This information is part of the Modelica Standard Library maintained by the Modelica Association.

Asymmetrical (single-phase) load

You may choose different connections.

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 it may be necessary to ground the transformer's starpoint even though the source's or load's starpoint are grounded:

• Yy with primary starpoint connected to source's starpoint: primary current in only one phase
• Yy primary starpoint not connected to source's starpoint: secondary voltage breaks down
• Yz ... Grounding of transformer's primary starpoint with reasonable high earthing resistance is necessary.
• Dy ... Load current in two primary phases.
• Dz ... Load current in three primary phases.