AC furnace transformers are made both as single- and three-phase. In many installations around the world, furnace transformers have been designed as shell type. All other transformers for this purpose are made as core type. Manufacturing of new AC furnace transformers are made as core type with a few exceptions.DC furnace transformers are also used to melt scrap metal (steel). Three-phase is the most common design. Since direct current is used in the melting process the transformer is installed in combination with a rectifier, which feeds the furnace
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