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Edison™ Idea™ relays

Edison™ Idea™ relays allow enhanced functionality in protection and

communication.

The IDEA Workbench™ embedded within the ProView™ software

allow unsurpassed flexibility in customizing the relay protection and

control functions through downloadable Custom Software Modules.

Depending on the relay selected, Edison Idea relays can provide

protective functions such as overcurrent with or without ground

detection, over/under voltages, reverse power, and negative

sequence to name a few.

Advanced metering and analytics are also available which are critical

to providing Distribution Automation capability.

Single- or three-phase tripping

Most commercial loads consist of large three-phase transformers.

Many transformers are protected with single-phase fuses. Typically,

only one of the fuses will open during an overcurrent condition.

This “single-phases” three-phase commercial loads, and may cause

damage to three-phase motors and other equipment. VFI switchgear

solves this problem by providing three-phase ganged tripping. An

overcurrent on any phase automatically opens all three phases

simultaneously.

VFI switchgear can also be specified with single-phase trip, to

provide individual phase protection for single-phase residential

applications.

VFI switchgear can also serve as a vacuum loadbreak switch. Tap

switching has traditionally been accomplished by pulling loadbreak

elbows. With VFI switchgear, the tap can be switched with a simple

push-pull of the operating handle.

Vacuum loadbreak switch

Source switching is accomplished by three-phase, vacuum loadbreak

switches. The ratings for the vacuum switches are in Table 1.

Visible-break switch

Visible-break switches are available in two versions—a two-position

switch (closed/open) and a three-position switch, (closed/open/

ground). Visible-break is accomplished by a separate switch operated

from the side of the unit—away from the high voltage compartment.

This switch is mechanically interlocked such that the vacuum

load-break switch or the vacuum fault interrupter mechanism first

interrupts the current and then the visible-break switch may be

operated. The visible-break switch is rated 600 A continuous current

and has a making current rating up to 16 kA (sym). The ground

position allows the cables to be grounded without disconnecting or

moving the terminations. The switch contact positions are visible

via a large viewing window above the associated bushings. Only

VFI switchgear with liquid dielectric may be equipped with a visible-

break feature.

Types of insulation

Eaton’s Cooper Power Systems offers underground distribution

switchgear with the widest availability of dielectric media in the

industry. Fire-resistant E200 fluid and Envirotemp™ FR3™ fluid,

as well as commonly used mineral oil and SF

gas, are offered as

insulation media for VFI switchgear.

E200 fluid

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.

The performance of the switchgear equipment containing E200 fluid

is further enhanced by the fluid’s other important properties:

•

Excellent thermal properties

•

High dielectric strength

•

Oxidation stability

•

Clear bright appearance

Envirotemp™ FR3™ fluid

Envirotemp™ FR3™ fluid is formulated from edible vegetable oils

and food grade performance enhancing additives. It does not contain

any petroleum, halogens, silicones, or any other questionable

material. It quickly and thoroughly biodegrades in both soil and

aquatic environments. The fluid tested non-toxic in aquatic toxicity

tests.

Mineral oil

Mineral oil is a petroleum-based, time-proven insulation and has

reliable electrical insulating properties.

is non-flammable, odorless, colorless gas that requires a gas-

tight design and gas monitoring and handling systems.

Table 2. Interrupting Duty Cycle

Minimum Full Life Fault Interrupting Duty

Cycle per IEEE Std C37.60™-2003 standard (2

duty cycles) Number of Operations

Percent of

Interrupting

Current Rating:

15-20% 88

45-55% 112

90-100% 32

Total 232

Table 3. Available Dielectric Media–Minimum Application

Limits

E200 Fluid -30°C

Envirotemp™ FR3™ Fluid 0°C

Mineral Oil -30°C

Gas -30°C

IMPORTANT

For applications requiring SF

insulated switchgear, contact your

Eaton’s Cooper Power Systems representative when selecting

a relay/controller that has metering and protective elements

requiring potential transformers.

Technical Data 285-10

Effective April 2014

VFI underground distribution switchgear

www.cooperpower.com

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