Non-encapsulated coil dry transformer is a special type of dry type power transformer.The iron core of the dry transformer is mostly made of silicon steel sheet and cast epoxy resin coil. The high voltage winding in these two sets of epoxy resin cast coil windings has a higher voltage than the low voltage winding, which has a lower voltage. To improve electrical insulation, an insulating tube is positioned in between the high and low voltage coils. Soft cushions support and fix the high and low voltage coils on the steel castings.