An automatic graphical display of correlated functions of secondary systems in smart substations

With the increasing coupling of secondary system components in smart substation, the operation management becomes more and more difficult. This paper proposes a graphical display approach of secondary functional components based on “information-event-function” logics. The displayed layout as well as connection relationship, which is accomplished through automatic graphing, clearly describes the logical order and assists auxiliary analysis. Based on the reasoning of the logics of layout and routing, the automatic graphing accurately describes the functional correlation of the secondary components in a simple and intuitive way. The displayed graph can be further improved by comparing it with the actual functional circuit. Several practical examples are presented to demonstrate the feasibility of the proposed approach.