| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground fault detection system and a ground fault detection method, capable of detecting ground faults appropriately, and of securing the system stability, in an inverter interconnecting a plurality of DC power supplies to a common AC power supply.SOLUTION: In inverters INV1-INVn connected to solar battery power generation devices SC1-SCn, a resistive voltage divider VD having resistors R1 and R2 is provided to an input voltage line via a switch SW. To a ground line from a neutral point of the resistive voltage divider VD, a current measurement unit 20 and a ground fault determination part 21 are provided. In the case that a current value equal to or more than a reference value is detected at the ground fault determination part 21, the switch SW is turned off. In addition, to a line integrated to the ground line from the neutral point of the resistive voltage divider VD of the inverters INV1-INVn, a current measurement unit 30 and a ground fault determination part 31 are provided. In the case that a current value equal to or more than a reference value is detected at the ground fault determination part 31, an electromagnetic contactor is turned off and paralleled off. |
