Hence, if setting flux and current density limits of singlephase
transformer equals to three-phase one as the design
constraints, the area product ratio, which stands for the
volume ratio, will be around 9/8 for single and three-phase
transformer, which shows a benefit in volume for threephase
transformer.
According to (9) to (12), both B and J are functions of
the five design variables defined in Section III. A. Thus one
optimization model can be summarized as in TABLE IV.
And considering the constraints, it is named as J – B Method
for Transformer Design Optimization.