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Heavy-Duty Dry Type & Epoxycast Power Transformers (600V to 34.5kV)

At AFP Transformers Corp., we design, engineer, and manufacture custom dry-type power transformers operating across 600 V to 34.5 kV voltage classes. Engineered specifically for harsh industrial applications, commercial utility switchgear, and mission-critical power distribution systems, our power transformers offer robust environmental protection, high thermal endurance, and precise impedance matching.

Purchasing engineers and global OEMs rely on our dual manufacturing capabilities: traditional Vacuum Pressure Impregnation (VPI) dry-type construction and solid Epoxycast® coil technology where windings are encapsulated in tough, moisture-impervious epoxy resin. Whether you require open core-and-coil assemblies for control panel integration or fully enclosed outdoor pad-mount unit substations, AFP delivers customer-focused engineering with fast turnaround schedules.

VPI Dry-Type Power Transformer Core & Coil Assembly
VPI Dry-Type Core & Coil
High Voltage Epoxycast Solid Resin Encapsulated Coil Transformer
Epoxycast® Resin Coil
Custom NEMA 3R Outdoor Enclosed Power Transformer
Enclosed Unit Substation
Three Phase Medium Voltage Industrial Power Distribution Transformer
Medium Voltage Unit
Engineering Specifications

Power Transformer Capabilities

Voltage Classes
  • 600 V Class
  • 5 kV Medium Voltage
  • 15 kV Industrial Class
  • 34.5 kV Distribution Class
Phase Configurations Single Phase, Two Phase, Three Phase, and Multi-Phase Custom Vector Configurations
Construction Methods Traditional Vacuum Pressure Impregnated (VPI) Dry Type; Cast Coil (Epoxycast® Solid Resin Encapsulated)
Winding Materials Oxygen-Free Copper, Electrical-Grade Aluminum, High-Conductivity Foil Windings, Precision Magnet Wire
Enclosure Options
  • Open Core & Coil (OEM Panel Mount)
  • NEMA 1 & NEMA 2 Indoor Vented
  • NEMA 3R Weatherproof / Outdoor
  • NEMA 4 & NEMA 4X Sealed / Stainless
  • NEMA 12 Dust-Tight Industrial
  • Substation & Pad-Mount Designs
Thermal & Insulation Rating Class H (220°C Insulation System), Up to 150°C Temperature Rise Design
Optional Enhancements
  • RTD Temperature Readout Indicators
  • Forced Air Cooling (KVA Boost Fan Kits)
  • Primary & Secondary Fusing Integration
  • Primary/Secondary Surge Arrestors
  • Condensation Control Heaters
  • Impedance-Matched Custom Designs
Quality & Routine Testing

100% Factory Inspection & Test Verification (IEEE C57.12.91)

Every unit undergoes strict quality control and parameter verification prior to shipment. Test data log records voltage ratios, excitation current, load/no-load losses, impedance, and power factor efficiency.

  • Applied Potential (HiPot) up to 100 kV AC RMS
  • Basic Impulse Level (BIL) testing up to 300 kV
  • Partial Discharge Testing (up to 100 kV applied / >70 kV induced)
  • Custom Customer-Witnessed Testing Available
Production & Stocking Programs Prototypes, Low-Volume Custom Runs, High-Volume OEM Orders. Available JIT (Just-In-Time) shipping, Kanban consignment, and Min-Max inventory management programs.
Production Lead Time Standard turnaround in 3 to 6 weeks. Expedited emergency manufacturing available in as little as 1 week.
Regulatory & Application Framework

Standards Compliance & Applications

North American Standards

  • IEEE C57.12.01 & C57.12.91General Requirements & Test Code for Dry-Type Power Transformers.
  • UL 1561 & UL 1562Standards for General Purpose & Medium Voltage Dry-Type Transformers (up to 34.5kV).
  • UL 506 & UL 508Specialty Transformer & Industrial Control Equipment Compliance.
  • NEMA ST 20, TR1 & ICS 2Standard specifications for dry-type industrial controllers & reactors.

International & Marine

  • IEC 60076 & IEC 61558International electrotechnical codes for medium voltage power transformers & reactors.
  • CE Mark CertificationCompliant with European Low Voltage and Electromagnetic Compatibility Directives.
  • ABS & DNV CertificationAmerican Bureau of Shipping & Det Norske Veritas approvals for marine duty.

Target OEM Applications

  • Power Distribution & ControlSwitchgear, Motor Control Centers (MCC), PDU & UPS systems, Voltage Regulators.
  • Industrial Thermal SystemsFurnace power supplies, induction heating, microwave and RF power machines.
  • Severe Environment DutyMining machinery, wastewater treatment, chemical plants, semiconductor tools.

Request Technical Specifications & B2B Quotations

Engineered for maximum operational uptime, custom electrical specs, and global compliance. Contact our application engineering team today to review your transformer design parameters.

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