Circuit for connecting an energy generation unit to the power grid

摘要

A connection node is connected to a customer generation system (5), an automatic disconnection switch with two switches (411, 412), and a second switch (44) connected to several loads (6). A second connection node (9) is connected to third (43) and fourth switches (45). A third connection node connects the first and third switches to a utility grid (1). Customer generation system supplies alternating current (AC) voltage that can be added to a circuit in parallel to the utility grid. A grid monitoring device opens the first switch upon failure of the utility grid. An independent claim is included for a method of operating a backup power system.