MV Switchgear
Metal Clad, Metal Enclosed, MCC, GIS
Presented by: Sherry Rollins
Nashville, TN
Confidential Property of Schneider Electric
The Fundamentals
Current rating above 1200A up to 3000A
continuous
 Capable of interrupting fault currents
•Interrupting capacities from 25kA - 63kA
Frequent Switching (up to 10,000
mechanical operations)
Speed of Operation (3 cycles), Limits Fault
Damage, I2T
Apply Protective Relay Schemes
w/unlimited combinations
Re-usable interrupters
Multi-shot Reclosing Capability
Increased Safety
Ease of Maintenance
Confidential Property of Schneider Electric
Common Applications
Utilities
Power
Plants, T&D
>
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Industry
Paper Mills, Steel and
Chemical Plants
Water
Pumping Stations,
Treatment Plants
Hospitals
Critical Loads
Datacenters
Critical Loads
Service entrance equipment
Applications requiring frequent switching
Redundancy - Automatic transfer schemes
Primary disconnect for:
- Substations - MV-MCC’s - Metal Enclosed Lineups - Motor Feeds
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VR Circuit Breaker
The VR is completely tested
and certified to all applicable
ANSI circuit breaker
standards and is UL Listed
Open/Close
Pushbuttons
Rating Nameplate
Rail Rollers (Both Sides)
Manual Charging Handle Permanently Mounted On
The Type RI Operating
Mechanism
Spring Charged
Indicator
Status Indicator
VR Circuit Breaker
MOC Linkage
TOC Roller
Opening &
Closing Springs
Anti-pump Relay
Auxiliary Switch
Drive Bar &
Crossbar
Floor Wheels
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VR Circuit Breaker
With Front Cover
Removed
Operating
Mechanism - RI
Open/Close
Pushbuttons
Operations
Counter
Open-closed &
Spring Charge
Indicators
VR Circuit Breaker
Primary
Disconnect
Fingers
Pole
Assembly
Breaker
Runbacks
Secondary
Disconnect
Vacuum
Interrupter
VR Circuit
Breaker Rear
View
Erosion Gap
(E-gap)
Code Plate
Location
VR Circuit Breaker - Operation
Stationary Terminal
Condensing Shield
Stationary Contact
Movable Contact
Ceramic Envelope
Vacuum Dielectric
Moving Terminal
Metallic Bellows
VR Breaker – Vacuum Interrupter
Confidential Property of Schneider Electric
> Voltage Classes (7200V)
– 2400 V to 6900 V
> Motor Ranges:
– 75 kW (100 hp) to 6,938 kW (9300 hp)
> Motor Types:
– Induction
– Synchronous (TAG)
> Enclosure Types
Confidential Property of Schneider Electric
– Type 1, 1A, 3R
– Arc Resistant Type 2 or 2B
Controller
Applications
Types
> Blower
●Full Voltage - induction
>
Compressor
● FVNR
(Full Voltage Non-Reversing)
>
Pump
● FVNR
(Full Voltage Non-Reversing Latched)
● FVR
(Full Voltage Reversing)
>
Chiller
● Two
>
FanSpeed Two Winding
● Two Speed One Winding
> Transformer Feeder
●Reduced Voltage
> Chipper
● Auto-transformer (RVAT) (Reduced Voltage Auto Transformer)
>
Conveyor
● Soft
Start (RVSS) (Reduced Voltage Soft Start)
>
Capacitor
Bank
● Sequential
Smart
Start (S3)
Confidential Property of Schneider Electric
Metal Enclosed Switchgear
HVL, HVL/cc and Model III
Presented by: Sherry Rollins
Nashville, TN
Confidential Property of Schneider Electric
Metal-Enclosed Switchgear
HVL
Confidential Property of Schneider Electric
HVL/cc
Model III Unit
Substations
Confidential Property of Schneider Electric
Model III - Ratings & Options
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Primary Voltages: 2.4kV – 13.8kV
Ratings of 75-1,000 kVA at 480V
Ratings of 75-500 kVA at 240V
Branch circuit breakers from 15 - 1200A
80, 115, 150C transformer temperature rise
Available options:
–
–
–
–
–
–
–
–
Fuselogic
Surge arresters
Space heaters
Key interlocks
Aluminum or copper transformer windings
Fan cooling of transformer
Power meters (PM5000& 8000 series)
Grounding switch
Confidential Property of Schneider Electric
Model III Packaged
Unit Substation
Model III - Benefits
>
Combine primary switch, dry-type transformer, and I-Line
distribution into a single, compact unit
>
Efficient Performance – Meets with DOE required efficiency
>
Compact Design - Small size allows passing thru standard size
doorways and narrow hallways
>
Easy Expansion – Substations divide a system into isolated areas
>
Primary power is purchased from the utility at the lower primary
power rates, resulting in operational cost savings throughout the life
of the equipment
>
Overall installed cost is lower because of the cost benefits of
medium voltage distribution cable as compared to low voltage
cable or busway
>
Efficient Design - Can be installed against a wall or in a corner
without de-rating
Confidential Property of Schneider Electric
Model III - Dimensions
•
•
49.2” deep x 90” high
Transformer section width (B) is 48”
for 75-500 kVA and 60” for 500-1000
kVA
Primary
Cable Entry
A
B
Total Width
HVL/cc
Top
14.75
48
62.75
HVL/cc
Top
14.75
60
74.75
HVL/cc
Bottom
26
48
74
HVL/cc
Bottom
26
60
86
HVL
Top/Bottom
38
48
86
HVL
Top/Bottom
38
60
98
ATC
Top/Bottom
22
48
70
ATC
Top/Bottom
22
60
82
A
B
Typical Application
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–
–
–
–
–
Data Centers
Industrial Buildings
Healthcare Facilities
Educational Facilities
Hotels
High Rise Residential Buildings
Confidential Property of Schneider Electric
Metal-Enclosed Switchgear
> Why Metal-Enclosed Switchgear?
›
›
›
›
›
›
›
Current rating from 600-1200A continuous
Short time ratings from 25 -50kA without fuses
Limited Switching (150-1000 mech. operations)
3 phase interruption
Fused protection
Reduced system expense
Ease of Maintenance & reduced maintenance cost (vs. Metalclad)
Confidential Property of Schneider Electric
Metal-Enclosed Switchgear
> Common Applications
–
–
–
–
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Industrials
Commercial
Water Treatment Plants
Hospitals
Service Entrance Equipment
Sectionalizing feeder systems
Automatic Transfer Schemes
Used as Primary Disconnect for:
•
Unit Substations
•
MV MCC’ s
Confidential Property of Schneider Electric
Metal-Enclosed Switchgear
>Comparison of Metal-Clad and Metal-Enclosed
– Metal-clad has 10,000 operations, metal-enclosed has under 1000
– Metal-clad uses protective relays, metal-enclosed uses fuses for
protection
– Metal-clad uses drawout circuit breakers, metal-enclosed uses a fixed
switch or circuit interrupter
– Metal-clad is compartmentalized, metal-enclosed is a switch in a box
Confidential Property of Schneider Electric
Metal-Enclosed Switchgear
> Comparison of Metal-Clad and Metal-Enclosed (cont)
– Metal-clad has insulated bus, metal-enclosed std is uninsulated bus
– Metal-clad is always electrically operated, metal-enclosed std is
manually operated
– Metal-clad is a high speed switching device- 3cycles, metalenclosed fuses are from 10 msec to 600sec, (ref HVL Catalog 6040CT9201R12/94, pg 14)
– Metal-enclosed has a reduced footprint and can be front access only
Confidential Property of Schneider Electric
Metal Enclosed Switchgear
HVL/cb
Presented by: Sherry Rollins
Nashville, TN
Confidential Property of Schneider Electric
HVL/cb
Confidential Property of Schneider Electric
Confidential Property of Schneider Electric
Standard C37.20.3
>
IEEE Standard for Metal-Enclosed Interrupter Switchgear
(1 kV–38 kV)
> Description: Metal-enclosed interrupter (MEI) switchgear
assemblies containing, but not limited to, such devices as interrupter
switches; selector switches; power fuses; circuit breakers; control,
instrumentation and metering devices; and protective equipment are
included in this standard.
> It includes, but is not specifically limited to, equipment for the control
and protection of apparatus used for distribution of electrical power.
Confidential Property of Schneider Electric
Standard C37.20.7
> IEEE Guide for Testing Metal-Enclosed Switchgear Rated Up to 38
kV for Internal Arcing Faults
> Description: Revision of IEEE Std C37.20.7-2001. A procedure for
testing and evaluating the performance of metal-enclosed
switchgear for internal arcing faults is covered.
> A method of identifying the capabilities of this equipment is given.
> Service conditions, installation, and application of equipment are
also discussed.
Confidential Property of Schneider Electric
Standard C37.04, C37.06, C37.09

IEEE
Standard
forMetal
AC High-Voltage
Circuit
Rated
a Symmetrical

IEEEStandard
Std C37.04-1999
(R2006),
IEEE Breakers
Standard
Rating
Structure
for
IEEE
for
Enclosed
Switchgear
Rated 1kV
to on
52kV
Current
Basis Gas
-Preferred
Rating
and Related Required Capabilities for Voltages
AC HighVoltage
Circuit
Breakers
Incorporating
Insulation
Systems
Above 1000V
Description:
breakers
covered of
have
maximum
voltage
ratings
Description: Typical
Design,circuit
testing,
and installation
metal
enclosed
switchgear
that

IEEE
Standard
for
AC
High-Voltage
Circuit
Breakers
Rated
on
a
ranging
from gas
4.76
kV
through
800
current
ratings
of
1200A,
Description:
The(typically
preferred
ratings
of continuous
indoor
and
outdoor
high-voltage
incorporates
SF6)
at kV,
higher
than
ambient
pressure
as600A,
an circuit
Symmetrical
Current
Basis
-Preferred
Ratingindustrial,
and
Related
Required
2000A,
and
3000A
associated
w/ use
the various
maximum
voltage
ratings.
The rating
breakers
rated
above
1000
V for
in commercial,
and
insulation
medium
for
alternating-current
applications
above
1 kV
toutility
52 kV.
structure
establishes
the basis
forstandard.
all assigned
installations
are described
in this
Capabilities
for Voltages
Above
1000V ratings, including continuous current,
dielectric withstand voltages, short-circuit current, transient recovery voltage, and
capacitor switching, plus associated capabilities such as mechanical endurance,

IEEE
Standard
for Metal Enclosed
load
current,
and out-of-phase
switching. Switchgear Rated 1kV to 52kV
Incorporating Gas Insulation Systems
Confidential Property of Schneider Electric
HVL/cb Design
HVL/cb
Ratings
600, 800, 1200A, 25kA,
15.0kV, 95kV BIL
Enclosure
NEMA Type 1
Optional Type 2B Arc Res
90” height x 24” width x 65” depth
2286mm x 610mm x 1651mm
Components
Vacuum Circuit Breaker
Disconnector w/ SF6
Additional
Standards
Switchgear – Metal Enclosed
C37.20.3
Arc Res - C37.20.7
Confidential Property of Schneider Electric
Breaker – C37.04, C37.06,
C37.09
29
HVL/cb - Metal Enclosed VCB
Feeder Section – Side View
Main Bus
Switch
VT
Line CT (Qty -2 )
Breaker
Load CT (Qty -2 )
Outgoing Cables
Confidential Property of Schneider Electric
Low Voltage Compartment
Dimensions:
24” W x 20” H x 14” D
Confidential Property of Schneider Electric
Traditional MetalClad and Arc Res
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HVL/cb Arc Resistant
Plenum
Confidential Property of Schneider Electric
Evolis Vacuum Circuit Breaker
•Mechanism common with Masterpact LV
Breaker…more than 1 million units sold
•10,000 opérations mechanical endurance
•3 cycle interruption
Open
Button
CTs
Close
Button
Mechanism
Secondary
connection
Rear View
Front View
Evolis Breaker CT’s vs Traditional CT’s
Confidential Property of Schneider Electric
Voltage & Control Power Transformer
VTs:
Thermal Burden – 300VA
Accuracy – 0.3 WXY
Secondary – 120V
Low Partial Discharge PT to
meet IEC 60044-2
Removable Truck
(once primary cables are
disconnected, truck can be
removed using lift truck)
Confidential Property of Schneider Electric
5kVA CPT
(Optional)
Wye PTs
Fuses for PT
& CPT
Safety
> Interlocked Operation
– Sets sequence of operation for
maintenance personnel
– Only allows access to compartment in
de-energized and grounded state
Feeder
Current State – Breaker Closed, Disconnect
Closed. Switchgear Energized
Step 1 – Open Breaker
Step 2 – Open Disconnect
Step 3 – Ground Disconnect
Step 4 – Close Breaker
Step 5 – Allow User To Open The
Compartment Door
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> Integral Grounding
–
Allows for grounding of the main bus on
mains and cables on feeders
LV
> Compartmentalization
–
Integral Arc Plenum
Main Bus
Prevents access to unintended parts of
the switchgear
> Arc Resistant
– Optional Type 2B w/ Integral Plenum
Confidential Property of Schneider Electric
Breaker & Cable
Space Savings
> Front Accessibility
–
–
Allows for against the wall
installation
Eliminates the requirement of
NEC governed rear aisle space
> Small Footprint
–
>
Reduces square footage
necessary for installation
4 FT @ 5kV
5 FT @ 15kV
HVL/cb
65”
Deep
92” Deep
24”
4 FT @ 5kV
Wide
5 FT @ 15kV
MasterClad
Single High Breaker
Architecture
–
Optimizes square footage use
> Connection to HVLcc
36” Wide
4 FT @ 5kV
5 FT @ 15kV
– 14.75” Feeders w/ HVL/cb
Confidential Property of Schneider Electric
(Calculation with 1 main with VT & CPT, 6 Feeders at 5kV)
Benefits
 Space Efficient/ Safety
•Reduced Capex and Opex
Lowest cost offer for a VCB w/ reduced
maintenance intervals
•Front and Rear Accessible Designs
Optional front and rear design available. This
allows flexibility in your application and the
customer varying needs.
Confidential Property of Schneider Electric
Why use SF6 technology?
● Disconnect is used as isolation device, hence the SF6 (sulfur
Hexafluoride) is an insulation medium only in this design (except for in
duplex transformer primary – where it can be used as load break
switch)
● Vacuum interrupter is used for nominal current & fault interruption.
● Disconnect is sealed for life - Over 1 million units of the disconnect
installed world wide. (Disconnect is used in world leader secondary
switchgear - SM6)
52
● Recover & Recycle - Since interruptions are not done in SF6 – the
gas does not change state hence can be recovered & recycled at end
of equipment life.
● Space Savings is Permanent - Shrink the footprint by 33% - 35% .
Confidential Property of Schneider Electric
Applications
Transformer Primary
Main-Tie-Main
Main-Feeder
HVL/cc Primary
Motorpact Primary
Target Markets
• Federal/ Education
• Buildings
• Healthcare
• Oil & Gas
• Data Center
• Industry
• Water/ Waste Water
Confidential Property of Schneider Electric
Questions?
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THANK YOU.
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