RCS-900系列保护装置与2048kbit/s复用通道时钟的配合

Coordination in Communication Clock for RCS-900 Serial Protection and 2048kbit/s Multiplex Channel

在RCS-900系列保护装置采用2048kbit/s复用通道的推广过程中,发现打开通道的输出再定时功能,并且将保护装置的通信时钟设置为内时钟方式时,保护装置接收信号会产生滑码。针对上述现象,研究了通道输出再定时对业务频率的影响,并测试了通道输出再定时以及两侧保护装置通信发送时钟在各种模式组合下的业务传送效果。研究结果表明:通道输出再定时能把来自数字同步网的定时基准信号和业务数据信号合成在一起送给外接继电保护装置;打开通道输出再定时功能时,需将继电保护装置通信时钟设置为“从—从”方式;关闭通道输出再定时功能时,至少将一侧继电保护的通信时钟设置为内时钟方式。

If the RCS-900 protection adopts the 2 048 kbit/s multiplex channel, slips may occur in the receiving code of the protective equipment while the retiming function of the channel is on and the communication clock of the protective equipment is set in the inner clock mode. The impact of the retiming function on service is studied and the service transmission results in different modes of combination of the retiming function and the transmission clock are tested. The results show that part of the 2 048 kbit/s channels can perform the retiming function, combine the reference timing and service data for transmission to the protection equipment. The protection equipment communication clock should adopt the ＂slave-slave＂ mode when the retiming function is on and at least the communication clock on one side of the protection equipments should adopt the inner clock mode with the retiming function off.