Power Transformers

At AFP Transformers, we offer dry type power transformers in 600 V to 34.5 kV voltage classes. Power transformers may either be traditional dry type transformers manufactured using VPI processes or Epoxycast transformers which have coils directly cast into a tough epoxy material. Transformers are available as open core and coil configuration for integration into panels, or contained in enclosures. Enclosure options include pad-mount, unit substation designs, and all standard NEMA enclosures including stainless steel. An abundance of standard designs are available to fit many applications, but our engineers also have extensive experience in developing custom products for specialty applications. This versatility allows us to efficiently produce transformers at any production volume while maintaining competitive prices and providing fast turnaround.

Additional features can be incorporated in the transformer design as the application dictates. Optional features include readouts and indicators, forced air cooling to increase operating kVA percentages, and surge protectors. Most orders are completed in 3 to 6 week with expedited orders completed in as little as one week. A variety of inventory management and stocking options are also available including Kanban systems and JIT shipping services. For additional information about our power transformers, see the table below, or Contact Us directly.

Power Transformers Capabilities

Transformer Type
Power Transformers
Power Type
Single Phase
Two Phase
Three Phase
Multi-Phase
Voltage Class
600 V
5 kV
15 kV
34.5 kV
Construction
Traditional Dry Type
Cast Coil (Epoxycast®)
Configurations
Open Core & Coil
NEMA Enclosures
Pad-Mount
Unit Substation Designs
Winding Material
Copper
Aluminum
Magnet Wire
Foil
Enclosure Types & Options
NEMA 1
NEMA 2
NEMA 3R
NEMA 4
NEMA 4X
NEMA 12
Drip Proof
Non-Ventilated
Totally Sealed
Stainless Steel
Indoor
Outdoor
Rain Shields
Custom
Insulation Thermal Rating
Up to 150°C Rise
Additional Features & Options
Temperature Readout Indicators
Feedback Circuits
Condensation Prevention Controls
Forced Air Cooling
Common Rectifier Duty Ratings
Lighting/Surge Arresstors
Primary Fusing
Secondary Fusing
Impedance Matched Designs
Loss-Evaluated Designs
Testing & Inspection
100% Product Testing
IEEE C57.12.91 Special, Standard, or Custom
Testing Parameters Stored
  • Voltage
  • Current
  • Watts
  • Vars
  • VA
  • Power Factor
  • Efficiency
Applied Potential (HiPot) Testing to 100 kV AC RMS
BIL capability up to 300 kV
Partial Discharge Testing
  • Up to 100 kV applied potential
  • In excess of 70 kV induced potential
Customer Specified Testing as Requested
Stocking Programs
Kanban
JIT Shipping
Min-Max
Custom
Production Volume
Prototype
Low Volume
High Volume
Lead Time
3 to 6 Weeks Typical
Expedited Turnaround in as little as 1 Week

Additional Information

Industry Focus & Applications
Switchgear Manufacturers
Motor Control Center Manufacturers
Utilities
Power Factor Correcting Equipment Manufacturers
Power Conditioning Equipment Manufacturers
  • PDU manufacturers
  • UPS manufacturers
  • Voltage Regulator Manufacturers
  • Data Center CPUs
Industrial Heating Equipment Manufacturers
  • Furnaces
  • Induction Heating Power Supplies
  • RF and Microwave Heating Machines
Mining Machine Manufacturers
Waste Water Treatment
OEM Machine Manufacturers
  • Machine Toolmakers
  • Packaging Machines
  • Semiconductor Machine Manufacturers
  • Web Processing Machine Manufacturers
Industry Standards
IEEE C57.12.01
General Requirements for Dry-Type Distribution & Power Transformers, Including Solid Cast
IEEE C57.12.91
Standard Test Code for Dry-Type Distribution & Power Transformers
UL 508
UL Standard for Industrial Control Equipment
UL 506
UL Standard for Specialty Transformers
UL 1561
Industry Standard for Dry Type General Purpose & Power Transformers, 600 Volt Class
UL 1562
Industry Standard for Dry Type General Purpose & Power Transformers, Medium Voltage, Up to 34.5 KV
NEMA ST 20
Standard for Dry Type Transformers for General Applications
NEMA TR1
Test Code for Transformers, Regulators & Reactors
NEMA ICS 2
Industrial Standard for Controllers, Contactors, Overload Relays & Related Equipment. (Motor Starting Autotransformers & Reactors)
International Standards
IEC 60076
Power Transformer & Reactors - Medium Voltage
IEC 61558
Power Transformers & Reactors - 600 Volt Class
CE Certification to IEC Standards
Marine Standards
ABS
American Bureau of Ships
DNV
Det Norske Veritas