| 摘要 |
A line-to-ground fault location detector (15) detects, based on a difference between a current flowing from a power transmission circuit (13) to a load circuit (16), and a current flowing from the load circuit (16) to the power transmission circuit (13), whether a line-to-ground fault is occurring at a power-transmission-circuit side or a load-circuit side. A contactor controller opens a first contactor (12) when the load circuit (16) detects the occurrence of the line-to-ground fault, and when a line-to-ground fault location detector (15) detects that a location of the line-to-ground fault is at the power-transmission-circuit side, the contactor controller maintains the open state of the first contactor (12) even if an operation to instruct closing of the first contactor (12) is made after the first contactor is opened. |
