| 摘要 |
To provide a device capable of preventing reverse charging caused by distributed power supplies always surely irrespective of the kinds of the power generators used for the distributed power supplies. An apparatus (24) for preventing reverse charging, which is provided with a first circuit breaker (25) for performing the connection and separation between an electric power system A and a distributed power supply (11), and which, when the distributed power supply (11) is disconnected from the electric power system A by opening a second circuit breaker F provided in the electric power system A, prevents the reverse charging from the distributed power supply (11) to the electric power system A by opening the first circuit breaker (25), comprising fluctuating means (20) for fluctuating the electric power outputted from the distributed power supply (11) regularly at predetermined periods, a fluctuation period extracting means (26, 27) for extracting the same fluctuating periods as the predetermined periods existing in the periods of the AC voltage outputted from the distributed power supply (11), and a judging means (28) for opening the first circuit breaker (25) when the fluctuation period extracting means extract the fluctuating periods regularly. |
