Product Brief 2011
Power Capacitors
MKK-DC / MKK-DCI (-H) / MKK-DC-R
Characteristics and
properties
High performance gas-impreg-
nated capacitors offered for
applications with medium volt-
age from 1500 to 3000 V DC
and medium currents, with
clear advantages in terms of
lightness and reduced cost.
Oil-impregnated capacitors are
alternatives when applications
demand high operating temp-
erature and currents, resulting
in critical heating that is more
effectively evacuated by oil.
This technology in oil is also
more suitable for applications
with high nominal voltages of
>1800 V DC and/or high ripple
voltages above 400 V RMS.
Polyurethane resin-filled capa-
citors are offered in low voltage
applications with high currents
due to their more simple con-
struction with less compo-
nents. The resin acts as insula-
tor and heat conductor.
In those cases where due to
constraints in the application,
the design of choice as ex-
plained above is not advisable
or appropriate, a special
custom-made design with
another technology is possible.
Applications
DC-voltage applications for
DC link
Resonant filtering
Frequency converters
Housing
Rectangular non-magnetic
stainless steel case
Ferric steel, aluminum
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Power Capacitors
Overview
MKK-DC
B25650
Dry (gas)
SF6, N2
Flat winding
Applications
< 3000 V DC
No AC ripple
Low temperature
DC link traction
State-of-the-art
1800 … 6500 V DC
With AC ripple
Better thermal stability
Filter circuit
800 … 1500 V DC
No AC ripple
Low temperature
DC link industrial
Best cost
MKK-DCI / MKK-DCI-H
B25750
Oil
Rapeseed oil
Flat winding
MKK-DC-R
B25640
Dry
Polyurethane resin
Flat winding
Specification and electrical characteristics
Capacitance
Tolerance
Rated voltage
Operating hot-spot temperature
Lifetime at V
R
and +70 °C hot-spot temperature
Stray inductance
Impregnation
Test voltage between terminals
Test voltage between shorten-terminals and case
100 … 20 000 μF
± 10%
800 … 6500 V DC
–55 … +85 °C
Up to 350 000 h
Minimum values of down to 30 nH
Resin, gas and oil available
1.5
•
V
R
during 10 s
(2
•
V
R
+ 1000) V
RMS
at 50 Hz during 60 s
© EPCOS AG 2011
Power Capacitors
MKK-DC/MKK-DCI/MKK-DCI-H:
Mechanical considerations and construction
General description
The MKK-DC/MKK-DCI/MKK-DCI-H capacitors are
designed in rectangular cases made of austenitic
stainless steel. The cases are hermetically welded
and the surface is not painted. Fixing brackets and
bolts are mounted to fix the capacitor. Bolts are used
also for the ground connection.
Different types of terminals are available for the
terminal connections.
The capacitors should be exclusively handled by the
fixing brackets. In no case the terminals should be
used to lift the capacitor.
Capacitors will usually be mounted upright (terminals
on top), but can be mounted in any position keeping
a distance of 25 mm minimum between large facets,
to allow for thermal expansion and effective cooling.
Standard design
Dimensions
The following table shows the available standard
dimensions. Deviations from these dimensions are
available upon request.
Tolerances are indicated in the drawings as well as the
maximum thermal expansions during normal operation
conditions.
The label is located centered to the length and 50 mm
from the top of the case.
Labeling: manufacturer (company logo), ordering code,
connection diagram, version, rated capacitance,
tolerance, weight, insulating voltage, IEC standard,
country of origin, month/year of manufacturing.
H1
mm
340
340
340
H2
mm
605
605
605
H3
mm
805
MKK-DC
MKK-DCI
MKK-DCI-H
Terminals and connections
Standard terminals are available as shown below.
Brass bolts, tinned, with different metrics in male and
possibility of female connection, are available upon
request.
Insulation material of the terminal is Epoxy according to
CTI 600.
The following table shows the maximum continuous
currents acceptable (for a temperature increase in the
terminals of +15 °C), the maximum torque and the
contact surface of standard terminals.
Other specific options are available upon request.
Please contact our local sales office
.
Terminal M16
Max. current
Max. torque
Contact surface
265 A
25 Nm
505 mm
2
© EPCOS AG 2011
Power Capacitors
Standard terminals
Fixing brackets
The standard fixing brackets of the cases are shown
in the drawing below. For heights lower than 500 mm,
the lower brackets are removed.
Upon request it is possible to substitute the fixing
brackets by bolts (only for heights lower than 500
mm).
Other specific options are available upon request.
Please contact our local sales office.
Z connection can be offered.
It is supplied unmounted.
© EPCOS AG 2011
Power Capacitors
MKK-DC-R:
Mechanical considerations and construction
General description
The MKK-DC-R capacitors are designed in aluminum
rectangular cases filled with resin.
Fixing brackets are available as shown below. For any
other options, please contact our local sales office.
The standard connection terminals are shown in the
drawing below. Otherwise brass bolts tinned with
male and possibility of female connection are
available upon request.
The capacitors should be exclusively handled by
fixing brackets. In no case, the terminals should be
used to lift the capacitor.
Capacitors will usually be mounted upright (terminals
on top), but can be mounted in any position keeping
a lateral space of 25 mm minimum.
Dimensions
The table below shows the L dimension options and
their relation to maximum current and number of
terminal recommendable for low inductance option
(inductance < 50 nH). Other dimensions are available
on request.
Tolerances are indicated in the drawing.
Position of terminals (dimensions A and B) are
changeable according to custom needs.
L1
mm
340
L2
mm
510
I
eff (max)
A
210
270
350
L3
mm
750
MKK-DC-R
Inductance < 50 nH
L1
L2
L3
Number of
terminals
6
8
10
© EPCOS AG 2011
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