Models for three-phase transformers
This package contains a model for three-phase transformers and a set of functions used to calculate three-phase impedance matrices depending on the transformer connection.
Extends from Modelica.Icons.Package (Icon for standard packages).
|Transformer_3Ph||Three Phase transformer modeled as a PI-equivalent device|
|TransfConnection||Set of functions used to calculate three-phase impedance matrices for transformers|
Three Phase transformer modeled as a PI-equivalent device
This model was design to represent three-phase two-winding transformer.
The user should input the copper resistance R and leakage reactance X in per unit values. The user should also input the tap value, which is the relation between primary and secondary voltage levels, but in per unit. Finally, the user should select the transformer three-phase connection.
Based on this set of parameters, the pi-equivalent impedance matrices are calculated and the transformer equation is assembled. The transformer does not take into account excitation branch, since it is often neglected in transient-stability studies.
Primary side is represented by pins Ain, Bin, and Cin. Secondary side is represented by pins Aout, Bout, and Cout
Extends from ThreePhaseComponent (Partial model for inheritance of single-phase base power based on three-phase system base power.).
|Connection||0 Yg-Yg; 1 D-D; 2 Y-Y; 3 D-Yg; 4 Yg-D; 5 D-Y; 6 Y-D; 7 Y-Yg; 8 Yg-Y;|
|Power flow data|
|S_b||System base [VA]|
|S_p||Phase base [VA]|
|tap||Nominal tap ratio (Vs/Vp)|
|X||Leakage reactance |
|R||Windings copper resistance |