| 摘要 |
PURPOSE:To automatically inspect a circuit breaker tripping circuit of a protective relay device having high reliability by monitoring a contact state of an auxiliary relay duplicate contact by an operation of an additional monitoring auxiliary relay circuit. CONSTITUTION:Auxiliary relays 1, tx are energized to be operated under conditions that, when a contact 6, M of a main element is turned ON, a contact Fs of a fail safe element is turned ON at the time of an automatic inspection, and trip duplicate contact 2, T'x, T''x are turned ON, but since an automatic inspection time locking b-contacts 4, 11 Tb are turned OFF, a circuit breaker B is not tripped. Simultaneously, since automatic inspection time locking a- contacts 4, 11Ta are turned ON, a current decided via a current limiting resistor 9, R flows to the contact 2, T'x, T''x, and a monitoring auxiliary relay 10, Mx is energized to be operated. Then, a contact 3, M'x is turned ON to operate contact operation monitoring means 7, thereby monitoring a state of the duplicate contact 2, t'x, T''x of the auxiliary relay 1, Tx. |
