Siemens GMI Series Owner's manual

SIEMENS
Instruction
Installation
Operation
Maintenance
5
kV
and
15
kV
Vacuum
Circuit
Breakers
Type
GMI
SG
-
3268
-
02
-
o
3
/
o
-
/
Z
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A
DANGER
h
Hazardous
voltages
.
Will
cause
death
,
serious
personal
injury
or
equipment
damage
.
Always
de
-
energize
and
ground
the
equipment
before
maintenance
.
Maintenance
should be
performed
only
by
qualified
personnel
.
The
use
of
unauthorized
parts
in
the
repair
of
the
equipment
or
tampering by
unqualified
personnel
will
result
in
dangerous
conditions which
will
cause severe
personal
injury
or
equipment
damage
.
Follow all
safety
instructions contained herein
.
IMPORTANT
The
information
contained
herein
is
general
in
nature
and
not
intended
for
specific
application
purposes
.
It
does
not
relieve the
user
of
responsibility
to
use
sound
practices
in
application
,
installation
,
operation
,
and maintenance
of
the
equipment
purchased
.
Siemens
reserves
the
right
to
make
changes
in
the
specifications
shown herein
or
to
make
improvements
at
any
time without notice
or
obligations
.
Should
a
conflict
arise
between the
general
information
contained
in
this
publication
and the
contents
of
drawings
or
supplementary
material
or
both
,
the
latter shall take
precedence
.
QUALIFIED
PERSON
For the
purpose
of
this manual
a
qualified
person
is
one
who
is
familiar
with
the
installation
,
construction
or
operation
of
the
equipment
and the hazards involved
.
In
addition
,
this
person
has the
following
qualifications
:
(
a
)
is trained and authorized
to
de
-
energize
,
clear
,
ground
,
and
tag
circuits and
equipment
in
accordance
with
established
safety
practices
.
(
b
)
is
trained
in
the
proper
care
and
use
of
protective
equipment
such
as
rubber
gloves
,
hard hat
,
safety
glasses
or
face
shields
,
flash
clothing
,
etc
.
,
in
accordance
with
established
safety
practices
.
(
c
)
is trained
in
rendering
first
aid
.
SUMMARY
These
instructions
do
not
purport
to
cover
all
details
or
variations
in
equipment
,
nor
to
provide
for
every
possible
contingency
to
be
met
in
connection
with
installation
,
operation
,
or
maintenance
.
Should further information
be
desired
or
should
particular problems
arise which
are
not
covered
sufficiently
for
the
purchaser
'
s
purposes
,
the
matter
should be
referred
to
the local sales
office
,
listed
on
back
of
this instruction
guide
.
The
contents
of
this instruction manual shall
not
become
part
of
or
modify
any
prior
or
existing
agreement
commitment
or
relationship
.
The sales
contract
contains the entire
obligation
of Siemens
Energy
&
Automation
,
Inc
.
The
warranty
contained
in
the
contract
between the
parties
is the sole
warranty
of
Siemens
Energy
&
Automation
,
Inc
.
Any
statements
contained
herein do
not create
new
warranties
or
modify
the
existing
warranty
.
i
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Table
of
Contents
Introduction and
Safety
Introduction
Qualified
Person
Signal
Words
Dangerous
Procedures
Field
Service
Operation
Receiving
,
Handling
and
Storage
Introduction
Receiving
Procedure
Shipping
Damage
Claims
Handling
Procedure
Storage
Procedure
Indoor
Storage
Outdoor
Storage
Space
Heating
Installation
Checks
and Initial Functional
Tests
Introduction
Inspections
,
Checks
and Tests without
Control
Power
De
-
Energizing
Control
Power
Spring
Discharge
Check
Removal
from
Lower
Cell
Removal
from
Upper
Cell
Removal
in
Outdoor
Non
-
Walk
in
Enclosures
Physical
Inspections
Manual
Spring Charging
Check
As
-
Found and Vacuum
Check
Tests
Automatic
Spring Charging
Check
Final Mechanical
Inspect
'
ons
without
Control
Power
Interrupter
/
Operator
Description
Introduction
Vacuum
Interrupters
and
Primary
Disconnects
Primary
Disconnects
Phase Barriers
Stored
Energy
Operating
Mechanism
Modes
of
Operation
-
Mid
-
1991
and
After
Modes
of
Operation
-
Discussion
Spring Charging
Mode
Closing
Mode
Trip
Free
Mode
Opening
Mode
Rapid
Auto
-
Reclosing
Mode
Modes
of
Operation
-
Up
to
Mid
-
1991
Modes
of
Operation
-
Discussion
Spring Charging
Mode
Closing
Mode
Trip
Free Mode
Opening
Mode
Rapid
Auto
-
Reclosing
Mode
Closing
and
Opening
Springs
Trip
Free
Operation
Damper
Manual
Spring
Charging
Spring Charging
Motor
Close Solenoid
,
Trip
Solenoid
and
Anti
-
Pump
Relay
Secondary
Disconnect
Auxiliary
Switch
MOC
(
Mechanism
Operated
Cell
}
Switch
TOC
(
Truck
Operated
Cell
)
Switch
Limit
Switches
Standard Schematic
Diagrams
Capacitor
Trip
Device
2
Undervoltage
Release
Interlocks
Trip
Free
Interlock
Rating
Interlock
Circuit
Breaker Frame
Ground
Disconnect
Circuit
Breaker
Handling
Wheels
Racking
Mechanism
Maintenance
Introduction and Maintenance Intervals
Recommended Hand Tools
Recommended Maintenance and Lubrication
Removal
from
Switchgear
Checks
of
the
Primary
Power Path
Cleanliness
Check
Inspection
of
Primary
Disconnects
Checks
of
the
Stored
Energy
Operator
Mechanism
Maintenance
and
Lubrication
Fastener
Check
Manual
Spring Charging
and
Contact
Erosion
Checks
Damper
Assembly
Check
Electrical
Control
Checks
Check
of
the
Wiring
and
Terminals
Check
of
the
Secondary
Disconnect
Automatic
Spring Charging
Check
Electrical
Close
and
Trip
Check
Checks
of
the
Spring Charging
Motor
High
-
Potential Tests
Vacuum
Integrity
Check
High
Potential Test
Voltages
Vacuum
Integrity
Test Procedure
As
-
Found Insulation and
Contact
Resistance
Tests
Insulation
and
Contact
Resistance Test
Equipment
Insulation
and
Contact
Resistance Test Procedure
Inspection
and
Cleaning
of
Breaker Insulation
Functional Tests
Overhaul
Introduction
Circuit
Breaker
Overhaul
Replacement
at
Overhaul
Replacement
of
Closing
Springs
Replacement
of
Opening
Spring
Replacement
of
Closing
and
Tripping
Solenoids
Replacement
of
Anti
-
Pump
Relay
Replacement
of
the
Auxiliary
Switch
Replacement
of
Motor
Cut
-
Off
Switch
Replacement
of
Trip
Latch
Reset
Check Switch
Replacement
of LS
3
-
Mid
-
1991
and
After
Replacement
of
LS
3
-
Up
to
Mid
-
1991
Replacement
of
Spring
Dump
Switch
Replacement
of
Damper
Assembly
Replacement
of
Spring Charging
Motor
Replacement
of
Primary
Disconnect
Fingers
Replacement
of
Vacuum
Interrupters
Preparation
Vacuum
Tube
Removal
Vacuum
Tube
Replacement
Periodic
Maintenance
and Lubrication
Tasks
Troubleshooting
Appendix
19
2
19
2
20
2
20
2
20
2
20
20
3
3
20
21
-
26
3
3
21
3
21
3
21
3
21
22
3
3
22
4
-
7
22
4
23
4
23
23
4
4
23
4
24
5
24
6
24
6
24
6
24
6
25
6 25
7
25
8
-
20
25
25
8
8
25
9 25
9 25
25
9
10
26
10 26
27
-
35
10
27
11
27
11
27
11
11
27
27
12
28
12
12
28
12
28
13
28
28
13
28
13
29
14
14
30
30
14
30
14
15
30
15
31
31
15
31
16
32
16
36
16
37
17
39
17
17
1
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1
Introduction
and
Safety
Signal
Words
The
signal
words
"
Danger
"
,
"
Warning
"
and
"
Caution
"
used
in
this
manual
indicate
the
degree
of
hazard
that
may
be
encoun
-
tered
by
the
user
,
These
words
are
defined
as
:
Danger
-
Indicates
an
imminently
hazardous
situation
which
,
if
not
avoided
,
will
result
in
death
or
serious
injury
.
Warning
-
Indicates
a
potentially
hazardous
situation
which
,
if
not
avoided
,
could
result
in
death
or
serious
injury
.
Caution
-
Indicates
a
potentially
hazardous
situation
which
,
if
not
avoided
,
may
result
in
minor
or
moderate
injury
.
Introduction
The
GMI
family
of
vacuum
circuit
breakers
is
designed
to
meet
all
the
applicable
ANSI
,
NEMAand
IEEE
standards
.
Success
-
ful
application
and
operation
of
this
equipment
depends
as
much
upon
proper
installation
and
maintenance
by
the
user
as
it
does
upon
the
careful
design
and
fabrication
by
Siemens
.
The
purpose
of
this
Instruction
Manual
is
to
assist
the
user
in
developing
safe
and
efficient
procedures
for
the
installation
,
maintenance
and
use
of
the
equipment
.
Contact
the
nearest
Siemens
representative
if
any
additional
information
is
desired
.
Dangerous
Procedures
In
addition
to
other
procedures
described
in
this
manual
as
dangerous
,
user
personnel
must
adhere
to
the
following
.
1
.
Always
work
on
a
de
-
energized
breaker
.
Always
de
-
ener
-
gize
a
breaker
,
and
remove
it
from
the
metal
-
clad
switchgear
before
performing
any
tests
,
maintenance
or
repair
.
2
.
Always
perform
maintenance
on
the
breaker
after
the
spring
-
charged
mechanisms
are
discharged
(
except
for
test
of
the
charging
mechanisms
)
,
3
.
Always
let
an
interlock
device
or
safety
mechanism
perform
its
function
without
forcing
or
defeating
the
device
.
ADANGER
Power
circuit
breakers
operate
at
high
voltages
and
have
spring
-
loaded
mechanical
parts
which
operate
at
high
speed
.
When
operated
improperly
,
this
equipment
will
cause
death
,
personal
injury
and
property
damage
.
To
avoid
elecTical
shock
,
burns
and
entanglement
in
moving
pals
this
equipment
must
be
installed
,
operated
and
maintained
only
by
qualified
persons
thoroughly
familiar
with
the
equipment
,
instruction
manuals
and
drawings
h
Field
Service
Operation
Siemens
can
provide
competent
,
well
-
trained
Field
Service
Representatives
to
provide
technical
guidance
and
advisory
assistance
for
the
installation
,
overhaul
,
repair
and
mainte
-
nance
of
S
emens
equipment
,
processes
and
systems
.
Con
-
tact
regional
service
centers
,
sales
offices
or
the
factory
for
details
.
Qualified
Person
For
the
purpose
of
this
manua
and
product
labels
,
a
"
Qualified
Person
"
is
one
who
is
familiar
with
the
installation
,
construction
and
operation
of
this
equipment
,
and
the
hazards
involved
.
In
addition
,
this
person
has
the
following
qualifications
:
•
Training
and
authorization
to
energize
,
de
-
energize
,
clear
,
ground
and
tag
circuits
and
equipment
in
accordance
with
established
safety
practices
.
•
Training
in
the
proper
care
and
use
of
protective
equipment
such
as
rubber
gloves
,
hare
hat
,
safety
glasses
,
face
shields
,
flash
clothing
,
etc
.
,
in
accordance
with
established
safety
procedures
.
•
Training
in
rendering
first
aid
,
2
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Receiving
,
Handling
and
Storage
Introduction
Type
GMI
Vacuum
Interrupter
Circuit
Breakers
are
normally
installed
in
assembled
metal
-
clad
switchgear
,
and the
Switch
-
gear
Instruction Manual
(
SG
-
3258
)
contains
the
Receiving
,
Handling
and
Storage
instructions
for
assembled metal
-
clad
switchgear
This manual
covers
the
Receiving
,
Handling
and
Storage
instructions
for
Type
GMI
circuit breakers
shipped
separately
from
the
switchgear
.
This section
of
the
manual is
intended
to
help
the
user
identify
,
inspect
and
protect
the circuit breaker
prior
to
its installation
.
A
WARNING
Heavy
Weight
Can
cause
death
,
serious
injury
,
or
property
damage
.
Obtain
the services
of
a
qualified
rigger
prior
to
hoisting
the circuit breaker
to
assure
adequate
safety
margins
in
the
hoisting
equipment
and
procedures
to
avoid
damage
Type
GMI
circuit
breakers
weigh
between
385
to
575
pounds
(
175
to
261
kg
)
.
See
Table
A
-
4
,
Technical Data
in
Appendix
.
4
The
palleted
circuit breaker
can
also be moved
using
a
properly
rated
fork
-
lift
vehicle
.
The
pallets
are
designed
for
movement
by
a
standard
fork
-
lift
vehicle
.
Storage
Procedure
1
.
Whenever
possible
,
install
circuit breakers
in
their
assigned
switchgear
enclosures
for
storage
.
Follow instructions
con
-
tained
in
the
Switchgear
Instruction Manual
,
2
.
When the
breaker
will
be
placed
on
its
pallet
for
storage
,
be
sure
the unit is
securely
bolted
to
the
pallet
and covered
with
polyethylene
film
at
least
10
mils thick
.
Indoor
Storage
-
Whenever
possible
,
store
the
circuit
breaker
indoors
.
The
storage
environment
must
be clean
,
dry
and
free
of
such items
as
construction dust
,
corrosive
atmosphere
,
mechanical
abuse
and
rapid
temperature
variations
.
Outdoor
Storage
-
Outdoor
storage
is
not
recommended
.
When
no
other
option
is
available
,
the circuit
breaker
must
be
completely
covered and
protected
from
rain
,
snow
,
dirt and
all
other contaminants
.
Space
Heating
-
Space
heating
must
be used
for
both
indoor
and
outdoor
storage
to
prevent
condensation
and
corrosion
.
When
stored outdoors
,
between
150
to
200
watts
per
breaker
of
space
heating
is
recommended
.
If
the circuit
breakers
are
stored inside the
switchgear
enclosures
,
and the
switchgear
is
equipped
with
space
heaters
,
energize
the
space
heaters
.
Receiving
Procedure
Make
a
physical
inspection
of
the
shipping
container
before
removing
or
unpacking
the circuit breaker
.
Check for
shipment
damage
or
indications
of
rough handling by
the carrier
.
Check
each
item
against
the
manifest
to
identify
any
shortages
.
Accessories
such
as
the
manual
charging
lever
,
the
racking
crank and the
plug
jumper
are
shipped
separately
.
Shipping
Damage
Claims
(
When
Applicable
)
-
Follow
nor
-
mal
shipment
damage
procedures
,
which
should
include
:
1
.
Check for
visible
damage
upon
arrival
.
2
.
Visible
damage
must
be
noted
on
delivery
receipt
,
and
acknowledged
with
driver
'
s
signature
,
Notation
,
"
Possible
internal
damage
,
subject
to
inspection
"
must
be
on
delivery
receipt
.
3
.
Notify
Siemens Sales office
immediately
of
any
shipment
damage
.
4
.
Arrange
for
carrier
s
inspection
.
Do
not
move
the unit
from
its
unloading
point
.
Handling
Procedure
1
.
Carefully
remove
the
shipping
carton
from
the circuit breaker
.
Keep
the
shipping
pallet
for
later
use
if
the
breaker
is
to
be
stored
prior
to
its
installation
.
2
.
Inspect
for
concealed
damage
.
Notification
to
carrier
must
take
place
within
15
days
to
assure
prompt
resolution
of
claims
,
3
.
Each circuit breaker should be
appropriately
lifted
to
avoid
crushing
the
side
panels
of
the breaker
,
or
damaging
the
primary
disconnect
subassemblies
.
3
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Installation
Checks
and
Initial
Functional
Tests
Introduction
This
section
provides
a
description
of
the
inspections
,
checks
and
tests
to
be
performed
on
the
circuit
breaker
prior
to
operation
in
the
metal
-
clad
switchgear
.
ADANGER
h
Hazardous
voltages
and
high
-
speed
mechanical
parts
.
Will
cause
death
,
severe
personal
injury
,
or
property
damage
.
Read
instruction
manuals
,
observe
safety
instructions
and
use
qualified
personnel
.
Inspections
,
Checks
and
Tests
without
Control
Power
Vacuum
circuit
breakers
are
normally
shipped
with
their
pri
-
mary
contacts
open
and
their
springs
discharged
.
However
,
it
is
critical
to
f
/
rsfverify
the
discharged
condition
of
the
spring
-
loaded
mechanisms
after
de
-
energizing
control
power
.
De
-
Energizing
Control
Power
in
Switchgear
-
When
the
circuit
breaker
is
mounted
in
switchgear
,
open
the
control
power
disconnect
device
in
the
metal
-
clad
switchgear
cubicle
.
Figure
1
shows
the
location
of
this
disconnect
in
a
standard
GM
switchgear
assembly
.
The
control
power
disconnect
device
is
located
on
the
device
panel
above
the
lower
circuit
breaker
and
below
the
upper
circuit
breaker
.
Figure
1
shows
a
pullout
type
fuse
holder
.
Removal
of
the
fuse
holder
de
-
energizes
control
power
to
the
circuit
breaker
in
the
respective
switchgear
cell
.
In
some
switchgear
assemblies
,
a
molded
case
circuit
breaker
is
used
in
lieu
of
the
pull
out
type
fuse
holder
.
Opening
this
circuit
breaker
accomplishes
the
same
result
:
control
power
is
dis
-
connected
.
Spring
Discharge
Check
(
Figure
2
)
-
Perform
the
Spring
Discharge
Check
before
removing
the
circuit
breaker
from
the
pallet
or
removing
it
from
the
switchgear
.
The
spring
discharge
check
consists
of
simply
performing
the
following
tasks
in
the
order
given
.
This
check
assures
that
both
the
tripping
and
closing
springs
are
fully
discharged
.
1
.
Press
red
Trip
pushbutton
.
2
.
Press
black
Close
pushbutton
.
3
.
Again
press
red
Trip
pushbutton
.
4
.
Verify
Spring
Condition
Indicator
shows
DISCHARGED
.
5
.
Verify
Main
Contact
Status
Indicator
shows
OPEN
.
Removal
from
Lower
Cell
in
Indoor
(
if
not
on
raised
pad
)
and
Shelter
-
Clad
Outdoor
Switchgear
-
After
performing
the
Spring
Discharge
Check
(
with
control
power
de
-
energized
)
,
remove
the
circuit
breaker
from
its
switchgear
cubicle
.
1
.
Insert
the
racking
crank
on
the
racking
screw
on
the
front
of
the
breaker
cell
,
and
push
in
.
This
action
operates
the
racking
interlock
latch
.
Figure
3
shows
racking
of
a
circuit
breaker
in
the
upper
cell
-
the
process
is
similar
for
a
breaker
in
the
lower
cell
.
2
.
Rotate
the
racking
crank
counterclockwise
until
the
breaker
is
in
the
Disconnect
position
.
If
the
racking
crank
is
not
of
the
"
Captive
"
type
,
constant
inward
pressure
is
required
during
racking
to
maintain
engagement
with
the
racking
mecha
-
nism
.
3
.
Move
the
breaker
release
latch
to
the
left
and
pull
the
circuit
breaker
out
from
the
Disconnect
position
.
The
breaker
can
now
be
removed
from
cubicle
.
Figure
1
:
Control
Power
Disconnects
in
Switchgear
.
Figure
2
:
Front
Panel
of
GMI
Circuit
Breaker
.
4
Courtesy of NationalSwitchgear.com

Installation
Checks
and Initial
Functional Tests
The
procedure
for
removal
of
an
upper
circuit
breaker
is
:
1
.
Insert the
two
extension
rails into the
fixed
rails
.
Be
sure
the
extension rails
are
properly
secured
in
place
.
(
This
can
be
done
at
Step
4
if
preferred
.
)
2
.
Insert
the
racking
crank
on
the
racking
screw
on
the
front of
the
breaker
cell
,
and
push
in
.
This action
operates
the
racking
interlock
latch
.
Figure
3
shows
racking
of
a
circuit
breaker
in
the
upper
cell
.
3
.
Rotate the
racking
crank
counterclockwise
until the breaker
is
in
the
Disconnect
position
.
If
the
racking
crank is
not
of
the
"
Captive
"
type
,
constant
pressure
is
required
during racking
to
maintain
engagement
with
the
racking
mechanism
.
4
.
If
you
have
not
yet
installed the extension
rails
,
do
so now
.
Note that
some
difficulty
may
be
experienced
installing
the
extension rails
if
the circuit
breaker is
in
the
Disconnect
position
.
If
difficulty
is encountered
,
rack
the circuit breaker
to
the
Test
position
,
install
the extension
rails
,
and then rack
the circuit
breaker
to
the
Disconnect
position
.
4
.
The
circuit
breaker
is
now
free
to
be rolled
out
on
the
floor
using
the
handles
as
shown
in
Figure
4
.
The
wheels
of
the
circuit breaker
are
virtually
at
floor
level
(
unless the switch
-
gear
is installed
on a
raised
pad
)
,
and
one
person
can
easily
handle
the
unit
.
Removal
from
Upper
Cell
(
Indoor and
Shelter
-
Clad Out
-
door
Switchgear
)
-
Removal
of
the
upper
breaker
in
a
two
-
high
assembly
is
similar
to
removal
of
a
breaker
from
a
lower cell
,
with
several
additional
steps
.
Figure
5
shows
one
of
the
two
breaker extension rails
being
inserted into the
fixed
rails
within
the
upper
cell
of
two
-
high
switchgear
equipment
.
The rails
engage
locking
pins
in
the
fixed
rails
to
secure
them
in
position
.
AWARNING
Heavy
Weight
Can
cause
death
,
serious
injury
,
or
property
damage
.
Always
use
extension rails
to
remove or
install
circuit breaker
in
the
upper
cell
or
in
cells
not
installed
at
floor
level
.
5
.
Move the breaker
release
latch
to
the
left
and
pull
the
circuit
breaker
out
from
the Disconnect
position
.
The breaker is
now
free
to
be rolled
out
on
the
two
extension
rails
using
the
handles
on
the
front of
the
circuit
breaker
.
6
.
Remove the
breaker
from
the
two
extension
rails
using
the
approved
Siemens
breaker
lifting
device
.
7
.
Lift
the
two
extension rails and withdraw
them
from
the
switchgear
.
Figure
3
:
Racking
Circuit
Breaker
in
Switchgear
.
Figure
5
:
Use
of
Extension Rails
for
Upper
Compartment
.
Figure
4
:
Removal
of
Circuit
Breaker
.
5
Courtesy of NationalSwitchgear.com

Installation
Checks
and
Initial
Functional
Tests
As
-
Found
and
Vacuum
Check
Tests
-
Perform
and record
the
results
of
both
the
As
-
Found
insulation
test
and
the
vacuum
check
high
-
potential
test
.
Procedures
for
these
tests
are
described
in
the
Maintenance
Section
of
this
manual
.
Removal
from
Upper
and
Lower
Cell
in
Outdoor
Non
-
Walk
In
Enclosures
or
for
Indoor
Switchgear
Installed
on
a
Raised
Pad
-
Because the
floor
level
in
non
-
walk
in
outdoor
enclosures
is
approximately
6
inches above
grade
(
founda
-
tion
)
level
,
the
lower breaker
in
either
a one
-
high
or
two
-
high
section
of
switchgear
must
be
removed
using
the
preceding
procedure
for
upper
breaker
removal
.
The
approved
breaker
lifting
device should be used
for
re
-
moval
of
both lower and
upper
breakers
from
the extension
rails
of
outdoor
non
-
walk
in
enclosures
.
Physical
Inspections
1
.
Verify
that
rating
of
the circuit
breaker is
compatible
with
both
the
system
and the
switchgear
.
2
.
Perform
a
visual
shipping
damage
check
.
Clean
the breaker
of
all
shipping
dust
,
dirt
and
foreign
material
.
Manual
Spring Charging
Check
1
.
Insert the manual
spring charging
lever into
the manual
charge
handle
socket
as
shown
in
Figure
6
.
Operate
the
lever
up
and
down
until the
spring
condition indicator
shows
the
closing spring
is
Charged
.
2
.
Repeat
the
Spring
Discharge
Check
.
3
.
Verify
that
the
springs
are
discharged
and the
breaker
primary
contacts
are
open
by
indicator
positions
.
Automatic
Spring
Charging
Check
Note
:
A
temporary
source
of
control
power
and
test
leads
may
be
required
if
the
control
power
source
has
not
been
con
-
nected
to
the
switchgear
.
(
Refer
to
the
specific
wiring
informa
-
tion and
rating
label
for
your
circuit breaker
to
determine the
voltage
required
and
where the
control
voltage
signal
should
be
applied
.
Usually
,
spring
charging
power
is
connected
to
secondary
disconnect
fingers
SD
16
and
SD
15
,
closing
control
power
to
SD
13
and
SD
15
,
and
tripping
power
to
SD
1
and
SD
2
.
)
When
control
power
is
connected
to
the
GMI
circuit breaker
,
the
closing
springs
should
automatically
charge
.
The
automatic
spring
charging
features
of
the circuit
breaker
must
be
checked
.
Control
power
is
required
for
automatic
spring
charging
to
take
place
.
1
.
Open
control
power
circuit
by removing
pullout
fuse
holder
shown
in
Figure
1
,
2
.
Install
breaker end
of
split
plug
jumper
(
if
furnished
)
shown
in
Figure
7
to
the
circuit
breaker
.
The
plug
jumper
is
secured
by
means
of
screws
,
over
the circuit
breaker
'
s
secondary
contacts
.
A
CAUTIO
4
5
=
=
asns
»
21659
-
93
Figure
7
:
Split
Plug
Jumper
Connected
to
Circuit
Breaker
.
Figure
6
:
Manual
Charging
of
Closing Springs
.
6
Courtesy of NationalSwitchgear.com

Installation
Checks
and
Initial
Functional Tests
3
.
Install
the
switchgear
end
of
the
plug
jumper
shown
in
Figure
8
to
the
secondary
disconnect
block inside the
switchgear
cubicle
.
The
jumper
slides
into
place
.
The
plug
jumper
interconnects all control
power
and
signal
leads
(
e
.
g
.
,
remote
trip
and close
contacts
)
between the switch
-
gear
and
the
circuit breaker
.
4
.
Energize
(
close
)
the
control
power
circuit disconnect
(
Fig
-
ure
1
)
.
5
.
Use the
Close
and
Trip
controls
(
Figure
2
)
to
first
Close
and
then
Open
the
circuit breaker
contacts
.
Verify
contact
positions
visually by
observing
the
Open
/
Closed
indicator
on
the
circuit
breaker
.
6
.
De
-
energize
control
power
by
repeating
Step
1
.
Disconnect
the
plug jumper
from
the
switchgear
first
and
next
from
the
circuit breaker
.
7
.
Perform
the
Spring
Discharge
Check
again
.
Verify
that the
closing springs
are
discharged
and the
primary
contacts
of
the
GMI
circuit
breaker
are
open
.
Final
Mechanical
Inspections
without
Control
Power
1
.
Make
a
final
mechanical
inspection
of
the circuit breaker
.
Verify
that
the
contacts
are
in
the
Open
position
,
and
the
closing springs
are
Discharged
.
2
.
Check
the
upper
and
lower
primary
studs
and
contact
fingers
shown
in
Figure
9
.
Verify
mechanical
condition
of
finger
springs
and the
disconnect
studs
.
3
.
Coat
movable
primary
contact
fingers
(
Figure
9
)
and the
secondary
disconnect
contacts
(
Figure
9
and
22
)
with
a
light
film
of Siemens
Contact
Lubricant No
.
15
-
171
-
370
-
002
.
4
.
The
GMI
vacuum
circuit
breaker is
ready
for
installation
into
its
assigned
cubicle
of
the metal
-
clad
switchgear
.
Refer
to
removal
procedures
and
re
-
install the
circuit breaker
into
the
switchgear
.
5
.
Refer
to
the
Switchgear
Instruction Manual
for
functional
tests
of
an
installed circuit breaker
.
Figure
9
:
Rear
of
GMI
Breaker
with
Primary
Disconnects
.
Figure
8
:
Split
Plug
Jumper
Connected
to
Switchgear
.
7
Courtesy of NationalSwitchgear.com

Interrupter
/
Operator
Description
Vacuum
Interrupters
and
Primary
Disconnects
The
operating
principle
of
the
GMI
vacuum
interrupter
is
simple
.
Figure
11
is
a
cutaway
view
of
a
typical
vacuum
interrupter
.
The
entire
assembly
is
sealed
after
a
vacuum
is
established
.
The
interrupter
stationary
contact
is
connected
to
the
upper
disconnect
stud
of
the
circuit
breaker
.
The
inter
-
rupter
movable
contact
is
connected
to
the
lower
disconnect
stud
and
driving
mechanism
of
the
circuit
breaker
.
The
metal
bellows
assembly
provides
a
secure
seal
around
the
movable
contact
,
preventing
loss
of
vacuum
while
permitting
vertical
motion
of
the
movable
contact
.
Introduction
The
Type
GMI
vacuum
circuit
breaker
is
of
drawout
construc
-
tion
designed
for
use
in
medium
voltage
,
metal
-
clad
switch
-
gear
.
The
GMI
circuit
breaker
conforms
to
the
requirements
of
ANSI
standards
C
37.20
.
2
,
C
37.04
,
C
37.06
,
C
37.09
and
C
37.010
.
GMI
circuit
breakers
consist
of
three
vacuum
interrupters
,
a
stored
energy
operating
mechanism
,
necessary
electrical
controls
and
interlock
devices
,
disconnect
devices
to
connect
the
breaker
to
both
primary
and
control
power
and
an
operator
housing
.
On
some
circuit
breaker
ratings
insulating
barriers
are
located
between
the
vacuum
interrupters
or
along
the
sides
.
This
section
describes
the
operation
of
each
major
subassem
-
bly
as
an
aid
in
the
operation
,
installation
,
maintenance
and
repair
of
the
GMI
vacuum
circuit
breaker
.
FIXED
CONTACT
CURRENT
CONNECTION
7
7
g
'
A
7
g
CERAMIC
INSULATOR
g
'
4
7
/
7
g
A
7
%
'
A
A
g
A
l
A
A
7
ARC
CHAMBER
A
2
%
A
A
%
A
7
p
7
'
n
%
ARC
SHIELD
r
%
\
w
\\
rr
y
v
y
Vi
%
N
im
FIXED
CONTACT
m
%
MOVING
CONTACT
•
-
-
-
'
.
T
r
g
%
d
CERAMIC
INSULATOR
g
g
-
2
7
,
g
2
2
2
g
2
METAL
BELLOWS
g
i
_
r
7
,
g
g
a
?
GUIDE
—
MOVING
CONTACT
CURRENT
CONNECTION
mu
Figure
11
:
Cutaway
View
of
GMI
Vacuum
Interrupters
.
When
the
two
contacts
separate
an
arc
is
initiated
which
continues
conduction
up
to
the
following
current
zero
.
At
current
zero
,
the
arc
extinguishes
and
any
conductive
metal
vapor
which
has
been
created
by
and
supported
the
arc
condenses
on
the
contacts
and
on
the
surrounding
vapor
shield
.
Contact
materials
and
configuration
are
optimized
to
achieve
arc
motion
and
to
minimize
switching
disturbances
.
Figure
10
:
Front
View
of
GMI
Breaker
.
8
Courtesy of NationalSwitchgear.com