PRIMA (VPI) ventilated dry type transformers are ideal for most industrial and commercial applications. These transformers provide excellent mechanical and short-circuit strength, no danger of fire or explosion, no liquids to leak, less weight than comparable cast coil units, low total ownership costs and low initial costs. They use an IS11171 listed 80˚C/115˚C/220˚C insulation system, regardless of temperature rating. Low installation, maintenance and operation costs make PRIMA VPI transformers a worhty investment. VPI transformers are non-explosive with high resistance to flame and do not require vaults, containment dikes, or expensive fire suppression systems.

(VPI) dry-type transformers – Vacuum-pressure impregnated (VPI) transformers are particularly suited for a wide range of commercial applications. Vacuum pressure impregnation of the windings includes a preheat, dry vacuum cycle; vacuum immersion; vacuum hold cycle; pressure cycle; and curing. This VPI process saturates the dielectric material, which contributes to its long life and durability. The secondary windings are constructed with sheet or wire conductors and Nomex insulation. The primary windings are wound over the secondary winding in either barrel or disc construction. These processes make the Power-Dry transformer ideal for office buildings, hotels, and shopping malls.