Unit Substation Transformer


The Unit Substation Transformer is designed for commercial and industrial applications to convert distribution voltages to utilization voltages. They are constructed to interconnect easily with both primary and secondary switchgear. They can be used in outdoor or indoor (when filled with Envirotemp™ FR3™ Fluid) load center substations.

kVA 500-10,000
Primary Voltage Delta or Wye Connected 2400-43,800 V Delta 2400 V; 1000 kVA & Below
Secondary Voltage 208Y/120 V to 14,400 V


  • Envirotemp™ FR3™ fluid or electrical grade mineral insulating oil (upon special request)
  • De-energized tap changer, externally operable
  • Sidewall-mounted high-voltage porcelain bushings
  • Sidewall-mounted low-voltage molded epoxy bushings with NEMA spades
  • Tank bases designed for skidding or rolling in any direction
  • Extra-heavy, welded-in-place lifting lugs and jack pads (4)
  • Stainless steel grounding pads (4)
  • Cooling radiators are welded directly to the tank
  • Dial-type thermometer
  • Dial-type liquid level gauge
  • Pressure vacuum gauge
  • Cover mounted automatic pressure relief device
  • Pressure test connection
  • 1” upper fill plug with filter press connection
  • 1” drain valve with sampler combination (2500 kVA and below)
  • 2” drain valve with sampler (over 2500 kVA)
  • 1” upper filter valve (over 2500 kVA)
  • Painted using ANSI #61 Light Gray; ANSI #70 Sky Gray; or Special paint available per request
  • Laser-scribed anodized aluminum nameplate

Envirotemp™ and FR3™ are licensed trademarks of Cargill, Incorporated.