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Medium-voltage transformers

Completely self-protected single-phase pad-mounted transformer

Eaton’s Cooper Power series completely self-protected (CSP) single-phase pad-mounted transformers are designed for 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 10-75 kVA (or 10-167 kVA with a MagneX interrupter), CSP transformers meet or exceed the requirements of applicable ANSI and NEMA standards. CSP transformers can be filled with standard electrical grade mineral insulating oil or fire-resistant FR3 fluid.

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Single-phase pad-mounted distribution transformers catalog Fundamentals of medium-voltage transformers
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Voltage class
10-167 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
  • 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
  • Cores and coils designed for high reliability and low field failure rates: Available in grain-oriented electrical or amorphous steel
  • Tin-plated high- and low-voltage bushing terminals to accommodate aluminum or copper conductors
  • Available in MaxiShrub with an ANSI Type-1 frontplate or Shrubline with an ANSI Type-2 frontplate which allows for a lower profile for improved aesthetics

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; low-voltage distribution class MOV arrester; and internal or external lightning arresters. Eliminates the need to install external overcurrent devices and simplifies power restoration.

The safer, environmentally friendly choice

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.

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.
Specifications

Ratings

  • MaxiShrub and Shrubline 50 or 60 Hz
    • 10-75 kVA (secondary breaker)
    • 10-167 kVA (MagneX Interrupter)
    • Primary voltage: 2400-19,920 V
    • Secondary voltage: 120-600 V

Specifications

  • Meet or exceeds ANSI, NEMA and DOE2016 standards
    • IEEE standards C57.12.00, C57.12.38, C57.12.28, 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 C57.12.28-2005 and C57.12.29-2005 standards (stainless steel units only)
  • Full compliance with IEEE Std C57.12.28-2005 standard enclosure integrity requirements
  • 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
  • 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:
    • 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 pad-mounted distribution transformers catalog
    This catalog provides ratings and ordering information for Eaton’s Cooper Power series single-phase pad-mounted distribution transformers which are available in standard ratings and configurations or can be customized to meet specific needs and are available as Shrubline, MaxiShrub and Ranch Runner transformers.
    (PDF 2 MB , 04/01/2018)
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