500kVA Cast Coil Dry Type Transformer 12470V to 480Y/277V Three Phase Exposy

Designed for medium-voltage facility distribution, this 500kVA three phase cast resin dry type distribution transformer converts 12470V primary power to 480Y/277V secondary power for 60Hz systems. The unit is configured with Dyn1 vector group, aluminum windings, Class F insulation, 80°C temperature rise, AN/AF cooling, and a NEMA 3R coated steel enclosure for electrical rooms, commercial service distribution, and light industrial power supply. The design is specified to ANSI C57.12.01 and DOE 2016 requirements.

The cast resin dry type structure gives buyers an oil-free transformer format for sites that need enclosed medium-voltage conversion with fan-assisted cooling, temperature monitoring, and practical field access through pad or floor mounting.

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

• HV Terminals
  Connection points for the three-phase primary input, allowing the transformer to receive medium-voltage power from the upstream distribution system.
• LV Terminals
  Connection points for the secondary output, allowing LV cables or busbars to connect the transformer to downstream distribution equipment.
• Cast-Resin Winding Coils
  Encapsulated winding coils provide the main voltage transformation function and support dry type, oil-free operation.
• Tap Terminals
  Allow voltage adjustment through different tap positions to match site voltage conditions during installation and commissioning.
• Insulating Support Blocks
  Support the coils and help maintain electrical clearance between live parts and structural components.
• Phase Connection Leads
  Connect the phase windings according to the required vector group and internal electrical connection design.
• Iron Core
  Provides the magnetic path for energy transfer and supports stable transformer operation.
• Lower Clamping Beams
  Secure the core and winding assembly, helping maintain structural stability during handling and operation.
• Lifting Lugs
  Provide lifting points for handling, positioning, and installation.
• Bottom Base Frame
  Supports the transformer body and provides the mounting base for floor or enclosure installation.
• NEMA 3R Weatherproof Enclosure
  Coated steel enclosure designed for indoor/outdoor installation, helping protect the transformer in electrical rooms, service pads, and protected outdoor distribution areas.
• AN/AF Cooling System with Fans
  Natural air and forced-air cooling support transformer temperature control under operating load, with fans installed on both HV and LV sides.

Commercial Buildings

Suitable for office buildings, hospitals, shopping centers, schools, and mixed-use facilities requiring 12470V to 480Y/277V power distribution. The 500kVA capacity supports common building loads such as HVAC equipment, lighting panels, pumps, elevators, and low-voltage distribution switchgear.

Indoor Electrical Rooms

Designed for dedicated transformer rooms, mechanical and electrical rooms, service entrance rooms, and protected equipment areas inside commercial or industrial facilities. The cast resin dry type structure provides an oil-free transformer format for enclosed power distribution spaces.

Light Industrial Facilities
Suitable for workshops, production support buildings, small manufacturing plants, maintenance buildings, and auxiliary power distribution areas. The 15kV-class primary input and 480Y/277V secondary output make the transformer practical for facility-level equipment power supply.

Facility Retrofit and Service Upgrade Projects

Applicable for transformer replacement, medium-voltage service upgrades, electrical room renovation, and projects converting 12470V service to 480Y/277V utilization voltage. The pad/floor mount design and 5-position tap adjustment support practical installation and commissioning in existing facility spaces.