纵联电流差动保护数据同步技术及通道切换时数据交换的研究  

Research on data synchronization technology and data exchanging while channel switching of current differential protection

作　　者：李钢[1] 冯辰虎[2] 孙集伟[3] 王宁[3] 刘平[2] 

机构地区：[1]华北电网有限公司安监部,北京100053 [2]华北电力科学研究院有限责任公司,北京100045 [3]华北电力调度通信中心,北京100053

出　　处：《电力系统保护与控制》2010年第22期141-145,150,共6页Power System Protection and Control

摘　　要：介绍了纵联电流差动保护利用数字通道进行采样时刻同步、采样序号同步及通道延时计算的原理,比较了采用不同同步方法时保护性能的区别,深入研究了双纵联通道不同切换方式下切换过程带来的通道延时变化对差动保护的影响。通过研究,明确了在通道切换过程中及切换完成后的一段时间内,纵联电流差动保护的同步是不正确的,保护必须有相应的对策,否则可能会不正确动作。This paper introduces the basic principle ofthe synchronization ofsample time, the synchronization ofsample number and the channel time delay computation used in pilot current differential protection using the digital channel, compares the difference of protection performance of adopting different synchronization methods, and deeply researches the influence of channel time delay change on differential protection brought by the switch process of double longitudinal channel in different switching modes. Through the study, this paper makes it clear that the synchronization of pilot current differential protection is incorrect in a period after the channel switching or in the switching process, and the countermeasure of protections must be considered, otherwise, false tripping would occur.

关 键 词：纵联电流差动保护 数字通道 通道切换 采样同步 

分 类 号：TM77[电气工程—电力系统及自动化]