The Choice of Main Power Transformers for Generating Stations

In the past few years some lack of confidence has existed when the engineer is confronted with the task of specifying the main power transformer at generating stations. The proper choice of rating-cooling method, kilovolt-ampere size, voltage, insulation, and so forth-requires an approach which can be rationalized as good engineering. This necessitates not only an economic choice but one based on adequacy of electrical and mechanical requirements. It is the purpose of this paper to present an approach whereby the factors that affect the selection of main power transformers at generating stations may be evaluated.