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Medium-voltage transformers

Completely self-protected single-phase overhead transformer

Eaton’s Cooper Power series completely self-protected (CSP) single-phase overhead transformers deliver exceptional performance. With direct connected primary arresters, a MagneX interrupter or a secondary circuit breaker with internal primary voltage fuses, the CSP transformers eliminate the need for separately mounted protective devices while reducing installation costs. Available from 5-75 kVA (or 5-167 kVA with a MagneX interrupter), 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
2400-19,920 V
Secondary Voltage
120-600 V

Core features

  • Utilizes internal overcurrent devices and arresters for overvoltage protection without the need for separate external protection devices
  • Utilizes a secondary breaker with weak link or an optional MagneX interrupter for secondary fault and overload protection
  • Meets or exceeds industry standards including ANSI, NEMA and DOE Energy Efficiency
  • Constructed with EPRI-recommended interlaced core-type design
  • 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

Internalized protection for installation cost savings

Transformers can be deployed with a variety of protection options, including a MagneX interrupter or a secondary breaker with weak link for secondary fault and overload protection; a primary weak link fuse; a current-limiting fuse for high interrupting ratings and limiting fault currents; a low-voltage distribution class MOV arrester; and internal or external lightning arresters. These protection options eliminate the need to install external overcurrent devices and simplifies power restoration.
Evolution surge arrester brochure

Available with multiple fluid options

For fire-sensitive locations, FR3 fluid is recommended in transformers. The fire-resistant, natural ester-based fluid also offers the benefits of a soy oil-based dielectric coolant that is sustainable and has unique environmental and material properties. Transformers may also be filled with standard electrical grade mineral insulating oil.
FR3 fluid information

Enhanced protection with optional MagneX interrupter

Eaton's Cooper Power series MagneX interrupter is an overcurrent protective device that protects distribution transformers from damaging overloads and secondary faults, and is also used for switching the transformer “on” or “off”. As a transformer protective device, the MagneX interrupter combines safety and efficiency with economic operation. It is designed for use in transformer (mineral) oil or FR3 fluid-filled transformers.
MagneX interrupter catalog
Specifications

Ratings

  • Completely self-protected 50 or 60 Hz (CSP 5-75 kVA)
    • Primary voltage: 2400-19,920 V
    • Secondary voltage: 120-600 V
  • MagneX interrupter-protected 50-60 Hz (5-167 kVA)
    • Primary voltage: 2400-19,920 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
  • 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
  • Configurable to Rural Utilities Service (RUS) specification
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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