EPR
Vishay ESTA
High Voltage DC Capacitors
RIPPLE
The sum of the peak ripple voltage and the DC voltage
should not exceed the rated voltage. Refer to graph fig. 1 for
permissible peak-to-peak ripple voltage as a percentage of
rated voltage for various frequencies.
30
20
%
P
E
10
0
TYPE EPR
The EPR range of capacitors are manufactured using a
mixed dielectric material that consists of polyester
/polypropylene film and capacitor tissue. They are
impregnated and filled with a mineral oil. The container is a
robust rectangular polypropylene case. The internal
construction is designed to prevent movement when the
capacitor is subjected to mechanical shock or vibration. An
inert welding process ensures hermetic sealing. Standard
terminations are M10 threaded inserts which eliminates the
necessity for large voltage terminals. The case has an
extremely low affinity for moisture and is resistant to virtually
all electrical environments. Brackets can be welded on as
required.
10
100
Fig. 1
1000
10 000
FREQUENCY Hz
POWER FACTOR
The power factor is variable, and is a function of temperature
and frequency see fig. 2. Nominal value < 0.5 % at 20 °C
at 20 °C
Power Factor
vs.
Temperature
2 %
1 kHz
1 %
50 Hz
0 %
65 80
- 20
0
40
Note
Fig. 2
•
The impregnant used is a non toxic highly purifiedand inhibited
mineral oil.
DIELECTRIC RESISTANCE
(Parallel resistance) is indicated by the graph of insulance
(MΩ x μF) vs temperature fig. 3. The insulance (MΩ x μF) is
nominally 10 000 s at + 20 °C. (Measurements taken after 1
minute with an applied voltage of 500 V)
APPLICATIONS
The EPR range is designed specifically for DC
applications such as filters:
• By-pass
105
• Coupling
104
• Rapid discharge
• Pulse forming networks
• Radar
103
Insulance vs. Temperature
Typical Values
102
• Laser
- 40
0
40
80
Fig. 3
• X-ray equipment
LIFE EXPECTANCY
TEMPERATURE RANGE
Temperature range is - 40 °C to + 85 °C. Derating is required
for operation at higher temperatures.
EPR type capacitors are designed for a life exceptancy of
50 000 h at 65 °C. To achieve the same life expectancy at
85 °C derate to 60 % of rated voltage fig. 4.
105
TEMPERATURE COEFFICIENT
Capacitance will increase by 2 % per 100 °C temperature
rise.
104
103
CAPACITANCE RANGE
0.002 μF to 2 μF. The tolerance is 10 %. Other tolerance
are available on request. Normal values measured at 1 kHz.
102
50
150 °C
Rated Voltage
100
Fig. 4
Document Number: 13016
Revision: 11-Aug-10
For technical questions, contact: esta@vishay.com
www.vishay.com
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