电流差动保护中光纤通讯系统的设计

Design of fiber-optical communication system in current differential protection

介绍了在电流差动保护中线路两侧保护装置的通讯原理,并针对以往通讯过程中误码率高、易中断等问题,采用G.703标准,给出了硬件设计方案和软件流程。系统由通讯控制芯片PEB20532、CPLD芯片XC95288以及光收发器模块RTXM154TL组成,实现了模块化设计。阐述了各个子模块间通讯接口的实现方法,从本地装置的数据发送、编码解码并发送到对侧装置的时钟同步等问题一一给出了解决方案并进行了仿真验证。该方案已在保护装置中实现,提高了装置的通讯质量。

This paper introduces the communication principle of the protective devices installed on both sides of the power-line in Current Differential Protection and aiming at the problem of previous communication process for the high error rate,interrupts and so on,using G.703 standard,gives the hardware design and software process.This system is based on high-performance serial communication controller chip PEB20532,CPLD chip XC95288 and the optical transceiver module RTXM154TL and implements a modular design.It describes the implementation of the communication interface between the various sub-modules and gives the solution for the local protective device of data transmission,encoding and decoding and the problem about clock synchronization sent to the opposite side of protective device.This project has been widely used in protective device and has improved the quality of communication in protective devices.