| 摘要 |
PURPOSE:To enhance the safety factor of a maintenance work of a line at a power interruption time by disconnecting the existing power system when the amplitudes of an inverter current and a load current have the prescribed relationship. CONSTITUTION:The DC output of a solar battery 1 is converted by an inverter 2 into an AC, and supplied through a switch 5 to a load 4. The power of the existing power system 3 is supplied through a switch 6 to the load 4. The inverter current and the load current are respectively detected by AC units 7, 8, and input through current/voltage converters 9, 10 to a comparator 11. The comparator 11 opens the switch 6 when the load current is equal to or higher than the inverter current to disconnect the power system 3. |
