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Low Profile sealed construction

VFI switchgear features a low-profile cabinet design, with sealed

tank construction. This means that VFI switchgear can be used in

locations where air-insulated switchgear cannot, such as flood areas

or high-contaminant industrial sites. It is resistant to attacks from

dust, ice, vegetation, and wildlife.

Stainless steel

VFI switchgear may be specified in 100% stainless steel

construction for the ultimate in corrosion protection. With VFI

switchgear from Eaton’s Cooper Power Systems, the entire

unit is designed in stainless steel, including the tank and cable

compartments. All details and accessories are stainless steel

as well. This construction meets the requirements of IEEE Std

C57.12.29™-2005 standard, Standard for Pad-Mounted Equipment–

Enclosure Integrity for Coastal Environments.

Trip-free operation

The vacuum fault interrupter mechanism can be quickly and easily

reset manually by pulling the handle to the “reset” position and

then moving it to the closed position. However, if a fault is present

when the vacuum fault interrupter mechanism is closed, the trip-free

feature will prevent the mechanism from being held in the closed

position and it will clear the circuit fault.

Listed and Labeled

VFI switchgear and a number of its features can be UL® listed

and labeled to meet customer requirements as necessary. These

features are available for the family of VFI switchgear products as

follows:

•

15 kV and 25 kV voltage ratings

•

600 A continuous current rating

•

12.5 kA symmetrical interrupting rating

•

Fluid Dielectrics (mineral oil, E200 and Envirotemp™ 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

Low maintenance

Both load and fault interruption take place within the sealed vacuum

fault interrupter with no arcing by-products to contaminate the

insulating medium. Advanced technology vacuum fault interrupters

are reliable, have long life and require no maintenance. Eaton’s

Cooper Power Systems patented design reduces the arc energy—

resulting in far less contact erosion and the longest life of any

vacuum fault interrupter in the industry. Since there are no expulsion

fuses or switching by-products to contaminate the insulation

medium, maintenance intervals are greatly increased.

Edison™ Idea™ relay and Tri-Phase control

Eaton’s Cooper Power Systems Edison™ Idea™ relay and Tri-

Phase control makes use of internally mounted 1000:1 current

transformers (CT), one on each phase, to monitor line current. If

the current in any phase exceeds the minimum trip level setting,

the control begins a user selectable time-current-curve (TCC) delay

sequence.

At the completion of the programmed TCC delay, a signal is issued

to trip the vacuum fault interrupter mechanism.

CT circuits

The Tri-Phase control is self-powered by the line current. It requires

no external voltage supply or battery backup. Since the Tri-Phase

control is powered by the sensing CT circuits, it is not affected by

system voltage conditions.

Edison Idea relays require a 120 Vac power source to power their

internal battery source. The standard battery provided is an 13 Ah. 18

Ah batteries are an option.

Tri-Phase control settings

The minimum-trip setting for each phase is selectable. This permits

convenient field configuration of the Tri-Phase control, to meet

specific application requirements.

The control features an assortment of field replaceable TCC

modules, each provides a fixed time-current-curve characteristic. The

variety of modules available provides coordination flexibility between

the Tri-Phase control and other protective equipment.

Figure 5. TPG control with SCADA shown.

Figure 6. Tri-Phase control settings.

Tri-Phase Control Settings

Each phase minimum trip = Sum of

values in “ON” position plus 20A.

Example is shown as:

øA= 10 + 20 + 80 + 320 + 20 =

450A

øB = 320+20 = 340A

øC = 20A

Instantaneous Trip = Sum of values

“ON” position plus 1X.

Example is shown as:

2X + 8X + 1X = 11X

Each phase will exhibit

instantaneous

tripping at 11 times its trip setting

in this example.

øA

øB

øC

INST

TRIP

10A

20A

40A

80A

160A

320A

640A

10A

20A

40A

80A

160A

320A

640A

10A

20A

40A

80A

160A

320A

640A

OFF

Figure 7. Typical Tri-Phase with ground trip control (TPG)

module.

Technical Data 285-10

Effective April 2014

VFI underground distribution switchgear

www.cooperpower.com

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