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XNode Diagram

XNode is a pseudo middle point of a tie line. It is a convention for modeling regional boundary in Europe. XNode Diagrams are special Equipment Diagrams used to displays network components connecting two different utilities or transmission system operators. Boundary connections may be represented using different concepts. For example tie-lines are ACLineSegments connecting two Substations belonging to different GeographicalRegions. In Pan-European grids, Boundary Sets are defined as a collection of pseudo nodes in the middle of tie-lines, referred to as XNodes. In CIM, boundary sets are not explicitly modeled. But these network components are of special interest, since these are where MW interchanges are measured and where different network portions are stitched. The Tool identifies these special boundary network components and creates visualizations on-the-fly to present them graphically. The following describes steps used to visualize the boundary network components

  1. Tie-lines and XNodes are identified through a data mining analysis. (See Visual Data Mining for more detail.) These special network components are reported to users as ‘Alerts’ in the validation reports. Users can find such information by running the validation and then selecting the “Alert” from the message type filter. XNode Diagram – figure 1
  2. Users click the hyperlinks. All of the reported boundary network components will be displayed in a Tabular Display. XNode Diagram – figure 2
  3. Users select one boundary network component and click the row to navigate to corresponding Object Form. XNode Diagram – figure 3
  4. Click the hyperlink to visualize the selected boundary network component. If the selected network is an XNode, a special graphical symbol is used to represent XNode. If the selected boundary network component is a tie-line, the generated diagram is simply a regular Equipment Diagram with an ACLineSegment connecting two Substations belonging two different GeogrphicalRegions. XNode Diagram – figure 4

Note: users must realize that boundary network components are not explicitly modeled in CIM. An XNode, for example, is simply a TopologicalNode in the middle of a tie-line and not hosted by a Substation/VoltageLevel, and a tie-line is just an ACLineSegment connecting two Substations belonging two different GeogrphicalRegions. Users will not find objects like TieLines or XNodes in the instance documents.

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