Study on the storage and maintenance methods of CIM-based data model for distribution network GIS

The distribution network GIS data model is constructed by the relevant classes and relationships which are extracted from the CIM packages.The packages include Core,Topology,Wires,Meas,etc.Meanwhile,the spatial data exchange model of distribution network is discussed.Relational database technologies are applied to implement the spatial database of distribution network GIS,and generalization,aggregation and association relationships are converted to the reference relations between tables.The proposed storage method of data model can prevent the relationships of total model from falling on the leaf nodes,and then reduce the relation's complexity among objects.Using object-oriented technology,the classes of GIS data model are extended by adding maintenance operations and the necessary attributes.The maintenance operations are utilized to generate commands which can maintain the data and relationships of spatial database.The Mount and Unmount operations are added to conducting equipment class,which can establish topological maintenance commands to maintain electrical relationships of conducting equipment.Case study shows that the approaches of class extending adopted by this paper make objects have responsibilities to sustain distribution network topology,and then reduce the maintenance difficulties of spatial database.