线路纵联保护中双向复用段倒换环动态时延特性

介绍了双向复用段倒换环的工作原理。以苏州电力光纤通信网西外环为对象，研究了各种通道故障下复用段保护切换、恢复过程中通道时延的变化情况。研究结果表明：苏州电力光纤通信网西外环采用双向复用段倒换模式，即使在保护切换、恢复过程中也能保证通道双向时延一致，适用于包括采用数据通道同步方法线路纵差保护在内的任何线路纵联保护。

Research on Dynamic Transmission Delay of Bidirectional Multiplex Section Switching Ring Used for Line Pilot Relay

This paper describes the principle of the bidirectional multiplex section switching optic communication grid as the object of research, this paper studies the transmission de ring. Taking the Suzhou power fiber lay during protection and recovery in various channel failures. The results indicate that the west-outer-ring in Suahou power fiber optic communication grid that adopts the bidirectional multiplex section switching mode can ensure consistency of the bidirectional transmission delay even during protection and resumption, making it suitable for any line pilot relay including the line current differential relay based on the method of data channel synchronization.