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This paper describes a way to compare the relative power capacities of medium power transformers as related to their temperature rise and the technology of the basic insulation systems used in the design. Examples are provided to demonstrate the use of hybrid technology in the development of high density power transformers. This new approach can be of value in regions, such as Asia Pacific, where the load growth is high, and the optimum use of equipment is desired. This relates to the reduction of space allowed for transformers and the environmental impact of the transformers in high population centers.