See Also
- Select Open Oneline from the File menu.
- Choose the file type you would like to open by using the drop-down in the bottom right-hand corner of the Open dialog. The Available File Type Options for Opening a Oneline section details how the different file types work.
- Alternately, you can use the file menu choices to open a oneline using a particular linking. The file menu choices are available on the submenu when selecting Open Oneline from the Application Button. The linking choices listed in the Available File Type Options for Opening a Oneline section found below are available with this option (except for the PTI Draw File format). When you select a particular linking option, you will be prompted if you want to save this as your default type. You can override the default by selecting a different linking option the next time that you open a oneline.
- In the list of available oneline files, click on the desired oneline.
- Click OK.
Available File Type Options for Opening A Oneline
- Oneline Display File (*.pwd) - This is the standard binary file used to store oneline diagrams. When this option is selected, oneline display objects involving buses will be linked to their corresponding case data objects through bus numbers.
- Oneline Display File (Name_kV linking) (*.pwd) - This is the standard binary file used to store oneline diagrams, but a special table stored with the file is used to link the oneline display objects involving buses to their corresponding case data objects using bus name and nominal kV combinations instead of bus numbers and renumber the bus numbers of the display objects to match the current case. This option is useful when opening a oneline that was created with a different case than the one currently in memory and the current case has undergone some bus renumbering, but the bus names and nominal kV levels remain the same as in the original case.
- Oneline Display File (Label linking) (*.pwd) - This is the standard binary file to store oneline diagrams, but a special table stored with the file is used to link the oneline display objects by label to their corresponding case data objects. Only objects that allow the use of labels will be linked in this manner. If a linking via label cannot be found, the oneline object will be unlinked. This option is useful when opening a oneline that was created with a different case than the one currently in memory and the current case has undergone bus renumbering, but the labels remain the same as in the original case.
- PTI Draw File (*.drw) - File format supported by PSS/E. All functionality of that file format may not be fully supported in Simulator.
- Display Auxiliary File (*.axd) - This is a text file used to store the oneline display objects.
- Areva Dispaly File (*.ddl)- Simulator can load display files created from an Areva EMS system. Please contact PowerWorld for more information.
You may open as many onelines as you like, and even multiple copies of the same oneline.
The following topics may be helpful when opening onelines created with a different case:
Three-Winding Transformer Star Bus Automatic Renumbering
When opening a oneline diagram by using one of the PWD options, the star buses of three-winding transformers will automatically be renumbered to match the current power flow case. This is done without any input from the user. This is done because some power flow case file formats do not require that star bus numbers remain constant, therefore, if opening a oneline diagram with a power flow case other than the one with which is was created, there is a good possibility that the star bus numbers will be different. The renumbering is accomplished using a table saved with the PWD file that contains the three-winding transformers. If using the name_kV linking to open a oneline, the three-winding transformers in the internal table are identified by name_kV when doing the star bus updates. If the transformer cannot be found when using either the number or name_kV linking, its star bus will not be renumbered.