| 摘要 |
PROBLEM TO BE SOLVED: To provide a protective relay including a notification part that can hold operation display for a long period of time even after a control power source fails and notifies operation history.SOLUTION: A protective relay 100 comprises: a node (a power source line PL, hereinafter also referred to as a node PL) receiving a signal varying with the situation of a power system 106 to be protected; a capacitor 19; and a diode 18 connected between the node PL and the capacitor 19 using the direction from the node PL toward the capacitor 19 as a forward direction; a notification part (a light emitting diode 22) notifying operation history using power stored in the capacitor 19; and a connection switch 20 that is conducted when the signal shows a failure in the power system and actuates the notification part by supplying the power of the capacitor 19 to the notification part. |
