Winding Group 
This component groups together windings of one device or device category. Windings define the transformation ratio (of transformers, for example) and are divided into primary and secondary windings. A winding group contains at least one primary and one secondary winding.
You can define a text field for the winding demand in Customizing under Define Winding Demand.
You can deactivate checks for maximum current and voltage in Customizing. To do this, go to
This component is optional. It is only required if you use transformers.