Construction of high-voltage inductive transformers

The COFI transformers are manufactured with top-quality choice materials in accordance with CEI EN 61558/2/3 product regulations and the instructions of VDE 0550 and SEV BA9. The copper wire used for the secondary circuit winding is H 180°C Class, while the wire for the primary circuit winding is H 200°C Class. The insulation between layers in the high-voltage coils is ensured by a polyester film with high dielectric constant. The transformer is then encapsulated with Araldite, a thermosetting epoxy resin resistant to a temperature of over 160°C, that offers it high mechanical resistance together with excellent dielectric properties, resistance to fuel oils and to chemical agents, very good thermal dissipation and - last but not least - elimination of harmful volatile materials from the production cycle. Moreover, the materials enable a surface finish that is comparable with metal. All the other components have been chosen from the best available on the market, taking into account the best resistance to temperature in order to ensure indestructibility even in the most severe duty conditions.