225kVA Three Phase Cast Resin Dry Type Transformer 12470V to 480Y/277V ANSI/IEEE

This 225kVA three phase cast resin dry type transformer is designed for 12470V primary to 480Y/277V secondary power distribution in North American commercial buildings and light industrial facilities. Built with a NEMA 3R pad/floor mounted enclosure and configured to ANSI/IEEE C57.12.01 and DOE 2016 requirements, it suits utility-fed electrical rooms, outdoor equipment pads and facility service upgrades where medium-voltage supply needs to be stepped down for 480V equipment and 277V branch circuits.

Its cast resin dry type structure provides an oil-free installation advantage for projects where liquid containment, oil maintenance or indoor environmental restrictions must be considered. This makes it practical for facility distribution points that require enclosed equipment, service access and stable dry-type operation.

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

• NEMA 3R Enclosure
  Provides weather-resistant protection for indoor or outdoor pad/floor mounted installation.
• Cooling Fans
  Supports forced-air ventilation to help manage transformer operating temperature.
• Temperature Controller
  Monitors transformer temperature and supports alarm or control signal output.
• PT100 Temperature Sensors in LV Coil
  Detects winding temperature and sends accurate temperature signals to the controller.
• LV Copper Busbar
  Provides a reliable low-voltage connection point for outgoing power distribution.
• HV Copper Busbar
  Provides a defined high-voltage connection structure for primary-side wiring.
• 3 × 15A Fuse
  Provides primary-side circuit protection for the transformer.
• Auxiliary Transformer BK-1, 240V IN / 220V OUT
  Supplies control power for auxiliary devices inside the enclosure.
• Temperature and Humidity Controller
  Helps manage enclosure temperature and humidity for more stable internal conditions.
• Aluminum Alloy Heater
  Helps reduce condensation risk inside the enclosure in humid or low-load conditions.
• Fan Fuse
  Provides circuit protection for the cooling fan system.
• Comm Socket / Sensor Socket
  Provides connection points for communication and sensor wiring.
• Fault / Door-Open Signal / Fan / Alarm / Power Off / Power Indication
  Provides operating status signals for monitoring, alarm and maintenance reference.

• Sector: Commercial Buildings and Facility Service Entrances
  Suitable applications: Utility-fed 12.47kV service rooms, building distribution switchboards, HVAC power supply and 277V lighting distribution.
• Sector: Light Industrial Facilities
  Suitable applications: Workshops, small production areas, packaging lines, pumps, fans and 480V distribution panels.
• Sector: Outdoor Electrical Rooms and Customer-Owned MV Distribution Points
  Suitable applications: Outdoor equipment pads, facility electrical rooms, customer-owned medium-voltage distribution points and campus utility feeders.
• Sector: Retrofit and Replacement Projects
  Suitable applications: Replacing or upgrading existing 12.47kV to 480Y/277V dry-type transformers in commercial or industrial facilities.