300kVA Cast Resin Dry Type Transformer 12470V to 480Y/277V Step-Down AN/AF ANSI/IEEE DOE 2016 Standards

This 225kVA three phase cast resin dry type transformer is configured for 12470V Delta primary to 480Y/277V grounded Wye secondary distribution. Built for pad or floor mounting with a ventilated NEMA 3R enclosure, it is suitable for commercial service entrances, building power upgrades, equipment areas and light industrial distribution points that need medium-voltage step-down power in a dry type format. The transformer is designed to meet ANSI/IEEE C57.12.01 and DOE 2016 requirements for North American projects.

The cast resin dry type construction keeps the transformer oil-free while providing a solid insulation system for facility power distribution. This makes it useful near buildings, equipment rooms and controlled electrical spaces where buyers want dry type operation without oil containment concerns.

Why Choose Us

1. Winley Electric manufactures cast resin transformers up to 10 MVA and 35 kV, designed in accordance with applicable ANSI/IEEE, AS 60076, IEC 60076 and related dry-type transformer standards.
2. Winley Electric cast resin transformers are engineered for demanding applications, offering high overload capability, low maintenance needs, strong mechanical strength, and reliable short-circuit withstand performance.
3. Winley Electric has extensive experience in cast resin transformer projects and can tailor product designs for solar PV, data centers, and other applications, including dual-split winding designs, multi-tap designs, and other customized electrical configurations.

Technical drawings

Standard Features

• Cast Resin Dry Type, Ventilated Configuration
  Provides an oil-free transformer structure for commercial and light industrial power distribution.
• Class F Insulation
  Supports dry type transformer operation with a defined 155°C insulation system.
• AA/FA Cooling with Forced Air Fans
  Allows self-air cooling with fan-assisted heat dissipation when additional cooling support is required.
• 5-Position Off-Circuit Tap Changer
  Provides ±2×2.5% voltage adjustment for matching site voltage requirements.
• Primary 40E Fuses
  Adds fused primary-side overcurrent protection for the medium-voltage input side.
• Electronic Temperature Monitor with Coil Sensors
  Monitors transformer temperature and supports alarm / trip signal indication.
• Space Heaters with Humidistat Control
  Helps control moisture and reduce condensation inside the enclosure.
• NEMA 3R Coated Steel Enclosure, Pad / Floor Mount
  Supports indoor or outdoor equipment placement with a floor-mounted enclosure structure.

• Commercial Building Power Distribution

Where it fits: Building service rooms, HVAC power supply, lighting panels and 480Y/277V distribution boards.

• Light Industrial Facilities

Where it fits: Workshops, pumps, fans, packaged equipment, auxiliary loads and local 480Y/277V power panels.

• Outdoor Electrical Rooms and Equipment Pads

Where it fits: Outdoor transformer pads, sheltered electrical rooms, equipment platforms and dry type replacement projects.

• Facility Distribution Networks

Where it fits: Campus distribution points, commercial facility substations, local step-down nodes and secondary distribution networks.