BZMJ Series Self-healing Low Voltage Shunt Capacitors
06
1
The
measured
current
of
a
newly
connected
capacitor
is
much
smaller
than
the
rated
current
on
its
nameplate
(
same
for
multiple
capacitors
).
If
a
capacitor
with
higher
rated
voltage
is
connected
to
380V
grid
,
the
actual
output
current
will
be
much
smaller
,
which
is
normal
.
There
is
nothing
wrong
with
the
capacitor
,
it
is
just
derated
.
User
should
determine
the
status
of
a
capacitor
based
on
its
measured
capacitance
value
(μ
F
).
The
actual
operating
current
IC
=
U
c
/
U
N
×
I
N
2
The
current
of
the
capacitor
is
closed
to
rated
current
when
it
is
first
put
into
operation
,
but
the
current
drops
after
a
period
of
time
.
The
current
drops
as
the
capacitance
value
of
the
capacitance
decreases
.
There
are
several
reasons
for
capacitance
decrease
such
as
improper
use
,
large
harmonic
or
quality
defect
.
Find
out
the
reason
and
solve
the
problem
.
User
must
replace
the
capacitor
if
the
capacitance
value
drops
below
50
%.
No
.
Faults
Cause
analysis
Troubleshooting
method
Analysis
and
Troubleshooting
of
Faults
Table
7
Analysis
and
Troubleshooting
of
Faults
7
.
1
Daily
maintenance
and
calibration
Check
if
the
operating
current
of
the
capacitor
is
normal
by
using
the
amperemeter
and
compensation
controller
in
the
cabinet
.
Check
if
there
is
any
deformation
,
oil
leakage
and
overheating
.
Abnormalities
such
as
overcurrent
and
overtemperature
caused
by
harmonic
will
reduce
the
service
life
of
the
capacitor
and
can
cause
damage
to
other
components
and
conductors
in
the
cabinet
due
to
overload
.
7
.
2
Maintenance
during
operation
Tighten
the
terminal
screws
of
the
capacitor
on
a
regular
basis
(
once
half
a
year
)
to
prevent
poor
contact
.
Remove
dust
and
greasy
dirt
.
User
should
pay
close
attention
to
the
cabinet
and
replace
any
damaged
capacitor
in
time
if
any
under
-
compensation
of
power
factor
occurs
due
to
significant
capacitance
drop
(
50
%
current
decrease
),
otherwise
it
may
lead
to
penalty
.
If
all
the
capacitors
are
operating
and
in
good
condition
but
the
power
factor
still
cannot
meet
requirement
,
user
must
add
capacity
in
time
to
ensure
the
automatic
cycle
operation
of
the
capacitors
.
7
.
3
Service
cycle
User
should
determine
the
service
cycle
based
on
the
application
conditions
,
the
recommended
service
cycle
for
cabinet
is
once
half
a
year
.
7
.
4
Maintenance
for
long
-
term
idle
If
the
capacitor
has
been
idled
for
one
year
or
longer
,
please
check
if
its
capacitance
value
is
within
the
allowable
deviation
range
(-
5
%~+
8
%);
conduct
pole
-
to
-
case
voltage
withstand
test
again
(
apply
AC
3kV
for
5
seconds
);
or
use
megameter
to
test
if
the
insulation
resistance
between
the
three
phase
terminals
and
the
case
is
larger
than
100M
Ω
before
using
the
product
.
7
.
5
Storage
conditions
,
storage
period
and
precautions
The
smart
capacitor
should
be
stored
in
a
dry
and
well
-
ventilated
room
and
protected
from
rain
,
moist
,
chemicals
and
dust
.
The
maximum
storage
period
of
the
product
is
36
months
.
Do
not
put
the
smart
capacitor
or
its
package
directly
on
the
floor
.
controller
is
not
working
normally
,
shut
down
the
equipment
for
inspection
and
repair
.
6
.
6
.
2
If
the
busbar
in
the
cabinet
is
of
bottom
-
in
and
top
-
out
type
,
user
must
disconnect
the
bus
before
replacing
the
capacitors
or
other
electric
components
.
However
,
user
only
needs
to
disconnect
the
isolation
switch
in
the
cabinet
when
changing
the
secondary
wiring
or
testing
the
capacitors
.
6
.
6
.
3
Before
testing
and
touching
the
capacitors
,
user
must
conduct
short
circuit
discharge
between
each
two
terminals
of
the
3
-
phase
capacitor
.
Maintenance
and
Storage
