EPR

www.vishay.com

Vishay ESTA

Revision: 22-Nov-2019

1

Document Number: 13016

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

High Voltage DC Filter Capacitors

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.

Note

• The impregnant used is a non toxic highly purified and inhibited

mineral oil

APPLICATIONS

The EPR range is designed specifically for DC applications

such as filters:

• By-pass

• Coupling

• Rapid discharge

• Pulse forming networks

•Radar

• Laser

• X-ray equipment

TEMPERATURE RANGE

Temperature range is -40 °C to +85 °C. Derating is required

for operation at higher temperatures.

TEMPERATURE COEFFICIENT

Capacitance will increase by 2 % per 100 °C temperature

rise.

CAPACITANCE RANGE

0.002 μF to 2 μF. The tolerance is ± 10 %. Other tolerance

are available on request. Normal values measured at 1 kHz.

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.















Fig. 1

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.













Fig. 2

DIELECTRIC RESISTANCE

(Parallel resistance) is indicated by the graph of insulance

(M

 x μF) vs temperature Fig. 3. The insulance (M x μF) is

nominally 10 000 s at +20 °C. (Measurements taken after

1 minute with an applied voltage of 500 V).













Fig. 3

LIFE EXPECTANCY

EPR type capacitors are designed for a life expectancy of

50 000 h at 65 °C. To achieve the same life expectancy at

85 °C derate to 60 % of rated voltage Fig. 4.















Fig. 4

30

10

20

10

100

1000

Frequency Hz

0

10 000

2 %

0 %

1 %

80

65

40

0

-20

1 kHz

50 Hz

Power Factor

vs.

Temperature

at 20 °C

-40

0

40

80

10

2

10

3

10

4

10

5

Insulance vs. Temperature

Typical Values

50

100

150 °C

10

2

10

3

10

4

10

5

Rated Voltage