KEMET Electronics Italia s.r.l.
Pag.
1 di 2
MANUALE TECNICO - COD. 39519801300
KEMET Electronics Italia S.r.l.
A Kemet Company
Via San Lorenzo, 19
I - 40037 Sasso Marconi (BO) Italy
Tel. (+39) 051 939111
Fax (+39) 051 840684
www.kemet.com
THREE-PHASE CAPACITORS FOR LOW VOLTAGE POWER FACTOR
CORRECTION
MKP 1.88/3 - 1.88/3 H
THE CAPACITORS COMPLY WHIT CEI EN 60831-1/2. SPECIFICATIONS
AND MUST BE INSTALLED TAKING INTO ACCOUNT THE FOLLOWING INSTRUCTIONS
Instructions
Cooling
The capacitors belong to the temperature rating of -
25°C for which the minimum standard temperature is not
lower than -25°c and the maximum room temperature is
not higher than +50°C.
The average value of the room temperature must not
exceed 40°C over 24 hours period and 30°C over one
year.
If the capacitors in operation are able to modify the room
temperature, adequate ventilation has to be provided.
In this case the cooling air must not exceed of 5°C the
maximum and medium upper limits of the category which
the capacitors belong to.
The air cooling temperature must be measured at the
hottest point, in stationary conditions, in the middle of
two units; in case of one unit only at a height equal to 2/3
of overall unit height at a distance of 0,1m outwards.
In case the capacitors are frequently exposed to the sun
radiation or to any high surface temperature, units rated
for voltages and temperatures higher than nominal ones
must be used.
Control and protection devices
Control and protection devices, including electrical
connections of the capacitors, must be selected to stand
continuous current at least equal to 1,3 times the nominal
value indicated on the capacitors rating plate (which
would be obtained with the sinusoidal voltage) with the
RMS value equal to the rated voltage at the rated
frequency.
Taking into account the possible conditions of current
overload and the higher heating effect due to possible
harmonic components, it is necessary to provide with
insulating switches or switches adjusted for currents not
lower than 1,6 - 1,8 times the current obtainable with a
rated sinusoidal voltage with the RMS value equal to the
rated voltage at the rated frequency.
In case of installation of manual switches, use quick-
release switches.
Connecting devices have got to limit the current peak at
the inserction according to CEI EN60831 –1
Terminal tightening
After some hours from the setting at work, verify the
correct tightening of the electrical connections between
the capacitors; periodically check them.
-----------------------------------------------
Attention !
Kemet disclaims all
responsability for damages of any kind
caused by the utilization of its products
non
in
compliance
with
these
specification
Discharge device
Each capacitor is provided with discharge
resistances to ensure residual voltages lower than
75V within three minutes after the disconnection of
the same: if the capacitors are repeatedly charged
and discharged (e.g. automatic equipments) it is
necessary to adopt additional discharge devices so
that the residual must not exceed 10% of rated
value at the moment of the charge of the capacitor.
Power
factor
correction
in
presence
of
harmonics
Every time in the network there are AC/DC static
conversion groups for the feeding or adjustment of
direct current (DC motors, electrolytic baths, etc.
...), static converters of frequency, induction ovens,
the capacitors can be subject to current and/or
voltage overloads which can cause their quick
wearing.
In this case TECHNICAL SERVICE is available to
verify the need to use harmonic filters or suitable
capacitors for the application.
Maximum current admitted
The current absorbed by the capacitor due to the
presence of harmonics or to a voltage higher than
the rated one must not exceed 1,3 times the rated
current at rated frequency and rated sinusoidal
voltage.
Maximum voltage admitted
The
capacitors
are
designed
to
withstand
overvoltages without a particular wearing; the
amplitude of these overvoltages depends on their
duration, on the number of applications and on the
temperature of the capacitors.
Anyway it is necessary to verify that the rated
voltage of the capacitors is not lower than the rated
voltage of the network to which they are connected,
taking into account the influence of their presence.
In fact the life of a capacitor is negatively
influenced by an excessive increase of voltage on
the dielectric.
When several capacitors are connected in parallel it
is necessary to ensure that the total current in the
bus bars never exceeds 80A in nominal conditions.
On the contrary, it is necessary to reduce the
current connecting the battery to the network with
or more terns of cables. (See fig. 4)
Grounding
The capacitor must be connected to ground using
the screw placed on their metal base (M8).
TEMPLATE OF DRILLING
fig. 1
How to connect the capacitors.
fig. 2
The capacitors should be mounted vertically in order to facilitate
the cooling conditions.
fig. 3
Interconnection should be made as above including recommended
applied torque.
fig. 4
Parallel connection of capacitors.
Warranty
Our Company guarantees the capacitors Three Phase C88H Series for a
period of 24 (Twenty four) months from date of purchase as evidenced by
a our invoice number
file : m_nc88in.doc , codice :
3.951.98.01300
