Per-Unit Impedance Evaluator.
Evaluates the per-unit impedance value given the per-unit power and voltage
bases.
\[Z_{pu}=\frac{V_{LL}^2}{S}\]
\[Z_{pu}=\frac{(\sqrt{3}*V_{LN})^2}{S}\]
- Parameters:
- S : float
The per-unit power base.
- VLL : float, optional
The Line-to-Line Voltage; default=None
- VLN : float, optional
The Line-to-Neutral Voltage; default=None
- Returns:
Zbase – The per-unit impedance base.
- Return type:
float