Epoxy encapsulated

Epoxy encapsulated is a process in which a transformer is completely sealed with epoxy resin. This process is normally preferred when a unit might encounter harsh environmental conditions.
Designed to withstand the harshest indoor and outdoor applications, usually rated Nema-3R or Nema-4 they provide reliable protection from corrosive atmospheres, hazardous gases, dust and moisture. Given their mechanical ruggedness and electrical and thermal characteristics, encapsulated transformers can be used for a wide range of challenging applications, including industrial equipment or appliances designed for harsh operating conditions, out-door metering equipment, and line-monitoring electronics. Applications are found in pulp and paper plants, steel mills, petrochemical plants, food processing facilities, breweries, mines, marine and shipboard installation.

Epoxy Encapsulated transformers are usually a mixture of silica sand resin forming a solid mass completely encloses and protects the core and coil, also significantly reduces audible noise. The Enclosure is constructed from heavy gauge steel. They offer a number of advantages over traditional open-core designs. The most obvious benefits arise from the physical protection that the encapsulate and outer casing provide to the windings, core, and lead connections. With these fragile components sealed inside a tough, waterproof casing, encapsulated transformers are a clear choice whenever moisture, dust, dirt, or other environmental threats are an issue.

Encapsulation also has a strong impact on thermal and electrical performance. The epoxy compound used for potting has a high coefficient-of-thermal conductivity and is very effective at dissipating heat away from the windings and core. This thermal management reduces winding temperature differentials and allows the transformers to be used in higher ambient temperature environments without exceeding allowable temperatures for the insulation class.
The epoxy encapsulated also increases electrical insulation reliability when compared to tape or paper insulation. All production is subjected to a hi-pot test between primary and secondary windings. With no air around the windings, there is reduced potential for corona under high voltage surge conditions.

The manufacturing process for encapsulated power transformers is closely controlled for quality and consistency. Potting is done under vacuum. All products are thoroughly tested at each stage and are designed to meet a wide range of Canadian, US and international standards. Epoxy Encapsulated transformers are available in Dry type Transformers, Step-up and Step-down transformers, Isolation transformers, and K-Factor Transformers.