Drying and rehabilitating distribution transformers

A LARGE INDUSTRIAL PLANT on the eastern seaboard has developed a method of drying and rehabilitating transformers used in its electric power distribution system in its own shops. The procedure does not require a drying oven and produces results which equal or excel oven-drying in time requirements and improvement of insulation-resistance values. Development of this process was made necessary by the fact that the plant was faced with the prospect of failure of several 5,000-kva 11.5- and 2.5-kv transformers, which would have seriously crippled operations, and which readily could have resulted in complete shutdown of the plant for an extended period.