Siemens GMI Series

Maintenance
Note
:
A
temporary
source
of
control
power
and
test
leads
may
be
required
if
the
control
power
source
has
not
been
connected
to
the
switchgear
.
When
control
power
is
connected
to
the
GMI
circuit
breaker
,
the
closing
springs
should
automatically
charge
.
Electrical
Close
and
Trip
Check
—
Control
Power
Required
-
A
check
of
the
breaker
control
circuits
is
performed
while
the
unit
is
still
connected
to
the
switchgear
by
the
plug
jumper
,
This
check
is
made
with
the
breaker
energized
by
control
power
from
the
switchgear
.
1
.
Once
the
breaker
springs
are
charged
,
move
the
switchgear
Close
/
Trip
switch
to
the
Close
position
.
There
should
be
both
the
sound
of
the
breaker
closing
and
indication
that
the
breaker
contacts
are
closed
by
the
main
contact
status
indicator
.
2
.
As
soon
as
the
breaker
has
closed
,
the
automatic
spring
charging
process
is
repeated
.
3
.
After
a
satisfactory
close
operation
is
verified
,
move
the
switchgear
Close
/
Trip
switch
to
the
Trip
position
.
Verify
by
both
sound
and
contact
position
that
the
contacts
are
open
.
Completion
of
these
checks
demonstrates
satisfactory
op
-
eration
of
auxiliary
switches
,
internal
relays
and
solenoids
.
Checks
of
the
Spring
Charging
Motor
-
No
additional
checks
of
the
spring
charging
motor
are
necessary
.
Once
every
10
,
000
operations
,
the
motor
brushes
need
replacement
(
ref
-
erence
kit
18
-
658
-
612
-
886
)
.
Use
tne
operation
counter
as
the
basis
for
establishing
the
operation
frequency
.
High
Potential
Test
Voltages
-
The
voltages
for
high
potential
tests
are
shown
in
Table
3
.
Table
3
High
Potential
Test
Voltages
Equipment
kV
Rating
Max
AC
RMS
Max
DC
Avg
4.76
kV
8.25
kV
15.0
kv
14
kV
20
kV
38
kV
27
kV
27
kV
38
kV
Note
:
Do
not
use
DC
high
potential
testers
incorporating
half
-
wave
rectification
.
These
devices
produce
high
peak
voltages
.
These
high
voltages
w
II
produceX
-
ray
radiation
These
devices
also
show
erroneous
readings
of
leakage
current
when
testing
vacuum
circuit
breakers
.
Vacuum
Integrity
Test
Procedure
1
.
Observe
safety
precautions
listed
in
the
danger
and
caution
advisories
.
Construct
the
proper
barrier
and
warning
light
system
.
2
.
Ground
each
pole
not
under
test
.
3
.
Apply
test
voltage
across
each
pole
for
one
minute
.
4
.
If
the
pole
sustains
the
test
voltage
for
that
period
,
its
vacuum
integrity
has
been
verified
.
Note
:
This
test
includes
not
only
the
vacuum
interrupter
,
but
also
the
other
insulation
components
in
parallel
with
the
inter
-
rupter
.
These
include
the
standoff
insulators
and
the
insulated
drive
links
,
as
well
as
the
insulating
(
tension
)
struts
between
the
upper
and
lower
vacuum
interrupter
supports
.
If
these
insula
-
tion
components
are
contaminated
or
defective
,
the
test
volt
-
age
will
not
be
sustained
.
If
so
,
clean
or
replace
the
affected
components
,
and
retest
.
As
-
Found
Insulation
and
Contact
Resistance
Tests
-
As
-
Found
tests
verify
the
integrity
of
the
breaker
insulation
system
.
Megger
cr
insulation
resistance
tests
conducted
on
equipment
prior
to
installation
provide
a
basis
of
future
comparison
to
detect
changes
n
the
protection
afforded
by
the
insulation
system
.
A
permanent
record
of
periodic
As
-
Found
tests
enables
the
Main
-
tenance
organization
to
determine
when
corrective
actions
are
required
by
watching
for
significant
deterioration
in
insulation
resistance
,
or
increases
in
contact
resistance
.
Insulation
and
Contact
Resistance
Test
Equipment
-
In
addition
to
the
High
Potential
Test
Equipment
capable
of
test
voltages
as
listed
in
Table
3
,
the
following
equipment
is
also
required
:
•
AC
High
Potential
tester
with
test
voltage
of
1500
volts
,
60
Hz
.
•
Ductor
for
contact
resistance
tests
.
Insulation
and
Contact
Resistance
Test
Procedure
1
Observe
safety
precaution
listed
in
the
danger
and
caution
advisories
for
the
Vacuum
Integrity
Check
tests
2
.
Close
the
circuit
breaker
.
Ground
each
pole
not
under
test
.
Use
manual
cnarging
,
dosing
and
tripping
procedures
.
High
-
Potential
Tests
The
next
series
of
tests
(
Vacuum
Integrity
Test
and
Insulation
Tests
)
involve
use
of
hign
voltage
test
equipment
.
The
breaker
under
test
should
be
inside
a
suitable
test
barrier
equipped
with
warning
lights
.
Vacuum
Integrity
Check
-
A
high
potential
test
is
used
to
verify
the
vacuum
integrity
of
the
circuit
breaker
.
This
test
is
con
-
ducted
on
the
circuit
breaker
with
its
primary
contacts
in
the
Open
position
.
ADANGER
High
Potential
tests
employ
hazardous
voltages
.
Will
cause
severe
personal
injury
and
death
.
Follow
safe
procedures
,
exclude
unnecessary
personnel
and
use
safety
barriers
.
Keep
away
from
the
breaker
during
application
of
test
voltages
Disconnect
the
plug
jumper
from
between
the
circuit
breaker
and
switchgear
before
conducting
high
potential
tests
After
test
completion
,
ground
both
ends
and
the
middle
portion
of
the
vacuum
interrupter
to
dissipate
any
static
charges
.
h
it
WARNING
Vacu
um
i
nterrupters
may
emit
X
-
ray
radiation
.
Can
cause
personal
injury
.
X
-
rays
can
be
produced
when
a
high
voltage
is
placed
across
two
circuit
elements
in
a
vacuum
.
Keep
personnel
more
than
six
(
6
)
feet
away
from
a
circuit
breaker
under
test
.
25
Courtesy of NationalSwitchgear.com