GE POWER/VAC GEK 86132A User manual

GEK
8.6
-
132
B
SUPERSEDES
GEK
86
!
!
32
A
INSTRUCTIONS
POWER
/
VAC
*
VACUUM
CIRCUIT
BREAKER
WITH
ML
-
18
MECHANISM
v
-
Courtesy of NationalSwitchgear.com

«
...
y
CONTENTS
Page
No
.
1
1
.
INTRODUCTION
1.1
.
Safety
.
.
.
1.1
.
1
,
General
1.1
.
2
.
Specific
2
.
DESCRIPTION
3
.
RECEIVING
,
HANDLING
AND
STORAGE
3.1
.
Receiving
.
.
3.2
.
Handling
3.3
.
Storage
. . ..
4
.
INSTALLATION
4.1
.
Safety
Precautions
4.2
.
Interlocks
4.2
.
1
.
Rating
Interference
Plate
4.2
.
2
.
Closing
Spring
Discharge
Interlock
4.2
.
3
.
Negative
Interlock
Roller
4.2
.
4
.
Positive
Interlock
Bar
4.2
.
5
.
Closing
Spring
Gag
Interlock
.
..
.
1
1
1
2
2
2
2
2
2
2
3
3
3
3
3
3
5
.
OPERATION
5.1
,
Close
Spring
Charging
5.2
.
Closing
Operation
5.3
,
Opening
Operation
5.4
.
Trip
Free
Operation
6
.
CONTROL
CIRCUIT
7
.
MECHANICAL
CHECKING
AND
SLOW
CLOSING
7.1
.
Visual
Inspection
7.2
.
Closing
Spring
Charging
,
, , ,
7.3
.
Closing
Spring
Gag
7.4
.
Slow
ClosiiVg
7.5
.
Gag
Plate
Removal
8
.
DIMENSIONAL
CHECKS
8.1
.
Primary
Contact
Erosion
8.2
.
Spring
Wipe
8.3
.
Contact
Gap
.
8.4
.
Close Coil
Plunger
Gap
8.5
.
Trip
Coil
Plunger
Gap
8.6
.
Control
Switch
Adjustment
3
4
»
*
4
4
5
5
5
i
*
5
5
5
5
5
6
6
6
6
6
6
6
>
7
Courtesy of NationalSwitchgear.com

9
.
ELECTRICAL
CHECKS
9.1
.
Electrical
Operation
9.2
.
High
-
Potential
Test
9.2
.
1
,
Primary
Circuit
9.2
.
2
.
Secondary
Circuit
9.3
.
Primary
Circuit
Resistance
.
.
..
.
.
9.4
.
Vacuum
Interrupter
Integrity
Test
9.5
.
Insulation
Tests
10
.
INTERLOCK
FUNCTIONAL
CHECK
11
.
MAINTENANCE
11.1
,
General
11.2
,
Service
Conditions
11.3
,
Fault
Interruptions
11.4
,
Contact
Erosion
11.5
,
Transfer
Finger
Wear
11.6
,
Mechanism
11.7
,
Primary
Insulation
Parts
11.8
,
Lubrication
11.9
,
Recommended
Maintenance
.
.
.
12
.
TIMING
13
.
OPENING
AND
CLOSING
SPEED
.
.
7
7
7
7
7
7
7
8
8
9
9
9
9
9
9
:
V
;
.
10
10
10
10
10
1 1
14
.
REPAIR
AND
REPLACEMENT
14.1
.
General
14.2
.
Replacement
of
Interrupter
Assemblies
14.3
.
Primary
Disconnect
Fingers
14.4
.
Mechanism
.
.
.
.
14.5
.
Control
Switches
11
1 1
1 1
12
12
.
.
A
12
<
4
44
4
4
•
I
4
4
4
4
<
4
4
•
4
44
«
4
4
4
4
»
44
4
44
4
»
44
»
4
4
»
4
*
4
4
4
»
44
4
4
4
»
44
4
>
4
4
44
4
«
4
*
14.6
.
Trip
Coil
Replacement
.
.
.
.
.
.
14.7
.
Closing
Coil
Replacement
..
.
,
14.8
.
Auxiliary
Switch
Replacement
14.9
.
Motor
Replacement
14
,
10
“
Y
”
12
.
vi
'
V
12
12
13
Rejay
Replacement
13
1
.
15
.
RENEWAL
PARTS
15.1
.
Ordering
Instructions
13
4
4
13
16
.
MECHANICAL
ADJUSTMENTS
16.1
.
General
16.2
.
Wipe
Adjustment
.
.
.
..
.
.
.
.
16.3
.
Contact
Gap
Adjustment
.
.
16.4
.
Trip
Coil
Plunger
16.5
.
Close
Coil
Plunger
16.6
.
Close
Latch
Stop
Bolt
.
.
.
.
.
16.7
.
Spring
Discharge
Interlock
.
16.8
.
Negative
Interlock
13
13
13
14
14
14
14
14
.
14
vv
Courtesy of NationalSwitchgear.com

LIST
OF
ILLUSTRATIONS
Page
No
.
FIGURE
1
RATING
INTERFERENCE
PLATE
FIGURE
2
FRONT
VIEW
OF
POWER
/
VAC
*
BREAKER
W
/
FRONT
COVER
.
FIGURE
3
FRONT
VIEW
OF
POWER
/
VAC
*
BREAKER
W
/
O
FRONT
COVER
FIGURE
4
MANUAL
CHARGING
.
FIGURE
5
MANUAL
CHARGING
FIGURE
6
TOGGLE
LINKAGE
POSITIONS
—
ML
-
18
MECHANISM
FIGURE
7
EROSION
INDICATOR
FIGURE
8
OPERATING
ROD
ASSEMBLY
FIGURE
9
SCHEMATIC
OF
ML
-
18
MECHANISM
FIGURE
10
TYPICAL
WIRING
DIAGRAM
FOR
ML
-
18
MECHANISM
FIGURE
11
POWER
/
VAC
*
BREAKER
LEFT
-
FRONT
VIEW
FIGURE
12
POWER
/
VAC
*
BREAKER
,
RIGHT
-
REAR
VIEW
FIGURE
13
TRIP
COIL
AND
LINKAGE
FIGURE
14
CLOSE
COIL
LINKAGE
FIGURE
15
BOTTOM
VIEW
OF
ML
-
18
MECHANISM
FIGURE
16
CONTACT
GAP
ADJUSTMENT
.
..
.
FIGURE
17
SPRING
DISCHARGE
INTERLOCK
FIGURE
18
SAMPLE
OPERATING
SPEED
GRAPHS
FIGURE
19
FLEX
CABLE
CONNECTION
FIGURE
20
NEGATIVE
INTERLOCK
FIGURE
C
CLOSE
COIL
PLUNGER
GAP
FIGURE
G
CONTACT
GAP
FIGURE
L
CLOSE
LATCH
STOP
FIGURE
S
CONTROL
SWITCHES
FIGURE
T
TRIP
COIL
PLUNGER
GAP
FIGURE
W
SPRING
WIPE
15
16
16
i
•
>
»
t
>
i
f
i
•
<
i
17
17
18
,
19
«
I
»
t
«
•
«
I
•
I
•
•
M
«
I
f
t
I
20
21
22
,
23
24
25
v
-
•
•
25
26
27
28
29
30
31
A
32
33
34
35
36
37
38
39
T
-
*
*
\
Courtesy of NationalSwitchgear.com

POWER
/
VAC
*
VACUUM
CIRCUIT
BREAKER
WITH
ML
-
I
8
MECHANISM
1
.
INTRODUCTION
1
1
,
1.2
.
SPECIFIC
DO
NOT
WORK
ON
AN
ENERGIZED
BREAKER
.
IF
WORK
HAS
TO
BE
PERFORMED
ON
THE
BREAKER
,
TAKE
IT
OUT
OF
SERVICE
AND
REMOVE
IT
FROM
THE
METALCLAD
EQUIPMENT
.
DO
NOT
WORK
ON
ANY
PART
OF
THE
BREAKER
WITH
THE
TEST
COUPLER
ENGAGED
,
All
spring
charged
mechanisms
related
to
a
breaker
must
.
be
serviced
only
by
skilled
and
knowledgeable
personnel
capable
of
releasing
each
spring
load
in
a
controlled
manner
.
PAR
-
TICULAR
CARE
MUST
BE
EXERCISED
TO
KEEP
PERSONNEL
CLEAR
OF
MECHANISMS
WHICH
ARE
TO
BE
OPERATED
OR
RELEASED
,
Information
on
construction
of
such
mechanisms
is
provided
in
this
in
-
struction
book
.
Operational
tests
and
checks
should
be
made
on
a
breaker
after
maintenance
,
before
it
is
returned
to
service
,
to
insure
that
it
is
capable
of
operating
properly
.
The
extent
of
such
tests
and
checks
should
be
consistent
with
the
level
of
maintenance
performed
,
If
maintenance
on
the
Power
/
Vac
*
breaker
is
being
performed
to
an
extended
schedule
such
as
a
5
-
year
or
10
-
year
program
the
vacuum
interrupter
integrity
test
should
be
performed
each
time
the
breaker
is
removed
from
the
metalclad
switchgear
for
reasons
other
than
scheduled
break
-
er
maintenance
if
it
has
been
more
than
one
year
since
the
last
vacuum
integrity
test
.
Interlocks
are
provided
for
the
safety
of
the
operator
and
correct
operation
of
the
breaker
,
If
an
interlock
does
not
function
as
described
DO
NOT
MODIFY
OR
DISFIGURE
THE
PARTS
.
DO
NOT
FORCE
THE
DEVICE
INTO
POSITION
.
CONTACT
THE
NEAREST
GE
APPARA
-
TUS
AND
ENGINEERING
SERVICE
OFFICE
FOR
INSTRUCTIONS
.
1.1
,
SAFETY
Each
user
has
the
responsibility
to
instruct
all
personnel
associated
with
this
equipment
on
all
safety
precautions
which
must
be
observed
.
\
*
7
-
•
•
The
following
are
recommendations
to
be
considered
in
a
user
’
s
safety
program
,
These
recommendations
are
not
in
-
tended
to
supplant
the
user
’
s
responsibility
for
devising
a
complete
safety
program
and
shall
not
be
considered
as
such
.
They
are
rather
suggestions
to
cover
the
more
important
aspects
of
personnel
safety
related
to
circuit
breakers
.
G
E
neither
condones
nor
assumes
any
responsibility
for
user
practices
which
deviate
from
these
recommendations
.
1.1
.
1
,
GENERAL
All
personnel
associated
with
installation
,
operation
and
maintenance
of
power
circuit
breakers
should
be
thoroughly
instructed
and
supervised
regarding
power
equipment
in
general
as
well
as
the
particular
model
of
equipment
with
which
they
are
working
.
Instruction
books
and
service
advices
should
be
closely
studied
and
followed
,
including
appropriate
sections
of
“
National
Electric
Safety
Code
"
ANSI
C
2
-
I
984
and
revisions
thereof
.
Maintenance
programs
must
be
well
planned
and
carried
out
consistent
with
both
customer
experience
and
man
-
ufacturer
’
s
recommendations
including
service
advices
and
instruction
books
.
Good
maintenance
is
essential
to
breaker
reliability
and
safety
.
-
•
•
Local
environment
and
breaker
application
must
be
con
-
sidered
in
such
programs
,
inclucp
-
jig
such
variables
as
ambient
temperatures
,
actual
continuou
^
current
,
number
of
opera
-
tions
,
type
of
interrupting
duty
,
and
any
unusual
local
condition
such
as
corrosive
atmosphere
or
major
insect
problems
.
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
G
E
Co
.
To
the
extent
required
,
the
products
described
herein
meet
applicable
ANSI
,
IEEE
and
NEMA
standards
,
but
no
such
assurance
is
given
with
respect
to
local
codes
and
ordinances
because
they
vary
greatly
.
*
Registered
Trademark
of
GE
.
•
.
*
:
t
Courtesy of NationalSwitchgear.com

both
rear
wheels
in
both
directions
to
prevent
any
accider
movement
.
2
.
DESCRIPTION
The
Power
Vac
*
vacuum
circuit
breaker
is
a
horizontal
drawout
removable and
interchangeable
interrupting
element
for
use
in
metalclad
switchgear
to
provide
protection
and
control
of
electrical
apparatus
and
power
systems
.
The
Power
Vac
*
Type
VB
1
circuit breaker
with
ML
-
I
8
mechan
-
ism
is
available
in
continuous
current
ratings
of
1200
and
2000
amperes
in
accordance
with
industry
standards
.
A
combina
-
tion
1200
2000
ampere
breaker
is
also
available
.
Refer
to
the
breaker
nameplate
for
complete
rating
information
of
any
particular
breaker
,
The
nameplate
also
describes
the
control
power
requirements
for
that
breaker
.
The
application
of
a
breaker
must
be
such
that
its
voltage
,
current
and
interrupting
ratings
are
never
exceeded
.
Since
this book
is
written
to
include
all
ratings
of
the
breaker
,
as
well
as
several
design
variations
,
the
instructions
will
be
of
a
general
character
and
all
illustrations
will
be
typical
unless
otherwise
specified
.
3.3
.
STORAGE
It
is
recommended
that
the
breaker
be
put
into
sen
immediately
in
its
permanent
location
.
If
this
is
not
possil
the
following
precautions
must
be
taken
to
assure
the
pro
)
storage
of
the
breaker
.
The breaker
should
be
carefully
protected
against
ct
densation
,
preferably
by
storing
it
in
a
warm
,
dry
room
moderate
temperature
such
as
40
°
to
100
°
F
.
High
humid
may
have
an
adverse
effect
on
the
insulating
parts
and
shot
be
avoided
.
Circuit
breakers
for
outdoor
metalclad
switc
gear
should
be
stored
in
the
equipment
only
when
power
available
and
the
heaters
are
in
operation
to
prevent
cc
densation
.
The
breaker
should
be stored
in
a
clean
location
,
free
fre
corrosive
gases
or
fumes
.
Particular
care
should
be
taken
protect
the
equipment
from
moisture
and
cement
dust
,
as
tl
combination
has
a
very
corrosive
effect
on
many
part
'
s
.
Rollers
,
latches
,
etc
.
of
the
operating
mechanism
should
1
coated
with
0282
A
2048
P
009
grease
to
prevent
rusting
.
3
.
RECEIVING
,
HANDLING
AND
STORAGE
3.1
.
RECEIVING
Each
breaker is
carefully
inspected
before
shipment
.
Im
-
mediately
upon
receipt
of
the
circuit
breaker
,
an
examination
should
be
made
for
any
damage
sustained
in
transit
.
If
injury
or
rough handling
is
evident
,
a
claim
should
be
filed
im
-
mediately
with
the
transportation
company
and
the
nearest
GE
Sales
Office
should
be
notified
,
It
is
expected
that
due
care
will
be
exercised
during
the
unpacking
and
installation
of
breakers
so
that
no
damage
will
occur
from
careless
or
rough
handling
,
or
from
exposure
to
moisture
or
dirt
.
Check
all
parts
against
the
packing
list
to
be
sure
that
no
parts
have
been
overlooked
.
...
If
the
breaker
is
stored
for
any
length
of
time
,
it
should
1
inspected
periodically
to
see
that
rusting
has
not
started
at
to
insure
good
mechanical condition
,
Should
the
breaker
1
stored
under
unfavorable
atmospheric
conditions
,
it
shou
be
cleaned and
dried
before
being
placed
in
service
;
v
,
’
\
v
.
-
'
-
4
.
INSTALLATION
4
,
1
.
SAFETY
PRECAUTIONS
This circuit
breaker
uses
powerful
springs
for
energ
storage
.
DO NOT
WORK
ON
THE
INTERRUPTERS
01
THE
MECHANISM
UNLESS
THE
CIRCUIT
BREAKE
!
IS
IN
THE
“
OPEN
”
POSITION
AND
BOTH
TH
CLOSING
AND
OPENING
SPRINGS
ARE
ElTliEI
DISCHARGED
OR
GAGGED
AND
ALL
ELEC
3.2
.
HANDLING
When
lifting
the
breake
^
use
of
the
specially
designed
lift
truck
is
recommended
.
It
is
-
necessary
to
use
the
truck when
placing
a
breaker
into
or
removing
it
from
the
TWO
-
HIGH
metalclad
equipment
.
If
it
is
necessary
to
lift
the
breaker
with
a
hoist
,
use
four
1
/
2
inch
diameter
hooks
rated
at
least
500
pounds
each
,
Lifting
locations
are
provided
in
the
frame
side
members
12
,
Fig
.
1
)
,
Use
a
spreader
wider
than
the breaker
to
prevent
the
slings
from
contacting
the
interrupter
supporting
insulating
material
parts
.
An
optional
accessory
lifting
sling
is
also
available
.
A
front
swivel
wheel
and
two
rear
wheels
are
provided
for
ease
of
movement
on
fiat
level
floors
.
When
unattended
breakers
are
left
on
a
floor
or
when
a
lift
truck
is
used
,
block
J
TRICAL
POWER
IS
REMOVED
.
These
precautions
ar
required
to
prevent
accidental
operation
.
Anyone
working
OJ
the
circuit
breaker
should
be
familiar
with
the
contents
of
thi
instruction
book
.
The
circuit
breaker
has
been
shipped
in
the
CLOSEE
position
.
After
removing
packing
material
,
open
the breake
:
by
pushing
in
on
the
manual
trip
button
(
3
,
Fig
.
2
)
,
Whilt
keeping
hands
away
front
moving
parts
,
and
verify
that
the
operation
counter
advances
one
count
.
2
Courtesy of NationalSwitchgear.com

r
'
:
\
4
,
2.4
.
POSITIVE
INTERLOCK
BAR
This
interlock
will
prevent
the
racking
of
a
closed
breaker
into
or
out
of
a
metalclad
compartment
.
A
linkage
connected
to
the
cross
shaft
extends
a
detente
angle
(
3
,
Fig
.
II
)
out
through
the
left
side
of
the
mechanism
frame
when
the
breaker
contacts
are
in
the
closed
position
.
If
the
breaker
is
fft
;
the
“
CONNECT
”
or
“
DISCONNECT
/
TEST
”
position
in
the
metalclad
the
detente
angle
locks
into
the
racking
mechanism
to
prevent
access
to
the
hex
section
of
the
racking
screw
.
;
Closing
and
opening
springs
are
now
in
their
discharged
positions
.
Check
this
by
first
pressing
the
manual
close
button
,
then
the
manual
trip
button
.
The
indicator
flags
on
the
front
of
the
breaker
should
show
“
OPEN
"
and
“
DIS
-
CHARGED
"
.
All
mechanical
and
electrical
checks
should
be
completed
before
putting
breakers
in
service
.
4.2
.
INTERLOCKS
Each
Power
/
Vac
*
vacuum
circuit
breaker
is
provided
with
the
following
interlocks
.
i
4.2
.
5
,
CLOSING
SPRING
GAG
INTERLOCK
This
interlock
is
provided
to
prevent
a
breaker
that
has
a
gagged
closing
spring
from
entering
a
metalclad
unit
,
This
function
is
accomplished
by
projecting
an
angle
(
1
,
Fig
.
II
)
out
of
the
left
front
side
of
the
mechanism
when
the
closing
spring
is
gagged
,
This
angle
will
interfere
with
the
racking
mee
.
lj
anism
and
block
entry
into
the
metalclad
unit
when
the
Closing
Spring
Gag
Access
Door
is
open
.
4.2
,
1
.
RATING
INTERFERENCE
PLATE
This
interlock
(
l
.
Fig
.
l
)
permits
only
a
breaker
with
a
matching
continuous
current
,
voltage
and
interrupting
rating
to
be
inserted
into
a
metalclad
compartment
of
identical
rating
.
The
combination
1200
/
2000
ampere
breaker
can
be
used
in
either
a
1200
or
a
2000
ampere
compartment
,
The
rating
interference
plate
must
be
adjusted
to
match
the
current
rating
of
the
compartment
.
This
adjustment
is
done
by
positioning
the
outer
interference
plate
so
that
the
edge
of
the
plate
lines
up
with
the
current
indicated
on
the
label
attached
,
to
the
breaker
just
above
the
rating
interference
plate
.
*
•
••
:
*
,
•
5
.
OPERATION
The
Power
/
Vac
*
vacuum
circuit
breaker
uses
a
sealed
vacuum
power
interrupter
to
establish
and
interrupt
a
pri
-
mary
circuit
.
Primary
connections
to
the
associated
metalclad
\
’
4.2
.
2
,
CLOSING
SPRING
DISCHARGE
INTERLOCK
This
interlock
(
4
,
Fig
,
12
)
prevents
racking
into
or
out
of
the
metalclad
compartment
a
breaker
that
has
the
closing
spring
charged
.
This
action
is
accomplished
by
a
roller
on
the
right
side
of
the
breaker
mechanism
which
contacts
the
racking
mechanism
and
discharges
the
closing
spring
unless
the
breaker
is
in
the
“
DISCONNECT
/
TEST
”
position
or
the
“
CONNECT
”
position
in
the
metalclad
compartment
.
This
interlock
also
opens
the
CL
/
M
§
j
|
witch
in
the
motor
circuit
to
prevent
electrical
charging
of
the
closing
spring
when
the
breaker
is
between
the
"
DISCONNECT
/
TEST
"
and
the
“
CONNECT
"
position
in
the
metalclad
compartment
.
switchgear
are
made
by
horizontal
bars
and
disconnect
fingers
,
electrically
and
mechanically
connected
to
the
vac
-
uum
interrupters
.
Molded
supports
,
one
per
pole
oh
a
'
three
pole
breaker
,
provide
interchangeable
mountings
for
primary
bars
,
interrupters
,
current
transfer
fingers
,
and
heat
dissipation
fins
(
where
used
)
.
The
operating
mec
^
aAl
'
^
provides
vertical
motion
at
each
pole
location
in
order
to
JiH
-
move
the
lower
contact
of
the
vacuum
interrupters
front
ap
open
position
to
a
spring
-
loaded
closed
position
and
then
back
to
the
open
position
on
command
The
ML
-
18
mechanism
(
Fig
,
9
)
is
of
the
stored
-
energv
type
and
uses
a
gearmotor
to
charge
a
closing
spring
.
During
a
closing
operation
,
the
energy
stored
in
the
closing
spring
is
used
to
close
the
vacuum
interrupter
contacts
,
charge
the
wipe
springs
which
load
the
contacts
,
charge
the
opening
springs
,
and
overcome
bearing
and
other
frictional
forces
,
The
energy
then
stored
in
the
wipe
and
opening
springs
will
open
the
contacts
during
an
opening
operation
,
Closing
and
opening
operations
are
controlled
electrically
by
the
control
switch
on
the
metalclad
door
or
remote
relaying
.
Mechanical
control
is
provided
by
manual
close
and
4
,
2.3
.
NEGATIVE
INTERLOCK
ROLLER
The
function
of
this
interlock
(
5
,
Fig
,
II
)
is
to
remove
the
trip
latch
from
the
trip
roller
thereby
preventing
a
closing
operation
.
The
interlock
also
opens
the
LCS
switch
in
the
closing
circuit
thereby
removing
the
close
circuit
.
power
,
The
negative
trip
interlock
is
functional
while
the
breaker
is
being
moved
between
the
“
DISCONNECT
/
TEST
"
and
the
“
CON
-
NECT
"
position
in
the
metalclad
and
upon
withdrawal
from
the
metalclad
compartment
,
s
'
h
'
3
Courtesy of NationalSwitchgear.com

trip
buttons
on
the
circuit
breaker
.
The
closing
spring
may
be
manually
charged
,
and
a
method
for
slow
closing
the
primary
contacts
is
available
when
the
circuit
breaker
is
withdrawn
from
the
metalclad
cubicle
.
See
MECHANICAL
CHECK
-
ING
AND
SLOW
CLOSING
,
The
mechanism
will
operate
at
the
a
-
c
or
d
-
c
voltage
indicated
on
the
circuit
breaker
nameplate
.
Manual
pumping
of
the
handle
advances
the
ratchet
wheel
and
the
holding
pawl
prevents
counter
-
rotation
while
,
the
handle
is
returning
for
another
stroke
.
Six
to
eight
complete
strokes
of
the
manual
handle
are
required
for
one
complete
spring
-
charging
operation
.
When
the
spring
charge
indicatoj
(
9
,
Fig
.
3
)
shows
“
CHARGED
”
,
MANUAL
CHARGING
MUST
BE
DISCONTINUED
TO
AVOID
MECHANISM
DAMAGE
.
5.2
.
CLOSING
OPERATION
.
(
REFER
TO
FIG
.
9
)
By
either
energizing
the
close
solenoid
or
depressing
the
manual
close
button
,
the
close
latch
(
8
,
view
C
)
is
rotated
,
releasing
the
closing
spring
(
1
,
view
B
)
.
This
action
releases
the
'
energy
in
the
closing
spring
and
transmits
it
to
the
closing
cam
(
9
,
view
D
)
and
closing
roller
(
10
,
view
D
)
arid
causes
the
linkage
to
rise
until
the
prop
(
1
l
,
view
D
)
can
Slip
under
the
close
roller
(
10
,
view
D
)
and
hold
the
linkage
in
place
.
As
the
linkage
moves
,
the
output
crank
(
12
,
view
D
)
rotates
the
cross
shaft
(
13
,
view
D
)
which
in
turn
rotates
the
phase
bell
cranks
(
14
,
view
E
)
on
all
three
poles
.
The
rotation
of
the
phase
bell
cranks
compresses
the
two
opening
springs
(
15
,
view
E
)
on
poles
1
and
3
,
closes
the
vacuum
interrupters
and
compresses
the
wipe
springs
(
16
,
view
E
)
on
each
pole
.
The
rotation
of
the
cross
shaft
(
13
,
view
D
)
also
changes
the
auxilliary
switch
(
17
,
view
D
)
position
and
the
position
flag
on
the
front
panel
will
then
indicate
“
CLOSED
”
.
After
the
breaker
is
closed
,
the
charging
motor
is
again
energized
and
the
closing
spring
is
charged
as
described
under
“
CLOSE
SPRING
CHARG
-
ING
”
.
Spring
charging
is
possible
when
the
breaker
is
in
the
closed
position
because
the
linkage
is
held
in
place
by
the
prop
.
C
-
s
5.1
,
CLOSE
SPRING
CHARGING
Figure
9
shows
a
front
view
of
the
ML
-
18
in
a
schematic
form
.
The
primary
contacts
are
open
and
the
closing
springs
charged
.
The
closing
spring
charging
system
consists
of
a
closing
spring
(
l
.
view
B
)
mounted
on
the
left
side
of
the
breaker
and
the
electrical
charging
system
mounted
on
the
right
side
of
the
breaker
.
Both
components
are
fastened
to
the
cam
shaft
(
2
,
view
B
)
,
A
manual
charging
system
(
3
,
view
A
)
is
provided
so
that
the
mechanism
can
be
slow
closed
and
the
closing
spring
can
be
charged
if
there
is
a
loss
of
electrical
control
power
.
Spring
charging
is
accomplished
electrically
by
a
rotating
eccentric
on
the
output
shaft
of
the
gear
motor
driving
pivoted
charging
arms
(
4
,
view
C
)
that
oscillate
about
the
centerline
of
a
ratchet
wheel
(
5
,
view
C
)
.
A
driving
pawl
(
6
,
view
C
)
,
mounted
within
the
charging
arms
,
oscillates
with
the
charging
arms
.
Starting
from
its
rear
-
most
position
,
as
the
charging
arms
rotate
forward
,
a
spring
forces
engagement
of
the
driving
pawl
with
a
tooth
on
the
ratchet
wheel
.
The
ratchet
wheel
is
advanced
by
the
rotating
charging
arms
and
pawl
assembly
.
Advancement
of
one
tooth
spacing
is
provided
for
each
oscillation
of
the
system
,
The
ratchet
motion
is
restricted
to
one
direction
by
a
spring
-
loaded
holding
pawl
that
prevents
the
ratchet
wheel
from
going
backwards
as
the
charging
arms
oscillate
back
to
pick
up
the
next
tooth
.
Thirteen
complete
cycles
of
the
charging
arms
are
needed
for
a
full
charge
of
the
closing
spring
.
The
efficient
,
compact
gear
motor
accomplishes
this
action
in
just
about
two
seconds
.
When
the
charging
cycle
is
.
^
omplete
,
the
ratchet
wheel
is
positioned
so
that
a
missing
to
.
oth
is
adjacent
to
the
driving
pawl
and
any
motor
overspin
will
not
drive
the
ratchet
wheel
,
thus
preventing
damage
to
the
system
,
When
the
spring
is
completely
charged
,
the
assembly
is
retained
in
that
position
by
the
close
latch
,
until
it
is
desired
to
close
the
circuit
breaker
.
The
closing
coil
cannot
be
electrically
energized
unless
the
closing
spring
is
completely
charged
.
This
action
is
prevented
by
the
52
CHG
switch
in
the
closing
circuit
.
The
manual
charging
system
(
3
,
view
A
)
works
directly
on
the
cam
shaft
where
a
one
-
way
clutch
(
7
,
view
A
)
driven
by
a
manual
handle
provides
rotation
of
the
ratchet
wheel
.
i
5.3
.
OPENING
OPERATION
.
(
REFER
TO
FIG
.
9
)
By
either
energizing
the
trip
solenoid
(
18
,
view
.
B
)
or
depressing
the
manual
trip
button
(
23
,
view
B
)
,
the
trip
,
latch
(
19
,
view
D
)
is
rotated
,
permitting
the
linkage
to
collapse
and
the
vacuum
interrupter
contacts
to
open
under
the
force
of
the
wipe
springs
(
16
,
view
E
)
and
opening
springs
(
15
,
view
E
)
,
At
the
end
of
the
opening
stroke
the
center
phase
wipe
spring
assemble
hits
the
stop
on
the
frame
that
limits
overtravel
and
rebound
,
Rotation
of
the
cross
shaft
from
the
closed
to
the
open
position
operates
the
auxiliary
switch
(
17
,
view
D
)
which
opens
the
trip
coil
circuit
.
If
the
closing
spring
has
been
recharged
,
the
linkage
will
be
reset
and
the
trip
latch
will
be
in
place
on
the
trip
roller
ready
for
another
closing
operation
.
V
*
?
:
>
"
*
:
v
If
the
closing
spring
has
not
been
recharged
,
the
trip
latch
may
be
held
out
of
position
.
A
latch
-
checking
switch
(
21
.
,
view
C
)
will
not
close
unless
the
latch
is
in
its
normal
position
!
The
contacts
of
this
latch
-
checking
switch
are
in
the
closing
circuit
so
that
electrical
closing
is
blocked
when
the
trip
latch
not
reset
.
4
Courtesy of NationalSwitchgear.com

r
the
spring
load
is
held
by
the
closing
latch
,
the
spring
indicator
(
8
,
Fig
,
2
)
will
change
from
“
DISCHARGED
”
to
“
CHARGED
”
,
and
a
positive
snap
will
be
heard
as
the
spring
travels
over
center
,
After
the
spring
is
completely
charged
,
as
indicated
above
,
further
forcing
the
charging
handle
may
cause
damage
to
the
closing
latch
and
its
associated
parts
.
5.4
,
TRIP
-
FREE
OPERATION
.
(
REFER
TO
FIG
.
9
)
The
linkage
is
mechanically
trip
-
free
in
any
location
on
the
closing
stroke
.
Electrically
energizing
the
trip
coil
while
closing
will
,
after
the
auxiliary
switch
contacts
change
po
-
sition
,
rotate
the
trip
latch
and
permit
the
circuit
breaker
to
open
fully
.
The
linkage
will
reset
as
in
a
normal
open
operation
and
the
closing
spring
will
recharge
as
described
under
SPRING
CHARGING
.
7.3
.
CLOSING
SPRING
GAG
Insert
the
closing
spring
gag
plate
(
1
,
Fig
.
4
)
by
opening
the
closing
spring
gag
hole
cover
and
inserting
the
tip
of
the
,
gag
plate
between
the
end
of
the
spring
and
the
spring
guide
and
engaging
the
detentes
on
the
gag
plate
into
the
slots
In
‘
the
closing
spring
guide
.
Note
that
when
the
closing
spring
'
guide
is
exposed
for
gagging
,
an
interference
angle
is
exposed
on
the
left
side
of
the
breaker
(
I
,
Fig
.
II
)
.
With
the
closing
spring
in
the
gagged
position
,
this
angle
will
provide
interference
preventing
use
of
the
lift
truck
and
racking
of
the
breaker
element
.
No
attempt
should
be
made
to
alter
,
,
modify
-
or
othewise
make
inoperative
this
safety
feature
.
With
the
gag
plate
in
position
,
depress
the
manual
close
button
.
This
action
will
partially
discharge
the
closing
spring
and
also
partiaiiy
close
the
vacuum
interrupter
contacts
.
Do
not
energize
tjie
secondary
control
circuit
at
this
time
.
6
.
CONTROL
CIRCUIT
A
typical
POWER
/
VAC
circuit
breaker
ML
-
18
mechan
-
ism
wiring
diagram
is
shown
in
Fig
.
10
.
Check
the
wiring
diagram
supplied
with
the
actual
circuit
breaker
for
its
wiring
.
The
close
spring
charging
motor
circuit
is
established
through
the
CL
/
MS
switch
if
the
close
latch
is
reset
and
the
SM
/
LS
switch
if
the
closing
spring
is
discharged
,
When
the
closing
spring
is
charged
,
the
SM
/
LS
interrupts
the
circuit
.
The
close
coil
circuit
is
established
through
two
normally
closed
52
Y
relay
contacts
,
and
the
latch
checking
switch
LCS
,
if
the
trip
latch
is
reset
.
An
auxiliary
switch
contact
52
b
is
also
in
series
with
the
close
coil
and
closes
when
the
breaker
is
open
and
opens
when
the
breaker
is
closed
.
During
a
,
close
operation
,
cam
rotation
closes
the
SM
/
LS
contact
allowing
the
52
Y
relay
to
be
energized
opening
its
contacts
in
the
close
coil
circuit
and
sealing
itself
in
through
one
of
its
own
contacts
to
the
close
signal
.
This
seal
-
in
action
prevents
reclosing
on
a
sustained
close
command
as
the
close
signal
must
be
removed
to
drop
out
the
Y
relay
and
reestablish
the
closing
circuit
,
thereby
providing
an
anti
-
pump
feature
.
Circuit
breaker
mounted
auxiliary
switch
contacts
not
used
in
the
control
circuit
are
brought
out
for
control
and
indication
functions
.
The
metalclad
equipment
may
provide
a
breaker
-
operated
stationary
auxiliary
switch
for
addtional
contacts
.
S
'
'
\
7
,
4
.
SLOW
CLOSING
To
manually
slow
close
the
breaker
contacts
,
put
the
manual
charge
handle
on
the
manual
charge
lever
and
move
the
handle
up
and
down
.
The
breaker
will
be
fully
closed
when
the
spring
charge
indicator
shows
“
CHARGED
;
(
CA
UT
10
N
:
WITH
THE
GAG
PLATE
INSTALLED
.
THt
BREAKER
CLOSED
AND
OPENING
SPRINGS
CHARGED
,
THE
BREAKER
CAN
BE
TRIPPED
AT
FULL
SPEED
.
y
•
\
7.5
.
GAG
PLATE
REMOVAL
To
remove
the
gag
plate
,
the
closing
spring
must
be
ftillv
charged
.
If
the
spring
charge
indicator
does
not
show
“
CHARGED
"
in
the
window
,
manually
charge
the
spring
until
it
does
.
Lift
up
and
push
in
on
the
gag
plate
to
clear
the
detentes
on
the
gag
plate
from
the
slots
in
the
closing
spring
guide
.
While
holding
the
gag
plate
up
,
remove
it
from
the
opening
.
Close
the
gag
hole
cover
.
For
safety
,
first
close
the
breaker
by
depressing
the
manual
“
CLOSE
”
button
and
then
depress
the
manual
“
TRIP
"
button
.
All
stored
energy
is
'
tiSW
v
^
$
r
'
7
.
MECHANICAL
CHECKING
AND
SLOW
CLOSING
7
*
1
.
VISUAL
INSPECTION
Visually
inspect
the
circuit
breaker
for
any
signs
of
damage
or
loose
hardware
.
7.2
.
CLOSING
SPRING
CHARGING
Manually
charge
the
breaker
closing
spring
using
the
charging
handle
provided
(
l
,
Fig
,
5
)
,
The
closing
spring
is
charged
by
a
ratcheting
mechanism
that
advances
by
one
ratchet
tooth
at
a
time
.
When
the
spring
is
fully
charged
and
removed
from
the
breaker
.
5
Courtesy of NationalSwitchgear.com

8
.
DIMENSIONAL CHECKS
With
the
breaker
closed
and
the
gag
plate
installed
,
perform
the
following
dimensional
checks
:
Measure
the
distance
between
the
two
lines
.
A
caliper
wi
give
an
accurate
reading
of
the
contact
gap
,
Dimension
0
The
gaps
must
be
between
the
0.600
inch
maximum
and
0
.
S
4
inch minimum
.
It
is
not
necessary
that
all
readings
cOrres
pond
,
A
properly
adjusted
breaker
will
have
more
gap
an
wipe
on
the
center
pole
than
on
the
outside
poles
.
The
following
dimensional
checks
are
in
the
operatin
mechanism which
is
accessible
from
the
bottom
.
To
accommc
date
these checks
,
the
breaker
should
be
turned
on
its
rigb
side
resting
on
two
-
by
-
fours
.
DO
NOT
use
the
portabl
breaker
lift
truck
.
CAUTION
:
do
not
allow
anything
to
com
in
contact
with the interlock
roller
on
the
right
side
of
th
mechanism
.
T
;
V
(
8.1
.
PRIMARY
CONTACT EROSION
With
the
closed
position
,
the erosion
disk
(
5
,
Fig
,
7
)
below
the
operating
rod
insulator
is
aligned
with
a
reference
arm
(
4
,
Fig
.
7
)
on
new
interrupters
.
As
contact
erosion
occurs
,
the
erosion
disk
will
move
upward
from
alignment
with
that
reference
arm
.
This
is
dimension
E
in
Figure
7
,
Detail
A
,
When
erosion
reaches
1
/
8
inch
,
the
POWER
/
VAC
*
inter
-
rupter
^
should be
replaced
.
Do
not
readjust
the
alignment of
the
erosion
indicator
arm
except
when
installing
a
new
vacuum
interrupter
,
8.4
.
CLOSE COIL
PLUNGER
GAP
The close
coil
plunger
gap
is
shown
in
Figure
C
.
With
th
'
closing
spring
discharged
,
operate
the
plunger
to
imak
<
certain
that
the
plunger
moves
freely
over
its
full
stroke
itith
coil
.
To
check
the
closing
coil
plunger
gap
the
breaker
sjbtduh
be
open
and
the
closing spring
charged
and
gagged
.
Dimen
sion
C
is
obtained
depressing
the
close
plunger
button
unti
resistance
is
felt
.
The
gap
between
the
plunger
button and
th
<
coil
housing
should
be
between
0.250
and
0.300
of
an
inch
.
8.5
.
TRIP
COIL
PLUNGER
GAP
8.2
.
SPRING
WIPE
With
the
breaker
closed
and
the
closing spring
gagged
,
measure
with
a
feeler
gauge
and
record
the
distance
between
the
top
of
the
wipe
indicator
and the bottom
of
the
erosion
disk
for
each
phase
(
see
Figure
W
,
Dimension
W
)
,
Trip
the
breaker
with
the
closing
spring
gag
plate
still
installed
and
measure
and record
the
distance
between
the
wipe
indicator
and
erosion disk
.
Subtract
the
closed
position
measurement
from
the
open
position
measurement
.
The
result
is the
amount
of
wipe
on
each
individual
pole
.
The
wipe
,
dimension
W
,
is
to
be
greater
than
0.075
inch
.
Adjustment
is
not
required
until
wipe
is
0.075
inch
or
less
.
If
adjustment
is
required
see
WIPE
ADJUSTMENT
in
MECHANICAL
ADJUST
-
MENTS
section
.
The
ML
-
18
mechanism
is
furnished
with
very
low
gradient
wipe
springs
so
that
adjustment
is
not
a
precision operation
and
considerable
loss
of
wipe
can
be
tolerated without
affecting
performance
.
The
trip
coil
plunger
gap
is
shown
in
Figure
T
.
With
th
<
breaker
in
the
open
position
and the
closing
spring
jn
tin
charged
position
,
make
certain
that
the
trip
linkage
and
trip
shaft
move
freely
over
the
full
plunger
travel
.
To
check
tin
trip
coil
plunger
gap
adjustment
,
the
breaker
is
to
be closet
with
the
closing spring
discharged
.
Dimension
T
between
the
plunger
button
and
the
coil
housing
should
be
between
6.20
C
and
0.250
inch
.
This
dimension
is
obtained
when
the
trip
plunger
button
is
depressed
until
resistance is felt
.
If
the
breaker
is
equipped
with
an
optional
second
trip
coil
;
us
<
same
procedure
.
8.6
.
CONTROL
SWITCH
ADJUSTMENT
•
‘
vV
:
:
;
'
V
'
;
L
7
8.3
.
CONTACT
GAP
The
method
of
measuring
the
contact
gap
is
as
follows
:
With
the
breaker
in
the
open
position
,
the
closing springs
charged
and
the
closing
spring
gag
plate
installed
,
apply
a
piece
of
masking
tape
to
the
surface of
the
operating
rod
insulator
as
shown
in
Figure
G
.
Using
a
reference
block
,
make
a
mark
on
the
tape
near
the
top
on
all
three
poles
.
It
is
also
advisable
to
put
a
reference
mark
on
the
tape
to
identify
to
which
pole
the
tape
is
applied
.
Remove
the
closing
spring
gag
plate
and close
the breaker
,
Using
the
same
procedure
as
above
,
re
-
mark
the
tape
.
This
new
mark
will
be
near
the
bottom
of
the
tape
.
Trip
the
breaker
,
remove
the
tapes
and
re
-
apply
them
to
a
flat
surface
.
The
breaker
is
to
be
in
the
open
position
with
the
opening
and
closing
springs
discharged
.
This
results
in
the
control
switch
plungers
being
in
the
depressed
position
.
The
switches
to
be
checked
.
are
shown
in
Figure
S
.
On
the
LCS
and
stacked
switches
(
SM
/
LS & CHG
)
,
the
plunger
rod
is
to
be
recessed
within
the
rear
of
the
switch
body
and
this
recess
is
to
be
6
to
1
/
32
inch
.
This is
a
visual
check
.
The
CL
/
MS
switch
with
wiring
terminals
on
the side
is
to
be
adjusted
as
described
above
.
For
the
CL
/
MS
switch
with
wiring
terminals
on
the
rear
the
plunger
is
set to
a
dimension
of
0.990
to
1.010
”
from
its
mounting
bracket
.
The
breaker
can now
be
placed
,
in
its
normal
upright
position
.
•
*
V
*
6
Courtesy of NationalSwitchgear.com

The
machine
should
be
connected
with
its
output
potential
at
zero
and
the
voltage
increased
to
the
test
voltage
and
that
voltage
maintained
for
60
seconds
.
The
voltage
should
then
be
returned
to
zero
and
the
hipot
machine
removed
from
the
circuit
,
Do
not
exceed
the
test
voltage
indicated
for
the
applicable
breaker
voltage
rating
.
;
;
9.2
.
2
,
SECONDARY
CIRCUIT
Prior
to
hipotting
the
breaker
secondary
circuit
,
disconnect
the
motor
leads
and
thread
a
wire
connecting
together
all
secondary
disconnect
pins
except
#
24
the
ground
pin
.
Con
?
nect
the
hipot
machine
from
this
wire
to
ground
,
Increase
the
voltage
to
1125
volts
(
rms
)
60
Hz
and
maintain
for
60
seconds
Reduce
the
voltage
to
zero
and
remove
the
hipot
machine
from
the
circuit
.
Remove
the
wire
connecting
the
secondary
disconnect
pins
and
reconnect
the
motor
leads
9
,
3
.
PRIMARY
CIRCUIT
RESISTANCE
I
9
,
ELECTRICAL
CHECKS
Electrical
checking
consists
of
electrical
breaker
operation
,
primary
and
secondary
wiring
high
-
potential
testing
(
if
re
-
quired
)
,
primary
circuit
resistance
(
if
required
)
,
POWER
/
VAC
*
interrupter
high
-
potential
testing
,
and
insulation
re
-
sistance
to
ground
.
9.1
.
ELECTRICAL
OPERATION
To
check
the
electrical
operation
,
attach
a
secondary
test
coupler
to
the
circuit
breaker
connector
.
Check
the
control
voltage
on
the
nameplate
and
close
and
open
the
breaker
a
couple
of
times
.
CAUTION
:
REPEATED
OPERATIONS
AT
A
RATE
EXCEEDING
TWO
PER
MINUTE
WILL
CAUSE
CHARG
-
ING
MOTOR
OVERHEATING
AND
FAILURE
.
I
’
A
resistance
check
of
the
primary
circuit
may
be
made
with
the
breaker
closed
.
Use
a
low
resistance
measuring
instfumelfit
which
measures
microhms
.
The
100
ampere
reading
should
be
25
to
50
microhms
for
a
2000
amp
.
breaker
and
,
30
to
60
microhms
for
a
1200
amp
.
breaker
when
connected
across
the
primary
bars
on
the
breaker
side
of
the
disconnect
fingers
Leave
the
circuit
breaker
in
an
open
and
spring
discharged
Condition
after
ohecks
are
complete
and
refer
to
metalclad
instruction
book
GEK
39672
before
inserting
the
circuit
breaker
into
a
metalclad
unit
,
Reinstall
the
front
cover
if
it
has
been
removed
.
t
"
9.4
.
VACUUM
INTERRUPTER
INTEGRITY
TEST
•
9.2
.
HIGH
-
POTENTIAL
TEST
If
high
potential
tests
to
check
the
integrity
of
the
insulation
are
required
,
the
A
-
C
high
potential
test
described
below
is
strongly
recommended
.
D
-
C
high
potential
testing
is
not
recommended
except
for
the
VACUUM
INTERRUPTER
INTEGRITY
TEST
.
The
following
procedure
must
be
ad
-
hered
to
,
,
CAUTION
:
IF
D
-
C
HIGH
POTENTIAL
TESTING
IS
REQUIRED
,
THE
D
-
C
HIGH
POTENTIAL
MACHINE
MUST
NOT
PRODUCE
PEAK
VOLTAGE
^
EXCEEDING
50
KV
.
1
-
V
CAUTION
X
-
RADIATION
WILL
BE
PRODUCED
IF
AN
ABNORMALLY
HIGH
VOLTAGE
IS
APPLIED
ACROSS
A
PAIR
OF
ELECTRODES
IN
A
VACUUM
.
X
-
RADIATION
WILL
INCREASE
AS
VOLTAGE
INC
CREASES
AND
/
OR
AS
CONTACT
SEPARATION
DE
CREASES
.
ONLY
TEST
A
CORRECTLY
ADT
0
STED
CIRCUIT
BREAKER
.
.
.
.
.
i
'
r
.
-
cS
/
fe
-
'
DURING
A
HIGH
POTENTIAL
OR
A
VACUUM
.
IN
TEGRITY
TEST
ANY
X
-
RADIATION
WHICH
MAY
BE
PRODUCED
WILL
NOT
BE
HAZARDOUS
AT
A
DIS
-
TANCE
SAFE
FOR
HIGH
POTENTIAL
TESTING
.
IF
THE
TEST
IS
CONDUCTED
AT
THE
RECOM
-
MENDED
VOLTAGE
AND
WITH
THE
NORMAL
OPEN
CIRCUIT
BREAKER
CONTACT
GAP
i
.
4
9.2
.
1
.
PRIMARY
CIRCUIT
The
breaker
should
be
hipotted
in
the
closed
breaker
mode
.
An
A
-
C
hipot
machine
capable
of
producing
the
test
voltages
shown
below
may
be
used
to
hipot
the
breaker
phase
to
phase
and
phase
to
ground
.
DO
NOT
APPLY
VOLTAGE
THAT
IS
HIGHER
THAN
THE
RECOMMENDED
VALUE
.
DO
NOT
USE
CON
-
'
TACT
SEPARATION
THAT
IS
LESS
THAN
THfe
RE
-
COMMENDED
OPEN
-
POSITION
BREAKER
CON
-
TACT
GAP
.
This
test
of
the
vacuum
interrupter
will
determine
its
internal
dielectric
condition
and
vacuum
integrity
,
With
the
,
breaker
open
,
individually
check
each
interrupter
by
con
-
necting
the
hipot
machine
“
HOT
”
lead
to
the
upper
stud
BREAKER
VOLTAGE
4
,
16
KV
7.2
KV
13.8
KV
TEST
VOLTAGE
14
KV
27
KV
27
KV
•
1
-
•
.
r
1
Courtesy of NationalSwitchgear.com

and
the
ground
lead
to
the
lower
stud
.
If
the
machine
has
a
center
point
ground
,
the
connections
may
be
made
either
way
.
Apply
36
K
V
(
rms
)
60
Hz
or
50
KV
DC
and
hold
five
(
5
)
to ten
(
10
)
seconds
.
If
no
breakdown
occurs
,
the
interrupter
is
in
acceptable
condition
.
If
a
breakdown
occurs
,
the
interrupter
should
be
replaced
.
No
attempt
should
be
made
to
try
to
compare
the
condition
of
one
vacuum
interrupter
with
another
nor
to
correlate
the
condition
of
any
interrupter
to
low
values
of
D
-
C
leakage
current
.
There
is
no
significant
correlation
.
After
the
high
potential
voltage
is
removed
,
discharge
any
electrical
charge
that
may
be
retained
.
To
measure
the
breaker
secondary
circuit
insulation
resis
-
tance
,
disconnect
the
motor
leads
and
thread
necting
together
all
secondary
disconnect
pins
except
#
24
the
ground
pin
.
The
measurement
is
made
by
connecting
a
500
V
megohmeter
from
the
wire
to
ground
.
10
.
INTERLOCK
FUNCTIONAL
CHECK
Verify
that
spacing
between
the
lower inside
edges
of
the
breaker
roller track
in
the
metalclad
compartment
is
29.807
”
min
.
to
29
,
857
”
max
.
Check
that
the
breaker is
OPEN
and
that
the
closing spring
is
DISCHARGED
.
Install
the
POWER
/
VAC
*
circuit breaker into the
DISCONNECT
/
TEST
posi
-
tion
in
the
metalclad
compartment
.
CAUTION
IF
THE
COMPARTMENT SECONDARY
CONTROL
CIRCUITS
ARE
ENERGIZED
,
THE
FOLLOWING
PROCEDURE
MUST
BE
FOLLOWED TO
PREVENT
ARCING
AND
BURNING
OF
THE
MOTOR
CIRCUIT
PINS
IN
THE
SECONDARY
CONTACT
BLOCKS
.
Either
charge
the
closing
spring
MANUALLY
,
or
push
in
and hold the
manual
CLOSE
button
to
open
the
motor
circuit
,
then
pull
down
the
handle and extend
the
breaker
secondary
control
contact
block
to
FIRMLY
engage
with
its
mating
secondary
control
contact
block
in
the
compartment
.
Release
CLOSE
button
to
activate
spring charging
motor
.
If
control
power
is
available
,
close
the
circuit
breaker
using
the control
switch
on
the
compartment
door
.
This
operation
will
check the
adjustment
of
the
52
/
LCS
switch
.
If
the breaker
will
not
close
electrically
.
,
recheck the
52
/
LCS
adjustment
.
If
control
power
is
not
available
push
the manual close button
and
recharge
the
closing spring manually
.
Spring
charging
will
occur
automatically
if
control
power
is
connected
.
With
the breaker
in
the
CLOSED
condition
,
attempt
to
install
the
racking
crank
.
The
racking
crank should be
blocked
by
the
POSITIVE
INTERLOCK
.
Trip
the
breaker
and
install
the
racking
crank
and
rack the
breaker
toward
the
connected
position
five
(
5
) complete
turns
.
During
the
five
turns
,
usually
between
the
third and fourth
turns
,
the
spring
discharge
interlock
will
discharge
the
closing
spring
.
The
contacts
of
the
circuit breaker should
remain
open
.
If
adjustment
is
required
see
INTRODUCTION
,
SPECIFIC
,
par
.
6
.
and
MECHANICAL
ADJUSTMENTS
sections
16.7
and
16.8
.
Rack
the
breaker
into the
CONNECTED
position
and
charge
the
closing spring
.
If
secondary
control
power
i
$
available
the
closing
spring
will
charge
automatically
.
Assure
that
the
breaker
is
in
the
OPEN
condition
.
Rack
the
breaker
toward the
TEST
/
DISCONNECT
posi
-
.
tion
three
(
3
) complete
turns
.
During
the
three
turns
,
the
spring
discharge
interlock
should
discharge
the
closing
spring
and
the
breaker
contacts
should
remain
OPEN
,
If
adjustment
is
required
see
INTRODUCTION
,
SPECIFIC
,
par
.
6
.
a
wire
con
-
04
UTION
:
MANY
D
-
C
HIGH
POTENTIAL
MACHINES
ARE
HALFWAVE
RECTIFIERS
.
THIS
TYPE
OF
HI
-
POT
TESTER
MUST
NOT
BE
USED
TO TEST
VACUUM
INTERRUPTERS
.
THE
CAPACITANCE
OF
THE
POW
-
ER
/
VAC
*
BOTTLES
IS
VERY
LOW
AND
THE
LEAK
-
AGE
IN
THE
RECTIFIER
AND
ITS
D
-
C VOLTAGE
MEASURING
EQUIPMENT
IS
SUCH
THAT
THE
PULSE
FROM
THE
HALFWAVE
RECTIFIER
MAY
BE
IN
THE
^
'
NEIGHBORHOOD
OF
120
kv
WHEN
THE
METER
IS
d b
>
ACTUALLY
READING
40
kv
.
IN
THIS
CASE
,
SOME
PERFECTLY
GOOD
BOTTLES
CAN
SHOW
A
RELA
-
TIVELY
HIGH
LEAKAGE
CURRENT
SINCE
IT
IS
THE
PEAK
VOLTAGE OF
120
kv
THAT
IS
PRODUCING
ERRONEOUS
BOTTLE
LEAKAGE
CURRENT
.
IN
AD
-
DITION
,
ABNORMAL
X
-
RADIATION
WILL
BE
PRO
-
DUCED
.
•
i
An
acceptable
high
potential
machine
is
available
from
:
Medium
Voltage
Switchgear
Operations
,
Burlington
,
Iowa
,
Catalog
Number
282
A
2610
P
001
.
The
following
machines
are
also
acceptable
.
Hipotronics
Hipotronics
Hipotronics
James
G
.
Biddle
Model
860
PL
Model
880
PL
Model
7
BT
60
A
Catalog
222060
9.5
.
INSULATION
TESTS
Since
definite limits
cannot
be
given
for
satisfactory
insulation
values
,
a
record should
be
kept
of
the
megohmeter
readings
as
well
as
temperature
and
humidity
readings
.
This
record
should
be
used
to
detect
any
weakening
of
the
insulation
from
one
check
period
to
the
next
.
Generally
readings
should
equal
or
exceed
10
,
000
megohms
.
The
primary
circuit insulation
on
the
breaker
may
be
checked
phase
to
phase
and
phase
to
ground
using
a
2500
V
or
other
suitable
megohmeter
.
8
Courtesy of NationalSwitchgear.com

11
.
MAINTENANCE
Salt
spray
Changes
in
temperature
that
produce
condensation
Conductive
and
/
or
abrasive
dust
Damaging
chemicals
and
fumes
Vibration
or
mechanical
shock
High
relative
humidity
(
90
%
)
Temperature
extremes
(
below
-
30
°
C
or
above
40
°
C
)
BEFORE
ANY
MAINTENANCE
WORK
IS
PERFORM
-
ED
,
MAKE
CERTAIN
THAT
ALL
CONTROL
CIRCUITS
ARE
DE
-
ENERGIZED
AND
THAT
THE
BREAK
-
ER
IS
REMOVED
FROM
THE
METALCLAD
UNIT
.
DO
NOT
WORK
ON
THE
BREAKER
OR
MECHANISM
WHILE
IT
IS
IN
THE
CLOSED
POSITION
WITHOUT
TAKING
PRECAUTIONS
TO
PREVENT
ACCIDENTAL
TRIPPING
.
DO
NOT
WORK
ON
THE
BREAKER
WHILE
THE
CLOSING
SPRING
IS
CHARGED
UNLESS
IT
IS
SECURED
IN
THAT
POSITION
BY
THE
CLOSING
SPRING
GAG
.
*
1
11.1
.
GENERAL
POWER
/
VAC
*
circuit
breakers
have
been
designed
to
be
as
maintenance
-
free
as
practicable
.
They
include
features
such
as
sealed
vacuum
interrupters
and
long
-
life
synthetic
greases
which
contribute
to
many
years
of
trouble
-
free
performance
with
a
minimum
amount
of
maintenance
.
POWER
/
VAC
*
INTERRUPTER
The
POWER
/
VAC
*
interrupter
used
in
this
breaker
is
a
reliable
,
clean
interrupting
element
.
Since
the
contacts
are
contained
in
a
vacuum
chamber
,
they
remain
clean
and
require
no
maintenance
at
any
time
,
The
metallic
vapors
eroded
from
the
contact
surfaces
during
high
current
inter
-
ruption
remain
in
the
chamber
and
are
deposited
on
metal
shields
thus
insuring
a
high
dielectric
value
of
the
vacuum
and
the
walls
of
the
interrupter
.
i
.
-
•
*
5
^
-
4
*
•
rb
.
11.3
.
FAULT
INTERRUPTIONS
The
erosion
rate
of
the
primary
contacts
in
the
vacuum
interrupters
is
very
low
for
no
-
load
and
normal
load
switch
ing
operations
.
However
,
fault
current
interruptions
,
^
t
|
or
near
the
breaker
rating
may
result
in
appreciable
.
contact
erosion
.
With
frequent
fault
interruptions
it
is
necessarjijtp
perform
maintenance
based
on
the
number
of
interruptions
.
After
each
15
fault
interruptions
the
following
should
be
performed
:
1
.
Contact
erosion
check
.
2
.
Wipe
and
gap
check
.
3
.
Vacuum
interrupter
integrity
test
TROUBLE
REPORTING
Although
all
reputable
manufacturers
design
their
prod
-
ucts
to
perform
satisfactorily
with
a
minimum
of
problems
,
the
IEEE
Switchgear
Committee
,
an
organization
of
both
users
and
manufactures
,
recognized
the
need
for
a
common
trouble
reporting
format
.
A
reproducible
copy
of
this
form
is
included
inside
the
rear
cover
of
this
book
and
is
recom
-
mended
for
use
with
any
manufacturer
’
s
circuit
breakers
,
The
Intent
is
for
each
maintenance
organization
to
keep
specific
problem
files
with
this
information
documented
.
If
the
problem
is
serious
or
repetitive
,
a
summary
should
be
sent
to
the
appropriate
MANUFACTURER
for
action
,
The
level
of
detail
included
on
the
form
is
considered
very
desirable
so
that
the
manufacturer
’
s
investigator
may
more
thoroughly
understand
and
solve
the
reporled
problem
.
•.
7
'
Cy
11.4
.
CONTACT
EROSION
Check
in
the
breaker
-
closed
position
per
PRIMARY
CONTACT
EROSION
section
8.1
.
When
erosion
reaches
1
/
8
inch
,
the
interrupter
should
be
replaced
.
Ip
•
JI
.
11.2
.
SERVICE
CONDITIONS
The
frequency
of
required
maintenance
depends
on
the
severity
of
the
service
conditions
of
the
switchgear
applica
-
tion
.
If
the
service
conditions
are
mild
,
the
interval
between
maintenance
operations
may
be
extended
to
10
years
or
10
,
000
no
load
or
normal
load
switching
operations
.
Mild
service
conditions
are
defined
as
an
environment
in
which
the
switchgear
is
protected
from
the
deleterious
effects
of
condi
-
tions
such
as
:
11.5
.
TRANSFER
FINGER
WEAR
With
the
breaker
open
,
examine
the
moving
contact
rod
projecting
below
the
transfer
fillers
(
10
,
Fig
.
8
)
.
Wipe
off
the
lubricant
in
order
to
see
the
metal
surface
condition
.
The
finger
locations
should
present
a
burnished
silver
contact
without
copper
appearance
at
more
than
one
location
,
If
copper
is
visible
at
more
than
one
location
per
pole
or
the
silver
plating
is
torn
,
the
interrupter
assembly
should
B
^
replaced
.
Relubricate
with
0282
A
2048
P
009
.
^
9
Courtesy of NationalSwitchgear.com

11.6
.
MECHANISM
Check
all
items
covered
in
INSTALLATION
and
readjust
or
tighten
hardware
as
required
.
Lubricate
as
recommended
under
LUBRICATION
.
3
Silvered
primary
contact
surfaces
such
as
the
movable
contact
rod
of
the
interrupter
and
the
primary
disconnect
fingers
should
be
wiped
clean
and
lightly
coated
with
0282
A
2048
P
009
.
Pins
of
the
secondary
disconnect
coupler
should
be
cleaned
and
lightly
coated
with
0282
A
2048
P
009
,
i
.
•
j
11
,
7
.
PRIMARY
INSULATION
PARTS
Using
dry
non
-
linting
cloth
or
industrial
-
type
wipers
,
clean
accessible
insulation
surfaces
on
the
interrupter
supports
and
operating
rod
insulators
.
In
service
locations
where
contami
-
nation
is
heavy
or
external
flashovers
have
occurred
during
interrupter
high
-
potential
testing
,
remove
the
interrupter
assemblies
per
the
procedure
in
REPAIR
AND
REPLACE
-
MENT
and
clean
the
inside
surfaces
of
the
interrupter
supports
and
the
outer
insulation
surfaces
of
the
POWER
/
ACAinterrupters
,
Be
sure
to
discharge
the
interrupter
mid
-
band
ring
before
removing
the
interrupter
assemblies
,
Re
-
moval
and
reassembly
of
interrupter
assemblies
will
normally
not
require
adjustment
due
to
the
design
of
the
interrupter
operating
rod
insulator
connection
,
They
should
be
returned
to
the
same
location
from
which
they
were
removed
.
11
,
9
.
RECOMMENDED
MAINTENANCE
The
following
operations
should
be
performed
at
each
maintenance
check
:
1
.
Perform
a
visual
inspection
of
the
breaker
.
Check
for
loose
or
damaged
parts
.
2
.
Perform
slow
closing
operation
described
under
MECHA
-
NICAL
CHECKING
AND
SLOW
CLOSING
,
3
.
Check
the
erosion
indicator
and
the
wipe
and
gap
as
described
under
DIMENSIONAL
CHECKS
.
4
.
Perform
the
vacuum
interrupter
integrity
test
as
de
-
scribed
under
ELECTRICAL
CHECKS
.
5
.
Lubricate
the
breaker
operating
mechanism
as
described
under
LUBRICATION
.
6
.
Check
the
electrical
operation
Using
the
test
cabinet
(
if
available
)
or
the
test
position
in
the
metalclad
switchgear
.
CA
UTION
REPEATED
OPERATIONS
AT
A
RATE
EX
-
CEEDING
TWO
PER
MINUTE
WILL
CAUSE
CHARG
-
ING
MOTOR
OVERHEATING
AND
SUBSEQUENT
MOTOR
FAILURE
.
7
.
Examine
the
movable
contact
rod
of
the
vacuum
interrupter
,
With
the
breaker
open
,
wipe
the
lubricant
off
the
rod
and
examine
the
silver
surface
.
The
rod
should
have
a
burnished
appearance
without
copper
appearing
through
the
silver
.
If
copper
is
visible
at
more
than
one
location
per
pole
,
or
if
the
silver
plating
is
torn
,
the
interrupter
assembly
should
be
replaced
,
Relubricate
movable
contact
rod
with
0282
A
2048
P
009
grease
.
8
.
If
desired
,
perform
the
additional
electrical
tests
(
Megger
,
Primary
and
Secondary
High
Potential
,
and
Primary
Circuit
Resistance
)
.
See
ELECTRICAL
CHECKS
11
,
8
.
LUBRICATION
Proper
lubrication
is
important
for
maintaining
reliable
circuit
breaker
performance
.
The
ML
-
18
mechanism
uses
sarihgs
which
have
a
synthetic
lining
in
some
locations
,
mese
bearings
do
not
require
lubrication
to
maintain
low
friction
,
but
lubrication
does
not
harm
them
and
oiling
lightly
is
recommended
.
Sleeve
bearings
are
used
in
some
linkage
locations
and
needle
or
roller
bearings
are
used
for
low
friction
on
trip
shaft
and
close
shaft
,
Bearings
are
lubricated
during
factory
assembly
with
grease
and
oil
,
but
all
lubricants
have
a
tendency
to
deterio
-
rate
with
age
.
Providing
a
fresh
lubricant
supply
at
periodic
intervals
is
essential
to
proper
breaker
operation
,
especially
where
frequent
operation
may
forced
lubricant
out
of
the
bearing
surfaces
.
Apply
a
few
jdrops
of
light
synthetic
machine
oil
such
as
Mobile
1
at
each
bearing
.
Apply
a
coat
of
0282
A
2048
P
009
grease
on
the
four
corners
of
the
closing
spring
guide
where
it
enters
inside
the
spring
.
.
.
Metal
-
to
-
metal
contact
surfaces
should
be
cleaned
and
lubricated
with
0282
A
2048
P
009
.
This
grease
is
available
packaged
in
a
pint
can
to
provide
cleanliness
and
prevent
oxidation
.
Electrical
primary
contact
surfaces
also
require
periodic
lubrication
to
inhibit
oxidation
and
minimize
friction
.
At
each
inspection
and
maintenance
interval
,
do
the
following
:
!
•
•
;
>
V
-
-
S
-
t
•
'
-
.
TV
12
.
TIMING
Timing
and
speed
checks
are
optional
and
also
depend
on
the
level
of
maintenance
performed
,
Generally
these
tests
are
not
required
for
normal
maintenance
,
If
a
new
mechanism
has
been
installed
or
extensive
repair
,
replacement
or
major
disassembly
has
been
performed
,
it
is
recommended
that
these
tests
be
performed
.
•
v
.
J
10
Courtesy of NationalSwitchgear.com

Refer
as
needed
to
sections
on
mechanical
and
electrical
adjustments
.
/
.
;
To
determine
contact
velocity
,
a
travel
recorder
and
oscillograph
are
required
.
Optional
travel
recorders
can
be
obtained
through
your
local
GE
Sales
Office
by
ordering
part
number
0144
D
123
SG
001
.
A
typical
travel
trace
and
inter
-
pretation
are
shown
in
Fig
.
18
.
Timing
may
be checked
by
monitoring
control
circuit
voltage
and
using
no
more
than
six volts
DC
and
one
ampere
through
the
vacuum
interrupter
contact
to
indicate
closed
or
open
condition
.
Typical
time
ranges
vary
with
coil
voltage
,
but
nominal
values
are :
Initiation
of
trip
signal
to
contact
parting
32
-
45
Milliseconds
2
Milliseconds maximum
pole spread
Initiation
of
close
signal
to
contact
closing
35
*
75
Milliseconds
2
Milliseconds maximum
pole
spread
.
Trip
-
free
operation
may
be
checked
by
applying
a
simul
-
taneous
close
and
trip
signal
,
and
a
minimum
reclose
opera
-
tion
may
be
checked
by
tripping
a
charged
breaker
open
while
maintaining
a
close
signal
.
Instantaneous
reclose
time
*
85
-
150
Milliseconds
.
Time
from
application
of
trip
signal
until
breaker
contacts
reclose
.
14
,
2
.
REPLACEMENT
OF
INTERRUPTER
ASSEMBLIES
Interrupters
are
supplied
in
complete
interrupter
assem
-
blies
which
include
the
vacuum
interrupter
mounted
in
the
interrupter
support
,
the
primary
studs
and
disconnect
fingers
.
CAUTION
:
DO
NOT
ATTEMPT
TO
REMOVE
OR
RE
-
*
INSERTTHE
VACUUM
INTERRUPTER
IN
THE
INTER
-
RUPTER
SUPPORT
ASSEMBLY
,
SPECIAL TOOLS
AV
-
AILABLE
ONLY
AT
THE
FACTORY
ARE
REQUIRED
,
1
.
Close
the
breaker
and
remove
the
coupling
clamp
,
(
8
,
Fig
,
8
)
.
Hold
hex
projection
(
6
,
Fig
,
8
)
at
the
bottom
of
the
operating
rod
insulator
with
a
one
inch wrench
and
loosen
the
adjacent
lock
nut
with
a
3
/
4
inch
wrench
.
Screw
down
the
lock
nut
and
the
operating
rod
insulator
until
clear
of
<
L
-
interrupter
rod
.
Remove
the
four
bolts
holding
the
poie
assembly
to
the
mechanism
and
remove
the
old
pote
,
,
assembly
.
2
.
Set
the
new
pole
assembly
in
place
and
install
the
four
mounting
bolts
.
Set
the
pole
assembly
so
that
the
distance
between
the
primary
studs
and
the
studs
on
the
adjacent
pole
are
ten
(
10
)
inohes
center
line
to
center
line
.
13
.
OPENING
AND
CLOSING
SPEED
The
opening
speed
is
modified
by
moving
the
speed
adjusting
nuts
on
the
opening
spring
assemblies
,
A
change
in
the
opening
speed
affects
the
closing
speed
.
Reference
Figure
3
,
Screw
the
operating
rod
insulator
up
to
mate
with
the
base
of
the
interrupter
rod
.
Install
coupling
clamp
.
Tighten
coupling
clamp
capscrews
,
then
loosen
them
1
-
2
tums
>
*
;
f
$
fgLr
a
.
With
continuity
indicator
across
the
contacts
,
back
off
the
operating
rod until the
contacts
separate
,
(
continuity
:
’
indicator
off
)
.
• •
b
.
Advance
operating
rod
until
contacts
touch
,
(
conti
-
16
.
The
operating
speeds
are
as
follows
:
Operation
Feet Per
Second
nuity
indicator
on
)
,
c
.
Advance
operating
rod
two
and
one
-
half
(
2
l
/
2
)
c
additional
turns
.
Open
Close
5.0
nominal
,
4
,
5
minimum
3.5
"
rtominal
,
4.0
maximum
d
.
Tighten
lock
nut
to
40
-
50
foot
pounds
and
the
coupling
clamp
capscrews
to
8
-
10
foot
pounds
e
.
Check
wipe
-
must
be
.
155
-
.
180
inch
(
set
all
three
phases
before
measuring
)
.
It
is
not
necessary
that
all
three
poles
have
the
same
wipe
measurement
as
long
as
all
three
poles
fall
within
the
specified
limits
.
f
.
Check
gap
-
must
be
.
545
-
.
600
inch
.
Adjust
if
needed
,
r
;
,
per
CONTACT
GAP
ADJUSTMENT
in
MECHANICAL
ADJUSTMENT
section
.
v
14
.
REPAIR
AND
REPLACEMENT
14.1
.
GENERAL
The
following
information
covers
in
detail
the
proper
method
of
removing
various
parts
of
the
breaker
in
order
to
make
any
necessary
repairs
.
This
section
includes
only
those
repairs
that
can
be
made
at
the
installation
site
on
parts
of
the
breaker
that
are
most
subject
to
damage
.
Important
:
Upon
completion
of
any
kind
of
repair
work
,
all
Interrupter
and
mechanism
adjustments
must
be
checked
.
4
.
If
new
interrupter
assembly
is
installed
,
check
and
adjust
the
erosion
indicator
(
4
,
Fig
,
7
)
by
bending
the
indicator
to
line
up
with
erosion
disk
.
:
/
\
l l
Courtesy of NationalSwitchgear.com

K
:
>
5
.
Perform
the
VACUUM
INTERRUPTER
INTEGRITY
TEST
as
described
in
ELECTRICAL
CHECKS
section
.
CAUTION
PRIMARY
DISCONNECT
WIPE
CAN
ONLY
BE
CHECKED
WHEN
THE
SWITCHGEAR
IS
DEENERGIZED
.
3
.
Pump
the
manual
close
handle
3
-
4
times
.
4
.
With
the
5
/
16
”
Allen
wrench
,
remove
the
pivot
bolt
(
10
,
Fig
.
!
5
)
on
the
closing
spring
(
1
,
Fig
.
15
)
.
5
.
Remove
the
closing
spring
.
6
.
Disconnect
the
trip
linkage
tension
spring
.
7
.
Loosen
the
interlock
bracket
(
11
,
Fig
.
15
)
.
8
.
Remove
the
4
bolts
from
the
coil
bracket
leaving
the
two
bolts
nearest
the
front
of
the
breaker
in
place
in
the
mechanism
frame
.
9
.
Cut
coil
leads and
remove
the
coil
and
armature
.
To
install
the
new
coil
,
reverse
the
above
procedure
and
connect
leads
with
insulated
butt
connectors
.
See
TRIP
COIL
PLUNGER
in
MECHANICAL
ADJUSTMENTS
section
for
setting
the
stroke
of
the
armature
.
Apply
Loctite
to
the
threads
of
the
pivot
bolt
(
10
,
Fig
.
15
)
when
it
is
replaced
.
Charge
the breaker
and
electrically
close
and
trip
it
to
make
certain
it
has
been
reassembled
correctly
.
14.3
.
PRIMARY
DISCONNECT
FINGERS
The
primary
disconnect
finger
assemblies
can
be
removed
by
removing
two
roll
pins
which
hold
them
in
place
on
the
primary
studs
.
Finger
contact
surfaces
should
be
coated
with
0282
A
2048
P
009
lubricant
.
14.4
.
MECHANISM
'
'
'
Pin
Retaining
Rings
-
These
rings
are
widely
used
in
the
>
?
ML
»
18
mechanism
to
retain
pins
.
They
can
be
installed
and
.
removed
with
a
pair
of
standard
pliers
.
Reuse
is
not
recom
-
‘
/
mended
.
To
remove
,
slowly
squeeze
the
removal
ears
while
ppulling
.
To
install
,
position
in
the
pin
groove
and
squeeze
the
•
7
Installation
ears
closed
leaving
no
more
than
1
/
16
inch
gap
:
between
ears
,
Retaining rings
can
be obtained
from
your
local
GE
Sales
office
by
ordering
part
number
0282
A
2015
G
001
.
14.7
.
CLOSING
COIL
REPLACEMENT
Disconnect
the
close
linkage
tension
spring
then
remove
the
retaining
ring
from
the
close
linkage
pivot
pin
(
17
,
Fig
,
15
)
and
disconnect
the
linkage
,
Remove
the
closing
coil
and
housing
(
6
,
Fig
.
15
)
.
Cut
the
leads
to
the
closing
coll
and
remove
the
coil
.
Reassemble the coil
and
housing
with
arma
-
ture
and
butt
-
splice
the
new
coil into
the
wiring
harness
.
Reassemble
linkage
and
spring
.
Readjust
the
closing
coil
armature
travel
in
accordance
with
instructions
in
MECHAN
-
ICAL
ADJUSTMENTS
section
under
CLOSE
COIL
PLUNGER
,
14.5
.
CONTROL
SWITCHES
Control
switches
may
be
removed
from
their
mounting
brackets
by
disconnecting
the
wires
and
removing
the
mount
-
ing
hardware
.
When
replacing
the
switches
,
check
that
the
correct
type
,
normally
open
or
normally
closed
,
is
used
.
Reinstall
,
wire
and
adjust
per
DIMENSIONAL
CHECKS
CONTROL
SWITCH
ADJUSTMENT
.
14.8
,
AUXILIARY
SWITCH
REPLACEMENT
With
the
breaker
open
and
the
closing
spring discharged
,
remove
retaining
clip
from
auxiliary
switch
shaft
,
or
loosen
clamping
bolt
in
operating
link
.
Observe
and
make
note
of
the
direction
of
the
index
mark
on
the
end
of
the
shaft
.
Remove
mounting
hardware
securing
auxiliary
switch
to
mechanism
plate
.
Slide
auxiliary
switch
and
shaft
out
of
operating
link
.
Before
removing
any
wires
from
switch
terminals
,
make
sure
they
are
properly tagged
with
switch
terminal
numbers
to
assure
proper
placement
on
new
switch
.
Remove
wires
,
To
install
new
switch
,
attach
leads
then
install
switch
,
or
install
switch
then
attach
leads
depending
upon
type
of
switch
and
its
terminal
accessibility
.
Install
switch
shaft
in
operating
link
with
index
mark
aligned
as
noted
above
,
Reverse
above
procedure
to
complete
installation
.
~
V
.
i
;
>
'
'
14.6
.
TRIP
COIL
REPLACEMENT
TOOLS
REQUIRED
5
/
16
"
Allen
wrench
Needle
nose
pliers
7
/
16
"
Socket
wrench
7
/
16
”
Box
/
combination
wrench
-
1
/
4
”
Square
drive
ratchet
1
/
4
”
Square
3
”
extension
Loctite
#
271
or
equivalent
V
>
’
.
,
-
i
1
•
Perform
the
operation
in
the
following
sequence
:
1
.
Charge
closing spring
and
install
gag
plate
,
2
.
Depress
the close
and
then
the
trip
buttons
,
T
V
,
|
‘
_
12
Courtesy of NationalSwitchgear.com

16
.
MECHANICAL
ADJUSTMENTS
16.1
.
GENERAL
The
ML
-
18
Mechanism
has
been
designed
for
extended
intervals
between
maintenance
.
In
most
cases
only
the
wipe
and
gap
adjustments
will
require
re
-
setting
throughout
the
life
of
the
circuit
breaker
.
14
,
9
.
MOTOR
REPLACEMENT
With
the
breaker
open
and
the
closing
spring
discharged
,
remove
auxiliary
switch
as
described
above
but
do
not
disconnect
leads
.
Move
switch
toward
side
of
mechanism
far
enough
to
clear
motor
and
tie
there
temporarily
,
Disconnect
motor
leads
and
remove
the
“
C
"
ring
retaining
the
charge
linkage
arms
to
the
motor
output
shaft
.
Remove
the
long
bolt
and
spacer
securing
the
motor
to
the
mechanism
mid
-
plate
.
Remove
the
two
socket
head
cap
screws
securing
the
motor
to
the
mechanism
top
plate
,
Disengage
the
motor
output
shaft
from
the
charge
linkage
arms
and
withdraw
motor
.
To
install
the
new
motor
,
reverse
the
above
procedure
.
14.10
.
“
Y
”
RELAY
REPLACEMENT
Before
removing
the
“
Y
”
relay
,
make
sure
all
leads
are
marked
with
terminal
locations
.
Next
,
disconnect
all
leads
and
remove
the
two
fasteners
securing
the
“
Y
”
relay
’
s
shock
absorbing
mounting
bracket
to
the
mechanism
rear
plate
.
Withdraw
relay
and
bracket
.
Remove
fasteners
securing
relay
to
mounting
bracket
.
Reverse
above
procedure
to
install
new
relay
.
15
.
RENEWAL
PARTS
It
is
recommended
that
sufficient
renewal
parts
be
carried
in
stock
to
enable
the
prompt
replacement
of
any
worn
,
broken
or
damaged
parts
.
A
stock
of
such
parts
minimizes
service
interruptions
caused
by
breakdowns
,
and
saves
time
and
expense
.
When
continuous
operation
is
a
primary
consid
-
eration
,
more
renewal
parts
should
be
carried
,
the
amount
depending
upon
the
severity
of
the
service
and
the
time
required
to
secure
replacements
.
Renewal
parts
which
are
furnished
may
not
be
identical
to
the
original
parts
,
but
they
will
be
interchangeable
.
A
separate
Renewal
Parts
Bulletin
is
available
from
your
local
GE
Sales
office
by
asking
for
GEK
90218
.
15.1
.
ORDERING
'
INSTRUCTIONS
1
.
Always
specify
the
complete
nameplate
data
of
both
the
breaker
and
the
mechanism
.
2
.
Specify
the
quantity
,
catalog
number
(
if
listed
)
,
reference
number
(
if
listed
)
,
and
description
of
each
part
ordered
,
and
the
parts
bulletin
number
.
3
.
Standard
hardware
,
such
as
screws
,
bolts
,
nuts
,
washers
,
etc
.
is
not
listed
in
this
bulletin
.
Such
items
should
be
purchased
locally
.
4
.
For
prices
or
information
on
parts
not
listed
in
the
Renewal
Parts
Bulletin
,
refer
to
the
nearest
GE
office
,
:
16.2
.
WIPE
ADJUSTMENT
Wipe
is
the
additional
compression
of
a
preloaded
spring
,
used
to
apply
force
to
the
vacuum
interrupter
contacts
and
to
provide
opening
kick
-
off
force
.
An
indicator
is
provided
on
the
wipe
spring
assembly
with
graduations
given
in
0.050
inch
on
which
the
wipe
is
indicated
directly
.
See
Figure
8
.
Improvement
in
the
accuracy
of
the
wipe
measurement
may
be
obtained
by
using
a
feeler
gauge
between
the
top
of
the
wipe
indicator
and
the
erosion
disk
.
The
difference
in
readings
recorded
on
each
pole
with
the
breaker
closed
and
open
will
be
the
contact
wipe
.
After
adjustment
the
wipe
should
be
0.155
-
0.180
inch
.
To
adjust
the
primary
contact
wipe
,
close
the
breaker
and
proceed
as
follows
:
1
.
Loosen
but
do
not
remove
the
two
screws
(
9
,
Fig
.
8
)
holding
the
interrupter
clamp
.
2
.
Check
that
the
interrupter
clamp
is
loose
,
A
light
pry
at
the
clamp
half
-
junction
may
be
required
to
loosen
the
wedging
action
of
the
clamp
.
:
.
,
t
3
.
Hold
the
hexagon
projection
(
6
,
Flg
.
8
)
at
the
bottom
of
the
operating
rod
insulator
(
1
inch
wrench
)
and
loosen
the
adjacent
locknut
(
3
/
4
inch
wrench
)
.
Refer
to
(
4
,
Fig
.
8
)
,
Adjust
by
rotating
the
operating
rod
insulator
.
The
thread
is
1
/
<
2
*
13
and
each
turn
will
give
about
0
,
078
inch
change
in
prittfary
wipe
.
Screw
the
operating
rod
insulator
toward
the
inter
-
rupter
to
increase
wipe
.
4
.
After
setting
the
contact
wipes
on
each
phase
,
torque
the
operating
rod
locknut
(
9
,
Fig
.
8
)
to
40
-
50
foot
pounds
while
preventing
the
operating
rod
insulator
(
7
)
from
turning
.
Tighten
the
clamp
screws
(
6
)
to
8
-
10
foot
pounds
and
trip
the
breaker
open
.
This
procedure
prevents
accidental
twisting
of
the
interrupter
’
s
operating
rod
by
loading
the
contaOts
with
the
wipe
springs
and
forcing
relative
rotation
to
occur
at
the
clamp
interface
.
After
adjustment
,
remeasure
the
wipe
dimensions
,
If
the
wipe
settings
are
within
the
required
limits
,
there
is
an
adequate
contact
closing
relationship
between
the
poles
.
13
Courtesy of NationalSwitchgear.com

16.3
.
CONTACT
GAP
ADJUSTMENT
The
gap
adjustment
refers
to
the
separation
,
or
gap
,
between
the
primary
contacts
within
the
vacuum
interrupter
.
Before
attempting
to
measure
or
set
the
gap
adjustment
,
verify
that
the
wipe
settings
are
within
acceptable
limits
.
Any
change
of
the
wipe
settings
will
affect
the
gap
settings
.
1
.
With
the
breaker
in
the
open
position
and
the
closing
spring
discharged
,
locate
the
gap
adjusting
nuts
on
the
opening
spring
rods
connected
to
the
outer
phase
bell
cranks
(
Fig
.
16
)
.
Loosen
the
jam
nut
on
both
rods
.
Back
off
the
adjusting
bolt
on
the
center
phase
VI
stop
(
Fig
.
16
)
.
Advance
or
retard
the
adjusting
nuts
depending
on
which
way
you
want
to
change
the
gap
.
Move
both
nuts
the
same
amount
.
3
.
.
Lock
the
jam
nuts
after
setting
the
adjusting
nuts
.
Operate
.
the
breaker
a
few
times
and
remeasure
the
gap
following
the
procedure
described
in
DIMENSIONAL
CHECKS
,
item
3
.
16
,
6
.
CLOSE
LATCH
STOP
BOLT
SHOULD
NOT
BE
ROUTINELY
ADJUSTED
-
WILL
AFFECT
SPRING
DISCHARGE
INTERLOCK
SETTING
.
This
adjustment
is
shown
in
Figure
L
and
is
obtained
with
the
breaker
in
the
open
position
and
the
closing
spring
charged
.
The
setting
is
checked
by
advancing
the
adjusting
screw
until
the
breaker
closes
.
Back
adjusting
screw
off
1
/
2
turn
(
3
flats
)
.
Check
function
by
opening
the
breaker
and
charging
the
closing
spring
.
If
the
latch
slips
off
the
roller
and
the
breaker
closes
,
back
the
adjusting
screw
off
1
additional
flat
.
Check
function
.
16.7
,
SPRING
DISCHARGE
INTERLOCK
THIS
INTERLOCK
IS
FACTORY
SET
AND
SHOULD
NOT
BE
ROUTINELY
ADJUSTED
IN
THE
FIELD
.
The
adjustment
for
this
interlock
is
as
follows
.
(
See
Fig
.
17
)
.
The
breaker
should
be
open
with
the
closing
spring
charged
.
1
.
Back
off
1
/
4
inch
adjusting
screw
.
2
.
While
holding
roller
at
0.995
inch
dim
,
,
advance
adjusting
screw
to
just
touch
interlock
lever
.
3
.
Check
that
spring
discharges
with
roller
at
0.561
inchmin
,
dim
.
4
.
Close
latch
must
reset
as
indicated
.
16.8
.
NEGATIVE
INTERLOCK
THIS
INTERLOCK
IS
FACTORY
-
SET
AND
SHOULD
NOT
BE
ROUTINELY
ADJUSTED
IN
THE
FIELD
.
The
negative
interlock
is
adjusted
with
the
breaker
closed
and
the
closing
spring
discharged
.
(
See
Fig
.
20
)
.
1
.
Hold
roller
at
0
,
670
inch
from
mechanism
side
plate
.
Adjust
linkage
so
the
striker
just
makes
contact
with
trip
linkage
.
2
.
Lock
in
place
with
1
/
4
inch
hardware
and
rivet
.
3
.
Check
that
breaker
trips
with
roller
at
0.561
inchmin
.
dim
.
4
.
Check
that
linkage
moves
freely
.
2
.
4
,
Readjust
the
center
phase
VI
stop
(
Figure
16
)
,
Set
adjust
-
ing
screw
for
no
clearance
between
stop
and
wipe
spring
rod
striker
with
the
breaker
open
.
.
v
,
16.4
.
TRIP
COIL
PLUNGER
;
(
To
adjust
trip
coil
plunger
gap
(
Figure
T
)
,
lift
locktab
away
from
adjusting
nut
.
Turn
adjusting
nut
until
trip
pin
makes
contact
with
trip
arm
while
maintaining
dim
,
T
.
Bend
locktab
"
to
secure
adjusting
nut
.
.
<
'
%
.
.
*
Reference
DIMENSIONAL
CHECKS
for
breaker
posi
-
tion
and
spring
status
.
16.5
.
CLOSsE
COIL
PLUNGER
j
,
To
adjust
close
coil
plunger
gap
(
Figure
C
)
,
lift
locktab
away
from
adjusting
nut
.
Turn
adjusting
nut
until
close
latch
actuator
makes
contact
with
close
latch
while
maintaining
dim
.
C
.
Bend
locktab
to
secure
adjusting
nut
,
Reference
DIMENSIONAL
%
ECK
»
for
breaker
posi
-
tion
and
spring
status
.
ftifr
i
f
.
•
.
MV
-
•
f
’
-
vtl
-
.•
r
.
14
Courtesy of NationalSwitchgear.com

FIGURE
1
RATING
INTERFERENCE
PLATE
'
M
1
\
•
V
•
86132
B
-
2
1
.
Rating
Interference
Plate
2
,
Lifting
Locations
(
3
/
4
”
dia
.
hole
at
all
four
corners
)
;
.
v
,
t
f
;
\
15
Courtesy of NationalSwitchgear.com

FIGURE
2
FRONT
VIEW
OF
POWER
/
VAC
*
BREAKER
WITH
FRONT
COVER
!
10
PUU
fOP
OP
BOTtOM
toot
01
MIONI
PANfl
*
86132
B
-
3
1
.
Front
cover
2
.
Cover
mounting
bolts
3
.
Manual
trip
button
4
.
Manual
close
button
5
.
Nameplate
6
.
Manual
charge
lever
7
.
Counter
8
.
Spring
charge
indication
9
.
Closing
spring
gag
access
10
.
Open
/
Close
indicator
FIGURE
3
FRONT
VIEW
OF
POWER
/
VAC
*
BREAKER
WITHOUT
FRONT
COVER
.
86132
B
-
4
1
.
Upper
interrupter
connection
2
.
Interrupter
support
3
.
Operating
rod
4
.
Racking
arm
5
.
Compartment
track
rollers
6
.
Manual
trip
button
7
.
Open
/
Close
indicator
8
.
Counter
9
,
Spring
charge
indicator
10
Manual
charge
lever
11
.
Manual
close
button
12
.
Handle
to
connect
secondary
disconnects
in
test
position
13
.
Closing
spring
gag
access
v
;
.
.
.
-
.
y
16
Courtesy of NationalSwitchgear.com