and
the power supply of each power generation unit can be automatically cut off and notified to stop, and the external power supply can be connected for operation; phase loss protection can be realized, regardless of the external power supply. If the power supply or
self-generated power supply occurs, if a phase loss occurs or the main circuit fuse blows, the power supply
can be cut off automatically to avoid the harm caused by phase loss operation .