Abstract: Abstract:The composition of secondary virtual circuit of smart substation was introduced. Referring to the description method of primary topology of the substation, the virtual secondary circuit objects of the secondary equipments and their circuit connection relations were expounded. A set of description methods of secondary virtual circuit object information model for smart substation was established, which provides model foundation for the visual state monitoring and the realization of various advanced application functions of the secondary virtual circuit of the smart substation.

Key words: Keywords:smart substation, secondary virtual circuit, virtual conductor, virtual terminal, directed graph, adjacent matrix, secondary loop group, information model