500kVA Cast Resin Dry Type Distribution Transformer 12470Y/7200V to 480Y/277V NEMA 3R ANSI/IEEE Standards

This 500kVA dry type distribution transformer is suitable for commercial buildings, utility distribution points, industrial service entrances, and outdoor electrical equipment areas requiring 480Y/277V power from a 12.47kV distribution feeder. It is configured as a cast resin dry-type transformer with 12470Y/7200V primary voltage to 480Y/277V secondary voltage, three-phase YNyn0 connection, AN cooling, and pad/floor mounting inside a NEMA 3R weatherproof coated steel enclosure.

The 95kV HV BIL, 30kV LV BIL, Class F insulation, 80°C temperature rise, 5-position HV tap adjustment, terminal lug connections, space heaters with humidistat control, and electronic temperature monitoring system help match common North American project specifications. For inquiry or specification review, buyers can confirm site voltage, kVA, enclosure requirement, tap range, standards, accessories, and destination port.

Technical drawings

Standard Features

• Electronic temperature controller
  Equipped with a BWD-3K130A dry transformer microcomputer controller for winding temperature monitoring, fan control interface, alarm indication, over-temperature indication, fault signal, and power cut signal.

• Winding temperature sensors
  Temperature sensor wiring is provided for monitoring transformer winding temperature and supporting alarm or trip signal output through the controller.

• Humidity and temperature sensors inside the enclosure
  The enclosure includes humidity and temperature sensors to support environmental monitoring inside the cabinet, especially for outdoor or variable-humidity installation conditions.

• Space heater with humidity/temperature control
  An aluminum alloy space heater is installed inside the enclosure and works with humidity/temperature control to help reduce internal moisture accumulation.

• 240V auxiliary transformer
  A 240V auxiliary transformer is included to support internal control power supply requirements for enclosure accessories and monitoring devices.

• Alarm light for operating status indication
  A red alarm indicator light is installed inside the enclosure, supporting visible status indication for alarm, over-temperature, or control-related signals.

• Door-open signal interface
  The controller wiring area includes a door-open signal interface, supporting cabinet status monitoring when required by the project.

• Alarm, fault, fan and power cut terminals
  The temperature controller provides terminals for alarm, fault, fan, and power cut functions, allowing integration with transformer protection or monitoring circuits.