电流差动保护复用数字通信系统时的时钟问题

为准确、迅速、不失真地在继电保护装置与通信设备之间传输数据信号，需要对通信系统和继电保护装置的时钟进行合理设计。文中详细分析了继电保护信号周期性误码即滑码现象产生的原因，以及“主-从”和“主-主”两种通信方式对继电保护的影响。通过对国外几种电流差动保护装置的分析，指出主-主时钟方式的通信系统产生的滑码现象在改用主-从方式后得到了有效的消除。理论及实例分析表明，通信系统的主-从时钟方式是电流差动保护装置在复用数字通信系统时正确工作的理想方式。

THE CLOCK PROBLEMS IN THE MULTIPLEXING SYSTEM OF DIGITAL COMMUNICATION AND DIGITAL CURRENT DIFFERENTIAL PROTECTION

To accurately and quickly transmit data signals between the relay protection and com munication system without distortion,it is necessary to make a rational design of the clock of the communication system and relay protection.The cause of the cyclic code error or the data slip phenom enon of the relay protection signals is analyzed in detail,and the effects of the master- slave clock m ode and the m aster- m aster clock mode on the relay protection are discussed.It is pointed out that the data slip phenom enon occurring in the com munication system of the master- master clock mode has been effectively eliminated after adopting the m aster- slave m ode via an analysis of several kinds of the current differential protection in use abroad.It is shown by theory and case study that the master- slave clock mode in a com munication system is ideal for proper functions of the current differential protection.