同步数字传输体系(SDH)下的精确对时方案研究  

Research on method of time synchronization based on SDH

作　　者：伦惠勤 骆燕婷 廖晓春 邓其军[3] 陈显烽 

机构地区：[1]广州市供电局,广东广州510600 [2]武汉顺承科技有限公司,湖北武汉430079 [3]武汉大学动力与机械学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2014年第4期485-489,515,共6页Engineering Journal of Wuhan University

摘　　要：时间同步对电力系统稳定运行、监控保护、故障分析处理等具有重要意义,对SDH同步传输体系下的精确对时方案进行了研究.首先介绍了SDH的相关知识,并以此为基础针对对称路径和不对称路径两种情况分别提出了实现精确对时的具体方案.对称路径的对时需要利用外部时钟源,并借助通道延时测量技术实现,而不对称路径的对时则需要借助于B码进行对时.最后给出了两种对时方案的实际测试结果,结果显示对时精度符合要求,为SDH地面同步网在时间统一方面的应用提供了参考.The time synchronization is of great significance for power system stable operation,monitoring,protection and analysis,etc.A time synchronization method based on the synchronous digital hierarchy（SDH）is studied.First some knowledge of SDH is introduced;and as a basis the authors propose the specific schemes to realize accurate time synchronization under both the symmetrical paths and asymmetric path.To realize the time synchronization under the symmetrical path,an external clock source and the channel delay measurement technology should be introduced in,and the inter-range instrumentation group（IRIG-B）is introduced into the scheme to realize the time synchronization under the asymmetric path.Finally,the authors give the actual test results of both the proposed schemes.The results show that the method can meet the requirements of accurate time synchronization,so as to provide a reference for the SDH synchronization network on the ground in time unification.

关 键 词：同步数字层 对称路径 不对称路径 精确对时 B码 

分 类 号：TM762[电气工程—电力系统及自动化]