Siemens GMI Series

Maintenance
Inspection
and
Cleaning
of
Breaker
Insulation
1
.
Perform
the
Spring
Discharge
Check
on
the
circuit
breaker
,
after
all
control
power
is
removed
.
The
Spring
Discharge
Check
consists
of
1
)
depressing
the
red
Trip
pushbutton
,
2
)
then
depressing
the
black
Close
pushbutton
,
and
3
)
again
depressing
the
red
Trip
pushbutton
.
All
of
these
controls
are
on
the
breaker
front
panel
.
Visually
verify
the
Discharge
condition
of
the
springs
2
.
Remove
any
interphase
and
outer
phase
barriers
as
shown
in
Figure
13
3
.
Clean
barriers
and
post
insulators
using
clean
cloth
and
one
of
the
following
cleaning
solvents
:
•
No
.
1
or
No
.
2
denatured
alcohol
•
Isopropyl
or
isobutyl
alcohol
3
.
Apply
the
proper
AC
(
i
.
e
.
,
either
14
or
27
kV
)
or
DC
(
i
.
e
.
,
either
20
or
38
kV
)
high
potential
test
voltage
between
a
primary
conductor
of
the
pole
and
ground
for
one
minute
.
4
.
If
no
disruptive
discharge
occurs
,
the
insulation
system
is
satisfactory
.
5
.
After
test
,
ground
both
ends
and
the
middle
of
each
vacuum
bottle
to
dissipate
any
static
charge
.
6
.
Disconnect
the
leads
to
the
spring
charging
motor
.
7
.
Connect
all
points
of
the
secondary
disconnect
with
a
shorting
wire
.
Connect
the
shorting
wire
to
the
high
potential
lead
of
the
high
voltage
tester
,
and
ground
the
breaker
housing
.
Starting
with
zero
volts
,
gradually
increase
the
test
voltage
to
1500
volts
,
RMS
,
60
Hz
.
Maintain
test
voltage
for
one
minute
.
8
.
If
no
disruptive
discharge
occurs
,
the
secondary
control
insulation
level
is
satisfactory
.
9
.
Disconnect
the
shorting
wire
and
re
-
attach
the
leads
to
the
spring
charging
motor
.
10
.
Perform
contact
resistance
tests
of
the
primary
contacts
using
a
ductor
.
Contact
resistance
should
not
exceed
the
values
listed
in
Table
4
.
Table
4
Maximum
Contact
Resistance
4
.
Replace
all
barriers
.
Check
all
visible
fasteners
again
for
condition
and
tightness
.
Note
:
Do
not
use
any
cleaning
compounds
containing
chlorinated
hydrocarbons
such
as
trichlorethylene
,
perchlorethylene
or
carbon
tetrachloride
.
These
compounds
will
damage
the
phenlylene
ether
coplymer
material
used
in
the
barriers
and
other
insulation
on
the
circuit
breaker
.
Contact
Resistance
(
Micro
-
Ohms
)
Current
Rating
(
Amps
)
60
1200
40
2000
Functional
Tests
Refer
to
the
Installation
Checklist
in
the
Installation
Checks
and
Initial
Functional
Tests
section
of
this
manual
Functional
tests
consist
of
performing
at
least
three
(
3
)
Manual
Spring
Charging
Checks
and
three
(
3
)
Automatic
Spring
Charging
Checks
.
After
these
tests
are
complete
,
and
the
springs
fully
dis
-
charged
,
all
fasteners
and
connections
are
checked
again
for
tightness
and
condition
before
re
-
installing
the
breaker
into
the
metal
-
clad
switchgear
.
20
3000
11
.
Make
a
permanent
record
of
all
tests
performed
.
26
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