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Medium-voltage transformers

Conventional single-phase overhead transformer

Eaton's Cooper Power series single-phase conventional overhead transformers are designed for exceptional performance. Available in ratings from 5-167 kVA, the transformers are designed with an interlaced core (5-50 kVA), which is recommended by the Electric Power Research Institute (EPRI). Conventional transformers meet or exceed the requirements of applicable ANSI and NEMA standards. Single-phase overhead transformers can be filled with standard electrical grade mineral insulating oil or fire-resistant FR3 fluid.

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Single-phase overhead transformers catalog Oil-filled, single-phase overhead distribution transformer instructions
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Voltage class
5-167 kVA
Primary voltage
2400-34,500 V
Secondary voltage
120-600 V

Core features

  • Available option of FR3 fluid for increased fire safety or electrical grade mineral oil
  • Meets or exceeds industry standards including ANSI, NEMA and DOE Energy Efficiency
  • Constructed with EPRI-recommended interlaced core-type design for greater resistance to low-side voltage surges
  • Polymer low-voltage bushings are standard at 5-50 kVA
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel
  • Domed cover design and formed cover band provide increased pressure withstand capability, eliminate bushing overhang and improve cover retention
  • High-voltage bushing design improves gasket protection and seal
  • Configurable to Rural Utilities Service (RUS) specification

Optimum field performance

Eaton's Cooper Power series transformer cores and coils are designed and manufactured to provide the most reliable performance and the industry’s lowest failure rate. Advanced quality management, combined with exhaustive testing, assures unparalleled reliability and operation.

The safer, environmentally friendly choice

Single-phase conventional transformers can be filled with optional FR3 fluid, which provides increased fire safety and superior environmental characteristics where less-flammable fluid is desired. Because the fluid is readily biodegradable and non-toxic, FR3 fluid provides sustainable performance at a low cost.
Specifications

Ratings

  • Conventional 50 or 60 Hz (5-167 kVA)
    • Primary voltage: 2400-34,500 V
    • Secondary voltage: 120-600 V

Specifications

  • Meets or exceeds ANSI, NEMA and DOE2016 standards
    • IEEE, C57.12.00, C57.12.20, C57.12.31, C57.12.35, C57.12.90, C57. 91 and C57.154
    • NEMA standards, NEMA TR 1 (R2000)
    • Department of Energy Efficiency Standard, 10 CFR Part 431
  • Tank coating exceeds IEEE Std C57.12.31-2010 standard
  • Cover with a minimum dielectric strength of 8 kV
  • Configurable to Rural Utilities Service (RUS) specification
  • FR3 fluid or electrical grade mineral oil
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel
  • Heavy-duty lifting lugs and hanger brackets per ANSI requirements up to 4500 lbs
  • The transformer shall be designed in accordance with this specification and shall have an Average Winding Rise (AWR) of one of the following:
    • 55 °C, 55/65 °C, 65 °C
    • The applicable AWR rating shall be specified on the inquiry
  • The transformer shall be designed in accordance with this specification and shall have one of the following kVA ratings:
    •  5, 10, 15, 25, 37.5, 50, 75, 100, 167
    • The applicable kVA rating shall be specified on the inquiry
  • Quality System ISO 9001 certified
Download Links
  • Commercial and industrial medium-voltage electrical distribution products brochure
    This brochure outlines Eaton’s Cooper Power series broad commercial and industrial medium-voltage transformer, switchgear, fuse, sectionalizer, switch, regulator, tool, OEM equipment, cable accessory, lightning arrester, power capacitor and recloser offerings.
    (PDF 2 MB , 01/24/2023)
  • Storm season rapid response information
    Eaton’s Cooper Power series product team works together with the engineering services team to provide a full storm response procedure to quickly ramp up operations in anticipation of storm impact for fast product shipment and remediation of damaged apparatus during storm recovery.
    (PDF 619 KB , 07/25/2019)
  • Single-phase overhead transformers catalog
    This catalog provides ratings and ordering information for Eaton’s Cooper Power series single-phase overhead-type distribution transformers which are available as conventional (5-167kVA), completely self-protected (CSP 5-75kVA) or MagneX interrupter-protected (5-167kVA).
    (PDF 150 KB , 08/01/2015)
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