Transformers

Dynapower Corporation started to develop our line of transformers over 40 years ago when we first began manufacturing rectifiers. These technologies were all designed and are manufactured at our facility in South Burlington, Vermont. Our transformer products are custom designed to suit your overall system needs, which allows Dynapower to fill a unique niche in the market of having sales, design, manufacturing, and testing capabilities for all of these products in the same location.

All of our transformers are wound using copper conductors and core steel is cut in house. These transformers are designed, manufactured, and tested in accordance with ANSI and IEEE standards, but other standards can also be considered as required by individual customers.

Our open wound dry type transformers are most commonly applied as main components to our rectifier systems. These transformers are encapsulated using a vacuum pressure impregnation process with polyester varnish and can be cooled either by air or water.

Epoxy cast coil transformers are also manufactured at our facility, which casts the windings into a solid mass of epoxy under vacuum using steel molds. This technology offers unparalleled mechanical strength by sealing the coils in an impervious casting of dielectric epoxy resulting in the most reliable and longest lasting transformer technology available. Although this line was originally developed to augment our other dry type transformers in larger rectifier applications, these have also been sold extensively as stand alone products for distribution and specialty applications.

Our liquid immersed product line was developed for larger and higher voltage applications where the benefits of dielectric oil allowed our rectifier systems to grow both in kVA and voltage class. These transformers are designed in specialty tanks for integration with our rectifier systems.

Dry Type, Cast Coil Transformers

Dynapower Corporation is pleased to offer the ULTRACAST line of cast coil transformers, designed for applications that demand high reliability and continuous performance. Developed in the United States, the ULTRACAST process locks the windings in a very strong, high dielectric, epoxy resin, thus protecting the transformer from extremely severe environments and electrical demands. These units meet rigorous operating parameters, efficiently, safely, and reliably. Cast coil transformers feature a long service life, lower insurance expense, and are virtually maintenance-free, all of which reduce the cost of ownership. These transformers are also environmentally safe, which benefits the end user as many types of liquid-filled, medium voltage equipment have been made obsolete by environmental concerns and increasing insurance costs. 

• Custom electrical and mechanical designs available for Industrial and utility distribution and rectifier applications
• 300 kVA to 10 MVA  standard range with other options available
• 600 V to 35 kV class voltages
• 10 to 150 kV basic impulse levels
• 80° and 115° C temperature rise levels standard with other options available
• All coils wound with copper conductors.
• DuPont Nomex® UL recognized 220° C insulation system
• Both primary and secondary windings cast in 200° C UL recognized epoxy
• Convection cooled, forced air and direct water cooling system available
• Mitre cut, cruciform, step lap core fabricated from M6 grade grain oriented silicon steel standard, but other grades also available
• Numerous NEMA and specialty enclosure options available
• Nationally recognized testing labo ratory (NRTL) inspection and approval available
  

Dry Type, Vacuum Pressure Impregnated Transformers

Dynapower Corporation is pleased to offer our line of open wound dry type transformers. Developed in the United States for our internal use as the heart of our rectifier products, these transformers are designed for long and reliable service life in rugged industrial applications. Designed to be cooled using air or water, these transformers are also environmentally safe, which benefits the end user. 

• Custom electrical and mechanical designs available primarily for Industrial rectifier applications
• 10 kVA to 10 MVA  standard range with other options available
• 600 V to 15 kV class voltages
• 10 to 95 kV basic impulse levels
• All coils wound with copper conductors
• 150° C temperature rise levels standard with other options available
• DuPont Nomex® UL recognized 220° C insulation system
• During production, both primary and secondary windings are coated in polyester varnish and impregnated using a vacuum-pressure process and then baked to cure
• Convection cooled, forced air and direct water cooling system available
• Cores normally designed with a square cross section using a butt-lap joint design, fabricated from M6 grade grain oriented silicon steel. However, cruciform, step lap core, fabricated from other grades of steel are also available.
  
• Normally designed as major components of our rectifier systems, but numerous NEMA and specialty enclosure options are available as required.
• Nationally recognized testing laboratory (NRTL) inspection and approval available

Oil Immersed

Dynapower Corporation is pleased to offer our line of oil immersed transformers. Developed in the United States for our internal use as the heart of our larger rectifier products, these transformers are designed for long and reliable service life in rugged industrial applications. 

Custom electrical and mechanical designs are available for industrial rectifier applications

• 1000 kVA to 30 MVA  standard range with other options available
• 600 V to 69 kV class voltages
• 10 to 250 kV basic impulse levels
• 55° C temperature rise levels standard with other options available
• All coils wound with copper conductors.
• Convection cooled, forced air and direct water cooling system available. Radiators provided on air cooled systems while liquid-to-liquid heat exchangers with circulating systems are provided on liquid cooled systems as required.
• Cores normally designed with a square cross section using fabricated from M6 grade grain oriented silicon steel, although from other grades of steel and mechanical configurations are also available
• Mineral oil standard, although other oils, including environmentally friendly vegetable based materials, are available upon request
• Standard accessories for oil handling, maintenance and other safety features standard
• Primary and secondary bushings provided in appropriate terminal compartments as required
• Numerous NEMA and specialty enclosure options are available as required
• Nationally recognized testing laboratory (NRTL) inspection and approval available