A new type of instrument transformer insulation, called butyl, can be molded right over transformer core and coils. Tests have shown butyl to be superior electrically, mechanically, and chemically to asphalt-impregnated paper insulation, operating at or below 15,000 volts.Compound Filled. Compound-filled transformers are insulat ed in much the same manner as dry types, except that a metal and porcelain casing is placed around the cor e and coils, and the tr eatment with insulating compound is done in this casing. As a result, the casing is entirely filled with compound.
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