112.5kVA Cast Resin Dry Type Transformer Medium Voltage 12470V to 480Y/277V ANSI/IEEE Standards

For facilities that need to step medium-voltage service down to usable building power without using an oil-filled transformer, this 112.5kVA three phase cast resin dry type distribution transformer provides 12470V Delta to 480Y/277V grounded Wye conversion in a ventilated NEMA 3R enclosure. It is suitable for commercial service entrances, light industrial panels, facility auxiliary loads and customer-owned distribution points where dry-type construction and pad or floor mounting are preferred.

Its main advantage is the cast resin dry type structure: it keeps the transformer oil-free while supporting installation near buildings, equipment areas or controlled electrical spaces where leakage containment and routine access matter.

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 Structure
  Provides oil-free insulation for medium-voltage step-down applications, reducing concerns related to oil leakage and oil containment in building-side or facility distribution areas.
• NEMA 3R Pad/Floor Mount Enclosure
  Supports indoor, outdoor or semi-outdoor installation where the transformer needs enclosure protection and a fixed floor-mounted layout.
• HV-Side 15A Fuses
  Provides primary-side overcurrent protection and helps protect the transformer against abnormal fault conditions from the incoming medium-voltage side.
• AA/FA Cooling Fans / AA/FA
  Allows the transformer to operate with natural air cooling and fan-assisted cooling when additional thermal dissipation is required.
• PT100 Temperature Sensors in LV Coil
  Monitors winding temperature and provides temperature data for fan control, alarm or protection logic.
• Electronic Temperature Monitor System
  Provides fault, alarm, fan and power status signals, helping operators identify thermal or control-system conditions during operation.
• Space Heaters with Humidistat Control
  Helps reduce condensation risk inside the enclosure, especially for outdoor, semi-outdoor or high-humidity electrical rooms. 
• Door-Open Signal Switches
  Detects door opening status and can be used for door-open alarm or auxiliary safety indication.

• Sector: Commercial building power supply
  Suitable applications: Commercial service entrances, electrical rooms and building distribution systems requiring 12470V medium-voltage input to 480Y/277V low-voltage output.
• Sector: Light industrial facilities
  Suitable applications: Small production areas, workshops, process support panels, HVAC loads and 480V distribution boards.
• Sector: Outdoor or semi-outdoor distribution points
  Suitable applications: Protected exterior equipment pads, facility distribution yards and customer-owned medium-voltage service points.
• Sector: Facility auxiliary power
  Suitable applications: Water treatment facilities, pumping stations, infrastructure buildings and auxiliary service panels supplied from a 12.47kV feeder.
• Sector: Retrofit and specification replacement projects
  Suitable applications: Replacement of existing dry-type distribution transformers where voltage, BIL, impedance, dimensions and enclosure requirements must be reviewed before ordering.