2/2.667MVA Dual-Rating Capacity Three Phase VPI Dry Type Transformer 6900V to 480Y/277V DOE 2016 ANSI/IEEE Standards

This 2/2.667 MVA VPI dry type transformer steps 6900V Delta down to 480Y/277V Wye-N for medium-voltage facility distribution. The AN/AF rating supports 2 MVA self-cooled operation and 2.667 MVA fan-assisted capacity, helping the unit handle normal loads and peak demand in one configuration.

Built with a NEMA 3R pad/floor mount enclosure, copper windings, Dyn11 vector group, 5-position de-energized taps and LV winding temperature-controlled fans, this transformer is suitable for commercial buildings, industrial plants, outdoor electrical rooms and facility power systems requiring stable 480Y/277V distribution.

Technical drawings

Standard Features

• Upper Clamping Beam
  Secures the core and coils against vibration and movement.
• Insulating Support Blocks
  Provides support and insulation.
• Three-Phase Windings
  Transfers electrical energy through electromagnetic induction.
• Laminated Iron Core
  Provides the magnetic path and reduces core losses.
• LV Busbar
  Collects and delivers LV current.
• LV Phase Terminals
  Connects three-phase LV output cables or busbars.
• Lifting Lugs
  Provides lifting points for handling and installation.
• Insulation Air Ducts
  Provides cooling air gaps and insulation support.
• Lower Clamping Beam
  Clamps the core and coils in place.
• Bottom Base Frame
  Supports the transformer and allows installation fixing.

• Commercial Buildings
  Suitable for commercial facilities requiring 6900V to 480Y/277V power distribution, such as building service entrances, HVAC systems, lighting panels and low-voltage switchgear.

• Light Industrial Facilities
  The 2/2.667 MVA AN/AF capacity supports plant distribution, workshop power supply, production equipment and auxiliary facility loads where both normal load and peak demand need to be considered.

• Outdoor Electrical Rooms
  With a NEMA 3R pad/floor mount enclosure, the transformer is suitable for outdoor or semi-outdoor electrical rooms where oil-free dry type equipment is preferred.

• Facility Power Distribution Systems
  The 480Y/277V secondary output can supply common North American facility loads, including lighting, HVAC, panels, motors and downstream distribution equipment.

• Data Center and Critical Facility Support
  LV winding temperature sensors, fan control, alarm and trip contacts make the transformer suitable for controlled power environments where thermal monitoring and load stability are important.

• Campus and Infrastructure Projects
  Suitable for campus buildings, public facilities and infrastructure power rooms requiring medium-voltage step-down to 480Y/277V distribution.