.Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.ACACTransformerStepDownYD

Information

This is a simplified equivalent transformer model with Y-Delta connection (voltage step down). The model accounts for winding Joule losses and leakage reactances that are represented by a series of a resistance R and an inductance L. The resistance and the inductance represent the effects of the secondary and primary side of the transformer.

The model is parameterized using the following parameters

• Vhigh - RMS voltage at primary side,
• Vlow - RMS voltage at secondary side,
• VAbase - apparent nominal power of the transformer,
• XoverR - ratio between reactance and resistance, and
• Zperc - the short circuit impedance.

Given the nominal conditions, the model computes the values of the resistance and inductance.

Configuration:

The image below describes the connection of the windings.

Note:

This model reuses models from Buildings.Electrical.AC.OnePhase.Conversion.ACACTransformer.

See Buildings.Electrical.AC.ThreePhasesUnbalanced.Conversion.BaseClasses.PartialConverterStepDownYD for details on the connections.

Revisions

• October 3, 2014, by Marco Bonvini:
  Revised documentation.
• June 6, 2014, by Marco Bonvini:
  First implementation.