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Medium-voltage transformers

VFI single-phase pad-mounted transformer

Eaton’s Cooper Power series VFI single-phase pad-mounted transformer combines voltage transformation and sectionalizing in a compact, money-saving package. Delivering comprehensive system protection, the vacuum fault interrupter transformer enables utilities to dramatically reduce the duration and scope of outages while optimizing performance.

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Single-phase VFI pad-mounted transformer brochure Single-phase pad-mounted distribution transformers catalog
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Voltage class
10-167 kVA
VFI rating
200 A continuous
Interrupting Rating
12,000 A rms

Core features

  • Reduces the number of customers impacted by an outage by up to 50%
  • Cuts time required to locate a fault by up to 50%
  • Provides ultimate reliability and flexibility through an extensive range of programmable controls and settings
  • Ideal for residential applications where space is limited or inline fault or radial tap protection is difficult
  • VFI sectionalizing capabilities deliver superior system protection
  • Slashes installation costs, complexity and space requirements compared to separate single-phase transformer and switchgear installs
  • Helps improve SAIDI and SAIFI metrics
  • Utilizes industry-standard protection schemes to deliver unparalleled transformer overcurrent and fault protection
  • Provides ease of use with resettable breaker operation, programmability and coordination with upstream and downstream protection devices
  • Offers safety and security with deadfront construction, coupled with aesthetically pleasing, low-profile Shrubline (ANSI Type-2) design
  • 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

Decrease the duration and scope of outages

The VFI transformer is capable of isolating faults up to 50% faster than conventional fused equipment — and can cut the number of affected customers in half. By dramatically reducing downtime, the VFI helps utilities enhance customer satisfaction.

Get more protection in less space

Only Eaton combines a transformer and sectionalizer in the smallest possible footprint, providing unparalleled reliability for underground systems with faster installation at a lower overall cost.

One solution, multiple applications

The VFI transformer easily coordinates with upline and downline protective devices as system changes occur. Use to tap off a main underground feeder, in place of a three-way junction cable, to sectionalize points on a long or densely loaded feeder, in high potential cable failure areas and as a tie point between two systems.

Eaton’s single-phase VFI pad-mounted transformer

Learn about Eaton’s Cooper Power series single-phase VFI pad-mounted transformer and its features to minimize the size and duration of power outages within the underground distribution system.

Specifications

Ratings

  • Shrubline VFI 50 or 60 Hz (10-167 kVA)
    • Primary voltage: 2400-19,920 V
    • Secondary voltage: 120-600 V
    • ANSI Type-2 frontplate

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
  • Vacuum Fault Interrupter (VFI) for electronic breaker trip control
  • VFI rating: 200 A continuous; 12,000 A rms interrupting rating (single-phase) with tri-phase control
  • 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
  • Quality System ISO 9001 certified
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