Introducing US DuPont Reliatran Technology and Nomex paper based Class-H & C insulation system approved by UL, open ventilated dry-type transformer is obviously safe, reliable, environment-friendly, (fire + blast + dust + moisture + mildew) proof and of excellent surge capacity, small dimension as well as easy maintenance. Besides, overwhelming advantages of especial design, sound structure, brilliant appearance and outstanding performance make it most suitable for such locations with severe fire restriction or frequent voltage fluctuation as high-rise, airport, bus station, wharf, subway,hospital, power plant, smelting plant, plaza, densely populated areas, petrochemical Industry, nuke and so on.

Why it is much better than Cast Resin Dry-type Transformer ?

Enhanced Safety There are no liquids to spill, explode or burn, and NOMEX does not support combustion in air. In the case of a building fire, NOMEX products do not produce significant amounts of toxic smoke or dangerous particles. (For this reason, among others, NOMEX is used extensively in honeycomb structures for aircraft interiors).

Low Transmission Losses Since dry type transformers insulated with NOMEX can be located close to their loads - inside factories, schools, hospitals and apartments - low-voltage lines can be shortened.

Reduced Cost, Size and Weight 150 C-rise units insulated with NOMEX require less conductor and core steel, resulting in lower initial cost. This reduced size and weight contributes to ease of installation, especially since no vaults or catch basins are required. Smaller cores also mean lower no-load losses.

Increased Reserve Capacity If transformers are to be operated continuously at or near their rated loads, efficiency is of prime importance. In this case, one could select 80 C-rise units insulated with NOMEX, allowing these units to operate continuously at 133 percent of rated load (if needed, for example, due to unplanned expansions) at a much lower cost (in increased load loss) than that associated with adding an additional transformer.

Improved Reliability Surveys published by IEEE show failure rates of modern open ventilated dry type transformers equivalent to conventional liquid-filled units in the same power and voltage classes. Repair time for dry type units is also considerably shorter.

Resistance to Humidity Since the properties of densified NOMEX papers and pressboards are insensitive to moisture, open ventilated transformers insulated with NOMEXR perform satisfactorily in the most humid environments. This allows the placement of OVDT units in many locations not considered in the past.

Friendly to the Environment At the end of their useful life, VDT units can easily be dismantled, and the copper (or aluminum) conductors recovered, along with the steel core.