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Medium-voltage switchgear

VFI Vacuum Fault Interrupter switchgear

Eaton's Cooper Power series VFI vacuum fault interrupter switchgear provides an environmentally preferred, safer and more reliable approach to medium-voltage switching and protection. Additionally, it features dead-front construction and enhanced operating features for added safety, all completely immersed within a sealed, insulated medium.

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Resettable vacuum fault interrupter
Immediate service restoration
Deadfront Construction
Optimal operator safety
Automation ready
Enhanced protection, operation and communications

Core features

  • FR3 or E200 fluid, environmentally-preferred switchgear dielectrics is optional, as well as mineral oil or SF6 Gas
  • Eliminates the risk of contaminating the insulating medium with its vacuum switching
  • Improves safety for utility personnel and the general public with dead-front construction
  • Offers single- or three-phase tripping, and optional visible-break as well as grounding switches for added safety
  • Provides a flexible solution for time-current curve coordination with optional tri-phase electronic control
  • Edison Idea relays or SEL relays are optional to allow enhanced protection and communication functionality 

Smart VFI switchgear available with SEL-751 and SEL-501 feeder protection relays

Eaton offers SEL-751 and SEL-501 relays to provide microprocessor-based protection for Cooper Power series Smart VFI switchgear. The SEL-751 relay provides advanced protection for one three-phase source or tap, as well as motor control capabilities. The SEL-501 relay provides overcurrent protection for two three-phase taps.

Enhanced protection and communication functionality

Edison Idea and IdeaPLUS relays meet all applicable relay standards, including IEEE Std C37.90-2005 and IEEE Std 1547-2003 standards. iDP-210 relay provides multi-function protection elements for one source or tap. iTAP-265 relay provides overcurrent protection for two three-phase taps. iTAP-260 relay provides overcurrent protection for two three-phase taps with independent settings for each phase. Each phase can be independently tripped.

Improved safety

Deadfront construction provides a higher level of safety for operating personnel. The optional visible-break switch with viewing window verifies an open circuit without removing the cables. Large, easily viewed contacts show the open/close position of the visible-break switch.

Eliminates increasing government regulation compliance costs

Fire-resistant E200 fluid and FR3 fluid are offered as insulation media options. E200 fluid is fire-resistant biodegradable, polyol ester-based, non-toxic low viscosity fluid with excellent dielectric, thermal and physical properties. The low viscosity characteristic allows it to be used in VFI switchgear down to -30 °C. Its fire point is greater than 300 °C (572 °F), a requirement for less flammable fluids, allowing the equipment to meet or exceed UL listing requirements. FR3 fluid does not contain any petroleum, halogens or silicones. It quickly and thoroughly biodegrades in both soil and aquatic environments. The fluid tested non-toxic in aquatic toxicity tests.
Specifications

Ratings

    15 kV 15 kV 25 kV 35 kV
Maximum design voltage, kV 15.5 15.5 27.0 38.0
BIL, kV 95 95 125 150
1-minute withstand voltage (60 Hz), kV 35 35 60 70
Momentary current, 10 cycles (sym.), kA 12.5 16.0 12.5 12.5
1-second withstand current (sym.), kA 12.5 16.0 12.5 12.5
Vacuum fault interrupter Continuous current, (max.), A 600** 600 600** 600
Interrupting current (sym./asym.), kA 12.5/20.0 16/25.8 12.5/20.0 12.5/20.0
Making current (sym.), kA 12.5 16.0 12.5 12.5
Cable charging interrupting current, A 10.0 10.0 25.0 40.0
Load-break switch Continuous current, (max), A 600 600 600 600
Load switching, A 600 600 600 600
Fault making (sym./asym.), kA 12.5/20.0 16/25.8 12.5/20.0 12.5/20
* Continuous and short-circuit currents may be limited by ratings of selected bushings
** 900 A and 1200 A continuous-current ratings are also available

Standard features

  • Liquid level or pressure gauge
  • Lift-up roof with retainers
  • Side recessed lifting provisions
  • Pentahead bolt with padlock provisions
  • 200 A bushing wells or 600 A bushings
  • Accessory parking stands
  • Drain plug
  • Tri-phase control
  • Single, double side, compact

Optional features and benefits

  • Deadfront construction improves operator safety
  • Available in up to six-way units – makes it ideal for large installations with multiple loads such as large complexes
  • Idea or SEL relays allow for enhanced protection and communications
  • Single- or three-phase tripping for commercial or residential applications
  • Visible break with ground allows grounding without disconnecting cables
  • FR3 and E200 insulation eliminates environmental compliance costs
  • Optional solid copper grounding rod makes grounding simple and convenient
  • Resettable VFI allows immediate service restoration

Optional accessories

  • Ground rod or flat buss
  • Kirk key interlock provisions
  • Visible break with optional ground
  • Single-phase or three-phase trip
  • Operation counter
  • Fault indicator provisions
  • Auxiliary switch
  • Microprocessor-based Idea or SEL relays
  • Motor actuator

UL listing and labeling options

  • 15 kV and 25 kV voltage ratings
  • 600 A continuous current rating
  • 12.5 kA symmetrical interrupting rating
  • Fluid dielectrics (mineral oil, E200 and FR3 fluids)
  • Visible-break switch (two- and three-position)
  • Mild and stainless steel construction
  • Tri-phase and TPG control
  • All standard combinations of load switches and fault interrupters

Applicable standards

  • IEEE Std C37.74-2003 standard, Standard Requirements for Subsurface, Vault, and Pad-Mounted Load-Interrupter Switchgear and Fused Load-Interrupter Switchgear for Alternating Current Systems Up to 38 kV
  • IEEE Std C37.60-2003 standard, Standard Requirements for Overhead, Pad-Mounted, Dry Vault, and Submersible Automatic Circuit Reclosers and Fault Interrupters for Alternating Current Systems Up to 38 kV
  • IEEE Std C57.12.28-2005 standard, Standard for Pad-Mounted Equipment—Enclosure Integrity
  • IEEE Std C57.12.29-2005 standard, Standard for Pad-Mounted Equipment—Enclosure Integrity for Coastal Environments –applicable when stainless steel construction is specified
  • IEEE Std 386-2006 standard, Standard for Separable Insulated Connector Systems for Power Distribution Systems Above 600 V
  • IEEE Std C37.90-2005 standard, Standard for Relays and Relay Systems Associated with Electric Power Apparatus
  • IEEE Std C37.90.2-2004 standard, Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers
Download Links
  • iDP-210 feeder protection relay catalog
    This catalog describes ratings and ordering information for Eaton’s Cooper Power series Edison Idea iDP-210 full featured relay which is suitable for a variety of protection applications including feeder protection, reclosing, synch-check, frequency based load shedding, reverse power, overcurrent, over/under voltage and frequency.
    (PDF 1 MB , 28/08/2019)
  • iTAP-265 dual overcurrent relay catalog
    This catalog describes ratings and ordering information for Eaton’s Cooper Power series Edison Idea iTAP-265 full-featured relay which is suitable for overcurrent protection for two three-phase feeders in typical underground distribution switchgear applications.
    (PDF 427 KB , 01/04/2015)
  • VFI vacuum fault interrupter switchgear catalog
    This catalog describes ratings and ordering information for Eaton’s Cooper Power series VFI underground distribution switchgear which provides a simple, economical approach to protective requirements for 5, 15, 25 and 35 kV underground systems.
    (PDF 2 MB , 26/04/2021)
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