BBC 7.5HK500 Installation and operating instructions

IB
6
,
2.2
.
7
C
BBC
Installation
/
Maintenance
Instructions
BROWN
BOVERi
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Medium
-
Voltage
Power
Circuit
Breakers
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i
Type
7.5
HK
500
,
15
HK
500
and
15
HK
750
1200
thru
3000
Amperes
7500
and
15000
Volts
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Courtesy of NationalSwitchgear.com

IB
6.2
.
2.71
Page
2
TABLE
OF
CONTENTS
Section
1
INTRODUCTION
2
RECEIVING
AND
STORAGE
3
CIRCUIT
BREAKER
INSTALLATION
3.1
General
3.2
Installation
Inspection
3.3
Removing
Interphase
Barriers
3.4
Removing
Arc
Chutes
3.5
Arc
Chute
Examination
3.6
Insulation
Structure
3.7
Manual
Slow
-
Close
to
Check Contract
Pressure
3.8
Installing
Arc
Chutes
3.9
Installing
Interphase
Barriers
3.10
Installing
Circuit
Breaker
into
Compartment
.
.
4
CIRCUIT
BREAKER
REMOVAL
4.1
Removal
From
"
CONNECTED
"
Position
. . . .
4.2
"
DISCONNECT
"
Position
4.3
Removal
From
Switchboard
4.4
Safe
Operation
Recommendations
5
MAINTENANCE
AND
ADJUSTMENTS
5.1
General
Information
5.2
Contact
Pressure
5.3
Contact
and
Insulation
Cleaning
5.4
Millivolt
Drop
Test
5.5
Puffers
5.6
Bridge
Pivot
Pressure
5.7
Closing
and
Opening
Times
5.8
Arc
Chutes
5.9
Operating
Mechanism
5.10
Control
Relay Adjustment
5.11
Racking
Mechanism
5.12
Lubrication
5.13
Dielectric
Tests
5.14
Troubleshooting
5.15
Electrical
Characteristics
of
Control
Devices
.
.
Page
3
3
3
3
4
4
4
4
4
4
5
5
5
6
6
6
6
6
6
f
6
*
7
7
8
8
8
8
9
9
9
10
10
10
11
11
6
ELECTRICAL
OPERATING
SEQUENCE
11
7
GROUND
AND
TEST
DEVICES
8
RENEWAL
PARTS
13
13
f
f
i
(
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Courtesy of NationalSwitchgear.com

!
IB
6
2.2
.
7
1
Page
3
.
i
t
?
INSTRUCTIONS
FOR
7.5
AND
15
KV
POWER
CIRCUIT
BREAKERS
TYPE
7.5
HK
500
15
HK
500
AND
750
going
into
service
to
insure
that
it
is
without
damage
and
it
has
not
become
generally
contam
-
inated
.
Section
1
.
INTRODUCTION
These
instructions
for
installation
,
operation
and
maintenance
of
HK
circuit
breakers
should
be
read
carefully
and
used
as
a
guide
during
installation
and
initial
operation
.
The
specific
ratings
of
each
model
circuit
breaker
are
listed
on
the
individual
nameplates
.
File
these
instructions
in
a
readily
accessible
place
together
with
drawings
and
uescriptive
data
of
the
switchgear
.
These
instructions
are
guides
to
proper
maintenance
of
the
equipment
and
prolong
its
life
and
usefulness
.
Section
3
.
CIRCUIT
BREAKER
INSTALLATION
3.1
GENERAL
Prior
to
installation
of
the
circuit
breaker
into
a
switchboard
,
certain
preliminary
inspections
am
made
to
insure
proper
operation
.
CAUTION
CAUTION
CAUTION
CAUT
.
ON
&
PRIOR
TO
ANY
DISASSEMBLY
OR
INSPECTION
Of
THE
CIRCUIT
BREAKER
THE
CLOSING
SPRINGS
SHOULD
BE
DISCHARGED
AND
rHE
BREAKER
SHOULD
BE
OPEN
IF
IT
IS
NECESSARY
TO
RAISE
OR
MOVE
THE
BREAKER
,
ATTACH
THE
LIFTING
YOKE
AT
POINTS
7
{
FIGURE
11
,
OR
A
FIFTH
WHEEL
AT
POINT
5
(
FIGURE
2
)
TO
TRANSPORT
THE
BREAKER
AS
REQUIRED
.
Section
2
.
RECEIVING
AND
STORAGE
Immediately
upon
receipt
of
the
circuit
breakers
,
ex
-
amine
the
cartons
to
determine
if
any
damage
or
loss
was
sustained
during
transit
.
If
injury
or
rough
handling
is
evident
,
file
a
damage
claim
at
once
with
the
carrier
and
promptly
notify
the
nearest
District
Office
.
The
company
is
not
responsible
for
damage
of
goods
after
delivery
to
the
carrier
.
However
,
we
will
lend
assistance
if
notified
of
claims
.
Unpack
circuit
breakers
as
soon
as
possible
after
re
-
ceipt
.
If
unpacking
is
delayed
,
difficulty
may
be
ex
-
perienced
in
making
a
claim
for
damages
not
evident
upon
receipt
.
Use
care
in
unpacking
in
order
to
avoid
damaging
any
circuit
breakers
parts
.
Check
the
contents
of
each
carton
against
the
packing
list
before
discarding
any
packing
material
.
If
any
discrepancy
is
discovered
,
promptly
notify
the
nearest
district
office
.
Information
specifying
the
purchase
order
number
,
carton
number
and
part
numbers
of
damaged
oi
missing
parts
should
accompany
the
claim
.
Circuit
breakers
should
be
installed
in
their
per
-
manent
location
as
soon
as
possible
.
If
the
breakers
are
not
to
be
placed
in
service
for
some
time
,
it
is
required
that
adequate
means
of
protection
be
pro
-
vided
.
This
may
be
done
by
keeping
the
breaker
in
its
original
shipping
carton
and
storing
in
a
warm
(
approximately
15
°
C
)
dry
(
50
%
max
humidity
)
and
uncontaminated
atmosphere
.
If
the
circuit
breaker
cannot
be
stored
properly
due
to
abnormal
circum
-
stances
,
it
must
be
thoroughly
checked
before
Fig
.
1
—
View
Showing
Arc
Chute
and
Contact
Structure
Inal
rue
vasts
do
not
pur
purr
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Courtesy of NationalSwitchgear.com

IB
6.2
.
2.7
-
1
Page
4
EjBIV
;
Vs
V
-
mmi
3.4
REMOVING
ARC
CHUTES
(
See
Figure
1
}
Remove
nut
(
12
)
and
gently
disconnect
return
connection
(
11
)
.
Remove bolt
(
8
)
connecting
the
front
leg
(
10
)
of
arc
chute
to
the
block
(
9
)
on
base
sheet
of
the
circuit
breaker
.
Attach
accessory
lifting
bracket
to
tie
bar
bushing
U
)
at
the
top
front
of
the
arc
chute and
slowly
raise
the
arc
chute
as
required
by
means
of
a
hoist
,
It
will
pivot
at
its terminal
connection
and
then
should
be
guided
straight
out
of
the
pivot
guide
slot
and
removed
away
from
the
circuit
breaker
.
If
only
a
visual examination
is
to
be
made
,
each
arc
chute
may
be
tilted
back
gently
,
hand
held
and
tilt
support
(
13
)
bolted
into
place
between
arc
chute
leg
(
10
)
and block
(
9
)
.
§
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3
4
5
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7
8
l
CAUTION CAUTION
CAUTION
CAUTION
Fig
.
2
—
Front
View
of
Control
Panel
BE
SURE
RETURN
CONNECTION
IS
CLEAR
AND
DOES NOT
CATCH
ON
THE
ARC
CHUTE
.
BLOCK
THE
WHEELS
TO
PREVENT
THE
BREAKER
FROM
ROLLING
.
3.5
ARC
CHUTE
EXAMINATION
Examine
arc
chutes
carefully
before
placing
into
service
.
Look
for
any
breakage
to
liner
plates
and
arc
chute
plates
.
Check
for
presence
of
any
foreign
particles
such
as
chips
of
ceramic and
metal
.
Inspect
exterior
for
any
damage
or
deformation
.
The
poly
-
ester
glass
moldings
occasionally
have
some
small
cracks
develop
in
resin
-
rich
areas
,
but
these
cracks
do
not
indicate
defective
material
and
should
not
cause
concern
.
3.2
INSTALLATION
INSPECTION
Inspect
condition
of
circuit
breaker
arc
chutes
,
contact
and
electrical
connections
prior
to
install
-
ing
the circuit breaker into
the
switchboard
.
Even
though
the circuit
breaker
is
completely adjusted
and
tested
at
the
factory
,
shipping
and
handling
conditions could
cause
defects
.
3.3
REMOVING
INTERPHASE BARRIERS
(
See
Figure
3
)
Remove
two
lower
front
sheet
screws
(
9
)
and
lift
front
sheet
up
and
away
from
the
breaker
.
Remove
arc
chute
tie bar
(
6
)
at
upper
front of
arc
chutes
.
Pivot
rear
brace
(
1
)
at
rear
of
each barrier
upward
,
and
slide
the
separate
barriers
(
3
)
forward
and
away
from
the
circuit
breaker
.
3.6
INSULATION
STRUCTURE
All
insulated
parts
should
be
checked
for
damage
.
Any
dust
or
dirt
should
be
removed
by
compressed
air
or
wiped
with
a
clean
,
lint
-
free
cloth
saturated
with
an
oil
-
free
solvent
.
This
is
important
because
the
soot
or
dirt
can
accumulate
and
,
with
moisture
,
place
the circuit breaker
in
jeopardy
,
dielectrically
.
The
lead
support
moldings
are
polyester
glass
and
occasionally
have
some
resin
-
rich
cracks
or
crazing
develop
,
but
these
do
not
indicate
defective
material
and
should
not
cause
concern
.
3.7
MANUAL
SLOW
-
CLOSE
TO
CHECK
CON
TACT
PRESSURE
(
Figure
2
}
NOTE
:
Insure
that accessories
that
affect
electrical
/
mechanical
operation
are
set
in
their
operating
posi
-
tions
:
i
.
e
.
,
undervoltage
devices
should
be
energized
or
mechanically
closed
;
mechanical
interlocks
,
key
or
other
,
should
be
properly
set
,
etc
.
1
.
Turn
racking
screw
clockwise
approximately
two
to
three
turns
until
the
racking
-
unlocking
lever
snaps
Into
the
first
position
corresponding
to
the
"
DISCONNECT
"
position
.
2
.
Engage
manual
charge
handle
(
8
)
with
charging
CAUTION
CAUTION CAUTION
CAUTfON
THE
BARRIERS
WILL
NOT
STAND
UNSUP
-
PORTED
AND
MUST
BE
BRACED
.
Fig
.
3
—
Method
of
Attaching
Barrier Assemblies
Courtesy of NationalSwitchgear.com

IB
6.2
.
2.7
-
1
Paqft
5
motion
is
felt
.
(
DO
NOT
FORCE
,
’
3
.
Engage
fifth
wheel
with
hole
guide
(
5
,
Figure
2
)
and
push
circuit
breaker
into
compartment
until
stopped
.
condition
,
they
will
automatically
discharge
.
)
4
.
Engage
racking
crank
and
rotate
clockwise
until
racking
mechanism
automatically
stops
at
“
DIS
-
CONNECT
"
position
.
(
Breaker
is
now
'
held
captive
in
compartment
,
)
lever
(
3
)
.
Pump
charging
lever
until
breaker
closing
springs
snap
into
charge
position
,
then
remove
handle
.
3
.
Insert
BOTH
tangs
of
spring
retainer
bracket
(
7
)
into
holes
of
closing
spring
guides
(
2
)
4
.
Pull
manual
close
lever
(
4
)
to
discharge
dosing
springs
onto
tangs
of
spring
retainer
bracket
(
7
)
.
At
this
time
the
contacts
will
partially
dose
.
5
.
Re
-
engage
manual
charge
handle
(
8
)
with
charging
lever
(
3
)
,
then
slowly
pump
to
slow
-
close
breaker
contacts
.
Check
contact
pressure
as
listed
tn
paragraph
5.2
.
Use
the
manual
trip
button
(
6
)
to
open
the
breaker
.
6
.
To
remove
spring
retainer
bracket
(
7
)
from
cir
-
cuit
breaker
,
continue
pumping
until
closing
springs
are
again
heard
to
snap
into
fully
-
charged
position
.
Spring
retainer
bracket
can
now
be
removed
.
7
.
Discharge
closing
springs
by
pulling
manual
close
lever
(
4
)
and
pushing
manual
trip
button
*
6
)
at
the
same
time
to
effect
trip
-
free
operation
.
(
The
breaker
can
be
closed
first
and
then
tripped
.
)
3.8
INSTALLING
ARC
CHUTES
(
See
Figure
1
)
(
If
closing
springs
were
left
in
charged
CAUTION
CAUTION CAUTION
CAUTION
BE
SURE
RETURN
CONNECTION
(
It
)
IS
CLEAR
AND
DOES
NOT
CATCH
ON
THE
ARC
CHUTE
.
Position
arc
chute
(
2
)
in
tilted
position
,
squarely
down
into
its
rear
pivot
guide
slots
and
fingers
(
3
)
(
avoid
bumping
and
chioping
of
all
moldings
)
,
then
lower
slowly
into
position
.
Securely
fasten
return
connection
by
nut
(
12
)
and
rebolt
front
arc
chute
support
leg
to
hold
-
down
block
.
3.9
INSTALLING
INTERPHASE
BARRIERS
(
See
Figure
3
)
1
.
Slide
the
right
and
left
interphase
barriers
(
3
.
»
as
marked
,
in
place
between
the
lead
support
mold
-
ings
and
inside
of
clips
on
the
outside
moldings
,
and
pivot
rear
brace
downward
behind
the
arc
chutes
.
2
.
Install
the
arc
chute
tie
bar
at
the
upper
front
on
the
arc
chutes
.
3
.
Lift
front
sheet
in
place
so
that
it
hooks
over
arc
chute
tie
baf
.
4
.
Secure
barrier
front
sheet
in
place
with
two
lower
front
sheet
screws
.
Fig
.
4
—
Method
of
Racking
Circuit
Breaker
i
5
.
To
rack
circuit
breaker
to
“
TEST
f
f
position
,
push
racking
unlocking
lever
(
3
.
Figure
4
)
to
left
,
rotate
racking
crank
approximately
1
'
4
turn
clock
-
wise
,
then
release
unlocking
lever
.
Continue
crank
-
ing
until
racking
mechanism
automatically
stops
at
"
TEST
"
position
.
6
.
With
the
circuit
breaker
racked
to
“
TEST
"
posi
-
tion
.
check
for
proper
operation
by
operating
all
possible
means
of
opening
and
closing
.
This
in
-
cludes
control
switches
,
relays
,
etc
.
Turn
motor
disconnect
switch
(
1
,
Figure
2
)
to
"
ON
"
position
to
charge
the
closing
springs
,
and
operate
the
breaker
as
required
.
It
motor
disconnect
switch
U
,
Figure
2
)
is
not
provided
,
springs
will
automatically
charge
when
approaching
"
TEST
"
position
.
FOR
SAFETY
:
When
racking
circuit
breaker
to
“
CONNECTED
"
position
,
close
compartment
door
(
1
.
Figure
4
)
and
insert
racking
crank
(
4
.
Figure
4
'
through
sliding
panel
(
2
,
Figure
4
)
.
7
,
Push
unlocking
lever
(
3
t
to
left
and
turn
racking
crank
(
4
)
approximately
1
/
4
turn
clockwise
,
then
release
unlocking
lever
.
Continue
cranking
until
racking
mechanism
automatically
stays
at
'
CON
-
NECTED
"
position
.
I
i
i
?
i
3.10
INSTALLING
CIRCUIT
BREAKER
INTO
COMPARTMENT
{
See
Figures
2
and
4
)
NOTE
:
CLOCKWISE
rotation
of
racking
crank
for
inserting
breaker
.
COUNTERCLOCKWISE
rota
tion
of
racking
crank
for
removal
of
breaker
.
1
.
Turn
motor
disconnect
switch
(
if
supplied
)
(
1
)
Figure
2
)
to
“
OFF
"
position
.
2
.
Engage
racking
crank
{
4
,
Figure
4
}
and
push
racking
unlocking
lever
(
31
to
left
,
then
rotate
rack
-
ing
crank
counterclockwise
only
until
resistance
to
The
circuit
breaker
may
now
be
put
in
service
and
be
operated
as
required
Courtesy of NationalSwitchgear.com

16
6.2
.
2.7
1
Page
6
Section
4
.
CIRCUIT
BREAKER
REMOVAL
(
See
Figure
41
l
4.1
REMOVAL
FROM
"
CONNECTED
”
POSITION
To
remove
circuit
breaker
from
"
CONNECTED
”
position
,
open
the
breaker
as
required
.
1
.
Open
sliding
door
(
2
)
in
front
compartment
door
(
1
)
.
2
.
Engage
racking
crank
(
4
)
and
push
racking
un
-
locking
lever
(
3
)
to
left
.
3
.
Rotate
racking
crank
(
4
)
counterclockwise
ap
-
proximately
1
/
4
turn
,
then
release
unlocking
lever
.
4
.
Continue
cranking
counterclockwise
until
rack
-
ing
mechanism
automatically
stops
at
"
TEST
”
position
.
4.2
"
DISCONNECT
"
POSITION
Repeat
same
operation
for
position
.
4.3
REMOVAL
FROM
SWITCHBOARD
To
position
the
racking
mechanism
for
withdrawal
of
the
circuit
breaker
from
the
switchboard
,
again
push
racking
unlocking
lever
to
the
left
and
turn
racking
crank
counterclockwise
only
until
resistance
to
motion
is
felt
.
(
Approximately
2
-
3
turns
—
DO
NOT
FORCE
.
)
The
circuit
breaker
can
now
be
removed
from
the
compartment
by
pulling
on
the
handle
located
at
the
bottom
of
the
front
barrier
.
NOTE
:
The
closing
springs
,
if
charged
,
will
auto
-
matically
discharge
when
the
circuit
breaker
is
with
-
drawn
from
the
switchboard
.
4.4
SAFE
OPERATION
RECOMMENDATIONS
1
.
It
is
recommended
that
any
circuit
breaker
be
withdrawn
and
stored
in
the
test
position
when
-
ever
it
is
to
be
maintained
in
the
open
position
with
no
planned
switching
.
2
.
It
is
recommended
that
a
ground
test
device
be
connected
to
the
proper
compartment
when
any
work
is
to
be
done
on
any
bus
or
feeder
circuit
.
Section
5
.
MAINTENANCE
AND
ADJUSTMENTS
5.1
GENERAL
INFORMATION
HK
circuit
breakers
are
designed
for
minimum
maintenance
and
tested
to
insure
that
minimum
maintenance
will
be
required
.
Only
one
basic
adjust
-
ment
is
normally
required
and
that
is
contact
adjust
-
ment
.
This
should
be
checked
to
the
dimensional
values
required
as
described
in
paragraph
5.2
.
Other
adjustments
are
required
only
when
operational
check
indicates
a
need
.
During
maintenance
checks
,
all
accessible
bolts
,
nuts
and
screws
should
be
routinely
checked
to
insure
that
they
are
tight
.
It
is
recommended
that
circuit
breakers
normally
be
inspected
after
2000
operations
.
These
opera
-
tions
can
be
either
no
-
load
mechanical
or
load
cur
-
rent
switching
where
the
power
factor
is
relatively
high
.
When
circuit
breakers
are
used
for
direct
bulk
capacitor
or
reactor
switching
operations
or
for
motor
starting
applications
,
it
is
recommended
that
the
circuit
breakers
be
inspected
after
1000
opera
-
tions
,
because
of
the
switching
severity
.
If
,
however
,
after
the
first
inspection
period
,
there
is
no
indication
of
any
problem
,
actual
operating
experience
can
dictate
the
inspection
cycle
.
Regarding
maintenance
recommendations
follow
-
ing
fault
duty
,
reference
is
made
to
ANSI
Standard
C
37.04
to
which
the
circuit
breakers
have
been
tested
.
In
accordance
with
this
standard
,
a
total
of
400
%
asymmetrical
fault
duty
can
be
accumulated
.
This
is
to
be
ten
or
less
close
-
open
operations
at
less
than
85
%
of
full
fault
duty
;
but
it
can
be
an
accumulation
over
a
long
time
period
of
lower
cur
-
rents
.
The
condition
of
the
breaker
should
be
such
that
after
this
duty
it
is
capable
of
one
more
close
-
open
operation
at
full
fault
current
.
Inspection
is
to
be
made
at
this
time
to
insure
compliance
with
this
requirement
.
Final
operation
can
be
made
if
every
-
thing
is
satisfactory
.
At
this
time
,
maintenance
should
be
performed
,
reconditioning
done
and
re
-
placement
made
as
indicated
.
In
accordance
with
the
same
standard
,
it
is
recom
-
mended
that
after
a
major
fault
duty
cycle
(
CO
15
SEC
.
—
CO
)
,
which
is
known
to
be
between
85
and
100
%
of
the
circuit
breaker
rated
asymmetrical
short
circuit
current
,
the
circuit
breaker
be
inspected
re
-
gardless
of
any
time
period
or
number
of
operations
.
Also
,
when
the
circuit
breaker
is
applied
on
reclos
-
ing
duty
,
it
should
be
inspected
immediately
after
the
series
of
fault
operations
in
the
same
range
of
currents
.
The
condition
of
the
circuit
breaker
after
inter
-
ruption
depends
on
circuit
conditions
regarding
such
things
as
power
factor
,
X
/
R
ratio
and
relay
delay
times
.
Experience
with
specific
circuits
will
indicate
the
future
amount
of
maintenance
that
will
be
required
for
the
various
breakers
and
then
pro
-
cedural
modification
can
follow
.
Where
unusual
service
conditions
exist
,
as
cov
-
ered
by
ANSI
Standard
C
37.04
,
it
must
be
assumed
that
these
conditions
were
considered
at
the
time
of
order
;
that
the
equipment
supplied
was
designed
for
the
special
application
;
and
that
an
appro
-
priate
supplemental
maintenance
program
has
been
developed
.
These
maintenance
instructions
cover
only
circuit
breakers
used
under
standard
usual
service
conditions
.
After
normal
service
without
major
fault
interrup
-
tion
,
the
following
tests
and
adjustments
should
be
made
.
DISCONNECT
”
n
Courtesy of NationalSwitchgear.com

IB
6.2
.
2.7
-
1
Page
7
NOTE
:
The
following
tabulated
tests
and
adjust
ments
are
all
that
are
normally
necessary
for
proper
maintenance
and
operation
of
the
HK
circuit
breaker
.
The
remaining
portions
of
the
breaker
—
dose
coil
assembly
,
shunt
trip
device
,
control
relay
,
auxiliary
switch
and
motor
—
require
no
maintenance
during
the
standard
life
of
the
circuit
breaker
re
-
gardless
of
the
operating
duty
.
At
this
point
,
if
adjustments
are
correct
,
complete
steps
B
6
,
B
7
,
B
8
and
B
9
.
<
B
>
If
any
adjustment
is
incorrect
,
use
the
following
procedure
to
readjust
contact
pressure
or
to
initially
adjust
when
changes
are
made
.
1
.
Completely
slow
-
dose
the
circuit
breaker
and
set
each
pole
for
7
/
64
"
main
contact
compres
-
sion
at
"
A
"
.
(
A
7
/
64
"
rod
or
drill
should
fit
tightly
between
the
EDGE
of
the
metal
stop
plate
and
the
main
contact
stop
.
)
2
.
Open
the
circuit
breaker
,
manually
recharge
closing
springs
,
and
partially
slow
-
close
the
circuit
breaker
until
the
arcing
contacts
of
any
pole
or
poles
just
touch
.
3
.
Advance
the
adjustment
of
lagging
pole
or
poles
so
that
the
three
arcing
contacts
touch
simul
-
taneously
within
1
/
32
"
.
This
adjustment
is
made
by
loosening
locking
nut
(
2
)
and
rotating
adjusting
stud
(
3
)
.
5.2
CONTACT
PRESSURE
{
See
Figure
5
)
(
A
)
With
the
circuit
breaker
withdrawn
from
the
switchboard
,
the
following
step
-
by
-
step
procedure
should
be
followed
for
properly
checking
and
/
or
adjusting
the
contact
pressure
on
"
HK
"
type
circuit
breakers
.
1
.
Remove
interphase
barriers
and
flux
shunts
and
remove
arc
chutes
as
described
in
paragraphs
3.3
and
3.4
2
.
Turn
racking
screw
clockwise
approximately
two
to
three
turns
until
the
racking
-
unlocking
lever
snaps
into
the
first
position
corresponding
to
the
"
DISCONNECT
"
position
.
3
.
Manually
slow
-
close
the
circuit
breaker
as
described
in
paragraph
3.7
,
but
,
only
to
the
point
that
arc
contacts
just
touch
.
All
arcing
contacts
should
touch
within
1
/
32
"
,
after
all
free
play
has
been
removed
by
pulling
the
bridge
arm
toward
the
open
position
.
4
.
Continue
the
slow
-
close
operation
to
fully
dose
the
breaker
.
Each
pole
should
have
approximately
7
/
64
"
to
3
/
16
"
main
contact
compression
measured
at
"
A
"
between
the
edge
of
the
metal
stop
plate
and
the
main
contact
stop
.
(
This
dimension
measured
on
either
side
is
sufficient
)
.
A
rod
or
drill
of
these
sizes
can
be
used
for
measuring
.
Complete
charging
.
the
springs
and
remove
the
slow
close
bracket
.
5
.
Open
the
breaker
.
Fast
close
the
breaker
.
Each
pole
should
have
between
7
/
64
"
to
3
/
16
"
main
contact
pressure
.
4
.
Complete
slow
-
close
operation
to
fully
-
closed
position
and
check
that
main
contact
com
-
pression
of
the
pole
or
poles
that
were
advanced
does
not
exceed
3
/
16
"
.
Also
,
arcing
contact
springs
on
these
poles
should
not
be
fully
compressed
.
If
the
3
/
16
"
dimension
is
exceeded
,
the
entire
proce
-
dure
should
be
repeated
to
obtain
the
correct
gap
at
"
A
"
.
NOTE
:
Occasionally
,
center
pole
contact
pres
-
sure
may
slightly
exceed
3
/
16
"
.
However
,
if
outer
poles
are
within
the
3
/
16
"
dimension
,
and
arcing
contact
springs
of
the
center
pole
are
not
fully
compressed
no
readjustment
need
be
made
.
When
this
condition
exists
,
the
center
pole
parts
before
outer
poles
on
opening
.
5
.
Open
breaker
,
recharge
closing
springs
,
remove
slow
-
close
bracket
,
fast
close
the
breaker
,
recheck
adjustments
for
7
/
64
"
to
3
/
16
"
,
"
A
"
dimension
.
NOTE
:
Fast
-
closing
the
circuit
breaker
results
in
a
slight
increase
in
contact
pressure
over
slow
-
closing
.
6
.
Tighten
locking
nut
(
2
)
on
each
adjusting
stud
(
31
to
lock
contact
pressure
adjustment
stud
in
place
.
7
.
Arc
chutes
can
now
be
replaced
,
and
inter
-
phase
barriers
assembly
can
now
be
reinstalled
.
8
.
Return
racking
screw
to
its
original
position
by
turning
counterclockwise
approximately
two
to
three
turns
until
it
stops
.
9
.
The
circuit
breaker
can
now
be
replaced
in
its
compartment
and
returned
to
service
.
5.3
CONTACT
AND
INSULATION
CLEANING
All
dirt
,
soot
or
grease
should
be
removed
from
cir
-
cuit
breaker
contacts
and
surface
of
entire
current
-
carrying
structure
,
as
well
as
all
insulation
surfaces
.
Fig
.
5
—
Contact
Pressure
and
Bridge
Pivot
Pressure
Courtesy of NationalSwitchgear.com

IB
6.2
.
2.7
-
1
Page
8
i
Breakers
operating
with
normal
loading
will
re
-
quire
no
maintenance
if
the millivolt
drop
does
not
exceed
150
%
of
the
listed values
.
If
the
millivolt
drop
does
exceed
150
%
of
the above values
,
the
main
and
arcing
contacts
should be
dressed
with
a
fine file
,
cleaned
and
adjusted
for
proper
contact
pressure
and then
rechecked
.
If
the values
are
still
in
excess
of
the
150
%
value
,
the
bridge
pivot
pres
sure
should
be
readjusted
as
outlined
in
paragraph
with
a
cloth
saturated
with
an
oil
-
free
OSHA
-
approved
solvent
.
Cleaning
of
insulation
is
impor
-
tant
because
soot
and
dirt
can
accumulate
and
,
with
moisture
,
place
the
circuit breaker
in
jeopardy
,
dielectrically
.
A
degree
of
burning
and
pitting
of
circuit breaker
arcing
contacts
is
to
be
expected
from
normal
operation
;
also
,
on
highly
inductive
or
capacitative
circuits
and
after
major
interruptions
,
some
pitting
may
occur
on
main
contacts
.
A
moderate
amount
of
pitting
will
not
interfere
with
operation
of
the
contacts
.
When
necessary
to
dress
the
contacts
,
cover
the
puffer
nozzle
(
5
,
Figure
1
}
with
a
cloth
,
then
follow
the
contour
of
the
contacts
with
a
fine
file
.
Do
not
attempt
to
eliminate
pitting
entirely
.
After
this maintenance
,
contact
pressure
(
para
-
graph
5.2
)
and
millivolt
drop
(
paragraph
5.4
|
should
be
checked
.
MOTE
:
Replacement
of
contacts
is
required
when
:
after
repeated
dressing
of
any
contacts
,
less
than
50
%
of
the
original
contact
material
thickness is
left
;
*
the
tips
of
the
stationary
arcing
contacts
have
been
eroded
away
;
any
contact
has
been
broken
or
cracked
.
^
Moving
arcing
contact
can
be
inverted when
working
surface
is
reduced
to
less than
50
%
.
5.4
DC
MILLIVOLT
DROP
TEST
During
normal
maintenance
periods
,
the condition
of
the circuit
breaker
can
easily
be
determined
by
performing
a
millivolt
drop
test
.
This
test
should be
performed
regardless
of
whether
the
circuit
breaker
had
interrupted
low
or
high
currents
or
has
mini
-
mum
operations
.
The
following
table
lists the
millivolt
drop
and
re
-
sistance
values
for
the
circuit
breakers
,
when
manu
-
factured
,
covered
by
this instruction
book
,
from
terminal
to
terminal
,
exclusive
of
the
primary
disconnects
.
5.6
.
IMOTE
:
For
optimum
performance
of
the circuit
breakers
during
periods
of
increased
loading
,
it
is
recommended
that the
listed
values be
met
.
After
all
above
steps
have
been
taken
and
the
milli
-
volt
drop
is
still
excessive
,
contact
the
district
office
for
recommendations
.
5.5
PUFFERS
(
5
,
Fiqure
1
)
WARNING
WARNING
WARNING
WARNING
KEEP
CLEAR
OF
ALL
MOVING
PARTS
.
The
performance
of
the
puffers
should
be
checked
during
a
normal
maintenance
inteival
.
Each
puffer
should
provide
a
moderate
blast
of
air
at
breaker
contacts
,
on
opening
of
the circuit
breaker
.
This
can
be
detected
by
holding
a
piece
of
paper
approximately
8
-
1
/
2
"
x
11
"
over
the
top
of
the
contacts
and
opening
the
circuit
breaker
.
All
three
poles
must
have
puffing
action
or
the
circuit
breaker
must
not
be
placed
in
service
.
5.6
BRIDGE
PIVOT
PRESSURE
(
See
Figure
5
)
Bridge
pivot
pressure
should
be
adjusted
only
when
the millivolt
drop
test
indicates
a
problem
.
When
adjustment
is
necessary
,
adjust
as
follows
:
1
.
Locking
bait
(
8
)
should
be
loosened
on
solid
pushrod
models
.
Spring
-
loaded
pushrod
models
do
not
require
disconnecting
.
2
.
Bridge
(
1
)
should
be
disconnected
from
adjust
-
ing
stud
(
3
)
on
solid
pushrod
models
.
3
.
Loosen
one
setscrew
(
6
)
in
one
pivot
nut
—
either side
.
4
.
Tighten
bridge
pivot
nut
(
4
or
5
)
securely
(
ap
-
proximately
75
ft
/
lbs
.
)
.
Then
gradually
back
up
pivot
nut
approximately
1
/
2
to
1
-
1
/
2
flats
until
bridge
(
1
)
motion
is
just
free
when
bridge
is
removed
by
hand
.
On
spring
-
loaded
pushrod
models
,
lift
bridge
against
spring
and then
slowly
release
,
insuring
that
it
resets
freely
.
5
.
Tighten
setscrew
(
6
)
in
nut
that
was
loosened
,
reinstall
adjusting
stud
,
if
disconnected
,
and
readjust
contact
pressure
as
described
in
paragraph
5.2
.
5.7
CLOSING
AND
OPENING
TIMES
After
operation
intervals
noted
previously
or
a
change
in
bridge
pivot
adjustment
,
it
is
recom
-
mended that
opening
and
closing
times
be
checked
I
TABLE
1
.
DC
MV
DROP
AND
RESISTANCE
VALUES
Maximum
Micro
-
Ohms
Maximum
MV
Drop
*
7.5
HK
500
.
15
HK
500.15
HK
750
1200
Amperes
7.5
HK
500
15
HK
500.15
HK
750
?
rJ
0
D
2500
Amp
*
.
;
'
!
5
HK
750
3000
Amperes
9
45
35
7
30
6
I
'
Mfffivoft
drop
with
200
Amperes
flowing
.
Courtesy of NationalSwitchgear.com

]
IB
6.2
.
2.7
-
1
Page
9
i
by
use
of
a
cycle
counter
,
time
-
travel
analyzer
,
*
oscillograph
,
etc
.
,
to
monitor
the
time
from
energiz
-
ing
to
arcing
contact
touch
or
part
.
Circuit
breaker
closing
and
opening
times
should
be
within
the
following
time
ranges
for
norma
)
operation
.
When the entire
leading
edge
and
portions
of
the
flat
arc
plate
are
heavily
encrusted
with
glass
beads
,
the
arc
chute
should
be
replaced
.
It
should
be
noted that
this
condition
will
vary
between
arc
chutes
on
the
same
breaker because
of
single
-
phase
fault
and
asymmetrical
current
incidences
.
5.9
OPERATING
MECHANISM
(
See
Figure
6
)
The
operating
mechanism
is
adjusted
at
the
factory
for
proper
-
operation
and should
not
be
disturbed
unless
the
circuit breaker
does
not
close
electrically
on
reclosing
duty
.
This
condition
is
caused
when
the latch check
switch
(
2
)
at
right
side
of
breaker
(
when
used
)
is
not
actuated
.
Circuit
breaker
should
not
close
before
trip
latch
(
4
)
has
reset
.
Latch
-
check
switch
adjustments
latch
(
4
)
against
stop
pin
(
3
)
:
1
.
Turn
in
adjusting
screw
(
1
)
until
contacts
of
switch
(
2
)
"
break
"
as
indicated
by
an
audible
click
or
check
with
bell
ringer
.
2
.
Retract
adjusting
screw
until
switch
contacts
"
make
"
.
3
.
Rotate
adjusting
screw
one
turn
more
.
(
Adjust
-
ing
screw
is
self
-
locking
.
)
TABLE
2
.
CLOSING
AND
OPENING
TIMES
Cftosifig
Time
Range
**
MS
Opening
Tme
Range
* *
MS
7.5
HK
500
,
15
HK
500
,
15
HK
750
,
1200
trough
3000
Amperes
105
-
140 2542
made
with
* *
At
125
VDC
.
Times
at
other
voltages
may
vary
slightly
.
NOTE
:
Table above
also
applies
to
15
HK
500
,
60
KA
high
-
momentary
and
15
HK
750
,
80
KA
high
momentary
.
NOTE
:
Below
0
°
C
,
the
closing
times
will
increase
(
but
with
no
reduction
in
closing
force
)
;
and
opening
times
will
be
within
the
limits
.
Adjustments
to
correct
speeds
,
if
found
to
be
outside
limits
,
are
critical
and
our
district
office
should
be
contacted
for
recommendations
.
>
5.8
ARC
CHUTES
The
arc
chutes should
be
inspected
internally
to
insure that
no
breakage
occurred
to
liner
plates
or
arc
plates
.
Further
,
there
may
be
a
crust
formed
on
the liner
plates
if
local
current
interruptions
were
close
to
the
continuous
current
rating
of
the
breaker
,
or
moderate
faults
were
interrupted
.
This
crust
should
be
removed
by
carefully
using
a car
-
borundum
stone
or
scraper
.
The
arc
chute
should
then
be
blown
out
with
compressed
air
to
remove
the
resultant dust and
particles
.
After
400
%
accumulated
current
or
major
interrup
-
tions
occur
,
the circuit breaker should be
inspected
immediately
.
All
maintenance
checks
or
tests
noted
above should be carried
out
,
plus
close
examination
of
the
arc
chute
.
Arc
plate
and
liner
plate
breakage
should be
carefully
looked
for
,
along
with
excessive
erosion
of
the
arc
plates
.
Arc
plates
are
made
of
ceramic
material
and
perform
the
function of
extracting
heat
from
the
arc as
it
is
being
forced
into
and
elongated by
them
.
The
leading edges
become
coated
with
glass
that
comes
to
the
surface from
the
extreme
heat
.
Direct
measure
of
use
is the
amount
of
glass
beads evident
.
J
OPENING
THROUGH
R
.
H
.
HOUSING
Fig
.
6
—
Latch
Check
Switch
Adjustment
5.10
CONTROL
RELAY
ADJUSTMENT
(
See
Figure
7
)
The
control
relay
does
not
normally
require
any
adjustment
in
the
field
.
However
,
if
necessary
,
adjust
the
gap
between the
control
device lever
adjusting
screw
and the
limit
switch
crank
arm
for
a
1
/
64
"
-
1
/
32
"
gap
with
the
closing
springs charged
.
With
the
closing
springs
discharged
,
the
gap
between
the
lever
stop
and
the
lever
should
be
1
/
64
"
to
1
/
16
"
.
)
mFor
measuring
circuit breaker
speeds
,
analyzer
mounting
sup
-
port
and
instructions
are
available
on
special
order
.
Courtesy of NationalSwitchgear.com

IB
6.2
.
2.7
-
1
Page
10
I
LEVER
,
ADJ
.
SCREW
AND
LOCK
NUT
2
.
All
other
mechanism
parts
,
bearings
,
pins
,
etc
.
have
been
lubricated
with
ANDEROL
757
manu
-
factured
by
Tenneco
Chemical
,
Inc
.
,
Intermediate
Division
.
In
order
to
maintain
reliable
operations
,
it
is
impor
-
tant
that
all
circuit
breakers
be
lubricated
at
all
times
.
All
bearings
and
rolling
surfaces
that
require
lubrication
have
been
properly
lubricated
at
the
factory
during
assembly
and
should
not
require
any
further
lubrication
during
the
life
of
the
equip
-
ment
.
tendency
to
oxidize
with
age
,
as
evidenced
by
hardening
and
darkening
in
color
.
In
addition
to
lubricant
oxidation
,
frequent
operation
of
the
breaker
causes
lubricant
to
be
forced
out
from
between
the
bearing
surfaces
.
When
these
changes
occur
,
regreasing
is
required
to
maintain
reliable
operation
of
the
breaker
.
Elimination
of
the
hard
-
ened
lubricant
is
essential
before
regreasing
is
performed
.
A
simple
lubrication
will
often
clear
up
minor
misoperations
which
might
be
mistaken
for
more
serious
trouble
.
If
the
grease
should
become
contaminated
or
parts
are
replaced
,
lubrication
should
be
done
with
NO
-
OX
-
ID
or
ANDEROL
grease
as
applicable
.
Use
of
other
greases
have
not
been
proven
by
test
and
are
not
recommended
.
NOTES
:
1
.
Do
not
use
NO
-
OX
-
ID
grease
on
any
main
and
arcing
contact
surfaces
.
2
.
It
is
recommended
that
the
primary
disconnects
be
maintained
by
renewing
the
NO
-
OX
-
ID
grease
during
maintenance
periods
.
3
.
Do
not
use
light
oil
to
lubricate
any
mechanism
parts
.
4
.
The
charging
motor
is
sealed
and
no
lubrication
is
required
.
5.13
DIELECTRIC
TESTS
If
it
is
desired
to
make
dielectric
tests
during
main
-
tenance
periods
,
the
following
test
values
should
be
used
.
These
are
to
be
applied
for
a
one
minute
period
.
CONTROL
LEVER
STOP
However
,
even
the
finest
greases
have
a
LIMIT
SWITCH
CRANK
CONTROL
DEVICE
Fig
.
7
—
Control
Relay
5.11
RACKING
MECHANISM
(
See
Figure
8
}
The
circuit
breaker
racking
mechanism
is
adjusted
for
proper
operation
and
should
not
be
disturbed
unless
it
becomes
possible
to
close
the
breaker
during
a
racking
operation
.
If
it
is
possible
to
close
breaker
during
a
racking
operation
,
it
may
be
that
interlocked
blocking
mem
-
bers
are
not
positioned
properly
,
which
should
be
corrected
as
follows
:
1
.
Remove
the
front
mechanism
coverplate
.
2
.
With
circuit
breaker
closed
,
make
adjustments
by
regulating
length
of
connecting
rod
(
1
)
for
1
/
8
"
minimum
to
3
/
16
"
maximum
clearance
at
"
A
"
be
-
tween
trip
link
(
3
)
and
blocking
lever
(
2
)
.
i
/
•
o
RACKING
LEAD
SCREW
2
3
RACKING
RELEASE
LEVER
l
(
o
\
o
TABLE
3
.
DIELECTRIC
TEST
VALUES
PADLOCK
LOCKOUT
PLATE
Circuit
60
Hz
DC
Fig
.
8
—
Racking
Mechanism
21.5
kV
30
kV
Primary
Circuit
1100
V
‘
Secondary
Circuit
(
Control
)
1500
V
5.12
LUBRICATION
The
HK
circuit
breakers
are
lubricated
during
factory
assembly
as
follows
:
1
.
All
mating
surfaces
of
moving
current
-
carry
-
ing
joints
have
been
lubricated
with
NO
-
OX
-
ID
special
grade
"
A
"
grease
manufactured
by
Sanchen
Company
.
mtt
is
necessary
that
the
charging
motor
be
disconnected
for
this
test
by
turning
the
motor
disconnect
switch
to
the
"
OFF
"
position
,
tf
a
tost
is
desired
on
the
motor
,
then
the
motor
disconnect
switch
should
be
turned
to
the
"
ON
”
position
and
the
circuit
retested
at
540
Vr
60
Hi
or
760
V
i
DC
.
Courtesy of NationalSwitchgear.com