| 摘要 |
PROBLEM TO BE SOLVED: To correctly diagnose a sign of abnormality of operating characteristics of a switch. SOLUTION: When a contact 50a is closed and a closing coil 10 is energized with responding to a closing command, a main contact of a breaker 1 is closed and an auxiliary b contact 30a is opened. Time from closure of the contact 50a to opening of the auxiliary b contact 30a is detected as a first action time T1 and time from opening of the auxiliary b contact 30a to closure of an auxiliary a contact 40a is detected by a measuring part 6 as a second action time T2 when closing action of the main contact of the breaker 1 is completed and the auxiliary a contact 40a is closed. The detection times T1, T2 are corrected by a diagnosis part 7 based on detection temperatures of each temperature sensor 5. Existence of abnormality of action times of the breaker 1 is judged by a judging part 8 with comparing corrected action times T1, T2 and fixed values as reference values of each action time. COPYRIGHT: (C)2004,JPO
|
