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

Test example with polyphase components:
Star-connected voltage source feeds via a Y-Y-transformer with internal impedance (RT, LT) a load resistor RT.
Using f=5 Hz LT=3mH defines nominal voltage drop of approximately 10 %.
Simulate for 1 second (2 periods) and compare voltages and currents of source, transformer and load.

m	Value: 3 Type: Integer Description: Number of phases
V	Value: 1 Type: Voltage (V) Description: Amplitude of Star-Voltage
f	Value: 5 Type: Frequency (Hz) Description: Frequency
Lm	Value: 1 Type: Inductance (H) Description: Transformer main inductance
LT	Value: 0.003 Type: Inductance (H) Description: Transformer stray inductance
RT	Value: 0.05 Type: Resistance (Ω) Description: Transformer resistance
RL	Value: 1 Type: Resistance (Ω) Description: Load Resistance
nT	Value: 1 Type: Real Description: Transformer ratio