| 摘要 |
<p>PURPOSE:To prohibit the switching of a relay contact in a state where a high voltage is impressed, by switching the feeder path which performs feeding to a repeater, etc., to double end feeding or single end feeding, and connecting a relay so as not to change a feeding connection state when a fault occurs. CONSTITUTION:The double end feeding is performed between a first feeder 1 and a second feeder 2, and the single end feeding is performed by a third feeder 3. In such a state, when a current ceases to flow on the relay K1 due to the fault of the feeder line 6 or the feeder line 7, the relay contact k1 is restored, but since the current of single end feeding flows on the relay K4, an operating state can be held by a self-holding contact k4-1. Therefore, a contact k4-2 is set an opened state, and it follows that no high voltage is impressed on the contact k1 of the relay K1, and no arc discharge is generated.</p> |
