Minimization of Active Part Cost of a 100 kVA Distribution Transformer Using Exhaustive Search Method

This paper addresses the optimum transformer design problem to minimize the active part cost of three phase core type distribution transformer. The transformer design process involves substantial heuristic exercise to select the design, best suited to a set of specifications. The design problem considers minimization of total cost of core and conducting material, while constraints are imposed on no load losses, total losses and percentage impedance as they are very critical to all day efficiency, overall efficiency and voltage regulation of a transformer. A MATLAB program has been developed which calculates all dimensions and performance parameters of 4080 transformer designs, out of which, the design having the minimum cost, satisfying the manufacturing specifications, BEE standards and constraints is selected. The transformer dimensions and performance parameters are compared with the transformers made by Jyoti Transelect Company, Bhuj, (India) and necessary changes are suggested in transformer dimensions to obtain optimal design