Abstract
Gas insulated transformer is suited for urban underground substations because of its non-flammable and non-explosive nature and compact installation space and its use has been growing in urban area. However, to meet the demand for large capacity unit of gas-cooled type transformer, cooling difficulty caused by small heat capacity and thermal conductivity of SF6 gas should be solved. A 275kV•300/3MVA gas-cooled gas-insulat ed shell form transformer has been developed by use of a new cooling structure and it is now under a long term energizati on test. This paper describes main features of the transformer as well as cooing and insulation characteristics obtained by component models of trans-former and a full scale model transformer.
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