Metallized Polypropylene
Capacitors for AC Applications
Short Form Catalog 1999
http://www.siemens.com/pr/index.htm
Designing the Future
Sustained growth, dynamic demand and the highest quality
standards are just as typical of film capacitors as they are of
microelectronics products. Our aim is to supply only
products and services of excellence that meet the demands
of discerning customers.
The following pages present world-class AC polypropylene
capacitors from Siemens Matsushita Components. These
capacitors are produced by EHC in Nashik, India.
Our wide range of AC capacitors extends from 250 to
600 Vac rated voltage and from 0,8 to 120
µF
capacitance.
In additon we manufacture a large choice of custom
designs for special requirements. We can also deliver a
large selection of metallized film from our Film Metallizing
Division. Simply contact us for more details.
Innovation in all fields
We develop and manufacture film capacitors for a whole
spectrum of applications, from
- DC capacitors for information technology, tele-
communications, consumer and automotive electronics to
- AC capacitors for line frequency applications like motor-
run, lighting and power factor correction of small loads.
Whatever the application, our film capacitors are
distinguished by economy of operation and outstanding
price/performance.
Research and development
All our film capacitors are backed by competence in
research and development that is second to none. We are
the only manufacturer worldwide to master both
conventional winding and stacked-film technologies in
volume production of film capacitors. Especially in the field
of AC capacitors we benefit from our experience in film
metallization, with the competence to develop and improve
our products from the very beginning.
World-class quality
We know what quality means to our customers. Endurance
tests on new materials, innovative technologies, advanced
processes and special applications are taken for granted at
the Film Capacitor Division.
Beyond this, we do everything to ensure maximum customer
satisfaction. Certification to ISO 9001, the Siemens
top
campaign and a total quality management (TQM) system
based on these are integral parts of our quality assurance
programs. We are committed to training and continuing
education of our employees. Their keen awareness of
quality is key to maximum customer benefits.
Economy and ecology in harmony
Our production processes are geared to flexibility and
perfection, our logistics to short and fast supply routes. But
environmental protection is paramount.
We eliminate harmful substances right from the product and
package design stage, while our low-emission, energy-
saving manufacturing processes comply with the strictest
environmental standards.
Electronic Hi-Tech Components (EHC) in Nashik, India
Siemens Matsushita Components
1
General Technical Information
1
Introduction
1.1 Basic construction
The MPP (Metallized
PolyPropylene
Film) consists of two
sheets of metallized polypropylene film, each with a thin
layer of vacuum deposited metal on one side. The edge of
each electrode is bonded by a metal endspray. The
endspray serves as the connection surface for one end of
each tab.
Simple connection
The rapid expansion of the plasma in the breakdown
channel causes it to cool after a few microseconds, thus
quenching the discharge. The insulated region thus
resulting around the former faulty area will cause the
capacitor to regain its full operation ability.
3
32
1
1
2
2
KMK0468-B
1 Metallized layer
2 Insulated area
1
4
3
KMK0466-U
3 Faulty area
2
1 Polypropylene film
2 Metallized layer
3 End spray
4 Free margin
Characteristics
Equivalent circuit diagram
C
R
L
S
R
S
R
P
KMK0469-J
1.2 Metallized film capacitors
Capacitors with polypropylene metallized film have a
decisive advantage over capacitors with metal foil
electrodes: they have self-healing properties.
These self-healing properties permit utilization of the full
dielectric strength of the dielectric materials of metallized
film capacitors, allowing the reduction of the size and the
weight of capacitors.
1.3 Self-healing properties
The metal coatings, which are vacuum-deposited directly
onto the plastic film, have a thickness of only 20 ... 50 nm. If
the dielectric breakdown field strength is exceeded locally
at weak points, at pores or impurities in the dielectric, a
dielectric breakdown occurs. The energy released by the
arc discharge in the breakdown channel is sufficient to
totally evaporate the thin metal coating in the vicinity of the
channel.
L
S
Series inductance
R
S
Series resistance
R
p
Parallel resistance
C
R
Rated capacitance
2.1 Rated capacitance
The rated capacitance
C
R
of a capacitor is the value which
is indicated upon it.
The capacitance is measured under standard conditions:
– Temperature range
+ 15 ... + 35 °C (20 °C reference)
– Frequency
60 ... 120 Hz
Variation of capacitance with temperature
∆
C/C
4
%
2
0
KMK0470-M
_
2
_
4
_
40
_
20
0
20
40
60
80
C 100
t
2
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2.2 Dissipation factor
The dissipation factor tan
δ
is the ratio of the equivalent
series resistance to the capacitive reactance in the
equivalent series circuit, or of effective power (power
dissipation) to reactive power for sine-wave loads.
Dissipation factor is indicated by the tangent of the loss
angle and measured at 120 Hz.
Variation of dissipation factor with temperature
0,01
KMK0471-V
3
Climatic stress
3.1 Upper and lower category temperature
In the respective generic specification, the upper category
temperature
T
max
and the lower category temperature
T
min
are defined as the maximum and the minimum ambient
temperature for which a capacitor has been designed to
operate continuously.
3.2 Basic
The climatic category is identified by three groups of
figures, separated by slashes, as specified in IEC 60068-1,
Appendix A.
Example:
– 25 °C
+ 85 °C
21 days
25/085/21
tan
δ
0,0075
0,005
0,0025
0
0
20
40
60
80
100
C 120
t
1st group of figures:
Absolute value of the lower category temperature
T
min
as
test temperature for test Aa (cold) in accordance with
IEC 60068-2-1
2nd group of figures:
Upper category temperature
T
max
as test temperature for
test Ba (dry heat) in accordance with IEC 60068-2-2.
Duration of test: 16 h
3rd group of figures:
Number of days, duration of test Ca (damp heat, steady
state) in accordance with IEC 60068-2-3 at (93 + 2/– 3) %
rel. humidity and 40 °C ambient temperature.
4
Mechanical characteristics
2.3 Insulation resistance
The insulation values for the individual components referred
to rated capacitance are stated as a self-discharge time
constant
τ
in seconds. Minimum values are expressed
according to the formula:
τ
=
(
R
is
⋅
C
R
) (
seconds = MΩ
⋅ µF )
Variation of insulation resistance with temperature
τ
1000
s
100
KMK0472-4
4.1 Mechanical robustness of terminals (only for wire
terminals)
Half of terminals are subjected to a 20N load and bent
consecutively twice. The other half of terminals, with the
same load, are rotated 180°.
4.2 Fixing
Capacitors provided with fixing threaded bolts have 5 Nm
as max. admissible torque for M8 bolts and 12 Nm for M 12
bolts.
4.3 Resistance to vibration
The capacitor‘s ability to withstand vibration, e.g. as occurs
in applications involving rotating machinery, is tested in
accordance with IEC 6068-2-6 under the following test
conditions:
– Frequency range
10 Hz ... 55 Hz
– Test duration
6h
– Amplitude of displacement
0.74 mm
– Amplitude of acceleration
98 m/s
2
(= 10
g
)
10
_
40
_
20
0
20
40
60
80
C 100
T
2.4 Self-inductance
The self-inductance is produced by the inductance of the
terminals and element. Due to the kind of contacting in self-
healing capacitors (large-area metal endspraying covering
all windings), the self-inductance is particularly low.
3
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5
Capacitor markings
6
Quality assurance
The following information are marked on the capacitor:
– Siemens Matsushita Components (logo)
– Rated capacitance
C
R
in microfarads and tolerance as a
percentage
– Rated voltage
U
R
(in V)
– Rated frequency
f
R
(in Hz)
– Climatic category e.g. -25/85/21
– Week code
Self-healing
or “SH”
–
Discharge resistor (where applicable)
s
The quality assurance system for capacitors is based on
quality directives that are binding throughout the
company. It is defined in a quality manual and allows for
−
national and international standards,
e.g. ISO 9001 (applied for)
−
specifications harmonized with customers
−
Siemens Matsushita own performance targets.
s
The entire course of production – from procurement to
manufacturing process and final inspection – is
accompanied by quality assurance measures. Routine
tests are performed on every capacitor, from winding to
final inspection.
s
Type tests are performed quarterly on representative
samples of each capacitor series.
7
General technical data
25/085/21
– 25 °C
+ 85 °C
21 days / 40 °C / 95 % relative humidity
Capacitance change
∆C/C ≤
5 %
Dissipation factor change
∆
tan
δ ≤
1.5
.
10
–3
(at 120 Hz)
1.1
U
R
1.3
I
R
50 ... 60 Hz
10 V/µs
1.5
U
R
(2 s)
2000 Vac (10 s)
1.0
.
10
–3
at 120 Hz
3000 s
Climatic category in accordance with IEC 60068-1
Lower category temperature
T
min
Upper category temperature
T
max
Damp heat test
Limit values after damp heat test
Maximum permissible voltage (according to IEC 60252)
Maximum permissible current (according to IEC 60252)
Rated frequency
Maximum rate of voltage rise (du/dt)
AC test voltage
(terminal/terminal)
(terminal joined together/case)
Dissipation factor tan
δ
at 20 °C
Time constant
τ
=
R
is .
C
R
at 20 °C, rel. humidity
≤
65 % (minimum value)
Symbols and terms
C
R
Rated capacitance (µF)
U
R
Rated voltage (Vac)
d
u
/d
t
Rate of voltage rise (V/µs)
f
Frequency (Hz)
d
(mm)
l
(mm)
b
(mm)
Outer diameter (mm)
Can/case length (mm)
Wire length (mm)
4
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