| 摘要 |
PURPOSE:To permit the inspection of a double-protective relay at a time when making carrier inspection by providing additionally AND gates to each of double- protective relays. CONSTITUTION:When making the carrier inspection of a double-protective relay of a different frequencies-steadily sending type, consisting of two relays I and II, AND gates C are each added to the relays I(10) and II(11) of the electric station A and the relays I(12) and II(13) of the electric station B. accordingly, in the case of the relays 10 and 12, the relay 17 for carrier inspection can be operated by at a time when the inspection command 33 or 35 is given and also at a time when both the I andII carrier receiving terminal station devices 25 and 29 receive no carrier signal from the counter ends, thus permitting the carrier inspection of the double-protective relays at a time. |
