Abstract
The database system named DIPOS intended for use in computer-aided electric power system expansion planning is presented. The CAD system containing the DIPOS database is briefly explained in the context of the transmission network expansion planning. There are many reasons that in CAD applications we should rather think about specialized or problem-oriented databases, which would give unique solutions in particular situations, than general purpose databases with maintenance and operation overheads. In the paper the user's view of data, user interface, database data model and physical database organization are discussed. The system is the relational database from the user's point of view but it employs the network database data model at the system level. This allows the user to have well known natural relational data model with its correctness and ability to perform Profitable relational operations, whereas the DIPOS database network data model gives additional advantages in the pre-definition of possible use patterns of the data. An example of database application is also presented.
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