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Powell's method gives a computationally efficient algorithm for searching and finding out the optimal solution. It is a direct search method which can be applied to single variable or multiple variable problems. If the no of variables is more than one, Powell's conjugate direction method is made use of. In this paper, the method has been applied to find out the optimal design of a 3-phase 3-limbed dry type transformer. The cost of production has been taken as the objective function. The keyfatcat:b7jnr7o4pfftrethisv5a3ai2q