Dry-Type Transformers
Air-cooled transformers ideal for indoor installations, fire-sensitive environments, and locations where oil containment is impractical. Cast resin and VPI designs from 15 kVA to 30 MVA.
Quick Specs
- Capacity Range
- 15 kVA – 30 MVA
- Primary Voltage
- 600V – 35 kV
- Secondary Voltage
- 120V – 15 kV
- Insulation Class
- Class F (155°C) / Class H (180°C)
- Enclosure
- NEMA 1, 2, 3R, 12 Available
Technical Specifications
Key Advantages
- No oil—eliminates fire and environmental hazards
- Cast resin encapsulation for moisture and dust protection
- Low partial discharge for sensitive environments
- Compact footprint for space-constrained installations
- Indoor and outdoor rated enclosures
- Class F and H insulation systems
- Temperature monitoring and fan control options
- K-factor rated designs for non-linear loads
Applications
Commercial Buildings
High-rise offices, shopping centers, and mixed-use developments where fire safety is paramount.
Healthcare Facilities
Hospitals, clinics, and medical centers requiring clean, quiet, and safe power.
Data Centers
Server rooms and IT facilities where oil-free operation and compact size matter.
Industrial Indoor
Manufacturing facilities, clean rooms, and environmentally sensitive operations.
Frequently Asked Questions
What is the difference between cast resin and VPI dry-type transformers?
Cast resin transformers have windings encapsulated in epoxy resin, providing excellent moisture and contamination resistance. VPI (Vacuum Pressure Impregnated) transformers use varnish impregnation and are typically more cost-effective for less demanding environments.
Can dry-type transformers be installed outdoors?
Yes, with proper enclosures (NEMA 3R or higher). Outdoor-rated dry-type transformers include weatherproof housings, heaters, and ventilation systems designed for external installation.
What is K-factor rating and do I need it?
K-factor indicates a transformer's ability to handle harmonic currents from non-linear loads like computers, VFDs, and LED lighting. If your facility has significant electronic loads, a K-4, K-13, or K-20 rated transformer prevents overheating.
Are dry-type transformers more expensive than oil-filled?
Initial cost is typically higher, but dry-type transformers eliminate oil containment, fire suppression, and environmental compliance costs. Total cost of ownership is often comparable or lower for indoor installations.
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