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 Characteristic
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DNK,RNV & SNV Series are Metallized polypropylene Capacitors designed
primarily for use in Motor run applications. They are also use in AC power
supplies. The low dielectric losses, the inherent "Self-healing" property, and
the greatly increased micofarad per unit volume make these designs ideal where
reliaility and small size are essential.. |
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Specification
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1. Capacitance : 1~ 50㎌
2. Capacitance tolerance : -5% to
+10%
3. Rated frequency : 50Hz and/or 60Hz
4. Rated voltage : 220~500VAC
5. Maximum ambient temperature : -25℃ to +80℃
6. Withstanding Voltage :
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| Test Portion |
TestVoltage (Effectivevalue)[VAC] |
Applying time |
| Between terminals mutually |
Rated Voltage X 1.75 |
(60 sec) |
| Between terminals (tied together) and case |
Rated Voltage X 2+1000 (Min.1500VAC) |
(60 sec) |
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7.Insulation resistance
Between the collected terminals and the case, 2000㏁ or greater
8.
Dissipation factor
0.1% Max, at60Hz, 20℃ or 85℃
9. Seal ability
There
shall be no oil leakage even if left for 1 hour under a constant Temperature of
85℃
10. Internal protection : Pressure Sensitive interrupter
11. Fault
current : 10,000AFC |
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Product Safety
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In
certain
instances
capacitor
failures
may
result
in
case
rupture
due
to
gases
generated
internally.
Since
the
elimination
of
the
PCB
impregnants
for
environmental
reasons
all
the
impregnants
now
in
use
are
classified
as
combustible
and
carry
a
NFPA(National
Fire
Protection
Association)designation
of
type
III
B.
Liquids
with
this
classification,
such
as
mineral
oil
and
bland
oil
have
been
in
use
for
over
40
years
with
excellent
safety
records.
Even
if
rupture
does
occur,
the
probability
of
fire
is
still
low
as
the
right
conditions
of
temperature
and
source
of
ignition(i.e.an
electrical
arc)
must
be
present.
In
order
to
reduced
the
possibility
of
capacitor
rupture
the
NUINTEK
CO.,LTD.
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Now
incorporates
an
internalprotection
mechanism
into
DNK,RNV
and
SNV
series
capacitors
where
the
construction
and
application
conditions
allow.
The
listings
of
each
family
of
capacitors
indicate
if
internal
protection
is
included
or
not.
The
protective
mechanism
is
the
Pressure
Sensitive
Interrupter.
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Pressure Sensitive Interrupter
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The
Pressure
Sensitive
Interrupter
or
PSI
was
developer
by
the
NUINTEK
CO.,LTD.
It
senses
the
build-up
of
pressure
with
in
the
capacitor
and
interrupts
the
internal
connections
taking
the
capacitor
out
of
the
circuit
before
rupture
can
occur,
as
shown
in
Figure.
The
fault
current
is
the
maximum
current
that
the
circuit
can
provide
if
the
capacitor
becomes
a
short
circuit.
IT
IS
THE
RESPONSIBILITY
OF
THE
CAPACITOR
USER
TO
DETERMINE
WHAT
THE
AVAILABLE
FAULT
CURRENT
IS.
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Mounting Considerations for The PSI
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The
proper
operation
of
the
pressure
sensitive
interrupter(PSI)
requires
that
the
cover
be
allowed
to
bulge
without
restraint.
If
this
expansion
is
restricted
it
may
interfere
with
the
PSI
mechanism.
The
following
should
be
considered
when
mounting
capacitors
containing
the
PSI.
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There
must
be
a
clearance
of
at
least
0.5
inches(12.7mm)
between
the
tops
of
the
terminals
and/or
the
assembled
wire
connector
and
a
plane
perpendicular
to
the
capacitor
terminals.
In
addition,
care
should
be
taken
to
ensure
that
there
is
still
adequate
electrical
clearance
between
the
terminals
and
the
overhead
surface
after
PSI
operation.
In
certain
cases
capacitors
are
mounted
with
the
top
of
the
capacitor
case
resting
on
the
chassis
and
the
terminals
protruding
through
the
chassis.
Care
must
be
taken
to
see
that
the
cut-out
in
the
chassis
is
large
enough.
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