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Features and detailed description

VFI switchgear

Eaton’s Cooper Power Systems VFI underground distribution

switchgear provides a simple, economical approach to protective

requirements for 5, 15, 25, and 35 kV underground systems.

The deadfront construction of VFI switchgear improves safety for

utility personnel and the general public. Inside, all terminations are

covered with insulating rubber that is grounded. All internal parts are

completely sealed in a steel tank to reduce maintenance and elimi-

nate the problems of moisture, dirt, and wildlife.

This fluid-insulated, sealed design offers an added advantage: an

unobtrusive, low-profile appearance.

VFI switchgear is versatile in its application. It is suited for

commercial/industrial and utility requirements.

Single-sided compact style VFI switchgear units are ideal for areas

where access is limited; such as next to a transformer, behind

a building, against a wall, or in a vault. The VFI vault-style unit is

suitable for indoor applications including commercial and industrial

electrical equipment rooms. 5- and 6-way units are ideal for large

retail complexes and campuses (military, university, industrial park)

with multiple loads.

For sustained reliability, Eaton’s Cooper Power Systems VFI

switchgear has 30 years of excellent field performance. The VFI

switchgear’s interrupting duty cycle is unmatched in the industry,

providing a full 232 interruptions per IEEE Std C37.60™-2003

standard (see Table 2).

Tri-Phase control

The Tri-Phase electronic control provides a flexible solution for time-

current-curve coordination. The Tri-Phase control offers over 100

minimum trip settings and an assortment of time-current curves.

With standard instantaneous trip and optional ground trip and

minimum response characteristics, the Tri-Phase control will satisfy

system protection and coordination needs. A wide selection of TCCs

and minimum trip settings make it easily adaptable to distribution

systems.

Figure 1. Compact single-sided units are available in vault and

pad-mounted styles.

Figure 2. VFI switchgear 6-way unit.

Table 1. Ratings for VFI Switchgear and Load-Break Switch*

Nominal Voltage 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 12.5/20.0

* Continuous and short-circuit currents may be limited by ratings of selected bushings.

** 900 A and 1200 A continuous-current ratings are also available.

Technical Data 285-10

Effective April 2014

VFI underground distribution switchgear

www.cooperpower.com

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