1. From the Calculate menu, choose General procedure settings.
The General procedure settings window opens.
2. In the navigator, select PrT settings > Node impedances.
3. In the Standard method selection list, select option Turns VDF.
4. In the navigator, select PrT settings > Node impedances > Turns VDF.
5. In the Volume-delay functions section, insert the desired VDFs (Selecting a VDF and setting the parameters).
6. In the Turn types section, allocate the numbers of the desired VD functions to the turn types in the VDFNo (VD functions number) column.
7. Confirm with OK.
The changes are applied.
