The high voltage coil of this dry type transformer is fabricated with metal conductors such as copper and aluminum. These conductors are also covered with class F insulation that could withstand up to 155 degree C.
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The resin casting process is done under vacuum conditions. This method results in an excellent void-free coil.
This dry type transformer is usually installed in a location that is needed to be safe from fire (ex. inside the building, hospital). When there’re short circuit or bomb explosion, this transformer will not be ignited.