ABB VHK-R - Lubrication; Dielectric Tests

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ASEA
BROWN
BOVERI
1
.
The
internal
shield
of
a
vacuum
interrupter
can
acquire
an
electrical
charge
which
is
usually
retained
even
after
the
voltage
is
removed
.
On
certain
types
of
interrupters
,
this
shield
is
attached
to
the
exposed
mid
-
band
ring
and
a
grounding
stick
should
be
used
to
discharge
the
ring
before
working
on
the
device
.
LUBRICATION
The
VHK
-
R
circuit
breakers
are
lubricated
during
factory
assem
-
bly
as
follows
:
1
.
The
primary
disconnect
contacts
have
been
lubricated
with
NO
-
OX
-
ID
special
grade
-
A
grease
manufactured
by
Sanchem
,
Inc
.
(
ABB
No
.
713222
A
,
1
Pt
.
can
)
.
2
.
Dielectric
test
voltages
higher
than
rated
voltage
,
applied
across
open
contacts
,
may
cause
a
vacuum
interrupter
to
emit
some
X
-
radiation
which
could
be
a
health
hazard
on
prolonged
exposure
at
close
range
.
Accordingly
,
even
though
the
emission
is
low
and
on
for
such
a
short
period
of
time
,
it
is
considered
appropriate
to
exercise
caution
.
2
.
All
other
mechanism
parts
,
bearings
,
pins
,
etc
.
,
have
been
lubricated
with
Anderol
757
manufactured
by
Nuodex
,
Inc
.
(
for
-
merly
Tenneco
Chemical
,
Inc
)
.
(
ABB
No
.
712994
A
,
4
oz
.
tube
)
.
Therefore
,
do
not
run
any
primary
circuit
dielectric
withstand
tests
on
isolated
interrupters
with
open
contacts
,
above
rated
voltage
unless
tost
personnel
are
adequately
shielded
or
they
are
no
less
than
six
feet
from
the
test
unit
.
If
the
grease
should
become
contaminated
or
unduly
oxidized
(
hardened
and
darkened
)
or
if
parts
are
replaced
,
any
relubrica
-
tion
should
be
done
with
the
lubricants
noted
.
NOTES
:
It
is
noted
that
NO
hazardous
X
-
radiation
is
produced
with
closed
contacts
at
any
test
voltage
or
with
open
contacts
at
rated
voltage
and
there
should
be
no
cause
for
concern
.
Further
,
if
the
breaker
is
tested
in
its
switchgear
compartment
,
the
enclosure
steel
provides
sufficient
shielding
to
protect
personnel
from
X
-
radiation
at
the
test
voltages
recommended
below
at
the
normal
distances
maintained
for
electrical
safety
.
1
.
It
is
recommended
that
the
primary
disconnects
be
maintained
by
renewing
the
grease
.
The
mechanism
should
be
periodically
inspected
for
lubrication
contamination
;
frequency
of
inspection
is
dependant
on
operating
environment
.
2
.
Do
not
use
light
oil
to
lubricate
any
mechanism
parts
.
In
emergency
situations
,
Anderol
732
may
be
used
as
a
temporary
lubricant
.
In
these
cases
,
allow
time
for
the
solvents
to
evaporate
prior
to
any
mechanical
operations
.
It
is
mandatory
that
the
breaker
undergo
thorough
lubrication
with
Anderol
757
atthe
next
maintenance
interval
.
Use
of
solvents
to
free
contaminated
lubricant
is
strictly
forbidden
without
immediate
relubrication
using
Anderol
757
.
Note
that
bearing
surfaces
must
be
repacked
and
this
will
require
disassembly
of
the
mechanism
.
Do
not
operate
circuit
breaker
without
completing
this
procedure
.
The
following
test
values
should
be
used
for
dielectric
testing
the
new
breaker
and
are
to
be
applied
for
a
one
-
minute
period
.
Deicrlptfoi
60
Hz
Primary
Circuit
19.0
kV
5
KV
3
.
The
charging
motor
is
sealed
and
no
lubrication
is
required
.
*
Secondary
Circuit
(
Control
)
1100
V
36.0
kV
Primary
Circuit
15
KV
DIELECTRIC
TESTS
1100
V
*
Secondary
Circuit
(
Control
)
It
is
recommended
that
dielectric
withstand
tests
be
made
priorto
use
and
then
at
routine
maintenance
periods
to
verify
the
integrity
of
vacuum
interrupters
.
If
,
during
the
dielectric
withstand
test
,
the
required
test
voltage
cannot
be
sustained
across
the
open
con
-
tacts
of
the
vacuum
interrupter
,
the
interrupter
is
faulty
and
must
be
replaced
.
Always
insure
that
the
contact
air
gap
is
correct
before
conducting
primary
circuit
dielectric
tests
.
Once
in
service
,
the
primary
circuit
should
be
tested
at
75
%
of
this
rating
*
lf
it
is
desired
to
make
a
dielectric
test
on
the
secondary
control
wiring
,
turn
the
spring
charging
motor
disconnect
switch
(
1
,
Fig
.
3
)
to
the
"
OFF
"
position
.
Apply
test
voltage
(
1100
V
-
AC
)
for
one
minute
to
each
of
the
secondary
disconnect
contacts
at
the
rear
of
the
circuit
breaker
.
’
*
1
>
1
*
vh
TJ
f
?
»
,
If
it
is
desired
to
make
a
dielectric
test
on
the
spring
charging
motor
,
turn
the
motor
disconnect
switch
(
1
,
Fig
.
3
)
to
the
"
ON
"
position
.
Apply
test
voltage
(
540
V
-
AC
)
for
one
m
in
ute
to
the
motor
circuit
.
<
2
.
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•
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