Abstract: Intelligent substation has the characteristics of digitalization and standardization of information sharing,which has fundamentally changed the technical form of conventional substation,especially in the virtualization of secondary circuit,which brings new challenges to substation operation and maintenance.Considering the current on-site operation and maintenance requirements of intelligent substation,an intelligent operation and maintenance technology scheme and intelligent application of secondary equipment were proposed,including automatic inspection of soft strap status,sequential execution of secondary safety measures and other functions.Combined with the actual substation application,the functions were described.The on-site application shows that the comprehensive scheme of intelligent operation and maintenance of secondary equipment and intelligent application can improve the accuracy and efficiency of on-site operation and maintenance of intelligent substation secondary system,and provide ideas for intelligent operation and maintenance of substation.