ABB VHK-R User Manual

II
»
11
MIPIP
ID
Page
5
ASEA
BROWN
BOVERI
If
,
however
after
the
first
inspection
period
there
is
no
indication
of
any
problems
,
actual
operating
experience
with
specific
circuits
will
indicate
the
future
amount
of
maintenance
needed
for
the
various
circuit
breakers
and
the
procedure
can
be
modified
as
required
.
Manual
Operation
of
Electrically
Operated
Models
Electrically
operated
circuit
breakers
may
be
charged
manually
by
a
removable
maintenance
handle
for
bench
tests
or
emer
-
gency
operation
.
To
manually
charge
the
closing
springs
,
first
position
the
maintenance
handle
hooked
section
in
the
long
slot
on
the
pawl
carrier
(
Refer
to
Figure
2
)
.
The
small
tab
on
the
maintenance
handle
will
fit
the
small
hole
of
the
pawl
carrier
.
Using
a
pumping
motion
,
rotate
the
pawl
carrier
until
the
ratchet
wheel
no
longer
rotates
.
At
this
point
,
the
spring
charged
in
-
dicator
will
indicate
SPRINGS
CHARGED
.
The
circuit
breaker
can
be
closed
manually
with
the
manual
close
lever
.
NOTE
:
Occasionally
the
motor
crank
arm
will
stop
in
a
position
that
will
not
allow
manual
spring
charging
.
When
this
happens
,
the
motor
crank
arm
must
be
rotated
manually
by
using
a
screwdriver
to
rotate
the
crank
arm
sufficiently
so
that
the
springs
may
then
be
manually
charged
with
the
maintenance
handle
.
Where
unusual
service
conditions
exist
,
as
covered
by
ANSI
Standard
C
37.04
,
it
must
be
presumed
thatthese
conditions
were
considered
at
the
time
of
order
and
that
the
equipment
supplied
was
designed
for
the
special
application
and
that
an
appropriate
supplemental
maintenance
program
has
been
developed
.
These
maintenance
instructions
only
cover
circuit
breakers
used
under
the
standard
service
conditions
.
At
the
selected
maintenance
period
,
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
theVHK
-
R
circuit
breaker
.
The
remaining
portions
of
the
breaker
-
close
coil
assembly
,
shunt
trip
device
,
control
relay
,
auxiliary
switch
and
motor
-
-
require
no
maintenance
during
the
standard
life
of
the
circuit
breaker
regardless
of
the
operating
duty
.
MAINTENANCE
,
ADJUSTMENTS
AND
TESTS
General
Information
The
VHK
-
R
circuit
breakers
are
designed
for
minimum
mainte
-
nance
and
tested
to
insure
that
only
minimum
maintenance
will
be
required
.
The
few
adjustments
that
are
noted
are
required
only
when
an
operational
check
indicates
a
problem
.
Of
course
,
during
the
maintenance
checks
,
all
accessible
bolts
,
units
and
screws
should
be
routinely
checked
to
insure
that
they
are
tight
.
D
.
C
.
Millivolt
Drop
Test
During
maintenance
periods
,
the
condition
of
the
breaker
current
circuit
can
easily
be
determined
by
performing
a
millivolt
droptest
.
This
test
should
be
performed
regardless
of
whether
the
circuit
breaker
had
interrupted
low
or
high
currents
or
has
minimum
operations
.
It
is
recommended
that
the
circuit
breaker
be
normally
inspected
after
the
first
2000
operations
,
regardless
of
the
type
of
duty
it
is
used
for
.
These
operations
can
be
either
no
-
load
mechanical
,
load
current
switching
,
bulk
capacitor
or
reactor
switching
opera
-
tions
,
or
for
motor
starting
applications
.
The
following
table
lists
the
millivolt
drop
and
resistance
values
for
the
circuit
breakers
covered
by
this
instruction
book
,
from
term
inal
to
terminal
,
exclusive
of
the
primary
disconnects
.
Vacuum
interrupters
,
as
used
on
the
VHK
-
R
circuit
breakers
,
have
an
inherently
long
contact
life
and
will
provide
trouble
-
free
service
under
varied
application
conditions
,
as
long
as
the
circuit
breaker
is
applied
within
its
rating
.
The
wear
condition
of
the
individual
vacuum
interrupters
will
vary
,
depending
on
circuit
conditions
and
such
variables
as
single
phase
versus
three
-
phase
interruption
,
X
/
R
ratio
(
asymmetry
)
and
relay
delay
times
.
Of
course
,
interrupting
high
short
-
circuit
current
will
cause
contact
erosion
to
occur
faster
than
load
current
interruptions
.
The
interrupters
for
the
VHK
-
R
Circuit
Breakers
are
tested
up
to
2000
%
KSI
.
It
is
unlikely
that
a
circuit
breaker
will
be
subjected
to
this
much
duty
during
the
life
of
the
breaker
and
it
is
not
expected
that
the
interrupters
will
have
to
be
replaced
due
to
excessive
erosion
of
contacts
.
There
is
,
however
,
a
check
for
contact
wipe
(
contact
pressure
)
which
is
also
a
measure
of
contact
erosion
.
This
check
is
covered
under
"
Circuit
Breaker
Operation
and
Contacts
"
.
When
contact
wipe
is
less
than
the
minimum
specified
and
there
is
not
a
mechanical
problem
,
then
the
interrupter
should
be
replaced
due
to
contact
erosion
.
MV
:
;
;
iDtopil
Maximum
Mte
^
Ohms
CIrcul
Breaker
250
1200
Ampere
8
40
*
Millivolt
drop
with
20
(
fcmperes
DC
flowing
.
Insulation
Cleaning
Any
dirt
,
dust
or
grease
should
be
removed
from
the
surfaces
of
the
entire
current
carrying
structure
and
vacuum
interrupter
*
.
Wiping
the
surface
with
a
clean
lint
free
cloth
is
normally
sufficient
for
this
purpose
.
Courtesy of NationalSwitchgear.com

ABB VHK-R Specifications

General

Brand	ABB
Model	VHK-R
Category	Circuit breakers
Language	English