| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground fault detector capable of detecting an earth fault during an autonomous operation.SOLUTION: The ground fault detector includes a ground fault detection circuit 12 which determines the presence/absence of a ground fault in a photovoltaic power generation system 100 on the basis of a detection result from a zero-phase-sequence current transformer 3, which detects a ground fault current of the photovoltaic power generation system 100; a controller 13 which implements controls for changing decision criteria for a ground fault in the ground fault detection circuit 12 during interconnection operation and autonomous operation.SELECTED DRAWING: Figure 1 |
