.PowerSystems.Utilities.Precalculation.baseTrafoRL

Information

Calculates transformer base-resistance and -inductance depending on the choice of units (first index: primary, secondary, second index: R, L).
The secondary side is winding-reduced to the primary, as the equations are written in reduced form.

"pu":

  RL_base = [V_nom[1]^2/S_nom          ] * [1, 1/omega_nom]
           [(V_nom[2]^2/S_nom)/W_nom^2]

  RL_base[k] = [1        ] * [1, 1/omega_nom]
              [1/W_nom^2]

The winding ratio W_nom is given by the nominal voltages:

  W_nom = V_nom[2]/V_nom[1]

Interface

function baseTrafoRL
  extends Modelica.Icons.Function;
  input Boolean puUnits "= true if pu else SI units";
  input SI.Voltage[:] V_nom "nom voltage {prim, sec} or {prim, sec1, sec2}";
  input SI.ApparentPower S_nom "apparent power";
  input SI.AngularFrequency omega_nom "angular frequency";
  output Real[size(V_nom, 1), 2] RL_base "base [prim res, prim ind; sec res, sec ind] or
     [prim res, prim ind; sec1 res, sec1 ind; sec2 res, sec2 ind]";
end baseTrafoRL;