I was wondering if anybody would know where to find a research paper which has a measured saturation curve for a 10 -50MVA Silicon Steel Core Transformer.
I might be able to dig up a test report with excitation current measured at several voltages up to 1.15 per unit. How much detail do you need for the curve? How far into saturation do you need it to go?
You can get such curves from electrical steel manufacturers. They publish graph for each type and grade of steel. Best is Nippon Steel. Please refer the catalogue at their website.