An option is provided to allow users to enter the saturation characteristic for magnetizing inductance in the form of pairs of I-V points (I, Vpu).
The first point entered on the I-V curve should be (0.0, 0.0) and the second point should be (I2, V2), where I2 is the current (any unit) at which saturation commences, and V2 is the corresponding per-unit voltage. All current values will be internally re-scaled based on the actual current at the voltage V2 specified by the second point.
If less than 10 points are available, the last pair entered must be (-1.0, -1.0). The program in this case replaces the voltage with the saturation and re-scales the current to a per unit value based on the unsaturated value of inductance input in the previous section.