Siemens 5-GMI-350 - Page 26

Maintenance
&
Overhaul
Page
23
Inspect
the
contact
fingers
for
any
evidence
of
burning
or
pitting
that
would
indicate
weakness
of
the
contact
finger
springs
.
Inspect
the
primary
disconnect
arms
for
physical integrity
and
absence
of
mechanical
damage
.
primary
disconnect
arms
for
tightness
and
absence
of
mechanical
damage
.
liailtiBliflf
:
:
“
IliSSlii
m
Hi
gpfBgfil
MM
;
"
w
It
:
M
.
Figure
43
.
Primary
Contact
Fingers
.
Checks
of
the
Stored
Energy
Operator
Mechanism
The
stored
energy
operator
checks
are
divided
into
mechanical and electrical
checks
for
simplicity
and
better
organization
.
This
first
series
of
checks
determine
if
the basic
mechanism is clean
,
lubricated
and
operates
smoothly
without control
power
.
The
contact
erosion
check
of
the
vacuum
interrupter
is
also
performed
during
these tasks
.
Cleaning
and
Lubrication
Table
2
.
Lubrication
Schedule
—
ANSI C
37.06
Table
8
.
Usual
Service
Conditions
.
Maintenance Based
Upon
Number
of
Breaker
Closing
Operations
Figure
41
.
View
of
Breaker
Showing
Vacuum
Interrupters
and
Primary
Disconnects
.
Number
of
Closing
Operations
Breaker
Type
5
-
G
MI
-
350
15
-
GMI
-
1000
1
,
000
All
others
2
,
000
Figure
42
.
Primary
Disconnect
in
Mated Position
.
The
interrupter
operator
mechanism
is
shown
in
Figure
44
with
the
front
cover
and the
operator
control
panel
removed
to
show
construction
details
.
Both
the
tripping spring
and
the
two
closing springs
are
shown
.
The
movable
end
of
each
closing
spring
is
connected
to
a
crank
arm
.
The
movable
Inspect
the
flexible
connectors
that
connect
the
bottom
movable
contacts
of
the
vacuum
interrupters
to
the lower
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