WOLFRAM SYSTEM MODELER
Library for technical 3phase transformers
This information is part of the Modelica Standard Library maintained by the Modelica Association.This package contains components to model technical three-phase transformers:
Transformers are modeled by an ideal transformer, adding primary and secondary winding resistances and stray inductances.
All transformers extend from the base model PartialTransformer, adding the primary and secondary connection.
VectorGroup defines the phase shift between primary and secondary voltages, expressed by a number phase shift/30 degree (i.e., the hour on a clock face). Therefore each transformer is identified by two characters and a two-digit number, e.g., Yd11 ... primary connection Y (star), secondary connection d (delta), vector group 11 (phase shift 330 degree)
With the "supermodel" Transformer the user may choose primary and secondary connection as well as the vector group.
It calculates winding ratio as well as primary and secondary winding resistances and stray inductances, distributing them equally to primary and secondary winding, from the following parameters:
Please pay attention to proper grounding of the primary and secondary part of the whole circuit.
The primary and secondary starpoint are available as connectors, if the connection is not delta (D or d).
In some cases (Yy or Yz) it may be necessary to ground one of the transformer's starpoints even though the source's and/or load's starpoint are grounded; you may use a reasonable high earthing resistance.