| 摘要 |
PURPOSE:To prevent unnecessary operation of a reverse power relay by predicting the operation of the reverse power relay upon disconnection of a load based on the received power, factory load power to be disconnected and a value set in a power setter, and locking a factory load breaker when function of the reverse power relay is predicted. CONSTITUTION:When a factory load No.1 is disconnected, difference between outputs from a factory load power converter 23 and a received power converter 21 is obtained through a power difference operating unit 26, then thus obtained value is fed to a power comparator 28 and compared with a value set in a power setter 27. When the difference between the power of No.1 factory load and the power received from a power receiving system 1 is larger than that set in the power setter, a signal for locking a factory load breaker 9 is provided. Consequently, transfer to independent operation through a non-utility generating system due to operation of the reverse power relay 4 can be prevented. |
