The Grid Relay Panel typically includes a set of relays, which are used to connect and disconnect the DERs to the grid. The panel also includes a control system that monitors the status of the DERs and the grid, and makes decisions about when to connect and disconnect the DERs based on various parameters such as voltage, frequency, and power.
The panel also includes metering devices, such as ammeters and voltmeters, that can be used to monitor the electrical usage and identify any potential issues. It also includes protection devices, such as overcurrent protection, earth-fault protection, and residual current protection, that are designed to protect the DERs and the grid from damage in case of faults or overloads.
In summary, Grid Relay Panel is a device used to protect and control the connection of distributed energy resources (DERs) such as solar panels, wind turbines, and other renewable energy sources to the electrical grid. It typically includes relays, control system, metering devices and protection devices to monitor the power supply, protect the DERs and the grid from damage, and ensure safe and controlled connection and disconnection of DERs to the grid.