| 摘要 |
PURPOSE:To prevent misjudgment of faults of a non-volatile RAM by sum-check when a power OFF occurs during setting operation. CONSTITUTION:In a digital protection relay for which the sum-check of a set point is possible, an input set point is written in a RAM for buffer, sum value is prepared (A4) at the time when all the set points are written (A1 to A3), all set points read out of the RAM and the sum value are transferred to non- volatile RAM (A5), and the sum-check is performed based on these set points transferred and the sum value (A9, A10). |
