Take any book of transformer design and you will see an abstract design, no book offers a complete solution for the aspiring designers so that they can gain insight into the practical formulas of transformer design. So this was the incentive that gave us the passion to dig deep into the design of power transformers. That was our main aim. How an actual power transformer is designed. What are the constraints and limitations? What is the cost? How do we make an actual power transformer? What is the core? What is the winding? How do we select the winding? How do we select the core diameter? How we select the type of winding? How do we calculate the losses? All these questions were in our mind when we started this project.This thesis will help any design engineer aspiring to take an insight to the design world.