ABB 5HK Series User Manual

Aim
MIPIP
IB
6.2
.
1.7
D
Page
7
ASEA
BROWN
BOVERI
rated
asymmetrical
short
circuit
current
,
the
circuit
breaker
be
inspected
regardless
of
any
time
period
or
number
of
operations
.
Also
,
when the
circuit
breaker is
applied
on
reclosing duty
,
it
should be
inspected
immediately
afterthe
series
of fault
operations
in
the
same
range
of
currents
.
The condition
of
the circuit
breaker
after
interruption
de
-
pends
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
mainte
-
nance
that
will
be
required
for
the various breakers and
then
procedural
modification
can
follow
.
Where unusual service conditions exist
,
as
covered
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 applica
-
tion
;
and that
an
appropriate supplemental
maintenance
program
has been
developed
.
These maintenance instruc
-
tions
cover
only
circuit breakers used under standard usual
service
conditions
.
After
normal
service without
major
fault
interruption
,
the
following
tests
and
adjustments
should be made
.
NOTE
:
The
following
tabulated
tests
and
adjustments
are
all that
are
normally
necessary
for
proper
maintenance
and
operation
of
the
HK
circuit breaker
.
The
remaining
portions
of
the
breaker
-
close coil
assembly
,
shunt
trip
device
,
control
relay
,
auxiliary
switch
and
motor
—
require
no
main
-
tenance
during
the standard
life
of
the circuit breaker
regardless
of
the
operatinq
duty
.
5.2
CONTACT
PRESSURE
(
See
Figure
4
)
(
A
)
With
the circuit
breaker withdrawn
from
the switch
-
board
,
the
following
step
-
by
-
step
procedure
should be
followed for
properly checking
and
/
or
adjusting
the
contact
pressure
on an
“
HK
”
type
circuit breaker
.
1
.
Remove
interphase
barrier
assembly
and
remove arc
chutes
as
described
previously
.
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
parag
raph
3.7
,
but
only
to
the
point
that the
arc
contacts
just
touch
.
All
arcing
contacts
shouldtouch
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
close 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
sprinqs
and
remove
the slow
close
bracket
.
Fig
.
4
—
Contact
Pressure
and
Bridge
Pivot
Pressure
5
.
Open
the
breaker
.
Fast close the breaker
.
Each
pole
should have between
7
/
64
"
to
3
/
16
"
main
contact
pressure
.
At
this
point
,
if
the
adjustments
are
correct
,
complete
steps
B
6
,
B
7
,
B
8
and
B
9
following
.
(
B
)
If
any
adjustment
is incorrect
,
use
the
following
proce
-
dure
to
readjust
contact
pressure
or
to
initially adjust
when
changes
are
made
.
1
Completely
slow
-
close the circuit breaker and
set
each
pole
for
7
/
64
"
main
contact
compression
at
"
A
”
(
A
7
/
64
”
rod
ordrill should
fit
tightly
between the
EDGE
of
the metal
stop
plate
and the
main
contact
stop
.
)
2
.
Open
the circuit
breaker
,
manually
recharge
the
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
the
lagging
pole
or
poles
so
that the three
arcing
contacts
touch
simultaneously
within
1
/
32
"
.
This
adjustment
is made
by loosening locking
bolt
or
set
screw
(
depending
on
model
) (
2
)
and
rotating adjusting
stud
(
3
)
.
4
Complete
slow
-
close
operation
to
fully
closed
position
and check that the main
contact
compression
of
the
pole
or
poles
that
were
advanced
does
not
exceed
3
/
16
"
.
Also
,
the
arcing
contact
springs
on
these
poles
should
not
be
fully
compressed
.
If
the
3
/
16
"
dimension is exceeded
,
the entire
procedure
should
be
repeated
to
obtain the
correct
gap
at
“
A
”
.
NOTE
:
Occasionally
,
the
centerpole
contact
pressure
may
slightly
exceed
3
/
16
"
However
,
if
the
outer
poles
are
within
3
/
16
"
dimension
and the
arcing
contact
springs
of
the
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ABB 5HK Series Specifications

General

Brand	ABB
Model	5HK Series
Category	Circuit breakers
Language	English