Transformers Device Feature Class

​Transformer devices in general are represented in the ArcFM UN as features in the devices feature class that have two terminals. One terminal functions as the primary side of the transformer and the other as the secondary side. A three-winding transformer can also be represented in the ArcFM UN as a device that has a third terminal to function as the tertiary side. Each terminal is understood to represent a connection to a circuit with a different VoltageGroup value. 

For example: A Y:Y connected MV/LV transformer will have its primary terminal connected to MV conductors (e.g. VoltageGroup = “12.47kV/7.2kV”) while its secondary terminal will be connected to LV conductors (e.g. VoltageGroup = “120V/240V”).