基于光纤的位同步通讯纵差保护原理

Theory of differential pilot protection based on optical fibre and bit-oriented communication

结合光通信技术,研究出一套微机保护系统.该系统使用HDLC位同步通信协议,提高了数据传输的可靠性和效率.将一种新的具有优良制动特性的电流差动保护判据,应用到微机分相差动保护装置上,获得了良好的动作特性,使保护的性能得到很大提高.同时,采用采样数据修正法校正了保护两端的正点采样时刻,解决了电流数据不同步的难题.并利用数字锁相环实现了保护双端通信的同步.

A set of the theory of mlcroprocessor-based protection is researched, combined with the technology of fibre-optic communication. The reliability and efficiency of data transmission is improved by using the HDLC protocol. A new differenti- al protection principle with choiceness character of the brake is applicatted to the microprocessor-based distinguished phase protect device, then a good character of movement has been gotten, and the capability of protection gets great raising. Mean- while, two-end punctual sampling times are corrected by means of sampling data correction, and the baffling problem of non- synchronization of electrical current data has been solved. At the same time, two-end synchronization of communication is realized by digital phase lock loop.