| 摘要 |
<p>PURPOSE:To secure closure of the remote feeding loop in case the disconnection occurs at the fixed section by detecting the disconnection via the relay. CONSTITUTION:The circuit which detects the disconnection and then closes the remote loop is connected between the going and coming-back repeater stations. When the disconnection occurs between the repeater stations, the relay within the repeater station becomes insensitive. And thus contact 22 switches to contact (a). Then capacitor 27 which is charged until the disconnection occurs is discharged via the closed circuit comprising break contact 21, transfer contact 22, relay 23 and capacitor 27 each. Thus relay 23 is excited to release contact 21. As a result, the release is secured between the cathode and the anode of thyristor 26 with the ignition given to thyristor 26. Thus the remote feed current flows to the circuit reaching connection point P4 through resistance 25, thyristor 26, contact 22 and relay 23 from connection point P3.</p> |
