Download Protection from the harmful effects of arcing faults

5–15 kV arc-resistant switchgear
Protection from the harmful
effects of arcing faults
Arc-resistant metal-clad switchgear is built to resist the
effects of arcing faults occurring inside the switchgear
assembly. An arcing fault produces a variety of physical
phenomena, including sudden pressure increases and
extreme localized overheating, which combine to destroy
conductors, insulation, and enclosure parts. Internal
arcing faults result in severe mechanical and thermal
stresses on the switchgear assembly, and the materials
involved in the arcing fault may produce hot decomposition
products, either gaseous or particulate. A plenum
and exit duct vents direct this away from personnel
to a designated area.
Arc-resistant switchgear
making safety more
comfortable
The NECT calls for an arc flash
boundary of zero around
medium voltage switchgear
if it has been successfully
certified as arc-resistant
switchgear per IEEET C37.20.7.
With certified Type 2B arcresistant switchgear, arc flash
boundaries are eliminated even
when the control compartment
doors are open (for Eaton
switchgear, this includes the
control compartment door
in front of the circuit breaker).
Eaton offers a wide variety
of tested two-high switchgear
configurations and bus
transitions certified by ULT to
protect personnel from arcing
faults of up to 63,000A rms
for a duration of 0.5 seconds.
Type 2B ratings are available
for all arc-resistant configurations, reducing required
personal protective equipment
even with control doors open.
Fully tested system
configurations (layout
flexibility)
•
36-inch-wide vertical
structures
•
Two-high breaker
configurations
•
•
•
Two-high configurations
with auxiliary drawer,
fuse drawer, and circuit
breaker combinations
The ability to mount devices
on circuit breaker doors helps
to minimize equipment size
for two-high configurations
Ability to mount protective
relays, meters and other
controls on each of the
three compartment doors
allows for more compact
switchgear designs
•
Direct roll-in circuit breakers
available in both upper and
lower breaker compartments
•
Tested standard bus duct
connections available upon
request
•
Close coupling with medium
voltage MCCs, transformers
and other equipment tested
to IEEE C37.20.7
•
Metal-clad switchgear close
coupled to medium voltage
motor control sharing a single
arc exhaust plenum and
ducting system
Rugged arc-resistant
construction
•
Structure is built to withstand
the effects of internal faults up
to the maximum fault current
rating of the switchgear
•
Formed steel compartment
design provides sealed joints
under fault conditions
•
Includes extra-strength, multipoint latches and robust door
hinges to ensure that doors
remain intact and latched
during an arcing event
•
A welded heavy-duty
door design safely contains
the extreme forces of
an arcing fault
Integral safety features
•
Metal-clad construction
certified to IEEE C37.20.2
provides maximum circuit
separation and safety
•
Type 2B arc-resistant
construction allows for all
instrument compartment
doors to be opened without
sacrificing protection from a
potential internal arcing fault
•
Door interlocks ensure that
the breaker door remains
closed unless the breaker
is open and racked out
•
Through-the-door racking is
provided to rack circuit
breakers in or out without
opening the arc-resistant
circuit breaker door
Safety enhancement options
•
•
•
Optional universal power
racking device allows an
operator to rack a breaker
in from a distance
Optional integral remote
racking device allows racking
of circuit breaker without the
hassle of moving, connecting,
and storing a large device
Lifting pan available to lift
circuit breakers from below
Protection and metering
•
•
•
Eaton will incorporate any
manufacturer’s microprocessorbased protective relays,
including Eaton’s full line of
protective relays featuring
our patented Arc Reduction
Maintenance SystemE
Eaton will incorporate
any manufacturer’s meters,
including Eaton’s Power XpertT
power quality meter, which
detect sags, swells and
harmonics in addition to
comprehensive power
measurements and logging
Zone selective interlocking can
be supplied upon request
NNote: For comprehensive application
information switchgear controls,
please see Eaton’s Consulting
Application Guide (Section 5).
Ratings
•
Rated max voltage:
5 kV–15 kV
•
Maximum short-circuit rating:
Up to 63 kA (5/15 kV Class)
•
BIL rating: 60 kV for 5 kV
Class, 95 kV for 15 kV Class
•
Main bus ratings: 1200A,
2000A, 3000A, 4000A
•
40 kA arc-resistant ratings
are available for 27 kV and
38 kV class equipment with
continuous current ratings
up to 3000A
NNote: 4000A rating
requires fan cooling.
Many configurations are
available to create the perfect
system to meet your needs.
Refer to Eaton’s Consulting
Applications Guide for complete
details of available ratings and
layout dimensions.
Arc exhaust
plenum
Control
Compartment
Eaton’s arc-resistant
switchgear has been fully
tested in accordance with
ANSI C37.20.7 (Type 2B).
Auxiliary
(V T, CPT
or Fuses)
Control
Compartment
(no relays)
Dynamic Vent
Arc-resistant standards
Exhaust ducts can exit from front, side or rear. Two duct exits are
required for switchgear rated 50 kA and higher. Contact factory
with specific application questions.
1200A
Breaker
(with relay
box)
Control
Compartment
Auxiliary
(VT,CPT
or Fuses)
Auxiliary
(V T, CPT
or Fuses)
Blank or
Transistion
to Ampgard
(no relays)
Control
Compartment
Auxiliary
(VT,CPT
or Fuses)
(no relays)
(no relays)
2000/3000A
Breaker
(with relay
box)
3000A
Breaker
(with relay
box)
3000A FC
Breaker
(with relay
box)
Dynamic Vent
Dynamic Vent
Dynamic Vent
Control
Compartment
Control
Compartment
Control
Compartment
Blank or
Auxiliary
3000A FC
Breaker
(with relay
box)
4000A FC
Breaker
(with relay
box)
Metal-clad switchgear
standards
ANSI / IEEE C37.20.2
Seismic qualification
Seismic-qualified by actual
testing to meet requirements
of IBC 2006 and CBC 2007.
Fan
Control
Compartment
Auxiliary
(VT,CPT
or Fuses)
(no relays)
Control
Compartment
Fan
Dynamic Vent
Auxiliary
(VT, CPT
or Fuses)
Control
Compartment
Fans located
inside this
compartment
(no relays)
Dynamic Vent
Eaton Corporation
Electrical Sector
1111 Superior Ave.
Cleveland, OH 44114
United States
877-ETN-CARE (877-386-2273)
Eaton.com
© 2011 Eaton Corporation
All Rights Reserved
Printed in USA
Publication No. PA02200002E / Z10595
April 2011
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of Eaton Corporation.
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of their respective owners.