PEAK Substation Transformer


Eaton's Cooper Power series PEAK™ transformers are uniquely designed to allow you additional capability to manage increased loads and temporary overload capacity without loss of life expectancy when compared to mineral oil-filled transformer alternatives.

Utilizing an advanced high-temperature insulation system approach — comprised of thermally upgraded kraft paper, Envirotemp™ FR3™ dielectric fluid, and an optimized core and coil design — a 75 °C Average Winding Rise (AWR) PEAK transformer results in a smaller footprint and a lighter unit capable of the same ratings as a physically larger 65 °C AWR rated unit.

Ratings 500 – 6667 kVA (Single-Phase); 300 – 12,000 kVA (Three-Phase)
Average Winding Rise (AWR) 75 °C
Average Winding Rise (AWR) Slash Ratings 55/75 °C and 65/75 °C
Overload Capacity At Least 112%
Primary Voltage 2,400 – 46,000 V
Secondary Voltage 208Y/120 V to 24,940 V Wye
Specialty Designs Inverter/Rectifier Bridge; Zig Zag; K-Factor (up to K-19); Solar/Wind Designs; Differential Protection; Seismic Applications (including OSHPD); Hazardous Locations (Class 1 Div 2); Automation Solutions


  • Overcurrent protection using Cooper Power Systems proven Vacuum Fault Interrupter (VFI) technology
  • Envirotemp™ FR3™ fluid
  • 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.