| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground fault detecting device capable of cost reduction by facilitating design and manufacture. SOLUTION: Ground fault overcurrent relays 10A, 10B, 11A, 11B which can detect ground fault overcurrent on the output side and the neutral point side are installed in generators 1A, 1B. For example in the generator 1A, a sequence circuit 20 detects ground fault and obtains the trip output of a breaker 2A when a switch 3A is turned on, a switch 10A is operated and a switch 10B is not operated. When a switch 3B of a generator 1B is turned on, the relay 10A is not operated, and the relay 10B is operated, the sequence circuit 20 detects ground fault and obtains the trip output of the breaker 2A.
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