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Medium-voltage transformers
PEAK single-phase overhead transformer
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PEAK single-phase overhead transformer

Eaton’s Cooper Power series single-phase overhead PEAK transformers provide the capability to manage increased loads and temporary overload conditions without accelerating loss of insulation system life, compared to mineral oil-filled alternatives. The transformers’ overload capacity enables utilities to operate beyond full-rated load to at least 109 %, while their smaller, lighter footprint further enhances value.

PEAK single-phase overhead transformer
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Voltage class
5-167 kVA
Average winding rise (AWR) / slash ratings
75˚ C / 55/75 °C and 65/75 °C
Primary voltage
2400-34,500 V

Core features

  • PEAK transformers are designed to improve performance with longer insulation life and offer compact dimensions, lighter weight, safety and sustainability
  • Superior moisture and thermal stress managing capabilities allow for extended insulation system life and enhanced reliability
  • Utilizes an advanced high-temperature insulation system comprised of thermally upgraded kraft paper, Envirotemp FR3 dielectric fluid and an optimized core and coil design
  • Available in 5-167 kVA single-phase pole-mount designs; 75 °C AWR and 65/75 °C AWR options
  • 75 °C Average Winding Rise (AWR) of PEAK transformer offers the same ratings as a physically larger and heavier 65 °C AWR rated unit
  • A 65/75 °C slash rated PEAK transformer is comparable in size to a conventional transformer but has nameplated overload capability
  • Meets or exceeds industry standards including ANSI, NEMA and DOE Energy Efficiency
  • Available in conventional or CSP designs for various overcurrent protection options
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel

Better manage temporary overload capacity

PEAK single-phase transformers can be loaded continuously 9% beyond full-rated base load, helping utilities to more precisely size transformers based on periods of peak demand — without accelerated reduction of insulation life.

Gain additional load capacity

Designed to accommodate heavier base loading for longer periods without accelerating loss of insulation system life, PEAK single-phase transformers can be loaded continuously 9% beyond full rated base load.

Improve reliability

With superior moisture and thermal stress managing capabilities, PEAK transformers extend insulation system life, improving overall system reliability by reducing outages and transformer failures.
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Eaton’s mission is to improve the quality of life and the environment through the use of power management technologies and services. We provide sustainable solutions that help our customers effectively manage electrical, hydraulic and mechanical power – more safely, more efficiently and more reliably. Eaton’s 2019 revenues were $21.4 billion, and we sell products to customers in more than 175 countries. 
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