Research of relationship between SFCL and distance relay of power system and the improvement of the algorithm of distance protection

With deep research of SFCL,the matching problem between SFCL and relay protection in power system is to be solved.This paper theoretically analyzes the influence that bridge-type SFCL brings to the distance relay.And considering the characteristics of microcomputer-based protection,a new algorithm is proposed to eliminate the influence.EMTDC/PSCAD simulation shows that the algorithm is valid.It is a new idea to solve the matching problem between SFCL and distance relay protection.