Automatically Inserting Interface Display Objects

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The Automatic Insertion of Interfaces Dialog is used to automatically insert interface objects on the oneline diagram between existing area/zone display objects. Interface pie chart objects can also be inserted as part of this process. The automatic insertion of interface display objects greatly accelerates the construction of interface diagrams, which are particularly useful for animating the results of PTDF calculations. Area-area and zone-zone interface records can be displayed using interface display objects as well as interfaces comprised only of transmission branches.

Inserting interface objects on a oneline diagram does NOT add interface objects to the load flow case. The interface definitions need to be added to the load flow case prior to automatically inserting the graphical interface objects on a oneline diagram. The quickest way to add area to area or zone to zone interface definitions in the load flow case is to automatically insert the definitions in the interface case information display.

Once you have the interface definitions defined in the case, you can automatically insert the interface objects on a diagram using the following procedure:

• On a oneline diagram (either an already open diagram or a brand new one created by choosing New Oneline from the File menu), place area/ zone objects at the desired locations if inserting area-area or zone-zone interface records. Otherwise, the terminal buses for the branch elements in the interface should be inserted at the desired locations on the oneline diagram.
• Go to the Draw ribbon tab and choose Auto Insert > Interfaces on the Quick Insert ribbon group.
• Check the Insert Pie Charts on Interfaces box to automatically insert interface pie chart objects when the interfaces are inserted. If this option is selected, change the Default Size of Interface Pie Charts to specify their size.
• Choose the type of interfaces to insert. Area to Area or Zone to Zone Interfaces and Line/Transformer Interfaces can be inserted. Area-area and zone-zone interfaces will be drawn between the respective area and zone objects displayed on the oneline. Line/transformer interfaces will be drawn based on the average location of the terminal buses of all transmission lines comprising the interface. If inserting line/transformer interfaces, the option Minimum Length of Line/Transformer Interfaces can be set to prevent interfaces that are too short from being inserted.
• Select OK to insert the new oneline objects. New interface objects are automatically inserted based on the selected criteria for any corresponding interface record that is not already represented.

Note that you can do this automatic insertion as often as you like. The Number of Interfaces Not Shown field indicates how many interfaces still need to be added to the diagram to represent all defined area-area, zone-zone, or line/transformer interfaces. It is a read-only field.