2 Load an IEEE Common Data Format File

Step 1 Initialise Work Space and Example

2    Load an IEEE Common Data Format File

We will now load a sample network in a simple, text format. The IEEE Common Data Format is used for simple bus-branch models and within Cimphony’s Network Examples we have examples of the common IEEE test models.

2.1 Load the Network5

  1. Expand the Examples project and its IEEE CDF folder Data
  2. Right click on the ieee14.cdf file and select Open With then Cimphony IEEE CDF Browser (double-clicking will have the same effect)
  3. This will open the Cimphony IEEE CDF Browser window showing the data elements: Branch, Bus, Interchange, LossZone and Study.
  4. The left pane shows the types of data element (defined as classes within Cimphony) and the right shows the instances of each
  5. We can expand the root Study element to see the elements it contains


2.2 Check Network Base Voltages7

  1. Right click on the Bus class in the Types column
  2. Click View in Table to view the data for each instance in a table formunder a new editor in a separate tab
  3. Scroll along the table until the baseV column is found. If this column isempty or partially filled then voltages need to be added to the data as the default data has no base voltages

2.2.1 Populate Voltages8

  1. Close the Table Viewer by clicking the small white cross in the tab, this will return you to the Cimphony IEEE CDF Browser
  2. With the Bus class selected under Types select an individual bus under Instances. For the IEEE 14 the HV and LV indicate High and Low Voltage. We will set the HV to 110 and the LV to 33 so select Bus 1 HV
  3. Within the Properties section of the Cimphony Browser enter a value of 110 beside the Base V property and hit Enter to update this value
  4. An asterisk will appear next to the name of the tab to indicate that this editor now contains unsaved data
  5. Select Bus 10 LV and set its Base V to 33 in the same way

We could repeat this for each bus, bus instead we can use a pre- existing transformation to traverse the network and update the remaining voltages automatically9


  1. From the main menu choose Resource→Transform→Transform Resource… (or click the10 icon in the menu-bar at the top)
  2. Expand the IEEE CDF (1973) Transformations folder
  3. Select Propagate Voltages
  4. Click Next
  5. Select the loaded resource under Workspace→IndependentResources→/Examples/IEEE CDF/ieee14.cdf
  6. Click Finish
  7. This will traverse the network, propagate the voltages then once the transformation has finished there are options to view details of the transformation log by expanding the Details.
  8. Click OK to dismiss the popup and return to the Browser.
  9. Each Bus should now have a Base V set, which can be verified byrepeating the steps in 2.2 to view the Bus instances in a Table View.