The current operation manner of the power system is complicated and changes frequently

causing great difficulty in the analysis of operation of relay protection. By making use of computer software to imitate the movement of relay protection in a situation of actual trouble

the operating characteristics of relay protection can be analyzed

such as the check-up of definite values

examination of the protection set

protection movement playback

etc. By gathering the trouble record wave data to emulate actual power system relay protection movement logic and regarding the relay component as the object of movement simulation

the movement characteristics of relay component as the criteria

a relay protection model has been developed which is oriented to different relay types and so accurate that the internal component movement characteristics can be protected

thus realizing the digital simulation of the entire process of relay protection movement of the graphic interface in its true sense by topology analysis.