The author provides an overview of the available types of solid cast transformers and compares the advantages and disadvantages of solid cast transformers with those of alternatives. Specifically, a comparison between different solid cast construction techniques is made in the following areas: available techniques; high voltage coils; low voltage coils; and mechanical, electrical, thermal strength, and flame test results. Also, comparisons are made between solid cast transformers and other dry-type and liquid-filled transformers. It is concluded that solid cast transformers do not present potential environmental problems, have proven to be self-extinguishing in flammability tests, can match the basic insulation levels (BILs) of liquid-filled transformers, have higher short-circuit strength, require very little maintenance, and have a very competitive total installed cost.
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