馈线自动化系统采用有线中继通信方式时,为了远距离传输信息,中继点的线路收发器要对信息进行中继放大,并且当某个中继点发生故障或维修时仍能保证线路的正常通信,还要解调分站对智能终端FTU的“巡测”或“故障查询”信号,调制“节点终端的自报”等信息。文中研究了具有上述功能的线路收发器的电路组成和工作原理。 Feeder automation system using wired relay communication, in order to transmit information over long distances, repeater point line transceiver repeater to amplify the information, and when a relay point of failure or repair can still guarantee the normal line Communication, but also to demodulate substation FTU FTU “patrol” or “fault inquiry” signal, modulation “node terminal self” and other information. In this paper, the circuit components and working principle of the line transceiver with the above functions are studied.