| 摘要 |
PURPOSE:To provide a protective relay proper for particularly obtaining the positive protection coordination of high and low order relays and a protective relay system using the protective relay. CONSTITUTION:Relays 1, 2, 3, 4, 5 are connected to data receiving-transmitting connection lines 6, 7, 8, 9, performance characteristic data are transmitted from a low-order relay by a high-order relay, and the protection coordination of a high order and a low order is acquired. Accordingly, the performance characteristics of the high and low order relays can be changed freely, thus obtaining positive protection coordination. |
